This is guile-procedures.txt, produced by makeinfo version 4.13 from
guile-procedures.texi.


 acons

 -- Scheme Procedure: acons key value alist
     Add a new key-value pair to ALIST.  A new pair is
 created whose
     car is KEY and whose cdr is VALUE, and the
 pair is consed onto
     ALIST, and the new list is returned.  This
 function is _not_
     destructive; ALIST is not modified.
   
 sloppy-assq

 -- Scheme Procedure: sloppy-assq key alist
     Behaves like `assq' but does not do any error checking.
     Recommended only for use in Guile internals.
   
 sloppy-assv

 -- Scheme Procedure: sloppy-assv key alist
     Behaves like `assv' but does not do any error checking.
     Recommended only for use in Guile internals.
   
 sloppy-assoc

 -- Scheme Procedure: sloppy-assoc key alist
     Behaves like `assoc' but does not do any error checking.
     Recommended only for use in Guile internals.
   
 assq

 -- Scheme Procedure: assq key alist
 -- Scheme Procedure: assv key alist
 -- Scheme Procedure: assoc key alist
     Fetch the entry in ALIST that is associated with KEY.  To
 decide
     whether the argument KEY matches a particular entry in
 ALIST,
     `assq' compares keys with `eq?', `assv'
 uses `eqv?' and `assoc'
     uses `equal?'.  If KEY
 cannot be found in ALIST (according to
     whichever equality
 predicate is in use), then return `#f'.
     These functions
 return the entire alist entry found (i.e. both
     the key and the value).
   
 assv

 -- Scheme Procedure: assv key alist
     Behaves like `assq' but uses `eqv?' for key comparison.
   
 assoc

 -- Scheme Procedure: assoc key alist
     Behaves like `assq' but uses `equal?' for key comparison.
   
 assq-ref

 -- Scheme Procedure: assq-ref alist key
 -- Scheme Procedure: assv-ref alist key
 -- Scheme Procedure: assoc-ref alist key
     Like `assq', `assv' and `assoc', except that only the
 value
     associated with KEY in ALIST is returned.  These
 functions are
     equivalent to
 
          (let ((ent (ASSOCIATOR KEY ALIST)))
            (and ent (cdr ent)))
     
 where ASSOCIATOR is one of `assq', `assv' or `assoc'.
   
 assv-ref

 -- Scheme Procedure: assv-ref alist key
     Behaves like `assq-ref' but uses `eqv?' for key comparison.
   
 assoc-ref

 -- Scheme Procedure: assoc-ref alist key
     Behaves like `assq-ref' but uses `equal?' for key comparison.
   
 assq-set!

 -- Scheme Procedure: assq-set! alist key val
 -- Scheme Procedure: assv-set! alist key value
 -- Scheme Procedure: assoc-set! alist key value
     Reassociate KEY in ALIST with VALUE: find any existing
 ALIST
     entry for KEY and associate it with the new
 VALUE.  If ALIST
     does not contain an entry for KEY,
 add a new one.  Return the
     (possibly new) alist.
 
 These functions do not attempt to
     verify the structure of ALIST,
 and so may cause unusual results
     if passed an object that is not an
 association list.
   
 assv-set!

 -- Scheme Procedure: assv-set! alist key val
     Behaves like `assq-set!' but uses `eqv?' for key comparison.
   
 assoc-set!

 -- Scheme Procedure: assoc-set! alist key val
     Behaves like `assq-set!' but uses `equal?' for key comparison.
   
 assq-remove!

 -- Scheme Procedure: assq-remove! alist key
 -- Scheme Procedure: assv-remove! alist key
 -- Scheme Procedure: assoc-remove! alist key
     Delete the first entry in ALIST associated with KEY, and return
     the resulting alist.
   
 assv-remove!

 -- Scheme Procedure: assv-remove! alist key
     Behaves like `assq-remove!' but uses `eqv?' for key comparison.
   
 assoc-remove!

 -- Scheme Procedure: assoc-remove! alist key
     Behaves like `assq-remove!' but uses `equal?' for key comparison.
   
 make-arbiter

 -- Scheme Procedure: make-arbiter name
     Return an arbiter object, initially unlocked.  Currently
 NAME is
     only used for diagnostic output.
   
 try-arbiter

 -- Scheme Procedure: try-arbiter arb
     If ARB is unlocked, then lock it and return `#t'.
 If ARB is
     already locked, then do nothing and return
 `#f'.
   
 release-arbiter

 -- Scheme Procedure: release-arbiter arb
     If ARB is locked, then unlock it and return `#t'.
 If ARB is
     already unlocked, then do nothing and return
 `#f'.
 
 Typical
     usage is for the thread which locked an arbiter to
 later release
     it, but that's not required, any thread can
 release it.
   
 async

 -- Scheme Procedure: async thunk
     Create a new async for the procedure THUNK.
   
 async-mark

 -- Scheme Procedure: async-mark a
     Mark the async A for future execution.
   
 run-asyncs

 -- Scheme Procedure: run-asyncs list_of_a
     Execute all thunks from the asyncs of the list LIST_OF_A.
   
 system-async

 -- Scheme Procedure: system-async thunk
     This function is deprecated.  You can use THUNK directly
 instead
     of explicitly creating an async object.
 
   
 system-async-mark

 -- Scheme Procedure: system-async-mark proc [thread]
     Mark PROC (a procedure with zero arguments) for future execution
     in THREAD.  If PROC has already been marked for
 THREAD but has
     not been executed yet, this call has no effect.
 If THREAD is
     omitted, the thread that called
 `system-async-mark' is used.
 
     This procedure is not safe to be called from C signal handlers.
     Use
 `scm_sigaction' or `scm_sigaction_for_thread' to install
     signal handlers.
   
 noop

 -- Scheme Procedure: noop . args
     Do nothing.  When called without arguments, return `#f',
     otherwise return the first argument.
   
 unmask-signals

 -- Scheme Procedure: unmask-signals
     Unmask signals. The returned value is not specified.
   
 mask-signals

 -- Scheme Procedure: mask-signals
     Mask signals. The returned value is not specified.
   
 call-with-blocked-asyncs

 -- Scheme Procedure: call-with-blocked-asyncs proc
     Call PROC with no arguments and block the execution
 of system
     asyncs by one level for the current thread while
 it is running.
     Return the value returned by PROC.
 
   
 call-with-unblocked-asyncs

 -- Scheme Procedure: call-with-unblocked-asyncs proc
     Call PROC with no arguments and unblock the execution
 of system
     asyncs by one level for the current thread while
 it is running.
     Return the value returned by PROC.
 
   
 display-error

 -- Scheme Procedure: display-error stack port subr message args rest
     Display an error message to the output port PORT.
 STACK is the
     saved stack for the error, SUBR is
 the name of the procedure in
     which the error occurred and
 MESSAGE is the actual error
     message, which may contain
 formatting instructions. These will
     format the arguments in
 the list ARGS accordingly.  REST is
     currently
 ignored.
   
 display-application

 -- Scheme Procedure: display-application frame [port [indent]]
     Display a procedure application FRAME to the output port
 PORT.
     INDENT specifies the indentation of the
 output.
   
 display-backtrace

 -- Scheme Procedure: display-backtrace stack port [first [depth
          [highlights]]]
     Display a backtrace to the output port PORT. STACK
 is the stack
     to take the backtrace from, FIRST specifies
 where in the stack
     to start and DEPTH how much frames
 to display. Both FIRST and
     DEPTH can be `#f',
 which means that default values will be
     used.
 When HIGHLIGHTS is given,
 it should be a list and all
     members of it are highligthed in
 the backtrace.
   
 backtrace

 -- Scheme Procedure: backtrace [highlights]
     Display a backtrace of the stack saved by the last error
 to the
     current output port.  When HIGHLIGHTS is given,
 it should be a
     list and all members of it are highligthed in
 the backtrace.
   
 not

 -- Scheme Procedure: not x
     Return `#t' iff X is `#f', else return `#f'.
   
 boolean?

 -- Scheme Procedure: boolean? obj
     Return `#t' iff OBJ is either `#t' or `#f'.
   
 char?

 -- Scheme Procedure: char? x
     Return `#t' iff X is a character, else `#f'.
   
 char=?

 -- Scheme Procedure: char=? x y
     Return `#t' iff X is the same character as Y, else `#f'.
   
 char<?

 -- Scheme Procedure: char<? x y
     Return `#t' iff X is less than Y in the ASCII sequence,
 else
     `#f'.
   
 char<=?

 -- Scheme Procedure: char<=? x y
     Return `#t' iff X is less than or equal to Y in the
 ASCII
     sequence, else `#f'.
   
 char>?

 -- Scheme Procedure: char>? x y
     Return `#t' iff X is greater than Y in the ASCII
 sequence, else
     `#f'.
   
 char>=?

 -- Scheme Procedure: char>=? x y
     Return `#t' iff X is greater than or equal to Y in the
 ASCII
     sequence, else `#f'.
   
 char-ci=?

 -- Scheme Procedure: char-ci=? x y
     Return `#t' iff X is the same character as Y ignoring
 case, else
     `#f'.
   
 char-ci<?

 -- Scheme Procedure: char-ci<? x y
     Return `#t' iff X is less than Y in the ASCII sequence
 ignoring
     case, else `#f'.
   
 char-ci<=?

 -- Scheme Procedure: char-ci<=? x y
     Return `#t' iff X is less than or equal to Y in the
 ASCII
     sequence ignoring case, else `#f'.
   
 char-ci>?

 -- Scheme Procedure: char-ci>? x y
     Return `#t' iff X is greater than Y in the ASCII
 sequence
     ignoring case, else `#f'.
   
 char-ci>=?

 -- Scheme Procedure: char-ci>=? x y
     Return `#t' iff X is greater than or equal to Y in the
 ASCII
     sequence ignoring case, else `#f'.
   
 char-alphabetic?

 -- Scheme Procedure: char-alphabetic? chr
     Return `#t' iff CHR is alphabetic, else `#f'.
 
   
 char-numeric?

 -- Scheme Procedure: char-numeric? chr
     Return `#t' iff CHR is numeric, else `#f'.
 
   
 char-whitespace?

 -- Scheme Procedure: char-whitespace? chr
     Return `#t' iff CHR is whitespace, else `#f'.
 
   
 char-upper-case?

 -- Scheme Procedure: char-upper-case? chr
     Return `#t' iff CHR is uppercase, else `#f'.
 
   
 char-lower-case?

 -- Scheme Procedure: char-lower-case? chr
     Return `#t' iff CHR is lowercase, else `#f'.
 
   
 char-is-both?

 -- Scheme Procedure: char-is-both? chr
     Return `#t' iff CHR is either uppercase or lowercase, else `#f'.
     
   
 char->integer

 -- Scheme Procedure: char->integer chr
     Return the number corresponding to ordinal position of CHR in the
     ASCII sequence.
   
 integer->char

 -- Scheme Procedure: integer->char n
     Return the character at position N in the ASCII sequence.
   
 char-upcase

 -- Scheme Procedure: char-upcase chr
     Return the uppercase character version of CHR.
   
 char-downcase

 -- Scheme Procedure: char-downcase chr
     Return the lowercase character version of CHR.
   
 with-continuation-barrier

 -- Scheme Procedure: with-continuation-barrier proc
     Call PROC and return its result.  Do not allow the invocation of
     continuations that would leave or enter the dynamic extent of the
     call
 to `with-continuation-barrier'.  Such an attempt causes an
     error
 to be signaled.
 
 Throws (such as errors) that are not
     caught from within PROC are
 caught by
     `with-continuation-barrier'.  In that case, a short
 message is
     printed to the current error port and `#f' is returned.
 
 Thus,
     `with-continuation-barrier' returns exactly once.
 
   
 debug-options-interface

 -- Scheme Procedure: debug-options-interface [setting]
     Option interface for the debug options. Instead of using
 this
     procedure directly, use the procedures `debug-enable',
     `debug-disable', `debug-set!' and `debug-options'.
   
 with-traps

 -- Scheme Procedure: with-traps thunk
     Call THUNK with traps enabled.
   
 memoized?

 -- Scheme Procedure: memoized? obj
     Return `#t' if OBJ is memoized.
   
 unmemoize-expr

 -- Scheme Procedure: unmemoize-expr m
     Unmemoize the memoized expression M,
   
 memoized-environment

 -- Scheme Procedure: memoized-environment m
     Return the environment of the memoized expression M.
   
 procedure-name

 -- Scheme Procedure: procedure-name proc
     Return the name of the procedure PROC
   
 procedure-source

 -- Scheme Procedure: procedure-source proc
     Return the source of the procedure PROC.
   
 procedure-environment

 -- Scheme Procedure: procedure-environment proc
     Return the environment of the procedure PROC.
   
 local-eval

 -- Scheme Procedure: local-eval exp [env]
     Evaluate EXP in its environment.  If ENV is supplied,
 it is the
     environment in which to evaluate EXP.  Otherwise,
 EXP must be a
     memoized code object (in which case, its environment
 is
     implicit).
   
 debug-object?

 -- Scheme Procedure: debug-object? obj
     Return `#t' if OBJ is a debug object.
   
 issue-deprecation-warning

 -- Scheme Procedure: issue-deprecation-warning . msgs
     Output MSGS to `(current-error-port)' when this is the first call
     to `issue-deprecation-warning' with this specific MSGS.  Do
     nothing otherwise. The argument MSGS should be a list of strings;
     they are printed in turn, each one followed by a newline.
   
 include-deprecated-features

 -- Scheme Procedure: include-deprecated-features
     Return `#t' iff deprecated features should be included in public
     interfaces.
   
 substring-move-left!

 -- Scheme Procedure: substring-move-left!
     implemented by the C function "scm_substring_move_x"
   
 substring-move-right!

 -- Scheme Procedure: substring-move-right!
     implemented by the C function "scm_substring_move_x"
   
 c-registered-modules

 -- Scheme Procedure: c-registered-modules
     Return a list of the object code modules that have been imported
     into
 the current Guile process.  Each element of the list is a
     pair whose
 car is the name of the module, and whose cdr is the
     function handle
 for that module's initializer function.  The
     name is the string that
 has been passed to
     scm_register_module_xxx.
   
 c-clear-registered-modules

 -- Scheme Procedure: c-clear-registered-modules
     Destroy the list of modules registered with the current Guile
     process.
 The return value is unspecified.  *Warning:* this
     function does
 not actually unlink or deallocate these modules,
     but only destroys the
 records of which modules have been loaded.
     It should therefore be used
 only by module bookkeeping
     operations.
   
 close-all-ports-except

 -- Scheme Procedure: close-all-ports-except . ports
     [DEPRECATED] Close all open file ports used by the interpreter
     except for those supplied as arguments.  This procedure
 was
     intended to be used before an exec call to close file descriptors
     which are not needed in the new process.  However it has the
     undesirable side effect of flushing buffers, so it's deprecated.
     Use port-for-each instead.
   
 variable-set-name-hint!

 -- Scheme Procedure: variable-set-name-hint! var hint
     Do not use this function.
   
 builtin-variable

 -- Scheme Procedure: builtin-variable name
     Do not use this function.
   
 sloppy-memq

 -- Scheme Procedure: sloppy-memq x lst
     This procedure behaves like `memq', but does no type or error
     checking.
 Its use is recommended only in writing Guile
     internals,
 not for high-level Scheme programs.
   
 sloppy-memv

 -- Scheme Procedure: sloppy-memv x lst
     This procedure behaves like `memv', but does no type or error
     checking.
 Its use is recommended only in writing Guile
     internals,
 not for high-level Scheme programs.
   
 sloppy-member

 -- Scheme Procedure: sloppy-member x lst
     This procedure behaves like `member', but does no type or error
     checking.
 Its use is recommended only in writing Guile
     internals,
 not for high-level Scheme programs.
   
 read-and-eval!

 -- Scheme Procedure: read-and-eval! [port]
     Read a form from PORT (standard input by default), and evaluate
     it
 (memoizing it in the process) in the top-level environment.
     If no data
 is left to be read from PORT, an `end-of-file' error
     is
 signalled.
   
 string->obarray-symbol

 -- Scheme Procedure: string->obarray-symbol o s [softp]
     Intern a new symbol in OBARRAY, a symbol table, with name
     STRING.
 
 If OBARRAY is `#f', use the default system symbol
     table.  If
 OBARRAY is `#t', the symbol should not be interned in
     any
 symbol table; merely return the pair (SYMBOL
 .
     #<UNDEFINED>).
 
 The SOFT? argument determines whether new
     symbol table entries
 should be created when the specified symbol
     is not already present in
 OBARRAY.  If SOFT? is specified and is
     a true value, then
 new entries should not be added for symbols
     not already present in the
 table; instead, simply return `#f'.
   
 intern-symbol

 -- Scheme Procedure: intern-symbol o s
     Add a new symbol to OBARRAY with name STRING, bound to an
     unspecified initial value.  The symbol table is not modified if a
     symbol
 with this name is already present.
   
 unintern-symbol

 -- Scheme Procedure: unintern-symbol o s
     Remove the symbol with name STRING from OBARRAY.  This
 function
     returns `#t' if the symbol was present and `#f'
 otherwise.
   
 symbol-binding

 -- Scheme Procedure: symbol-binding o s
     Look up in OBARRAY the symbol whose name is STRING, and
 return
     the value to which it is bound.  If OBARRAY is `#f',
 use the
     global symbol table.  If STRING is not interned in
 OBARRAY, an
     error is signalled.
   
 symbol-bound?

 -- Scheme Procedure: symbol-bound? o s
     Return `#t' if OBARRAY contains a symbol with name
 STRING bound
     to a defined value.  This differs from
 SYMBOL-INTERNED? in that
     the mere mention of a symbol
 usually causes it to be interned;
     `symbol-bound?'
 determines whether a symbol has been given any
     meaningful
 value.
   
 symbol-set!

 -- Scheme Procedure: symbol-set! o s v
     Find the symbol in OBARRAY whose name is STRING, and rebind
 it
     to VALUE.  An error is signalled if STRING is not present
 in
     OBARRAY.
   
 gentemp

 -- Scheme Procedure: gentemp [prefix [obarray]]
     Create a new symbol with a name unique in an obarray.
 The name
     is constructed from an optional string PREFIX
 and a counter
     value.  The default prefix is `t'.  The
 OBARRAY is specified as
     a second optional argument.
 Default is the system obarray where
     all normal symbols are
 interned.  The counter is increased by 1
     at each
 call.  There is no provision for resetting the counter.
   
 guardian-destroyed?

 -- Scheme Procedure: guardian-destroyed? guardian
     Return `#t' if GUARDIAN has been destroyed, otherwise `#f'.
   
 guardian-greedy?

 -- Scheme Procedure: guardian-greedy? guardian
     Return `#t' if GUARDIAN is a greedy guardian, otherwise `#f'.
   
 destroy-guardian!

 -- Scheme Procedure: destroy-guardian! guardian
     Destroys GUARDIAN, by making it impossible to put any more
     objects in it or get any objects from it.  It also unguards any
     objects guarded by GUARDIAN.
   
 make-keyword-from-dash-symbol

 -- Scheme Procedure: make-keyword-from-dash-symbol symbol
     Make a keyword object from a SYMBOL that starts with a dash.
   
 keyword-dash-symbol

 -- Scheme Procedure: keyword-dash-symbol keyword
     Return the dash symbol for KEYWORD.
 This is the inverse of
     `make-keyword-from-dash-symbol'.
   
 dynamic-link

 -- Scheme Procedure: dynamic-link filename
     Find the shared object (shared library) denoted by
 FILENAME and
     link it into the running Guile
 application.  The returned
     scheme object is a "handle" for the library which can
 be passed
     to `dynamic-func', `dynamic-call' etc.
 
 Searching for object
     files is system dependent.  Normally,
 if FILENAME does have an
     explicit directory it will
 be searched for in locations
 such
     as `/usr/lib' and `/usr/local/lib'.
   
 dynamic-object?

 -- Scheme Procedure: dynamic-object? obj
     Return `#t' if OBJ is a dynamic object handle,
 or `#f'
     otherwise.
   
 dynamic-unlink

 -- Scheme Procedure: dynamic-unlink dobj
     Unlink a dynamic object from the application, if possible.  The
     object must have been linked by `dynamic-link', with 
 DOBJ the
     corresponding handle.  After this procedure
 is called, the
     handle can no longer be used to access the
 object.
   
 dynamic-func

 -- Scheme Procedure: dynamic-func name dobj
     Return a "handle" for the function NAME in the
 shared object
     referred to by DOBJ.  The handle
 can be passed to `dynamic-call'
     to actually
 call the function.
 
 Regardless whether your C
     compiler prepends an underscore
 `_' to the global names in a
     program, you should
 *not* include this underscore in NAME
     since it will be added automatically when necessary.
   
 dynamic-call

 -- Scheme Procedure: dynamic-call func dobj
     Call a C function in a dynamic object.  Two styles of
 invocation
     are supported:
 
        * FUNC can be a function handle returned by
 `dynamic-func'.
          In this case DOBJ is
 ignored

        * FUNC can be a string with the name of the
 function to call,
          with DOBJ the handle of the
 dynamic object in which to find
          the function.
 This is equivalent to
               
               (dynamic-call (dynamic-func FUNC DOBJ) #f)
     
 In either case, the function is passed no arguments
 and its
     return value is ignored.
   
 dynamic-args-call

 -- Scheme Procedure: dynamic-args-call func dobj args
     Call the C function indicated by FUNC and DOBJ,
 just like
     `dynamic-call', but pass it some arguments and
 return its return
     value.  The C function is expected to take
 two arguments and
     return an `int', just like `main':
          int c_func (int argc, char **argv);
     
 The parameter ARGS must be a list of strings and is
 converted
     into an array of `char *'.  The array is passed
 in ARGV and its
     size in ARGC.  The return value is
 converted to a Scheme number
     and returned from the call to
 `dynamic-args-call'.
   
 dynamic-wind

 -- Scheme Procedure: dynamic-wind in_guard thunk out_guard
     All three arguments must be 0-argument procedures.
 IN_GUARD is
     called, then THUNK, then
 OUT_GUARD.
 
 If, any time during the
     execution of THUNK, the
 continuation of the `dynamic_wind'
     expression is escaped
 non-locally, OUT_GUARD is called.  If the
     continuation of
 the dynamic-wind is re-entered, IN_GUARD is
     called.  Thus
 IN_GUARD and OUT_GUARD may be called any number
     of
 times.
          (define x 'normal-binding)
          => x
          (define a-cont  (call-with-current-continuation
          		  (lambda (escape)
          		     (let ((old-x x))
          		       (dynamic-wind
          			  ;; in-guard:
          			  ;;
          			  (lambda () (set! x 'special-binding))
          
          			  ;; thunk
          			  ;;
          		 	  (lambda () (display x) (newline)
          				     (call-with-current-continuation escape)
          				     (display x) (newline)
          				     x)
          
          			  ;; out-guard:
          			  ;;
          			  (lambda () (set! x old-x)))))))
          
          ;; Prints:
          special-binding
          ;; Evaluates to:
          => a-cont
          x
          => normal-binding
          (a-cont #f)
          ;; Prints:
          special-binding
          ;; Evaluates to:
          => a-cont  ;; the value of the (define a-cont...)
          x
          => normal-binding
          a-cont
          => special-binding

 environment?

 -- Scheme Procedure: environment? obj
     Return `#t' if OBJ is an environment, or `#f'
 otherwise.
   
 environment-bound?

 -- Scheme Procedure: environment-bound? env sym
     Return `#t' if SYM is bound in ENV, or
 `#f' otherwise.
   
 environment-ref

 -- Scheme Procedure: environment-ref env sym
     Return the value of the location bound to SYM in
 ENV. If SYM is
     unbound in ENV, signal an
 `environment:unbound' error.
   
 environment-fold

 -- Scheme Procedure: environment-fold env proc init
     Iterate over all the bindings in ENV, accumulating some
 value.
     For each binding in ENV, apply PROC to the symbol
 bound, its
     value, and the result from the previous application
 of PROC.
     Use INIT as PROC's third argument the first time
 PROC is
     applied.
 If ENV contains no bindings, this function simply
     returns
 INIT.
 If ENV binds the symbol sym1 to the value val1,
     sym2 to
 val2, and so on, then this procedure computes:
            (proc sym1 val1
                  (proc sym2 val2
                        ...
                        (proc symn valn
                              init)))
     Each binding in ENV will be processed exactly once.
     `environment-fold' makes no guarantees about the order in
 which
     the bindings are processed.
 Here is a function which, given an
     environment, constructs an
 association list representing that
     environment's bindings,
 using environment-fold:
            (define (environment->alist env)
              (environment-fold env
                                (lambda (sym val tail)
                                  (cons (cons sym val) tail))
                                '()))

 environment-define

 -- Scheme Procedure: environment-define env sym val
     Bind SYM to a new location containing VAL in
 ENV. If SYM is
     already bound to another location
 in ENV and the binding is
     mutable, that binding is
 replaced.  The new binding and location
     are both mutable. The
 return value is unspecified.
 If SYM is
     already bound in ENV, and the binding is
 immutable, signal an
     `environment:immutable-binding' error.
   
 environment-undefine

 -- Scheme Procedure: environment-undefine env sym
     Remove any binding for SYM from ENV. If SYM
 is unbound in ENV,
     do nothing.  The return value is
 unspecified.
 If SYM is
     already bound in ENV, and the binding is
 immutable, signal an
     `environment:immutable-binding' error.
   
 environment-set!

 -- Scheme Procedure: environment-set! env sym val
     If ENV binds SYM to some location, change that
 location's value
     to VAL.  The return value is
 unspecified.
 If SYM is not bound
     in ENV, signal an
 `environment:unbound' error.  If ENV binds
     SYM
 to an immutable location, signal an
     `environment:immutable-location' error.
   
 environment-cell

 -- Scheme Procedure: environment-cell env sym for_write
     Return the value cell which ENV binds to SYM, or
 `#f' if the
     binding does not live in a value cell.
 The argument FOR-WRITE
     indicates whether the caller
 intends to modify the variable's
     value by mutating the value
 cell.  If the variable is immutable,
     then
 `environment-cell' signals an
     `environment:immutable-location' error.
 If SYM is unbound in
     ENV, signal an
 `environment:unbound' error.
 If you use this
     function, you should consider using
 `environment-observe', to be
     notified when SYM gets
 re-bound to a new value cell, or becomes
     undefined.
   
 environment-observe

 -- Scheme Procedure: environment-observe env proc
     Whenever ENV's bindings change, apply PROC to
 ENV.
 This
     function returns an object, token, which you can pass to
     `environment-unobserve' to remove PROC from the set
 of
     procedures observing ENV.  The type and value of
 token is
     unspecified.
   
 environment-observe-weak

 -- Scheme Procedure: environment-observe-weak env proc
     This function is the same as environment-observe, except that
     the reference ENV retains to PROC is a weak
 reference. This
     means that, if there are no other live,
 non-weak references to
     PROC, it will be
 garbage-collected, and dropped from ENV's
     list of observing procedures.
   
 environment-unobserve

 -- Scheme Procedure: environment-unobserve token
     Cancel the observation request which returned the value
 TOKEN.
     The return value is unspecified.
 If a call `(environment-observe
     env proc)' returns
 TOKEN, then the call `(environment-unobserve
     token)'
 will cause PROC to no longer be called when ENV's
     bindings change.
   
 make-leaf-environment

 -- Scheme Procedure: make-leaf-environment
     Create a new leaf environment, containing no bindings.
 All
     bindings and locations created in the new environment
 will be
     mutable.
   
 leaf-environment?

 -- Scheme Procedure: leaf-environment? object
     Return `#t' if object is a leaf environment, or `#f'
 otherwise.
   
 make-eval-environment

 -- Scheme Procedure: make-eval-environment local imported
     Return a new environment object eval whose bindings are the
     union of the bindings in the environments LOCAL and
 IMPORTED,
     with bindings from LOCAL taking
 precedence. Definitions made in
     eval are placed in LOCAL.
 Applying `environment-define' or
     `environment-undefine' to eval has the same effect as
 applying
     the procedure to LOCAL.
 Note that eval incorporates LOCAL and
     IMPORTED by
 reference:
 If, after creating eval, the program
     changes the bindings of
 LOCAL or IMPORTED, those changes will be
     visible
 in eval.
 Since most Scheme evaluation takes place in
     eval environments,
 they transparently cache the bindings
     received from LOCAL
 and IMPORTED. Thus, the first time the
     program looks up
 a symbol in eval, eval may make calls to LOCAL
     or
 IMPORTED to find their bindings, but subsequent
 references
     to that symbol will be as fast as references to
 bindings in
     finite environments.
 In typical use, LOCAL will be a finite
     environment, and
 IMPORTED will be an import environment
   
 eval-environment?

 -- Scheme Procedure: eval-environment? object
     Return `#t' if object is an eval environment, or `#f'
     otherwise.
   
 eval-environment-local

 -- Scheme Procedure: eval-environment-local env
     Return the local environment of eval environment ENV.
   
 eval-environment-set-local!

 -- Scheme Procedure: eval-environment-set-local! env local
     Change ENV's local environment to LOCAL.
   
 eval-environment-imported

 -- Scheme Procedure: eval-environment-imported env
     Return the imported environment of eval environment ENV.
   
 eval-environment-set-imported!

 -- Scheme Procedure: eval-environment-set-imported! env imported
     Change ENV's imported environment to IMPORTED.
   
 make-import-environment

 -- Scheme Procedure: make-import-environment imports conflict_proc
     Return a new environment IMP whose bindings are the union
 of the
     bindings from the environments in IMPORTS;
 IMPORTS must be a
     list of environments. That is,
 IMP binds a symbol to a location
     when some element of
 IMPORTS does.
 If two different elements
     of IMPORTS have a binding for
 the same symbol, the CONFLICT-PROC
     is called with the
 following parameters:  the import
     environment, the symbol and
 the list of the imported
     environments that bind the symbol.
 If the CONFLICT-PROC returns
     an environment ENV,
 the conflict is considered as resolved and
     the binding from
 ENV is used.  If the CONFLICT-PROC returns
     some
 non-environment object, the conflict is considered
     unresolved
 and the symbol is treated as unspecified in the
     import
 environment.
 The checking for conflicts may be
     performed lazily, i. e. at
 the moment when a value or binding
     for a certain symbol is
 requested instead of the moment when the
     environment is
 created or the bindings of the imports change.
     All bindings in IMP are immutable. If you apply
     `environment-define' or `environment-undefine' to
 IMP, Guile
     will signal an
  `environment:immutable-binding' error. However,
     notice that the set of bindings in IMP may still change,
 if one
     of its imported environments changes.
   
 import-environment?

 -- Scheme Procedure: import-environment? object
     Return `#t' if object is an import environment, or
 `#f'
     otherwise.
   
 import-environment-imports

 -- Scheme Procedure: import-environment-imports env
     Return the list of environments imported by the import
     environment ENV.
   
 import-environment-set-imports!

 -- Scheme Procedure: import-environment-set-imports! env imports
     Change ENV's list of imported environments to
 IMPORTS, and check
     for conflicts.
   
 make-export-environment

 -- Scheme Procedure: make-export-environment private signature
     Return a new environment EXP containing only those
 bindings in
     private whose symbols are present in
 SIGNATURE. The PRIVATE
     argument must be an
 environment.
 
 The environment EXP binds
     symbol to location when
 ENV does, and symbol is exported by
     SIGNATURE.
 
 SIGNATURE is a list specifying which of the
     bindings in
 PRIVATE should be visible in EXP. Each element of
     SIGNATURE should be a list of the form:
   (symbol attribute
     ...)
 where each attribute is one of the following:
    the symbol `mutable-location'
          EXP should treat the
   location bound to symbol as mutable.
          That is, EXP
   will pass calls to `environment-set!' or
          `environment-cell' directly through to private.

    the symbol `immutable-location'
          EXP should treat
   the location bound to symbol as
          immutable. If the program
   applies `environment-set!' to
          EXP and symbol, or
   calls `environment-cell' to obtain a
          writable value
   cell, `environment-set!' will signal an
          `environment:immutable-location' error. Note that, even
          if an export environment treats a location as immutable, the
           underlying environment may treat it as mutable, so its
          value may change.
     It is an error for an element of signature to specify both
     `mutable-location' and `immutable-location'. If
 neither is
     specified, `immutable-location' is assumed.
 
 As a special
     case, if an element of signature is a lone
 symbol SYM, it is
     equivalent to an element of the form
 `(sym)'.
 
 All bindings
     in EXP are immutable. If you apply
 `environment-define' or
     `environment-undefine' to
 EXP, Guile will signal an
     `environment:immutable-binding' error. However,
 notice that the
     set of bindings in EXP may still change,
 if the bindings in
     private change.
   
 export-environment?

 -- Scheme Procedure: export-environment? object
     Return `#t' if object is an export environment, or
 `#f'
     otherwise.
   
 export-environment-private

 -- Scheme Procedure: export-environment-private env
     Return the private environment of export environment ENV.
   
 export-environment-set-private!

 -- Scheme Procedure: export-environment-set-private! env private
     Change the private environment of export environment ENV.
   
 export-environment-signature

 -- Scheme Procedure: export-environment-signature env
     Return the signature of export environment ENV.
   
 export-environment-set-signature!

 -- Scheme Procedure: export-environment-set-signature! env signature
     Change the signature of export environment ENV.
   
 eq?

 -- Scheme Procedure: eq? x y
     Return `#t' if X and Y are the same object,
 except for numbers
     and characters.  For example,
 
          (define x (vector 1 2 3))
          (define y (vector 1 2 3))
          
          (eq? x x)  => #t
          (eq? x y)  => #f
     
 Numbers and characters are not equal to any other object, but
     the problem is they're not necessarily `eq?' to themselves
     either.  This is even so when the number comes directly from a
     variable,
 
          (let ((n (+ 2 3)))
            (eq? n n))       => *unspecified*
     
 Generally `eqv?' should be used when comparing numbers or
     characters.  `=' or `char=?' can be used too.
 
 It's worth
     noting that end-of-list `()', `#t',
 `#f', a symbol of a given
     name, and a keyword of a given
 name, are unique objects.
     There's just one of each, so for
 instance no matter how `()'
     arises in a program, it's the
 same object and can be compared
     with `eq?',
 
          (define x (cdr '(123)))
          (define y (cdr '(456)))
          (eq? x y) => #t
          
          (define x (string->symbol "foo"))
          (eq? x 'foo) => #t

 eqv?

 -- Scheme Procedure: eqv? x y
     Return `#t' if X and Y are the same object, or
 for characters
     and numbers the same value.
 
 On objects except characters and
     numbers, `eqv?' is the
 same as `eq?', it's true if X and Y are
     the
 same object.
 
 If X and Y are numbers or characters,
     `eqv?'
 compares their type and value.  An exact number is not
     `eqv?' to an inexact number (even if their value is the
 same).
     
          (eqv? 3 (+ 1 2)) => #t
          (eqv? 1 1.0)     => #f

 equal?

 -- Scheme Procedure: equal? x y
     Return `#t' if X and Y are the same type, and
 their contents or
     value are equal.
 
 For a pair, string, vector or array,
     `equal?' compares the
 contents, and does so using using the same
     `equal?'
 recursively, so a deep structure can be traversed.
 
          (equal? (list 1 2 3) (list 1 2 3))   => #t
          (equal? (list 1 2 3) (vector 1 2 3)) => #f
     
 For other objects, `equal?' compares as per `eqv?',
 which
     means characters and numbers are compared by type and
 value (and
     like `eqv?', exact and inexact numbers are not
 `equal?', even if
     their value is the same).
 
          (equal? 3 (+ 1 2)) => #t
          (equal? 1 1.0)     => #f
     
 Hash tables are currently only compared as per `eq?', so
 two
     different tables are not `equal?', even if their
 contents are
     the same.
 
 `equal?' does not support circular data structures,
     it may
 go into an infinite loop if asked to compare two circular
     lists
 or similar.
 
 New application-defined object types
     (Smobs) have an
 `equalp' handler which is called by `equal?'.
     This
 lets an application traverse the contents or control what
     is
 considered `equal?' for two such objects.  If there's no
     handler, the default is to just compare as per `eq?'.
   
 scm-error

 -- Scheme Procedure: scm-error key subr message args data
     Raise an error with key KEY.  SUBR can be a string
 naming the
     procedure associated with the error, or `#f'.
 MESSAGE is the
     error message string, possibly containing
 `~S' and `~A' escapes.
     When an error is reported,
 these are replaced by formatting the
     corresponding members of
 ARGS: `~A' (was `%s' in older versions
     of
 Guile) formats using `display' and `~S' (was
 `%S') formats
     using `write'.  DATA is a list or
 `#f' depending on KEY: if KEY
     is
 `system-error' then it should be a list containing the
 Unix
     `errno' value; If KEY is `signal' then it
 should be a list
     containing the Unix signal number; If
 KEY is `out-of-range' or
     `wrong-type-arg',
 it is a list containing the bad value;
     otherwise
 it will usually be `#f'.
   
 strerror

 -- Scheme Procedure: strerror err
     Return the Unix error message corresponding to ERR, which
 must
     be an integer value.
   
 apply:nconc2last

 -- Scheme Procedure: apply:nconc2last lst
     Given a list (ARG1 ... ARGS), this function
 conses the ARG1 ...
     arguments onto the front of
 ARGS, and returns the resulting
     list. Note that
 ARGS is a list; thus, the argument to this
     function is
 a list whose last element is a list.
 Note: Rather
     than do new consing, `apply:nconc2last'
 destroys its argument,
     so use with care.
   
 force

 -- Scheme Procedure: force promise
     If the promise X has not been computed yet, compute and
 return
     X, otherwise just return the previously computed
 value.
   
 promise?

 -- Scheme Procedure: promise? obj
     Return true if OBJ is a promise, i.e. a delayed computation
     (*note Delayed evaluation: (r5rs.info)Delayed evaluation.).
   
 cons-source

 -- Scheme Procedure: cons-source xorig x y
     Create and return a new pair whose car and cdr are X and Y.
 Any
     source properties associated with XORIG are also associated
 with
     the new pair.
   
 copy-tree

 -- Scheme Procedure: copy-tree obj
     Recursively copy the data tree that is bound to OBJ, and return a
     the new data structure.  `copy-tree' recurses down the
 contents
     of both pairs and vectors (since both cons cells and vector
     cells may point to arbitrary objects), and stops recursing when it
     hits
 any other object.
   
 primitive-eval

 -- Scheme Procedure: primitive-eval exp
     Evaluate EXP in the top-level environment specified by
 the
     current module.
   
 eval

 -- Scheme Procedure: eval exp module_or_state
     Evaluate EXP, a list representing a Scheme expression,
 in the
     top-level environment specified by
 MODULE_OR_STATE.
 While EXP
     is evaluated (using `primitive-eval'),
 MODULE_OR_STATE is made
     the current module when
 it is a module, or the current dynamic
     state when it is
 a dynamic state.Example: (eval '(+ 1 2)
     (interaction-environment))
   
 eval-options-interface

 -- Scheme Procedure: eval-options-interface [setting]
     Option interface for the evaluation options. Instead of using
     this procedure directly, use the procedures `eval-enable',
     `eval-disable', `eval-set!' and `eval-options'.
   
 evaluator-traps-interface

 -- Scheme Procedure: evaluator-traps-interface [setting]
     Option interface for the evaluator trap options.
   
 defined?

 -- Scheme Procedure: defined? sym [env]
     Return `#t' if SYM is defined in the lexical environment ENV.
     When ENV is not specified, look in the top-level environment as
     defined by the current module.
   
 map-in-order

 -- Scheme Procedure: map-in-order
     implemented by the C function "scm_map"
   
 self-evaluating?

 -- Scheme Procedure: self-evaluating? obj
     Return #t for objects which Guile considers self-evaluating
   
 load-extension

 -- Scheme Procedure: load-extension lib init
     Load and initialize the extension designated by LIB and INIT.
     When there is no pre-registered function for LIB/INIT, this is
     equivalent to
 
          (dynamic-call INIT (dynamic-link LIB))
     
 When there is a pre-registered function, that function is
     called
 instead.
 
 Normally, there is no pre-registered
     function.  This option exists
 only for situations where dynamic
     linking is unavailable or unwanted.
 In that case, you would
     statically link your program with the desired
 library, and
     register its init function right after Guile has been
     initialized.
 
 LIB should be a string denoting a shared library
     without any file type
 suffix such as ".so".  The suffix is
     provided automatically.  It
 should also not contain any
     directory components.  Libraries that
 implement Guile Extensions
     should be put into the normal locations for
 shared libraries.
     We recommend to use the naming convention
 libguile-bla-blum for
     a extension related to a module `(bla blum)'.
 
 The normal way
     for a extension to be used is to write a small Scheme
 file that
     defines a module, and to load the extension into this
 module.
     When the module is auto-loaded, the extension is loaded as
 well.
     For example,
 
          (define-module (bla blum))
          
          (load-extension "libguile-bla-blum" "bla_init_blum")

 program-arguments

 -- Scheme Procedure: program-arguments
 -- Scheme Procedure: command-line
     Return the list of command line arguments passed to Guile, as a
     list of
 strings.  The list includes the invoked program name,
     which is usually
 `"guile"', but excludes switches and parameters
     for command line
 options like `-e' and `-l'.
   
 set-program-arguments

 -- Scheme Procedure: set-program-arguments lst
     Set the command line arguments to be returned by
     `program-arguments' (and `command-line').  LST
 should be a list
     of strings, the first of which is the program
 name (either a
     script name, or just `"guile"').
 
 Program arguments are held
     in a fluid and therefore have a
 separate value in each Guile
     thread.  Neither the list nor the
 strings within it are copied,
     so should not be modified later.
   
 make-fluid

 -- Scheme Procedure: make-fluid
     Return a newly created fluid.
 Fluids are objects that can hold
     one
 value per dynamic state.  That is, modifications to this
     value are
 only visible to code that executes with the same
     dynamic state as
 the modifying code.  When a new dynamic state
     is constructed, it
 inherits the values from its parent.  Because
     each thread normally executes
 with its own dynamic state, you
     can use fluids for thread local storage.
   
 fluid?

 -- Scheme Procedure: fluid? obj
     Return `#t' iff OBJ is a fluid; otherwise, return
 `#f'.
   
 fluid-ref

 -- Scheme Procedure: fluid-ref fluid
     Return the value associated with FLUID in the current
 dynamic
     root.  If FLUID has not been set, then return
 `#f'.
   
 fluid-set!

 -- Scheme Procedure: fluid-set! fluid value
     Set the value associated with FLUID in the current dynamic root.
   
 with-fluids*

 -- Scheme Procedure: with-fluids* fluids values thunk
     Set FLUIDS to VALUES temporary, and call THUNK.
 FLUIDS must be a
     list of fluids and VALUES must be the same
 number of their
     values to be applied.  Each substitution is done
 one after
     another.  THUNK must be a procedure with no argument.
   
 with-fluid*

 -- Scheme Procedure: with-fluid* fluid value thunk
     Set FLUID to VALUE temporarily, and call THUNK.
 THUNK must be a
     procedure with no argument.
   
 make-dynamic-state

 -- Scheme Procedure: make-dynamic-state [parent]
     Return a copy of the dynamic state object PARENT
 or of the
     current dynamic state when PARENT is omitted.
   
 dynamic-state?

 -- Scheme Procedure: dynamic-state? obj
     Return `#t' if OBJ is a dynamic state object;
 return `#f'
     otherwise
   
 current-dynamic-state

 -- Scheme Procedure: current-dynamic-state
     Return the current dynamic state object.
   
 set-current-dynamic-state

 -- Scheme Procedure: set-current-dynamic-state state
     Set the current dynamic state object to STATE
 and return the
     previous current dynamic state object.
   
 with-dynamic-state

 -- Scheme Procedure: with-dynamic-state state proc
     Call PROC while STATE is the current dynamic
 state object.
   
 setvbuf

 -- Scheme Procedure: setvbuf port mode [size]
     Set the buffering mode for PORT.  MODE can be:
    `_IONBF'
          non-buffered

    `_IOLBF'
          line buffered

    `_IOFBF'
          block buffered, using a newly allocated buffer of SIZE
          bytes.
 If SIZE is omitted, a default size will be used.

 file-port?

 -- Scheme Procedure: file-port? obj
     Determine whether OBJ is a port that is related to a file.
   
 open-file

 -- Scheme Procedure: open-file filename mode
     Open the file whose name is FILENAME, and return a port
     representing that file.  The attributes of the port are
     determined by the MODE string.  The way in which this is
     interpreted is similar to C stdio.  The first character must be
     one of the following:
    `r'
          Open an existing file for input.

    `w'
          Open a file for output, creating it if it doesn't already
          exist
 or removing its contents if it does.

    `a'
          Open a file for output, creating it if it doesn't already
          exist.  All writes to the port will go to the end of the
          file.
 The "append mode" can be turned off while the port is
          in use
 *note fcntl: Ports and File Descriptors.
     The following additional characters can be appended:
    `b'
          Open the underlying file in binary mode, if supported by the
          operating system.

    `+'
          Open the port for both input and output.  E.g., `r+': open
          an existing file for both input and output.

    `0'
          Create an "unbuffered" port.  In this case input and output
          operations are passed directly to the underlying port
          implementation without additional buffering.  This is likely
          to
 slow down I/O operations.  The buffering mode can be
          changed
 while a port is in use *note setvbuf: Ports and
          File Descriptors.

    `l'
          Add line-buffering to the port.  The port output buffer will
          be
 automatically flushed whenever a newline character is
          written.
     In theory we could create read/write ports which were buffered
     in one direction only.  However this isn't included in the
     current interfaces.  If a file cannot be opened with the access
     requested, `open-file' throws an exception.
   
 gc-live-object-stats

 -- Scheme Procedure: gc-live-object-stats
     Return an alist of statistics of the current live objects. 
   
 gc-stats

 -- Scheme Procedure: gc-stats
     Return an association list of statistics about Guile's current
     use of storage.
 
   
 object-address

 -- Scheme Procedure: object-address obj
     Return an integer that for the lifetime of OBJ is uniquely
     returned by this function for OBJ
   
 gc

 -- Scheme Procedure: gc
     Scans all of SCM objects and reclaims for further use those that
     are
 no longer accessible.
   
 class-of

 -- Scheme Procedure: class-of x
     Return the class of X.
   
 %compute-slots

 -- Scheme Procedure: %compute-slots class
     Return a list consisting of the names of all slots belonging to
     class CLASS, i. e. the slots of CLASS and of all of
 its
     superclasses.
   
 get-keyword

 -- Scheme Procedure: get-keyword key l default_value
     Determine an associated value for the keyword KEY from
 the list
     L.  The list L has to consist of an even
 number of elements,
     where, starting with the first, every
 second element is a
     keyword, followed by its associated value.
 If L does not hold a
     value for KEY, the value
 DEFAULT_VALUE is returned.
   
 %initialize-object

 -- Scheme Procedure: %initialize-object obj initargs
     Initialize the object OBJ with the given arguments
 INITARGS.
   
 %prep-layout!

 -- Scheme Procedure: %prep-layout! class
     
   
 %inherit-magic!

 -- Scheme Procedure: %inherit-magic! class dsupers
     
   
 instance?

 -- Scheme Procedure: instance? obj
     Return `#t' if OBJ is an instance.
   
 class-name

 -- Scheme Procedure: class-name obj
     Return the class name of OBJ.
   
 class-direct-supers

 -- Scheme Procedure: class-direct-supers obj
     Return the direct superclasses of the class OBJ.
   
 class-direct-slots

 -- Scheme Procedure: class-direct-slots obj
     Return the direct slots of the class OBJ.
   
 class-direct-subclasses

 -- Scheme Procedure: class-direct-subclasses obj
     Return the direct subclasses of the class OBJ.
   
 class-direct-methods

 -- Scheme Procedure: class-direct-methods obj
     Return the direct methods of the class OBJ
   
 class-precedence-list

 -- Scheme Procedure: class-precedence-list obj
     Return the class precedence list of the class OBJ.
   
 class-slots

 -- Scheme Procedure: class-slots obj
     Return the slot list of the class OBJ.
   
 class-environment

 -- Scheme Procedure: class-environment obj
     Return the environment of the class OBJ.
   
 generic-function-name

 -- Scheme Procedure: generic-function-name obj
     Return the name of the generic function OBJ.
   
 generic-function-methods

 -- Scheme Procedure: generic-function-methods obj
     Return the methods of the generic function OBJ.
   
 method-generic-function

 -- Scheme Procedure: method-generic-function obj
     Return the generic function for the method OBJ.
   
 method-specializers

 -- Scheme Procedure: method-specializers obj
     Return specializers of the method OBJ.
   
 method-procedure

 -- Scheme Procedure: method-procedure obj
     Return the procedure of the method OBJ.
   
 accessor-method-slot-definition

 -- Scheme Procedure: accessor-method-slot-definition obj
     Return the slot definition of the accessor OBJ.
   
 %tag-body

 -- Scheme Procedure: %tag-body body
     Internal GOOPS magic--don't use this function!
   
 make-unbound

 -- Scheme Procedure: make-unbound
     Return the unbound value.
   
 unbound?

 -- Scheme Procedure: unbound? obj
     Return `#t' if OBJ is unbound.
   
 assert-bound

 -- Scheme Procedure: assert-bound value obj
     Return VALUE if it is bound, and invoke the
 SLOT-UNBOUND method
     of OBJ if it is not.
   
 @assert-bound-ref

 -- Scheme Procedure: @assert-bound-ref obj index
     Like `assert-bound', but use INDEX for accessing
 the value from
     OBJ.
   
 %fast-slot-ref

 -- Scheme Procedure: %fast-slot-ref obj index
     Return the slot value with index INDEX from OBJ.
   
 %fast-slot-set!

 -- Scheme Procedure: %fast-slot-set! obj index value
     Set the slot with index INDEX in OBJ to
 VALUE.
   
 slot-ref-using-class

 -- Scheme Procedure: slot-ref-using-class class obj slot_name
     
   
 slot-set-using-class!

 -- Scheme Procedure: slot-set-using-class! class obj slot_name value
     
   
 slot-bound-using-class?

 -- Scheme Procedure: slot-bound-using-class? class obj slot_name
     
   
 slot-exists-using-class?

 -- Scheme Procedure: slot-exists-using-class? class obj slot_name
     
   
 slot-ref

 -- Scheme Procedure: slot-ref obj slot_name
     Return the value from OBJ's slot with the name
 SLOT_NAME.
   
 slot-set!

 -- Scheme Procedure: slot-set! obj slot_name value
     Set the slot named SLOT_NAME of OBJ to VALUE.
   
 slot-bound?

 -- Scheme Procedure: slot-bound? obj slot_name
     Return `#t' if the slot named SLOT_NAME of OBJ
 is bound.
   
 slot-exists?

 -- Scheme Procedure: slot-exists? obj slot_name
     Return `#t' if OBJ has a slot named SLOT_NAME.
   
 %allocate-instance

 -- Scheme Procedure: %allocate-instance class initargs
     Create a new instance of class CLASS and initialize it
 from the
     arguments INITARGS.
   
 %set-object-setter!

 -- Scheme Procedure: %set-object-setter! obj setter
     
   
 %modify-instance

 -- Scheme Procedure: %modify-instance old new
     
   
 %modify-class

 -- Scheme Procedure: %modify-class old new
     
   
 %invalidate-class

 -- Scheme Procedure: %invalidate-class class
     
   
 %invalidate-method-cache!

 -- Scheme Procedure: %invalidate-method-cache! gf
     
   
 generic-capability?

 -- Scheme Procedure: generic-capability? proc
     
   
 enable-primitive-generic!

 -- Scheme Procedure: enable-primitive-generic! . subrs
     
   
 primitive-generic-generic

 -- Scheme Procedure: primitive-generic-generic subr
     
   
 make

 -- Scheme Procedure: make . args
     Make a new object.  ARGS must contain the class and
 all
     necessary initialization information.
   
 find-method

 -- Scheme Procedure: find-method . l
     
   
 %method-more-specific?

 -- Scheme Procedure: %method-more-specific? m1 m2 targs
     Return true if method M1 is more specific than M2 given the
     argument types (classes) listed in TARGS.
   
 %goops-loaded

 -- Scheme Procedure: %goops-loaded
     Announce that GOOPS is loaded and perform initialization
 on the
     C level which depends on the loaded GOOPS modules.
   
 make-guardian

 -- Scheme Procedure: make-guardian
     Create a new guardian.  A guardian protects a set of objects from
     garbage collection, allowing a program to apply cleanup or other
     actions.
 
 `make-guardian' returns a procedure representing the
     guardian.
 Calling the guardian procedure with an argument adds
     the argument to
 the guardian's set of protected objects.
     Calling the guardian
 procedure without an argument returns one
     of the protected objects
 which are ready for garbage collection,
     or `#f' if no such object
 is available.  Objects which are
     returned in this way are removed from
 the guardian.
 
 You can
     put a single object into a guardian more than once and you can
     put a single object into more than one guardian.  The object will
     then
 be returned multiple times by the guardian procedures.
 
     An object is eligible to be returned from a guardian when it is
     no
 longer referenced from outside any guardian.
 
 There is no
     guarantee about the order in which objects are returned
 from a
     guardian.  If you want to impose an order on finalization
     actions, for example, you can do that by keeping objects alive in
     some
 global data structure until they are no longer needed for
     finalizing
 other objects.
 
 Being an element in a weak
     vector, a key in a hash table with weak
 keys, or a value in a
     hash table with weak value does not prevent an
 object from being
     returned by a guardian.  But as long as an object
 can be
     returned from a guardian it will not be removed from such a
 weak
     vector or hash table.  In other words, a weak link does not
     prevent an object from being considered collectable, but being
     inside
 a guardian prevents a weak link from being broken.
 
 A
     key in a weak key hash table can be though of as having a strong
     reference to its associated value as long as the key is
     accessible.
 Consequently, when the key only accessible from
     within a guardian, the
 reference from the key to the value is
     also considered to be coming
 from within a guardian.  Thus, if
     there is no other reference to the
 value, it is eligible to be
     returned from a guardian.
 
   
 hashq

 -- Scheme Procedure: hashq key size
     Determine a hash value for KEY that is suitable for
 lookups in a
     hashtable of size SIZE, where `eq?' is
 used as the equality
     predicate.  The function returns an
 integer in the range 0 to
     SIZE - 1.  Note that
 `hashq' may use internal addresses.  Thus
     two calls to
 hashq where the keys are `eq?' are not guaranteed
     to
 deliver the same value if the key object gets garbage
     collected
 in between.  This can happen, for example with
     symbols:
 `(hashq 'foo n) (gc) (hashq 'foo n)' may produce two
     different values, since `foo' will be garbage collected.
   
 hashv

 -- Scheme Procedure: hashv key size
     Determine a hash value for KEY that is suitable for
 lookups in a
     hashtable of size SIZE, where `eqv?' is
 used as the equality
     predicate.  The function returns an
 integer in the range 0 to
     SIZE - 1.  Note that
 `(hashv key)' may use internal addresses.
     Thus two calls
 to hashv where the keys are `eqv?' are not
     guaranteed to
 deliver the same value if the key object gets
     garbage collected
 in between.  This can happen, for example with
     symbols:
 `(hashv 'foo n) (gc) (hashv 'foo n)' may produce two
     different values, since `foo' will be garbage collected.
   
 hash

 -- Scheme Procedure: hash key size
     Determine a hash value for KEY that is suitable for
 lookups in a
     hashtable of size SIZE, where `equal?'
 is used as the equality
     predicate.  The function returns an
 integer in the range 0 to
     SIZE - 1.
   
 make-hash-table

 -- Scheme Procedure: make-hash-table [n]
     Make a new abstract hash table object with minimum number of
     buckets N
 
   
 make-weak-key-hash-table

 -- Scheme Procedure: make-weak-key-hash-table [n]
 -- Scheme Procedure: make-weak-value-hash-table size
 -- Scheme Procedure: make-doubly-weak-hash-table size
     Return a weak hash table with SIZE buckets.
 
 You can modify
     weak hash tables in exactly the same way you
 would modify
     regular hash tables. (*note Hash Tables::)
   
 make-weak-value-hash-table

 -- Scheme Procedure: make-weak-value-hash-table [n]
     Return a hash table with weak values with SIZE buckets.
 (*note
     Hash Tables::)
   
 make-doubly-weak-hash-table

 -- Scheme Procedure: make-doubly-weak-hash-table n
     Return a hash table with weak keys and values with SIZE
 buckets.
     (*note Hash Tables::)
   
 hash-table?

 -- Scheme Procedure: hash-table? obj
     Return `#t' if OBJ is an abstract hash table object.
   
 weak-key-hash-table?

 -- Scheme Procedure: weak-key-hash-table? obj
 -- Scheme Procedure: weak-value-hash-table? obj
 -- Scheme Procedure: doubly-weak-hash-table? obj
     Return `#t' if OBJ is the specified weak hash
 table. Note that a
     doubly weak hash table is neither a weak key
 nor a weak value
     hash table.
   
 weak-value-hash-table?

 -- Scheme Procedure: weak-value-hash-table? obj
     Return `#t' if OBJ is a weak value hash table.
   
 doubly-weak-hash-table?

 -- Scheme Procedure: doubly-weak-hash-table? obj
     Return `#t' if OBJ is a doubly weak hash table.
   
 hash-clear!

 -- Scheme Procedure: hash-clear! table
     Remove all items from TABLE (without triggering a resize).
   
 hashq-get-handle

 -- Scheme Procedure: hashq-get-handle table key
     This procedure returns the `(key . value)' pair from the
 hash
     table TABLE.  If TABLE does not hold an
 associated value for
     KEY, `#f' is returned.
 Uses `eq?' for equality testing.
   
 hashq-create-handle!

 -- Scheme Procedure: hashq-create-handle! table key init
     This function looks up KEY in TABLE and returns its handle.
 If
     KEY is not already present, a new handle is created which
     associates KEY with INIT.
   
 hashq-ref

 -- Scheme Procedure: hashq-ref table key [dflt]
     Look up KEY in the hash table TABLE, and return the
 value (if
     any) associated with it.  If KEY is not found,
 return DEFAULT
     (or `#f' if no DEFAULT argument
 is supplied).  Uses `eq?' for
     equality testing.
   
 hashq-set!

 -- Scheme Procedure: hashq-set! table key val
     Find the entry in TABLE associated with KEY, and
 store VALUE
     there. Uses `eq?' for equality testing.
   
 hashq-remove!

 -- Scheme Procedure: hashq-remove! table key
     Remove KEY (and any value associated with it) from
 TABLE.  Uses
     `eq?' for equality tests.
   
 hashv-get-handle

 -- Scheme Procedure: hashv-get-handle table key
     This procedure returns the `(key . value)' pair from the
 hash
     table TABLE.  If TABLE does not hold an
 associated value for
     KEY, `#f' is returned.
 Uses `eqv?' for equality testing.
   
 hashv-create-handle!

 -- Scheme Procedure: hashv-create-handle! table key init
     This function looks up KEY in TABLE and returns its handle.
 If
     KEY is not already present, a new handle is created which
     associates KEY with INIT.
   
 hashv-ref

 -- Scheme Procedure: hashv-ref table key [dflt]
     Look up KEY in the hash table TABLE, and return the
 value (if
     any) associated with it.  If KEY is not found,
 return DEFAULT
     (or `#f' if no DEFAULT argument
 is supplied).  Uses `eqv?' for
     equality testing.
   
 hashv-set!

 -- Scheme Procedure: hashv-set! table key val
     Find the entry in TABLE associated with KEY, and
 store VALUE
     there. Uses `eqv?' for equality testing.
   
 hashv-remove!

 -- Scheme Procedure: hashv-remove! table key
     Remove KEY (and any value associated with it) from
 TABLE.  Uses
     `eqv?' for equality tests.
   
 hash-get-handle

 -- Scheme Procedure: hash-get-handle table key
     This procedure returns the `(key . value)' pair from the
 hash
     table TABLE.  If TABLE does not hold an
 associated value for
     KEY, `#f' is returned.
 Uses `equal?' for equality testing.
   
 hash-create-handle!

 -- Scheme Procedure: hash-create-handle! table key init
     This function looks up KEY in TABLE and returns its handle.
 If
     KEY is not already present, a new handle is created which
     associates KEY with INIT.
   
 hash-ref

 -- Scheme Procedure: hash-ref table key [dflt]
     Look up KEY in the hash table TABLE, and return the
 value (if
     any) associated with it.  If KEY is not found,
 return DEFAULT
     (or `#f' if no DEFAULT argument
 is supplied).  Uses `equal?' for
     equality testing.
   
 hash-set!

 -- Scheme Procedure: hash-set! table key val
     Find the entry in TABLE associated with KEY, and
 store VALUE
     there. Uses `equal?' for equality
 testing.
   
 hash-remove!

 -- Scheme Procedure: hash-remove! table key
     Remove KEY (and any value associated with it) from
 TABLE.  Uses
     `equal?' for equality tests.
   
 hashx-get-handle

 -- Scheme Procedure: hashx-get-handle hash assoc table key
     This behaves the same way as the corresponding
 `-get-handle'
     function, but uses HASH as a hash
 function and ASSOC to compare
     keys.  `hash' must be
 a function that takes two arguments, a key
     to be hashed and a
 table size.  `assoc' must be an associator
     function, like
 `assoc', `assq' or `assv'.
   
 hashx-create-handle!

 -- Scheme Procedure: hashx-create-handle! hash assoc table key init
     This behaves the same way as the corresponding
 `-create-handle'
     function, but uses HASH as a hash
 function and ASSOC to compare
     keys.  `hash' must be
 a function that takes two arguments, a key
     to be hashed and a
 table size.  `assoc' must be an associator
     function, like
 `assoc', `assq' or `assv'.
   
 hashx-ref

 -- Scheme Procedure: hashx-ref hash assoc table key [dflt]
     This behaves the same way as the corresponding `ref'
 function,
     but uses HASH as a hash function and
 ASSOC to compare keys.
     `hash' must be a function
 that takes two arguments, a key to be
     hashed and a table size.
 `assoc' must be an associator function,
     like `assoc',
 `assq' or `assv'.
 
 By way of illustration,
     `hashq-ref table key' is
 equivalent to `hashx-ref hashq assq
     table key'.
   
 hashx-set!

 -- Scheme Procedure: hashx-set! hash assoc table key val
     This behaves the same way as the corresponding `set!'
 function,
     but uses HASH as a hash function and
 ASSOC to compare keys.
     `hash' must be a function
 that takes two arguments, a key to be
     hashed and a table size.
 `assoc' must be an associator function,
     like `assoc',
 `assq' or `assv'.
 
  By way of illustration,
     `hashq-set! table key' is
 equivalent to `hashx-set!  hashq assq
     table key'.
   
 hashx-remove!

 -- Scheme Procedure: hashx-remove! hash assoc table obj
     This behaves the same way as the corresponding `remove!'
     function, but uses HASH as a hash function and
 ASSOC to compare
     keys.  `hash' must be a function
 that takes two arguments, a key
     to be hashed and a table size.
 `assoc' must be an associator
     function, like `assoc',
 `assq' or `assv'.
 
  By way of
     illustration, `hashq-remove! table key' is
 equivalent to
     `hashx-remove!  hashq assq #f table key'.
   
 hash-fold

 -- Scheme Procedure: hash-fold proc init table
     An iterator over hash-table elements.
 Accumulates and returns a
     result by applying PROC successively.
 The arguments to PROC are
     "(key value prior-result)" where key
 and value are successive
     pairs from the hash table TABLE, and
 prior-result is either INIT
     (for the first application of PROC)
 or the return value of the
     previous application of PROC.
 For example, `(hash-fold acons '()
     tab)' will convert a hash
 table into an a-list of key-value
     pairs.
   
 hash-for-each

 -- Scheme Procedure: hash-for-each proc table
     An iterator over hash-table elements.
 Applies PROC successively
     on all hash table items.
 The arguments to PROC are "(key value)"
     where key
 and value are successive pairs from the hash table
     TABLE.
   
 hash-for-each-handle

 -- Scheme Procedure: hash-for-each-handle proc table
     An iterator over hash-table elements.
 Applies PROC successively
     on all hash table handles.
   
 hash-map->list

 -- Scheme Procedure: hash-map->list proc table
     An iterator over hash-table elements.
 Accumulates and returns as
     a list the results of applying PROC successively.
 The arguments
     to PROC are "(key value)" where key
 and value are successive
     pairs from the hash table TABLE.
   
 make-hook

 -- Scheme Procedure: make-hook [n_args]
     Create a hook for storing procedure of arity N_ARGS.
 N_ARGS
     defaults to zero.  The returned value is a hook
 object to be
     used with the other hook procedures.
   
 hook?

 -- Scheme Procedure: hook? x
     Return `#t' if X is a hook, `#f' otherwise.
   
 hook-empty?

 -- Scheme Procedure: hook-empty? hook
     Return `#t' if HOOK is an empty hook, `#f'
 otherwise.
   
 add-hook!

 -- Scheme Procedure: add-hook! hook proc [append_p]
     Add the procedure PROC to the hook HOOK. The
 procedure is added
     to the end if APPEND_P is true,
 otherwise it is added to the
     front.  The return value of this
 procedure is not specified.
   
 remove-hook!

 -- Scheme Procedure: remove-hook! hook proc
     Remove the procedure PROC from the hook HOOK.  The
 return value
     of this procedure is not specified.
   
 reset-hook!

 -- Scheme Procedure: reset-hook! hook
     Remove all procedures from the hook HOOK.  The return
 value of
     this procedure is not specified.
   
 run-hook

 -- Scheme Procedure: run-hook hook . args
     Apply all procedures from the hook HOOK to the arguments
 ARGS.
     The order of the procedure application is first to
 last.  The
     return value of this procedure is not specified.
   
 hook->list

 -- Scheme Procedure: hook->list hook
     Convert the procedure list of HOOK to a list.
   
 gettext

 -- Scheme Procedure: gettext msgid [domain [category]]
     Return the translation of MSGID in the message domain DOMAIN.
     DOMAIN is optional and defaults to the domain set through
     (textdomain).  CATEGORY is optional and defaults to LC_MESSAGES.
   
 ngettext

 -- Scheme Procedure: ngettext msgid msgid_plural n [domain [category]]
     Return the translation of MSGID/MSGID_PLURAL in the message domain
     DOMAIN, with the plural form being chosen appropriately for the
     number N.  DOMAIN is optional and defaults to the domain set
     through (textdomain). CATEGORY is optional and defaults to
     LC_MESSAGES.
   
 textdomain

 -- Scheme Procedure: textdomain [domainname]
     If optional parameter DOMAINNAME is supplied, set the textdomain.
     Return the textdomain.
   
 bindtextdomain

 -- Scheme Procedure: bindtextdomain domainname [directory]
     If optional parameter DIRECTORY is supplied, set message catalogs
     to directory DIRECTORY.  Return the directory bound to
     DOMAINNAME.
   
 bind-textdomain-codeset

 -- Scheme Procedure: bind-textdomain-codeset domainname [encoding]
     If optional parameter ENCODING is supplied, set encoding for
     message catalogs of DOMAINNAME.  Return the encoding of
     DOMAINNAME.
   
 ftell

 -- Scheme Procedure: ftell fd_port
     Return an integer representing the current position of
 FD/PORT,
     measured from the beginning.  Equivalent to:
 
          (seek port 0 SEEK_CUR)

 redirect-port

 -- Scheme Procedure: redirect-port old new
     This procedure takes two ports and duplicates the underlying file
     descriptor from OLD-PORT into NEW-PORT.  The
 current file
     descriptor in NEW-PORT will be closed.
 After the redirection the
     two ports will share a file position
 and file status flags.
 
     The return value is unspecified.
 
 Unexpected behaviour can
     result if both ports are subsequently used
 and the original
     and/or duplicate ports are buffered.
 
 This procedure does not
     have any side effects on other ports or
 revealed counts.
   
 dup->fdes

 -- Scheme Procedure: dup->fdes fd_or_port [fd]
     Return a new integer file descriptor referring to the open file
     designated by FD_OR_PORT, which must be either an open
 file port
     or a file descriptor.
   
 dup2

 -- Scheme Procedure: dup2 oldfd newfd
     A simple wrapper for the `dup2' system call.
 Copies the file
     descriptor OLDFD to descriptor
 number NEWFD, replacing the
     previous meaning
 of NEWFD.  Both OLDFD and NEWFD must
 be
     integers.
 Unlike for dup->fdes or primitive-move->fdes, no
     attempt
 is made to move away ports which are using NEWFD.
 The
     return value is unspecified.
   
 fileno

 -- Scheme Procedure: fileno port
     Return the integer file descriptor underlying PORT.  Does
 not
     change its revealed count.
   
 isatty?

 -- Scheme Procedure: isatty? port
     Return `#t' if PORT is using a serial non-file
 device, otherwise
     `#f'.
   
 fdopen

 -- Scheme Procedure: fdopen fdes modes
     Return a new port based on the file descriptor FDES.
 Modes are
     given by the string MODES.  The revealed count
 of the port is
     initialized to zero.  The modes string is the
 same as that
     accepted by *note open-file: File Ports.
   
 primitive-move->fdes

 -- Scheme Procedure: primitive-move->fdes port fd
     Moves the underlying file descriptor for PORT to the integer
     value FDES without changing the revealed count of PORT.
 Any
     other ports already using this descriptor will be automatically
     shifted to new descriptors and their revealed counts reset to
     zero.
 The return value is `#f' if the file descriptor already
     had the
 required value or `#t' if it was moved.
   
 fdes->ports

 -- Scheme Procedure: fdes->ports fd
     Return a list of existing ports which have FDES as an
 underlying
     file descriptor, without changing their revealed
 counts.
   
 keyword?

 -- Scheme Procedure: keyword? obj
     Return `#t' if the argument OBJ is a keyword, else
 `#f'.
   
 symbol->keyword

 -- Scheme Procedure: symbol->keyword symbol
     Return the keyword with the same name as SYMBOL.
   
 keyword->symbol

 -- Scheme Procedure: keyword->symbol keyword
     Return the symbol with the same name as KEYWORD.
   
 make-list

 -- Scheme Procedure: make-list n [init]
     Create a list containing of N elements, where each
 element is
     initialized to INIT.  INIT defaults to
 the empty list `()' if
     not given.
   
 cons*

 -- Scheme Procedure: cons* arg . rest
     Like `list', but the last arg provides the tail of the
     constructed list, returning `(cons ARG1 (cons
 ARG2 (cons ...
     ARGN)))'.  Requires at least one
 argument.  If given one
     argument, that argument is returned as
 result.  This function is
     called `list*' in some other
 Schemes and in Common LISP.
   
 null?

 -- Scheme Procedure: null? x
     Return `#t' iff X is the empty list, else `#f'.
   
 list?

 -- Scheme Procedure: list? x
     Return `#t' iff X is a proper list, else `#f'.
   
 length

 -- Scheme Procedure: length lst
     Return the number of elements in list LST.
   
 append

 -- Scheme Procedure: append . args
     Return a list consisting of the elements the lists passed as
     arguments.
          (append '(x) '(y))          =>  (x y)
          (append '(a) '(b c d))      =>  (a b c d)
          (append '(a (b)) '((c)))    =>  (a (b) (c))
     The resulting list is always newly allocated, except that it
     shares structure with the last list argument.  The last
 argument
     may actually be any object; an improper list results
 if the last
     argument is not a proper list.
          (append '(a b) '(c . d))    =>  (a b c . d)
          (append '() 'a)             =>  a

 append!

 -- Scheme Procedure: append! . lists
     A destructive version of `append' (*note Pairs and Lists:
     (r5rs)Pairs and Lists.).  The cdr field
 of each list's final
     pair is changed to point to the head of
 the next list, so no
     consing is performed.  Return
 the mutated list.
   
 last-pair

 -- Scheme Procedure: last-pair lst
     Return the last pair in LST, signalling an error if
 LST is
     circular.
   
 reverse

 -- Scheme Procedure: reverse lst
     Return a new list that contains the elements of LST but
 in
     reverse order.
   
 reverse!

 -- Scheme Procedure: reverse! lst [new_tail]
     A destructive version of `reverse' (*note Pairs and Lists:
     (r5rs)Pairs and Lists.).  The cdr of each cell in LST is
     modified to point to the previous list element.  Return the
     reversed list.
 
 Caveat: because the list is modified in place,
     the tail of the original
 list now becomes its head, and the head
     of the original list now becomes
 the tail.  Therefore, the LST
     symbol to which the head of the
 original list was bound now
     points to the tail.  To ensure that the head
 of the modified
     list is not lost, it is wise to save the return value of
     `reverse!'
   
 list-ref

 -- Scheme Procedure: list-ref list k
     Return the Kth element from LIST.
   
 list-set!

 -- Scheme Procedure: list-set! list k val
     Set the Kth element of LIST to VAL.
   
 list-cdr-ref

 -- Scheme Procedure: list-cdr-ref
     implemented by the C function "scm_list_tail"
   
 list-tail

 -- Scheme Procedure: list-tail lst k
 -- Scheme Procedure: list-cdr-ref lst k
     Return the "tail" of LST beginning with its Kth element.
 The
     first element of the list is considered to be element 0.
 
     `list-tail' and `list-cdr-ref' are identical.  It may help to
     think of `list-cdr-ref' as accessing the Kth cdr of the list,
 or
     returning the results of cdring K times down LST.
   
 list-cdr-set!

 -- Scheme Procedure: list-cdr-set! list k val
     Set the Kth cdr of LIST to VAL.
   
 list-head

 -- Scheme Procedure: list-head lst k
     Copy the first K elements from LST into a new list, and
 return
     it.
   
 list-copy

 -- Scheme Procedure: list-copy lst
     Return a (newly-created) copy of LST.
   
 list

 -- Scheme Procedure: list . objs
     Return a list containing OBJS, the arguments to
 `list'.
   
 memq

 -- Scheme Procedure: memq x lst
     Return the first sublist of LST whose car is `eq?'
 to X where
     the sublists of LST are the non-empty
 lists returned by
     `(list-tail LST K)' for
 K less than the length of LST.  If X
     does not
 occur in LST, then `#f' (not the empty list) is
     returned.
   
 memv

 -- Scheme Procedure: memv x lst
     Return the first sublist of LST whose car is `eqv?'
 to X where
     the sublists of LST are the non-empty
 lists returned by
     `(list-tail LST K)' for
 K less than the length of LST.  If X
     does not
 occur in LST, then `#f' (not the empty list) is
     returned.
   
 member

 -- Scheme Procedure: member x lst
     Return the first sublist of LST whose car is
 `equal?' to X where
     the sublists of LST are
 the non-empty lists returned by
     `(list-tail LST
 K)' for K less than the length of LST.  If
 X
     does not occur in LST, then `#f' (not the
 empty list) is
     returned.
   
 delq!

 -- Scheme Procedure: delq! item lst
 -- Scheme Procedure: delv! item lst
 -- Scheme Procedure: delete! item lst
     These procedures are destructive versions of `delq', `delv'
 and
     `delete': they modify the existing LST
 rather than creating a
     new list.  Caveat evaluator: Like other
 destructive list
     functions, these functions cannot modify the binding of
 LST, and
     so cannot be used to delete the first element of
 LST
     destructively.
   
 delv!

 -- Scheme Procedure: delv! item lst
     Destructively remove all elements from LST that are
 `eqv?' to
     ITEM.
   
 delete!

 -- Scheme Procedure: delete! item lst
     Destructively remove all elements from LST that are
 `equal?' to
     ITEM.
   
 delq

 -- Scheme Procedure: delq item lst
     Return a newly-created copy of LST with elements
 `eq?' to ITEM
     removed.  This procedure mirrors
 `memq': `delq' compares
     elements of LST against
 ITEM with `eq?'.
   
 delv

 -- Scheme Procedure: delv item lst
     Return a newly-created copy of LST with elements
 `eqv?'  to ITEM
     removed.  This procedure mirrors
 `memv': `delv' compares
     elements of LST against
 ITEM with `eqv?'.
   
 delete

 -- Scheme Procedure: delete item lst
     Return a newly-created copy of LST with elements
 `equal?'  to
     ITEM removed.  This procedure mirrors
 `member': `delete'
     compares elements of LST
 against ITEM with `equal?'.
   
 delq1!

 -- Scheme Procedure: delq1! item lst
     Like `delq!', but only deletes the first occurrence of
 ITEM from
     LST.  Tests for equality using
 `eq?'.  See also `delv1!' and
     `delete1!'.
   
 delv1!

 -- Scheme Procedure: delv1! item lst
     Like `delv!', but only deletes the first occurrence of
 ITEM from
     LST.  Tests for equality using
 `eqv?'.  See also `delq1!' and
     `delete1!'.
   
 delete1!

 -- Scheme Procedure: delete1! item lst
     Like `delete!', but only deletes the first occurrence of
 ITEM
     from LST.  Tests for equality using
 `equal?'.  See also `delq1!'
     and `delv1!'.
   
 filter

 -- Scheme Procedure: filter pred list
     Return all the elements of 2nd arg LIST that satisfy predicate
     PRED.
 The list is not disordered - elements that appear in the
     result list occur
 in the same order as they occur in the
     argument list. The returned list may
 share a common tail with
     the argument list. The dynamic order in which the
 various
     applications of pred are made is not specified.
 
          (filter even? '(0 7 8 8 43 -4)) => (0 8 8 -4)

 filter!

 -- Scheme Procedure: filter! pred list
     Linear-update variant of `filter'.
   
 primitive-load

 -- Scheme Procedure: primitive-load filename
     Load the file named FILENAME and evaluate its contents in
 the
     top-level environment. The load paths are not searched;
 FILENAME
     must either be a full pathname or be a pathname
 relative to the
     current directory.  If the  variable
 `%load-hook' is defined, it
     should be bound to a procedure
 that will be called before any
     code is loaded.  See the
 documentation for `%load-hook' later in
     this section.
   
 %package-data-dir

 -- Scheme Procedure: %package-data-dir
     Return the name of the directory where Scheme packages, modules
     and
 libraries are kept.  On most Unix systems, this will be
     `/usr/local/share/guile'.
   
 %library-dir

 -- Scheme Procedure: %library-dir
     Return the directory where the Guile Scheme library files are
     installed.
 E.g., may return "/usr/share/guile/1.3.5".
   
 %site-dir

 -- Scheme Procedure: %site-dir
     Return the directory where the Guile site files are installed.
     E.g., may return "/usr/share/guile/site".
   
 parse-path

 -- Scheme Procedure: parse-path path [tail]
     Parse PATH, which is expected to be a colon-separated
 string,
     into a list and return the resulting list with
 TAIL appended. If
     PATH is `#f', TAIL
 is returned.
   
 search-path

 -- Scheme Procedure: search-path path filename [extensions]
     Search PATH for a directory containing a file named
 FILENAME.
     The file must be readable, and not a directory.
 If we find one,
     return its full filename; otherwise, return
 `#f'.  If FILENAME
     is absolute, return it unchanged.
 If given, EXTENSIONS is a list
     of strings; for each
 directory in PATH, we search for FILENAME
     concatenated with each EXTENSION.
   
 %search-load-path

 -- Scheme Procedure: %search-load-path filename
     Search %LOAD-PATH for the file named FILENAME,
 which must be
     readable by the current user.  If FILENAME
 is found in the list
     of paths to search or is an absolute
 pathname, return its full
     pathname.  Otherwise, return
 `#f'.  Filenames may have any of
     the optional extensions
 in the `%load-extensions' list;
     `%search-load-path'
 will try each extension automatically.
   
 primitive-load-path

 -- Scheme Procedure: primitive-load-path filename
     Search %LOAD-PATH for the file named FILENAME and
 load it into
     the top-level environment.  If FILENAME is a
 relative pathname
     and is not found in the list of search paths,
 an error is
     signalled.
   
 procedure->memoizing-macro

 -- Scheme Procedure: procedure->memoizing-macro code
     Return a "macro" which, when a symbol defined to this value
     appears as the first symbol in an expression, evaluates the
     result of applying CODE to the expression and the
 environment.
     
 `procedure->memoizing-macro' is the same as
     `procedure->macro', except that the expression returned by
 CODE
     replaces the original macro expression in the memoized
 form of
     the containing code.
   
 procedure->syntax

 -- Scheme Procedure: procedure->syntax code
     Return a "macro" which, when a symbol defined to this value
     appears as the first symbol in an expression, returns the
 result
     of applying CODE to the expression and the
 environment.
   
 procedure->macro

 -- Scheme Procedure: procedure->macro code
     Return a "macro" which, when a symbol defined to this value
     appears as the first symbol in an expression, evaluates the
     result of applying CODE to the expression and the
 environment.
     For example:
 
          (define trace
            (procedure->macro
             (lambda (x env) `(set! ,(cadr x) (tracef ,(cadr x) ',(cadr x))))))
          
          (trace foo) == (set! foo (tracef foo 'foo)).

 macro?

 -- Scheme Procedure: macro? obj
     Return `#t' if OBJ is a regular macro, a memoizing macro or a
     syntax transformer.
   
 macro-type

 -- Scheme Procedure: macro-type m
     Return one of the symbols `syntax', `macro' or
 `macro!',
     depending on whether M is a syntax
 transformer, a regular macro,
     or a memoizing macro,
 respectively.  If M is not a macro, `#f'
     is
 returned.
   
 macro-name

 -- Scheme Procedure: macro-name m
     Return the name of the macro M.
   
 macro-transformer

 -- Scheme Procedure: macro-transformer m
     Return the transformer of the macro M.
   
 current-module

 -- Scheme Procedure: current-module
     Return the current module.
   
 set-current-module

 -- Scheme Procedure: set-current-module module
     Set the current module to MODULE and return
 the previous current
     module.
   
 interaction-environment

 -- Scheme Procedure: interaction-environment
     Return a specifier for the environment that contains
     implementation-defined bindings, typically a superset of those
     listed in the report.  The intent is that this procedure will
     return the environment in which the implementation would
     evaluate expressions dynamically typed by the user.
   
 env-module

 -- Scheme Procedure: env-module env
     Return the module of ENV, a lexical environment.
   
 standard-eval-closure

 -- Scheme Procedure: standard-eval-closure module
     Return an eval closure for the module MODULE.
   
 standard-interface-eval-closure

 -- Scheme Procedure: standard-interface-eval-closure module
     Return a interface eval closure for the module MODULE. Such a
     closure does not allow new bindings to be added.
   
 module-import-interface

 -- Scheme Procedure: module-import-interface module sym
     
   
 %get-pre-modules-obarray

 -- Scheme Procedure: %get-pre-modules-obarray
     Return the obarray that is used for all new bindings before the
     module system is booted.  The first call to `set-current-module'
     will boot the module system.
   
 exact?

 -- Scheme Procedure: exact? x
     Return `#t' if X is an exact number, `#f'
 otherwise.
   
 odd?

 -- Scheme Procedure: odd? n
     Return `#t' if N is an odd number, `#f'
 otherwise.
   
 even?

 -- Scheme Procedure: even? n
     Return `#t' if N is an even number, `#f'
 otherwise.
   
 inf?

 -- Scheme Procedure: inf? x
     Return `#t' if X is either `+inf.0'
 or `-inf.0', `#f'
     otherwise.
   
 nan?

 -- Scheme Procedure: nan? n
     Return `#t' if N is a NaN, `#f'
 otherwise.
   
 inf

 -- Scheme Procedure: inf
     Return Inf.
   
 nan

 -- Scheme Procedure: nan
     Return NaN.
   
 abs

 -- Scheme Procedure: abs x
     Return the absolute value of X.
   
 logand

 -- Scheme Procedure: logand n1 n2
     Return the bitwise AND of the integer arguments.
 
          (logand) => -1
          (logand 7) => 7
          (logand #b111 #b011 #b001) => 1

 logior

 -- Scheme Procedure: logior n1 n2
     Return the bitwise OR of the integer arguments.
 
          (logior) => 0
          (logior 7) => 7
          (logior #b000 #b001 #b011) => 3

 logxor

 -- Scheme Procedure: logxor n1 n2
     Return the bitwise XOR of the integer arguments.  A bit is
 set
     in the result if it is set in an odd number of arguments.
          (logxor) => 0
          (logxor 7) => 7
          (logxor #b000 #b001 #b011) => 2
          (logxor #b000 #b001 #b011 #b011) => 1

 logtest

 -- Scheme Procedure: logtest j k
     Test whether J and K have any 1 bits in common.
 This is
     equivalent to `(not (zero? (logand j k)))', but
 without actually
     calculating the `logand', just testing
 for non-zero.
 
          (logtest #b0100 #b1011) => #f
          (logtest #b0100 #b0111) => #t

 logbit?

 -- Scheme Procedure: logbit? index j
     Test whether bit number INDEX in J is set.
 INDEX starts from 0
     for the least significant bit.
 
          (logbit? 0 #b1101) => #t
          (logbit? 1 #b1101) => #f
          (logbit? 2 #b1101) => #t
          (logbit? 3 #b1101) => #t
          (logbit? 4 #b1101) => #f

 lognot

 -- Scheme Procedure: lognot n
     Return the integer which is the ones-complement of the integer
     argument.
 
          (number->string (lognot #b10000000) 2)
             => "-10000001"
          (number->string (lognot #b0) 2)
             => "-1"

 modulo-expt

 -- Scheme Procedure: modulo-expt n k m
     Return N raised to the integer exponent
 K, modulo M.
 
          (modulo-expt 2 3 5)
             => 3

 integer-expt

 -- Scheme Procedure: integer-expt n k
     Return N raised to the power K.  K must be an
 exact integer, N
     can be any number.
 
 Negative K is supported, and results in
     1/n^abs(k)
 in the usual way.  N^0 is 1, as usual, and that
     includes 0^0 is 1.
 
          (integer-expt 2 5)   => 32
          (integer-expt -3 3)  => -27
          (integer-expt 5 -3)  => 1/125
          (integer-expt 0 0)   => 1

 ash

 -- Scheme Procedure: ash n cnt
     Return N shifted left by CNT bits, or shifted right
 if CNT is
     negative.  This is an "arithmetic" shift.
 
 This is effectively
     a multiplication by 2^CNT, and when
 CNT is negative it's a
     division, rounded towards negative
 infinity.  (Note that this is
     not the same rounding as
 `quotient' does.)
 
 With N viewed as
     an infinite precision twos complement,
 `ash' means a left shift
     introducing zero bits, or a right
 shift dropping bits.
 
          (number->string (ash #b1 3) 2)     => "1000"
          (number->string (ash #b1010 -1) 2) => "101"
          
          ;; -23 is bits ...11101001, -6 is bits ...111010
          (ash -23 -2) => -6

 bit-extract

 -- Scheme Procedure: bit-extract n start end
     Return the integer composed of the START (inclusive)
 through END
     (exclusive) bits of N.  The
 STARTth bit becomes the 0-th bit in
     the result.
 
          (number->string (bit-extract #b1101101010 0 4) 2)
             => "1010"
          (number->string (bit-extract #b1101101010 4 9) 2)
             => "10110"

 logcount

 -- Scheme Procedure: logcount n
     Return the number of bits in integer N.  If integer is
 positive,
     the 1-bits in its binary representation are counted.
 If
     negative, the 0-bits in its two's-complement binary
     representation are counted.  If 0, 0 is returned.
 
          (logcount #b10101010)
             => 4
          (logcount 0)
             => 0
          (logcount -2)
             => 1

 integer-length

 -- Scheme Procedure: integer-length n
     Return the number of bits necessary to represent N.
 
          (integer-length #b10101010)
             => 8
          (integer-length 0)
             => 0
          (integer-length #b1111)
             => 4

 number->string

 -- Scheme Procedure: number->string n [radix]
     Return a string holding the external representation of the
     number N in the given RADIX.  If N is
 inexact, a radix of 10
     will be used.
   
 string->number

 -- Scheme Procedure: string->number string [radix]
     Return a number of the maximally precise representation
     expressed by the given STRING. RADIX must be an
 exact integer,
     either 2, 8, 10, or 16. If supplied, RADIX
 is a default radix
     that may be overridden by an explicit radix
 prefix in STRING
     (e.g. "#o177"). If RADIX is not
 supplied, then the default radix
     is 10. If string is not a
 syntactically valid notation for a
     number, then
 `string->number' returns `#f'.
   
 number?

 -- Scheme Procedure: number? x
     Return `#t' if X is a number, `#f'
 otherwise.
   
 complex?

 -- Scheme Procedure: complex? x
     Return `#t' if X is a complex number, `#f'
 otherwise.  Note that
     the sets of real, rational and integer
 values form subsets of
     the set of complex numbers, i. e. the
 predicate will also be
     fulfilled if X is a real,
 rational or integer number.
   
 real?

 -- Scheme Procedure: real? x
     Return `#t' if X is a real number, `#f'
 otherwise.  Note that
     the set of integer values forms a subset of
 the set of real
     numbers, i. e. the predicate will also be
 fulfilled if X is an
     integer number.
   
 rational?

 -- Scheme Procedure: rational? x
     Return `#t' if X is a rational number, `#f'
 otherwise.  Note
     that the set of integer values forms a subset of
 the set of
     rational numbers, i. e. the predicate will also be
 fulfilled if
     X is an integer number.
   
 integer?

 -- Scheme Procedure: integer? x
     Return `#t' if X is an integer number, `#f'
 else.
   
 inexact?

 -- Scheme Procedure: inexact? x
     Return `#t' if X is an inexact number, `#f'
 else.
   
 1+

 -- Scheme Procedure: 1+ x
     Return X+1.
   
 1-

 -- Scheme Procedure: 1- x
     Return X-1.
   
 truncate

 -- Scheme Procedure: truncate x
     Round the number X towards zero.
   
 round

 -- Scheme Procedure: round x
     Round the number X towards the nearest integer. When it is exactly
     halfway between two integers, round towards the even one.
   
 floor

 -- Scheme Procedure: floor x
     Round the number X towards minus infinity.
   
 ceiling

 -- Scheme Procedure: ceiling x
     Round the number X towards infinity.
   
 $expt

 -- Scheme Procedure: $expt x y
     Return X raised to the power of Y. This
 procedure does not
     accept complex arguments.
   
 $atan2

 -- Scheme Procedure: $atan2 x y
     Return the arc tangent of the two arguments X and
 Y. This is
     similar to calculating the arc tangent of
 X / Y, except that the
     signs of both arguments
 are used to determine the quadrant of
     the result. This
 procedure does not accept complex arguments.
   
 make-rectangular

 -- Scheme Procedure: make-rectangular real_part imaginary_part
     Return a complex number constructed of the given REAL-PART and
     IMAGINARY-PART parts.
   
 make-polar

 -- Scheme Procedure: make-polar x y
     Return the complex number X * e^(i * Y).
   
 inexact->exact

 -- Scheme Procedure: inexact->exact z
     Return an exact number that is numerically closest to Z.
   
 rationalize

 -- Scheme Procedure: rationalize x eps
     Returns the _simplest_ rational number differing
 from X by no
     more than EPS.
 
 As required by R5RS, `rationalize' only
     returns an
 exact result when both its arguments are exact.
     Thus, you might need
 to use `inexact->exact' on the arguments.
     
          (rationalize (inexact->exact 1.2) 1/100)
          => 6/5

 log

 -- Scheme Procedure: log z
     Return the natural logarithm of Z.
   
 log10

 -- Scheme Procedure: log10 z
     Return the base 10 logarithm of Z.
   
 exp

 -- Scheme Procedure: exp z
     Return e to the power of Z, where e is the
 base of natural
     logarithms (2.71828...).
   
 sqrt

 -- Scheme Procedure: sqrt x
     Return the square root of Z.  Of the two possible roots
     (positive and negative), the one with the a positive real part
     is returned, or if that's zero then a positive imaginary part.
     Thus,
 
          (sqrt 9.0)       => 3.0
          (sqrt -9.0)      => 0.0+3.0i
          (sqrt 1.0+1.0i)  => 1.09868411346781+0.455089860562227i
          (sqrt -1.0-1.0i) => 0.455089860562227-1.09868411346781i

 entity?

 -- Scheme Procedure: entity? obj
     Return `#t' if OBJ is an entity.
   
 operator?

 -- Scheme Procedure: operator? obj
     Return `#t' if OBJ is an operator.
   
 valid-object-procedure?

 -- Scheme Procedure: valid-object-procedure? proc
     Return `#t' iff PROC is a procedure that can be used with
     `set-object-procedure'.  It is always valid to use a closure
     constructed by `lambda'.
   
 set-object-procedure!

 -- Scheme Procedure: set-object-procedure! obj proc
     Set the object procedure of OBJ to PROC.
 OBJ must be either an
     entity or an operator.
   
 make-class-object

 -- Scheme Procedure: make-class-object metaclass layout
     Create a new class object of class METACLASS, with the
 slot
     layout specified by LAYOUT.
   
 make-subclass-object

 -- Scheme Procedure: make-subclass-object class layout
     Create a subclass object of CLASS, with the slot layout
     specified by LAYOUT.
   
 object-properties

 -- Scheme Procedure: object-properties obj
     Return OBJ's property list.
   
 set-object-properties!

 -- Scheme Procedure: set-object-properties! obj alist
     Set OBJ's property list to ALIST.
   
 object-property

 -- Scheme Procedure: object-property obj key
     Return the property of OBJ with name KEY.
   
 set-object-property!

 -- Scheme Procedure: set-object-property! obj key value
     In OBJ's property list, set the property named KEY
 to VALUE.
   
 cons

 -- Scheme Procedure: cons x y
     Return a newly allocated pair whose car is X and whose
 cdr is Y.
     The pair is guaranteed to be different (in the
 sense of `eq?')
     from every previously existing object.
   
 pair?

 -- Scheme Procedure: pair? x
     Return `#t' if X is a pair; otherwise return
 `#f'.
   
 set-car!

 -- Scheme Procedure: set-car! pair value
     Stores VALUE in the car field of PAIR.  The value returned
 by
     `set-car!' is unspecified.
   
 set-cdr!

 -- Scheme Procedure: set-cdr! pair value
     Stores VALUE in the cdr field of PAIR.  The value returned
 by
     `set-cdr!' is unspecified.
   
 char-ready?

 -- Scheme Procedure: char-ready? [port]
     Return `#t' if a character is ready on input PORT
 and return
     `#f' otherwise.  If `char-ready?' returns
 `#t' then the next
     `read-char' operation on
 PORT is guaranteed not to hang.  If
     PORT is a file
 port at end of file then `char-ready?' returns
     `#t'.
 
 `char-ready?' exists to make it possible for a
     program to accept characters from interactive ports without
     getting stuck waiting for input.  Any input editors associated
     with such ports must make sure that characters whose existence
     has been asserted by `char-ready?' cannot be rubbed out.
 If
     `char-ready?' were to return `#f' at end of file,
 a port at end
     of file would be indistinguishable from an
 interactive port that
     has no ready characters.
   
 drain-input

 -- Scheme Procedure: drain-input port
     This procedure clears a port's input buffers, similar
 to the way
     that force-output clears the output buffer.  The
 contents of the
     buffers are returned as a single string, e.g.,
 
          (define p (open-input-file ...))
          (drain-input p) => empty string, nothing buffered yet.
          (unread-char (read-char p) p)
          (drain-input p) => initial chars from p, up to the buffer size.
     
 Draining the buffers may be useful for cleanly finishing
     buffered I/O so that the file descriptor can be used directly
     for further input.
   
 current-input-port

 -- Scheme Procedure: current-input-port
     Return the current input port.  This is the default port used
 by
     many input procedures.  Initially, `current-input-port'
 returns
     the "standard input" in Unix and C terminology.
   
 current-output-port

 -- Scheme Procedure: current-output-port
     Return the current output port.  This is the default port used
     by many output procedures.  Initially,
 `current-output-port'
     returns the "standard output" in
 Unix and C terminology.
   
 current-error-port

 -- Scheme Procedure: current-error-port
     Return the port to which errors and warnings should be sent (the
     "standard error" in Unix and C terminology).
   
 current-load-port

 -- Scheme Procedure: current-load-port
     Return the current-load-port.
 The load port is used internally
     by `primitive-load'.
   
 set-current-input-port

 -- Scheme Procedure: set-current-input-port port
 -- Scheme Procedure: set-current-output-port port
 -- Scheme Procedure: set-current-error-port port
     Change the ports returned by `current-input-port',
     `current-output-port' and `current-error-port', respectively,
 so
     that they use the supplied PORT for input or output.
   
 set-current-output-port

 -- Scheme Procedure: set-current-output-port port
     Set the current default output port to PORT.
   
 set-current-error-port

 -- Scheme Procedure: set-current-error-port port
     Set the current default error port to PORT.
   
 port-revealed

 -- Scheme Procedure: port-revealed port
     Return the revealed count for PORT.
   
 set-port-revealed!

 -- Scheme Procedure: set-port-revealed! port rcount
     Sets the revealed count for a port to a given value.
 The return
     value is unspecified.
   
 port-mode

 -- Scheme Procedure: port-mode port
     Return the port modes associated with the open port PORT.
 These
     will not necessarily be identical to the modes used when
 the
     port was opened, since modes such as "append" which are
 used
     only during port creation are not retained.
   
 close-port

 -- Scheme Procedure: close-port port
     Close the specified port object.  Return `#t' if it
 successfully
     closes a port or `#f' if it was already
 closed.  An exception
     may be raised if an error occurs, for
 example when flushing
     buffered output.  See also *note close: Ports and File
     Descriptors, for a procedure which can close file
 descriptors.
   
 close-input-port

 -- Scheme Procedure: close-input-port port
     Close the specified input port object.  The routine has no effect
     if
 the file has already been closed.  An exception may be raised
     if an
 error occurs.  The value returned is unspecified.
 
 See
     also *note close: Ports and File Descriptors, for a procedure
     which can close file descriptors.
   
 close-output-port

 -- Scheme Procedure: close-output-port port
     Close the specified output port object.  The routine has no effect
     if
 the file has already been closed.  An exception may be raised
     if an
 error occurs.  The value returned is unspecified.
 
 See
     also *note close: Ports and File Descriptors, for a procedure
     which can close file descriptors.
   
 port-for-each

 -- Scheme Procedure: port-for-each proc
     Apply PROC to each port in the Guile port table
 in turn.  The
     return value is unspecified.  More specifically,
 PROC is applied
     exactly once to every port that exists
 in the system at the time
     PORT-FOR-EACH is invoked.
 Changes to the port table while
     PORT-FOR-EACH is running
 have no effect as far as PORT-FOR-EACH
     is concerned.
   
 input-port?

 -- Scheme Procedure: input-port? x
     Return `#t' if X is an input port, otherwise return
 `#f'.  Any
     object satisfying this predicate also satisfies
 `port?'.
   
 output-port?

 -- Scheme Procedure: output-port? x
     Return `#t' if X is an output port, otherwise return
 `#f'.  Any
     object satisfying this predicate also satisfies
 `port?'.
   
 port?

 -- Scheme Procedure: port? x
     Return a boolean indicating whether X is a port.
 Equivalent to
     `(or (input-port? X) (output-port?
 X))'.
   
 port-closed?

 -- Scheme Procedure: port-closed? port
     Return `#t' if PORT is closed or `#f' if it is
 open.
   
 eof-object?

 -- Scheme Procedure: eof-object? x
     Return `#t' if X is an end-of-file object; otherwise
 return
     `#f'.
   
 force-output

 -- Scheme Procedure: force-output [port]
     Flush the specified output port, or the current output port if
     PORT
 is omitted.  The current output buffer contents are passed
     to the
 underlying port implementation (e.g., in the case of
     fports, the
 data will be written to the file and the output
     buffer will be cleared.)
 It has no effect on an unbuffered
     port.
 
 The return value is unspecified.
   
 flush-all-ports

 -- Scheme Procedure: flush-all-ports
     Equivalent to calling `force-output' on
 all open output ports.
     The return value is unspecified.
   
 read-char

 -- Scheme Procedure: read-char [port]
     Return the next character available from PORT, updating
 PORT to
     point to the following character.  If no more
 characters are
     available, the end-of-file object is returned.
   
 peek-char

 -- Scheme Procedure: peek-char [port]
     Return the next character available from PORT,
 _without_
     updating PORT to point to the following
 character.  If no more
     characters are available, the
 end-of-file object is returned.
     
 The value returned by
 a call to `peek-char' is the same as
     the value that would
 have been returned by a call to `read-char'
     on the same
 port.  The only difference is that the very next
     call to
 `read-char' or `peek-char' on that PORT will
 return
     the value returned by the preceding call to
 `peek-char'.  In
     particular, a call to `peek-char' on
 an interactive port will
     hang waiting for input whenever a call
 to `read-char' would have
     hung.
   
 unread-char

 -- Scheme Procedure: unread-char cobj [port]
     Place CHAR in PORT so that it will be read by the
 next read
     operation.  If called multiple times, the unread characters
 will
     be read again in last-in first-out order.  If PORT is
 not
     supplied, the current input port is used.
   
 unread-string

 -- Scheme Procedure: unread-string str port
     Place the string STR in PORT so that its characters will be
 read
     in subsequent read operations.  If called multiple times, the
     unread characters will be read again in last-in first-out order.
     If
 PORT is not supplied, the current-input-port is used.
   
 seek

 -- Scheme Procedure: seek fd_port offset whence
     Sets the current position of FD/PORT to the integer
 OFFSET,
     which is interpreted according to the value of
 WHENCE.
 
 One
     of the following variables should be supplied for
 WHENCE:

      -- Variable: SEEK_SET
          Seek from the beginning of the file.

      -- Variable: SEEK_CUR
          Seek from the current position.

      -- Variable: SEEK_END
          Seek from the end of the file.
     If FD/PORT is a file descriptor, the underlying system
 call is
     `lseek'.  PORT may be a string port.
 
 The value returned is
     the new position in the file.  This means
 that the current
     position of a port can be obtained using:
          (seek port 0 SEEK_CUR)

 truncate-file

 -- Scheme Procedure: truncate-file object [length]
     Truncate FILE to LENGTH bytes.  FILE can be a
 filename string, a
     port object, or an integer file descriptor.
 The return value is
     unspecified.
 
 For a port or file descriptor LENGTH can be
     omitted, in
 which case the file is truncated at the current
     position (per
 `ftell' above).
 
 On most systems a file can be
     extended by giving a length
 greater than the current size, but
     this is not mandatory in the
 POSIX standard.
   
 port-line

 -- Scheme Procedure: port-line port
     Return the current line number for PORT.
 
 The first line of a
     file is 0.  But you might want to add 1
 when printing line
     numbers, since starting from 1 is
 traditional in error messages,
     and likely to be more natural to
 non-programmers.
   
 set-port-line!

 -- Scheme Procedure: set-port-line! port line
     Set the current line number for PORT to LINE.  The
 first line of
     a file is 0.
   
 port-column

 -- Scheme Procedure: port-column port
     Return the current column number of PORT.
 If the number is
     unknown, the result is #f.  Otherwise, the result is a 0-origin
     integer
 - i.e. the first character of the first line is line 0,
     column 0.
 (However, when you display a file position, for
     example in an error
 message, we recommend you add 1 to get
     1-origin integers.  This is
 because lines and column numbers
     traditionally start with 1, and that is
 what non-programmers
     will find most natural.)
   
 set-port-column!

 -- Scheme Procedure: set-port-column! port column
     Set the current column of PORT.  Before reading the first
     character on a line the column should be 0.
   
 port-filename

 -- Scheme Procedure: port-filename port
     Return the filename associated with PORT.  This function returns
     the strings "standard input", "standard output" and "standard
     error"
 when called on the current input, output and error ports
     respectively.
   
 set-port-filename!

 -- Scheme Procedure: set-port-filename! port filename
     Change the filename associated with PORT, using the current input
     port if none is specified.  Note that this does not change the
     port's
 source of data, but only the value that is returned by
     `port-filename' and reported in diagnostic output.
   
 %make-void-port

 -- Scheme Procedure: %make-void-port mode
     Create and return a new void port.  A void port acts like
     `/dev/null'.  The MODE argument
 specifies the input/output modes
     for this port: see the
 documentation for `open-file' in *note
     File Ports::.
   
 print-options-interface

 -- Scheme Procedure: print-options-interface [setting]
     Option interface for the print options. Instead of using
 this
     procedure directly, use the procedures
 `print-enable',
     `print-disable', `print-set!'
 and `print-options'.
   
 simple-format

 -- Scheme Procedure: simple-format destination message . args
     Write MESSAGE to DESTINATION, defaulting to
 the current output
     port.
 MESSAGE can contain `~A' (was `%s') and
 `~S' (was `%S')
     escapes.  When printed,
 the escapes are replaced with
     corresponding members of
 ARGS:
 `~A' formats using `display'
     and `~S' formats
 using `write'.
 If DESTINATION is `#t', then
     use the current output
 port, if DESTINATION is `#f', then return
     a string
 containing the formatted text. Does not add a trailing
     newline.
   
 newline

 -- Scheme Procedure: newline [port]
     Send a newline to PORT.
 If PORT is omitted, send to the current
     output port.
   
 write-char

 -- Scheme Procedure: write-char chr [port]
     Send character CHR to PORT.
   
 port-with-print-state

 -- Scheme Procedure: port-with-print-state port [pstate]
     Create a new port which behaves like PORT, but with an
 included
     print state PSTATE.  PSTATE is optional.
 If PSTATE isn't
     supplied and PORT already has
 a print state, the old print state
     is reused.
   
 get-print-state

 -- Scheme Procedure: get-print-state port
     Return the print state of the port PORT. If PORT
 has no
     associated print state, `#f' is returned.
   
 procedure-properties

 -- Scheme Procedure: procedure-properties proc
     Return OBJ's property list.
   
 set-procedure-properties!

 -- Scheme Procedure: set-procedure-properties! proc new_val
     Set OBJ's property list to ALIST.
   
 procedure-property

 -- Scheme Procedure: procedure-property p k
     Return the property of OBJ with name KEY.
   
 set-procedure-property!

 -- Scheme Procedure: set-procedure-property! p k v
     In OBJ's property list, set the property named KEY to
 VALUE.
   
 procedure?

 -- Scheme Procedure: procedure? obj
     Return `#t' if OBJ is a procedure.
   
 closure?

 -- Scheme Procedure: closure? obj
     Return `#t' if OBJ is a closure.
   
 thunk?

 -- Scheme Procedure: thunk? obj
     Return `#t' if OBJ is a thunk.
   
 procedure-documentation

 -- Scheme Procedure: procedure-documentation proc
     Return the documentation string associated with `proc'.  By
     convention, if a procedure contains more than one expression and
     the
 first expression is a string constant, that string is
     assumed to contain
 documentation for that procedure.
   
 procedure-with-setter?

 -- Scheme Procedure: procedure-with-setter? obj
     Return `#t' if OBJ is a procedure with an
 associated setter
     procedure.
   
 make-procedure-with-setter

 -- Scheme Procedure: make-procedure-with-setter procedure setter
     Create a new procedure which behaves like PROCEDURE, but
 with
     the associated setter SETTER.
   
 procedure

 -- Scheme Procedure: procedure proc
     Return the procedure of PROC, which must be either a
 procedure
     with setter, or an operator struct.
   
 primitive-make-property

 -- Scheme Procedure: primitive-make-property not_found_proc
     Create a "property token" that can be used with
     `primitive-property-ref' and `primitive-property-set!'.
 See
     `primitive-property-ref' for the significance of
     NOT_FOUND_PROC.
   
 primitive-property-ref

 -- Scheme Procedure: primitive-property-ref prop obj
     Return the property PROP of OBJ.
 
 When no value has yet been
     associated with PROP and
 OBJ, the NOT-FOUND-PROC from PROP is
     used.  A
 call `(NOT-FOUND-PROC PROP OBJ)' is made
 and the
     result set as the property value.  If
 NOT-FOUND-PROC is `#f'
     then `#f' is the
 property value.
   
 primitive-property-set!

 -- Scheme Procedure: primitive-property-set! prop obj val
     Set the property PROP of OBJ to VAL.
   
 primitive-property-del!

 -- Scheme Procedure: primitive-property-del! prop obj
     Remove any value associated with PROP and OBJ.
   
 random

 -- Scheme Procedure: random n [state]
     Return a number in [0, N).
 
 Accepts a positive integer or real
     n and returns a
 number of the same type between zero (inclusive)
     and
 N (exclusive). The values returned have a uniform
     distribution.
 
 The optional argument STATE must be of the type
     produced
 by `seed->random-state'. It defaults to the value of
     the
 variable *RANDOM-STATE*. This object is used to maintain
     the state of the pseudo-random-number generator and is altered
     as a side effect of the random operation.
   
 copy-random-state

 -- Scheme Procedure: copy-random-state [state]
     Return a copy of the random state STATE.
   
 seed->random-state

 -- Scheme Procedure: seed->random-state seed
     Return a new random state using SEED.
   
 random:uniform

 -- Scheme Procedure: random:uniform [state]
     Return a uniformly distributed inexact real random number in
     [0,1).
   
 random:normal

 -- Scheme Procedure: random:normal [state]
     Return an inexact real in a normal distribution.  The
     distribution used has mean 0 and standard deviation 1.  For a
     normal distribution with mean m and standard deviation d use
 `(+
     m (* d (random:normal)))'.
   
 random:solid-sphere!

 -- Scheme Procedure: random:solid-sphere! v [state]
     Fills VECT with inexact real random numbers the sum of
 whose
     squares is less than 1.0.  Thinking of VECT as
 coordinates in
     space of dimension N =
 `(vector-length VECT)', the coordinates
     are
 uniformly distributed within the unit N-sphere.
   
 random:hollow-sphere!

 -- Scheme Procedure: random:hollow-sphere! v [state]
     Fills vect with inexact real random numbers
 the sum of whose
     squares is equal to 1.0.
 Thinking of vect as coordinates in
     space of
 dimension n = (vector-length vect), the coordinates
     are uniformly distributed over the surface of the
 unit
     n-sphere.
   
 random:normal-vector!

 -- Scheme Procedure: random:normal-vector! v [state]
     Fills vect with inexact real random numbers that are
 independent
     and standard normally distributed
 (i.e., with mean 0 and
     variance 1).
   
 random:exp

 -- Scheme Procedure: random:exp [state]
     Return an inexact real in an exponential distribution with mean
     1.  For an exponential distribution with mean u use (* u
     (random:exp)).
   
 %read-delimited!

 -- Scheme Procedure: %read-delimited! delims str gobble [port [start
          [end]]]
     Read characters from PORT into STR until one of the
 characters
     in the DELIMS string is encountered.  If
 GOBBLE is true, discard
     the delimiter character;
 otherwise, leave it in the input stream
     for the next read.  If
 PORT is not specified, use the value of
     `(current-input-port)'.  If START or END are
 specified, store
     data only into the substring of STR
 bounded by START and END
     (which default to the
 beginning and end of the string,
     respectively).
 
  Return a pair consisting of the delimiter
     that terminated the
 string and the number of characters read.
     If reading stopped
 at the end of file, the delimiter returned is
     the
 EOF-OBJECT; if the string was filled without encountering
     a delimiter, this value is `#f'.
   
 %read-line

 -- Scheme Procedure: %read-line [port]
     Read a newline-terminated line from PORT, allocating storage as
     necessary.  The newline terminator (if any) is removed from the
     string,
 and a pair consisting of the line and its delimiter is
     returned.  The
 delimiter may be either a newline or the
     EOF-OBJECT; if
 `%read-line' is called at the end of file, it
     returns the pair
 `(#<eof> . #<eof>)'.
   
 write-line

 -- Scheme Procedure: write-line obj [port]
     Display OBJ and a newline character to PORT.  If
 PORT is not
     specified, `(current-output-port)' is
 used.  This function is
     equivalent to:
          (display obj [port])
          (newline [port])

 read-options-interface

 -- Scheme Procedure: read-options-interface [setting]
     Option interface for the read options. Instead of using
 this
     procedure directly, use the procedures `read-enable',
     `read-disable', `read-set!' and `read-options'.
   
 read

 -- Scheme Procedure: read [port]
     Read an s-expression from the input port PORT, or from
 the
     current input port if PORT is not specified.
 Any whitespace
     before the next token is discarded.
   
 read-hash-extend

 -- Scheme Procedure: read-hash-extend chr proc
     Install the procedure PROC for reading expressions
 starting with
     the character sequence `#' and CHR.
 PROC will be called with two
     arguments:  the character
 CHR and the port to read further data
     from. The object
 returned will be the return value of `read'.
   
 call-with-dynamic-root

 -- Scheme Procedure: call-with-dynamic-root thunk handler
     Call THUNK with a new dynamic state and withina continuation
     barrier.  The HANDLER catches allotherwise uncaught throws and
     executes within the samedynamic context as THUNK.
   
 dynamic-root

 -- Scheme Procedure: dynamic-root
     Return an object representing the current dynamic root.
 
 These
     objects are only useful for comparison using `eq?'.
 
   
 read-string!/partial

 -- Scheme Procedure: read-string!/partial str [port_or_fdes [start
          [end]]]
     Read characters from a port or file descriptor into a
 string
     STR.  A port must have an underlying file
 descriptor -- a
     so-called fport.  This procedure is
 scsh-compatible and can
     efficiently read large strings.
 It will:
 
        * attempt to fill the entire string, unless the START
 and/or
          END arguments are supplied.  i.e., START
 defaults to 0 and
          END defaults to
 `(string-length str)'

        * use the current input port if PORT_OR_FDES is not
          supplied.

        * return fewer than the requested number of characters in some
          cases, e.g., on end of file, if interrupted by a signal, or
          if
 not all the characters are immediately available.

        * wait indefinitely for some input if no characters are
          currently available,
 unless the port is in non-blocking
          mode.

        * read characters from the port's input buffers if available,
          instead from the underlying file descriptor.

        * return `#f' if end-of-file is encountered before reading
          any characters, otherwise return the number of characters
          read.

        * return 0 if the port is in non-blocking mode and no
          characters
 are immediately available.

        * return 0 if the request is for 0 bytes, with no
 end-of-file
          check.

 write-string/partial

 -- Scheme Procedure: write-string/partial str [port_or_fdes [start
          [end]]]
     Write characters from a string STR to a port or file
 descriptor.
     A port must have an underlying file descriptor
 -- a so-called
     fport.  This procedure is
 scsh-compatible and can efficiently
     write large strings.
 It will:
 
        * attempt to write the entire string, unless the START
 and/or
          END arguments are supplied.  i.e., START
 defaults to 0 and
          END defaults to
 `(string-length str)'

        * use the current output port if PORT_OF_FDES is not
          supplied.

        * in the case of a buffered port, store the characters in the
          port's output buffer, if all will fit.  If they will not fit
          then any existing buffered characters will be flushed
          before attempting
 to write the new characters directly to
          the underlying file
 descriptor.  If the port is in
          non-blocking mode and
 buffered characters can not be
          flushed immediately, then an
 `EAGAIN' system-error
          exception will be raised (Note:
 scsh does not support the
          use of non-blocking buffered ports.)

        * write fewer than the requested number of
 characters in some
          cases, e.g., if interrupted by a signal or
 if not all of
          the output can be accepted immediately.

        * wait indefinitely for at least one character
 from STR to be
          accepted by the port, unless the port is
 in non-blocking
          mode.

        * return the number of characters accepted by the port.

        * return 0 if the port is in non-blocking mode and can not
          accept
 at least one character from STR immediately

        * return 0 immediately if the request size is 0 bytes.

 sigaction

 -- Scheme Procedure: sigaction signum [handler [flags [thread]]]
     Install or report the signal handler for a specified signal.
 
     SIGNUM is the signal number, which can be specified using the
     value
 of variables such as `SIGINT'.
 
 If HANDLER is omitted,
     `sigaction' returns a pair: the
 CAR is the current
 signal
     hander, which will be either an integer with the value `SIG_DFL'
     (default action) or `SIG_IGN' (ignore), or the Scheme procedure
     which
 handles the signal, or `#f' if a non-Scheme procedure
     handles the
 signal.  The CDR contains the current `sigaction'
     flags for the handler.
 
 If HANDLER is provided, it is
     installed as the new handler for
 SIGNUM.  HANDLER can be a
     Scheme procedure taking one
 argument, or the value of `SIG_DFL'
     (default action) or
 `SIG_IGN' (ignore), or `#f' to restore
     whatever signal handler
 was installed before `sigaction' was
     first used.  When
 a scheme procedure has been specified, that
     procedure will run
 in the given THREAD.   When no thread has
     been given, the
 thread that made this call to `sigaction' is
     used.
 Flags can optionally be specified for the new handler.
     The return value is a pair with information about the
 old
     handler as described above.
 
 This interface does not provide
     access to the "signal blocking"
 facility.  Maybe this is not
     needed, since the thread support may
 provide solutions to the
     problem of consistent access to data
 structures.
   
 restore-signals

 -- Scheme Procedure: restore-signals
     Return all signal handlers to the values they had before any call
     to
 `sigaction' was made.  The return value is unspecified.
   
 alarm

 -- Scheme Procedure: alarm i
     Set a timer to raise a `SIGALRM' signal after the specified
     number of seconds (an integer).  It's advisable to install a
     signal
 handler for
 `SIGALRM' beforehand, since the default
     action is to terminate
 the process.
 
 The return value
     indicates the time remaining for the previous alarm,
 if any.
     The new value replaces the previous alarm.  If there was
 no
     previous alarm, the return value is zero.
   
 sleep

 -- Scheme Procedure: sleep i
     Wait for the given number of seconds (an integer) or until a
     signal
 arrives.  The return value is zero if the time elapses or
     the number
 of seconds remaining otherwise.
 
 See also
     `usleep'.
   
 usleep

 -- Scheme Procedure: usleep i
     Wait the given period USECS microseconds (an integer).
 If a
     signal arrives the wait stops and the return value is the
 time
     remaining, in microseconds.  If the period elapses with no
     signal the return is zero.
 
 On most systems the process
     scheduler is not microsecond accurate and
 the actual period
     slept by `usleep' may be rounded to a system
 clock tick
     boundary.  Traditionally such ticks were 10 milliseconds
 apart,
     and that interval is often still used.
 
 See also `sleep'.
   
 raise

 -- Scheme Procedure: raise sig
     Sends a specified signal SIG to the current process, where
 SIG
     is as described for the kill procedure.
   
 system

 -- Scheme Procedure: system [cmd]
     Execute CMD using the operating system's "command
 processor".
     Under Unix this is usually the default shell
 `sh'.  The value
     returned is CMD's exit status as
 returned by `waitpid', which
     can be interpreted using
 `status:exit-val' and friends.
 
 If
     `system' is called without arguments, return a boolean
     indicating whether the command processor is available.
   
 getenv

 -- Scheme Procedure: getenv nam
     Looks up the string NAME in the current environment.  The return
     value is `#f' unless a string of the form `NAME=VALUE' is
 found,
     in which case the string `VALUE' is returned.
   
 primitive-exit

 -- Scheme Procedure: primitive-exit [status]
     Terminate the current process without unwinding the Scheme
     stack.  The exit status is STATUS if supplied, otherwise
 zero.
   
 primitive-_exit

 -- Scheme Procedure: primitive-_exit [status]
     Terminate the current process using the _exit() system call and
     without unwinding the Scheme stack.  The exit status is
 STATUS
     if supplied, otherwise zero.
 
 This function is typically
     useful after a fork, to ensure no
 Scheme cleanups or `atexit'
     handlers are run (those
 usually belonging in the parent rather
     than the child).
   
 restricted-vector-sort!

 -- Scheme Procedure: restricted-vector-sort! vec less startpos endpos
     Sort the vector VEC, using LESS for comparing
 the vector
     elements.  STARTPOS (inclusively) and
 ENDPOS (exclusively)
     delimit
 the range of the vector which gets sorted.  The return
     value
 is not specified.
   
 sorted?

 -- Scheme Procedure: sorted? items less
     Return `#t' iff ITEMS is a list or a vector such that
 for all 1
     <= i <= m, the predicate LESS returns true when
 applied to all
     elements i - 1 and i
   
 merge

 -- Scheme Procedure: merge alist blist less
     Merge two already sorted lists into one.
 Given two lists ALIST
     and BLIST, such that
 `(sorted? alist less?)' and `(sorted? blist
     less?)',
 return a new list in which the elements of ALIST and
     BLIST have been stably interleaved so that
 `(sorted? (merge
     alist blist less?) less?)'.
 Note:  this does _not_ accept
     vectors.
   
 merge!

 -- Scheme Procedure: merge! alist blist less
     Takes two lists ALIST and BLIST such that
 `(sorted? alist
     less?)' and `(sorted? blist less?)' and
 returns a new list in
     which the elements of ALIST and
 BLIST have been stably
     interleaved so that
  `(sorted? (merge alist blist less?)
     less?)'.
 This is the destructive variant of `merge'
 Note:
     this does _not_ accept vectors.
   
 sort!

 -- Scheme Procedure: sort! items less
     Sort the sequence ITEMS, which may be a list or a
 vector.  LESS
     is used for comparing the sequence
 elements.  The sorting is
     destructive, that means that the
 input sequence is modified to
     produce the sorted result.
 This is not a stable sort.
   
 sort

 -- Scheme Procedure: sort items less
     Sort the sequence ITEMS, which may be a list or a
 vector.  LESS
     is used for comparing the sequence
 elements.  This is not a
     stable sort.
   
 stable-sort!

 -- Scheme Procedure: stable-sort! items less
     Sort the sequence ITEMS, which may be a list or a
 vector. LESS
     is used for comparing the sequence elements.
 The sorting is
     destructive, that means that the input sequence
 is modified to
     produce the sorted result.
 This is a stable sort.
   
 stable-sort

 -- Scheme Procedure: stable-sort items less
     Sort the sequence ITEMS, which may be a list or a
 vector. LESS
     is used for comparing the sequence elements.
 This is a stable
     sort.
   
 sort-list!

 -- Scheme Procedure: sort-list! items less
     Sort the list ITEMS, using LESS for comparing the
 list elements.
     The sorting is destructive, that means that the
 input list is
     modified to produce the sorted result.
 This is a stable sort.
   
 sort-list

 -- Scheme Procedure: sort-list items less
     Sort the list ITEMS, using LESS for comparing the
 list elements.
     This is a stable sort.
   
 source-properties

 -- Scheme Procedure: source-properties obj
     Return the source property association list of OBJ.
   
 set-source-properties!

 -- Scheme Procedure: set-source-properties! obj plist
     Install the association list PLIST as the source property
 list
     for OBJ.
   
 source-property

 -- Scheme Procedure: source-property obj key
     Return the source property specified by KEY from
 OBJ's source
     property list.
   
 set-source-property!

 -- Scheme Procedure: set-source-property! obj key datum
     Set the source property of object OBJ, which is specified by
 KEY
     to DATUM.  Normally, the key will be a symbol.
   
 %get-stack-size

 -- Scheme Procedure: %get-stack-size
     Return the current thread's C stack size (in Scheme objects).
   
 stack?

 -- Scheme Procedure: stack? obj
     Return `#t' if OBJ is a calling stack.
   
 make-stack

 -- Scheme Procedure: make-stack obj . args
     Create a new stack. If OBJ is `#t', the current
 evaluation stack
     is used for creating the stack frames,
 otherwise the frames are
     taken from OBJ (which must be
 either a debug object or a
     continuation).
 
 ARGS should be a list containing any
     combination of
 integer, procedure and `#t' values.
 
 These
     values specify various ways of cutting away uninteresting
 stack
     frames from the top and bottom of the stack that
 `make-stack'
     returns.  They come in pairs like this:
 `(INNER_CUT_1
     OUTER_CUT_1 INNER_CUT_2
 OUTER_CUT_2 ...)'.
 
 Each INNER_CUT_N
     can be `#t', an integer, or a
 procedure.  `#t' means to cut away
     all frames up to but
 excluding the first user module frame.  An
     integer means to cut
 away exactly that number of frames.  A
     procedure means to cut
 away all frames up to but excluding the
     application frame whose
 procedure matches the specified one.
 
     Each OUTER_CUT_N can be an integer or a procedure.  An
 integer
     means to cut away that number of frames.  A procedure
 means to
     cut away frames down to but excluding the application
 frame
     whose procedure matches the specified one.
 
 If the OUTER_CUT_N
     of the last pair is missing, it is
 taken as 0.
   
 stack-id

 -- Scheme Procedure: stack-id stack
     Return the identifier given to STACK by `start-stack'.
   
 stack-ref

 -- Scheme Procedure: stack-ref stack index
     Return the INDEX'th frame from STACK.
   
 stack-length

 -- Scheme Procedure: stack-length stack
     Return the length of STACK.
   
 frame?

 -- Scheme Procedure: frame? obj
     Return `#t' if OBJ is a stack frame.
   
 last-stack-frame

 -- Scheme Procedure: last-stack-frame obj
     Return a stack which consists of a single frame, which is the
     last stack frame for OBJ. OBJ must be either a
 debug object or a
     continuation.
   
 frame-number

 -- Scheme Procedure: frame-number frame
     Return the frame number of FRAME.
   
 frame-source

 -- Scheme Procedure: frame-source frame
     Return the source of FRAME.
   
 frame-procedure

 -- Scheme Procedure: frame-procedure frame
     Return the procedure for FRAME, or `#f' if no
 procedure is
     associated with FRAME.
   
 frame-arguments

 -- Scheme Procedure: frame-arguments frame
     Return the arguments of FRAME.
   
 frame-previous

 -- Scheme Procedure: frame-previous frame
     Return the previous frame of FRAME, or `#f' if
 FRAME is the
     first frame in its stack.
   
 frame-next

 -- Scheme Procedure: frame-next frame
     Return the next frame of FRAME, or `#f' if
 FRAME is the last
     frame in its stack.
   
 frame-real?

 -- Scheme Procedure: frame-real? frame
     Return `#t' if FRAME is a real frame.
   
 frame-procedure?

 -- Scheme Procedure: frame-procedure? frame
     Return `#t' if a procedure is associated with FRAME.
   
 frame-evaluating-args?

 -- Scheme Procedure: frame-evaluating-args? frame
     Return `#t' if FRAME contains evaluated arguments.
   
 frame-overflow?

 -- Scheme Procedure: frame-overflow? frame
     Return `#t' if FRAME is an overflow frame.
   
 get-internal-real-time

 -- Scheme Procedure: get-internal-real-time
     Return the number of time units since the interpreter was
     started.
   
 get-internal-run-time

 -- Scheme Procedure: get-internal-run-time
     Return the number of time units of processor time used by the
     interpreter.  Both _system_ and _user_ time are
 included but
     subprocesses are not.
   
 current-time

 -- Scheme Procedure: current-time
     Return the number of seconds since 1970-01-01 00:00:00 UTC,
     excluding leap seconds.
   
 gettimeofday

 -- Scheme Procedure: gettimeofday
     Return a pair containing the number of seconds and microseconds
     since 1970-01-01 00:00:00 UTC, excluding leap seconds.  Note:
     whether true microsecond resolution is available depends on the
     operating system.
   
 localtime

 -- Scheme Procedure: localtime time [zone]
     Return an object representing the broken down components of
     TIME, an integer like the one returned by
 `current-time'.  The
     time zone for the calculation is
 optionally specified by ZONE (a
     string), otherwise the
 `TZ' environment variable or the system
     default is used.
   
 gmtime

 -- Scheme Procedure: gmtime time
     Return an object representing the broken down components of
     TIME, an integer like the one returned by
 `current-time'.  The
     values are calculated for UTC.
   
 mktime

 -- Scheme Procedure: mktime sbd_time [zone]
     BD-TIME is an object representing broken down time and `zone'
 is
     an optional time zone specifier (otherwise the TZ environment
     variable
 or the system default is used).
 
 Returns a pair:
     the car is a corresponding
 integer time value like that
     returned
 by `current-time'; the cdr is a broken down time
     object, similar to
 as BD-TIME but with normalized values.
   
 tzset

 -- Scheme Procedure: tzset
     Initialize the timezone from the TZ environment variable
 or the
     system default.  It's not usually necessary to call this
     procedure
 since it's done automatically by other procedures that
     depend on the
 timezone.
   
 strftime

 -- Scheme Procedure: strftime format stime
     Return a string which is broken-down time structure STIME
     formatted according to the given FORMAT string.
 
 FORMAT
     contains field specifications introduced by a
 `%' character.
     See *note Formatting Calendar Time: (libc)Formatting Calendar
     Time, or `man 3 strftime',
 for the available formatting.
 
          (strftime "%c" (localtime (current-time)))
          => "Mon Mar 11 20:17:43 2002"
     
 If `setlocale' has been called (*note Locales::), month
 and
     day names are from the current locale and in the locale
     character set.
   
 string?

 -- Scheme Procedure: string? obj
     Return `#t' if OBJ is a string, else `#f'.
   
 list->string

 -- Scheme Procedure: list->string
     implemented by the C function "scm_string"
   
 string

 -- Scheme Procedure: string . chrs
 -- Scheme Procedure: list->string chrs
     Return a newly allocated string composed of the arguments,
     CHRS.
   
 make-string

 -- Scheme Procedure: make-string k [chr]
     Return a newly allocated string of
 length K.  If CHR is given,
     then all elements of
 the string are initialized to CHR,
     otherwise the contents
 of the STRING are unspecified.
   
 string-length

 -- Scheme Procedure: string-length string
     Return the number of characters in STRING.
   
 string-ref

 -- Scheme Procedure: string-ref str k
     Return character K of STR using zero-origin
 indexing. K must be
     a valid index of STR.
   
 string-set!

 -- Scheme Procedure: string-set! str k chr
     Store CHR in element K of STR and return
 an unspecified value. K
     must be a valid index of
 STR.
   
 substring

 -- Scheme Procedure: substring str start [end]
     Return a newly allocated string formed from the characters
 of
     STR beginning with index START (inclusive) and
 ending with index
     END (exclusive).
 STR must be a string, START and END must be
     exact integers satisfying:
 
 0 <= START <= END <=
     (string-length STR).
   
 substring/read-only

 -- Scheme Procedure: substring/read-only str start [end]
     Return a newly allocated string formed from the characters
 of
     STR beginning with index START (inclusive) and
 ending with index
     END (exclusive).
 STR must be a string, START and END must be
     exact integers satisfying:
 
 0 <= START <= END <=
     (string-length STR).
 
 The returned string is read-only.
 
   
 substring/copy

 -- Scheme Procedure: substring/copy str start [end]
     Return a newly allocated string formed from the characters
 of
     STR beginning with index START (inclusive) and
 ending with index
     END (exclusive).
 STR must be a string, START and END must be
     exact integers satisfying:
 
 0 <= START <= END <=
     (string-length STR).
   
 substring/shared

 -- Scheme Procedure: substring/shared str start [end]
     Return string that indirectly refers to the characters
 of STR
     beginning with index START (inclusive) and
 ending with index END
     (exclusive).
 STR must be a string, START and END must be
 exact
     integers satisfying:
 
 0 <= START <= END <= (string-length
     STR).
   
 string-append

 -- Scheme Procedure: string-append . args
     Return a newly allocated string whose characters form the
     concatenation of the given strings, ARGS.
   
 uniform-vector?

 -- Scheme Procedure: uniform-vector? obj
     Return `#t' if OBJ is a uniform vector.
   
 uniform-vector-ref

 -- Scheme Procedure: uniform-vector-ref v idx
     Return the element at index IDX of the
 homogenous numeric vector
     V.
   
 uniform-vector-set!

 -- Scheme Procedure: uniform-vector-set! v idx val
     Set the element at index IDX of the
 homogenous numeric vector V
     to VAL.
   
 uniform-vector->list

 -- Scheme Procedure: uniform-vector->list uvec
     Convert the uniform numeric vector UVEC to a list.
   
 uniform-vector-length

 -- Scheme Procedure: uniform-vector-length v
     Return the number of elements in the uniform vector V.
   
 uniform-vector-read!

 -- Scheme Procedure: uniform-vector-read! uvec [port_or_fd [start
          [end]]]
     Fill the elements of UVEC by reading
 raw bytes from
     PORT-OR-FDES, using host byte order.
 
 The optional arguments
     START (inclusive) and END
 (exclusive) allow a specified region
     to be read,
 leaving the remainder of the vector unchanged.
 
     When PORT-OR-FDES is a port, all specified elements
 of UVEC are
     attempted to be read, potentially blocking
 while waiting formore
     input or end-of-file.
 When PORT-OR-FD is an integer, a single
     call to
 read(2) is made.
 
 An error is signalled when the
     last element has only
 been partially filled before reaching
     end-of-file or in
 the single call to read(2).
 
     `uniform-vector-read!' returns the number of elements
 read.
 
     PORT-OR-FDES may be omitted, in which case it defaults
 to the
     value returned by `(current-input-port)'.
   
 uniform-vector-write

 -- Scheme Procedure: uniform-vector-write uvec [port_or_fd [start
          [end]]]
     Write the elements of UVEC as raw bytes to
 PORT-OR-FDES, in the
     host byte order.
 
 The optional arguments START (inclusive)
     and END (exclusive) allow
 a specified region to be written.
 
     When PORT-OR-FDES is a port, all specified elements
 of UVEC are
     attempted to be written, potentially blocking
 while waiting for
     more room.
 When PORT-OR-FD is an integer, a single call to
     write(2) is made.
 
 An error is signalled when the last element
     has only
 been partially written in the single call to write(2).
     
 The number of objects actually written is returned.
     PORT-OR-FDES may be
 omitted, in which case it defaults to the
     value returned by
 `(current-output-port)'.
   
 u8vector?

 -- Scheme Procedure: u8vector? obj
     Return `#t' if OBJ is a vector of type u8,
 `#f' otherwise.
   
 make-u8vector

 -- Scheme Procedure: make-u8vector len [fill]
     Return a newly allocated uniform numeric vector which can
 hold
     LEN elements.  If FILL is given, it is used to
 initialize the
     elements, otherwise the contents of the vector
 is unspecified.
   
 u8vector

 -- Scheme Procedure: u8vector . l
     Return a newly allocated uniform numeric vector containing
 all
     argument values.
   
 u8vector-length

 -- Scheme Procedure: u8vector-length uvec
     Return the number of elements in the uniform numeric vector
     UVEC.
   
 u8vector-ref

 -- Scheme Procedure: u8vector-ref uvec index
     Return the element at INDEX in the uniform numeric
 vector UVEC.
   
 u8vector-set!

 -- Scheme Procedure: u8vector-set! uvec index value
     Set the element at INDEX in the uniform numeric
 vector UVEC to
     VALUE.  The return value is not
 specified.
   
 u8vector->list

 -- Scheme Procedure: u8vector->list uvec
     Convert the uniform numeric vector UVEC to a list.
   
 list->u8vector

 -- Scheme Procedure: list->u8vector l
     Convert the list L to a numeric uniform vector.
   
 any->u8vector

 -- Scheme Procedure: any->u8vector obj
     Convert OBJ, which can be a list, vector, or
 uniform vector, to
     a numeric uniform vector of
 type u8.
   
 s8vector?

 -- Scheme Procedure: s8vector? obj
     Return `#t' if OBJ is a vector of type s8,
 `#f' otherwise.
   
 make-s8vector

 -- Scheme Procedure: make-s8vector len [fill]
     Return a newly allocated uniform numeric vector which can
 hold
     LEN elements.  If FILL is given, it is used to
 initialize the
     elements, otherwise the contents of the vector
 is unspecified.
   
 s8vector

 -- Scheme Procedure: s8vector . l
     Return a newly allocated uniform numeric vector containing
 all
     argument values.
   
 s8vector-length

 -- Scheme Procedure: s8vector-length uvec
     Return the number of elements in the uniform numeric vector
     UVEC.
   
 s8vector-ref

 -- Scheme Procedure: s8vector-ref uvec index
     Return the element at INDEX in the uniform numeric
 vector UVEC.
   
 s8vector-set!

 -- Scheme Procedure: s8vector-set! uvec index value
     Set the element at INDEX in the uniform numeric
 vector UVEC to
     VALUE.  The return value is not
 specified.
   
 s8vector->list

 -- Scheme Procedure: s8vector->list uvec
     Convert the uniform numeric vector UVEC to a list.
   
 list->s8vector

 -- Scheme Procedure: list->s8vector l
     Convert the list L to a numeric uniform vector.
   
 any->s8vector

 -- Scheme Procedure: any->s8vector obj
     Convert OBJ, which can be a list, vector, or
 uniform vector, to
     a numeric uniform vector of
 type s8.
   
 u16vector?

 -- Scheme Procedure: u16vector? obj
     Return `#t' if OBJ is a vector of type u16,
 `#f' otherwise.
   
 make-u16vector

 -- Scheme Procedure: make-u16vector len [fill]
     Return a newly allocated uniform numeric vector which can
 hold
     LEN elements.  If FILL is given, it is used to
 initialize the
     elements, otherwise the contents of the vector
 is unspecified.
   
 u16vector

 -- Scheme Procedure: u16vector . l
     Return a newly allocated uniform numeric vector containing
 all
     argument values.
   
 u16vector-length

 -- Scheme Procedure: u16vector-length uvec
     Return the number of elements in the uniform numeric vector
     UVEC.
   
 u16vector-ref

 -- Scheme Procedure: u16vector-ref uvec index
     Return the element at INDEX in the uniform numeric
 vector UVEC.
   
 u16vector-set!

 -- Scheme Procedure: u16vector-set! uvec index value
     Set the element at INDEX in the uniform numeric
 vector UVEC to
     VALUE.  The return value is not
 specified.
   
 u16vector->list

 -- Scheme Procedure: u16vector->list uvec
     Convert the uniform numeric vector UVEC to a list.
   
 list->u16vector

 -- Scheme Procedure: list->u16vector l
     Convert the list L to a numeric uniform vector.
   
 any->u16vector

 -- Scheme Procedure: any->u16vector obj
     Convert OBJ, which can be a list, vector, or
 uniform vector, to
     a numeric uniform vector of
 type u16.
   
 s16vector?

 -- Scheme Procedure: s16vector? obj
     Return `#t' if OBJ is a vector of type s16,
 `#f' otherwise.
   
 make-s16vector

 -- Scheme Procedure: make-s16vector len [fill]
     Return a newly allocated uniform numeric vector which can
 hold
     LEN elements.  If FILL is given, it is used to
 initialize the
     elements, otherwise the contents of the vector
 is unspecified.
   
 s16vector

 -- Scheme Procedure: s16vector . l
     Return a newly allocated uniform numeric vector containing
 all
     argument values.
   
 s16vector-length

 -- Scheme Procedure: s16vector-length uvec
     Return the number of elements in the uniform numeric vector
     UVEC.
   
 s16vector-ref

 -- Scheme Procedure: s16vector-ref uvec index
     Return the element at INDEX in the uniform numeric
 vector UVEC.
   
 s16vector-set!

 -- Scheme Procedure: s16vector-set! uvec index value
     Set the element at INDEX in the uniform numeric
 vector UVEC to
     VALUE.  The return value is not
 specified.
   
 s16vector->list

 -- Scheme Procedure: s16vector->list uvec
     Convert the uniform numeric vector UVEC to a list.
   
 list->s16vector

 -- Scheme Procedure: list->s16vector l
     Convert the list L to a numeric uniform vector.
   
 any->s16vector

 -- Scheme Procedure: any->s16vector obj
     Convert OBJ, which can be a list, vector, or
 uniform vector, to
     a numeric uniform vector of
 type s16.
   
 u32vector?

 -- Scheme Procedure: u32vector? obj
     Return `#t' if OBJ is a vector of type u32,
 `#f' otherwise.
   
 make-u32vector

 -- Scheme Procedure: make-u32vector len [fill]
     Return a newly allocated uniform numeric vector which can
 hold
     LEN elements.  If FILL is given, it is used to
 initialize the
     elements, otherwise the contents of the vector
 is unspecified.
   
 u32vector

 -- Scheme Procedure: u32vector . l
     Return a newly allocated uniform numeric vector containing
 all
     argument values.
   
 u32vector-length

 -- Scheme Procedure: u32vector-length uvec
     Return the number of elements in the uniform numeric vector
     UVEC.
   
 u32vector-ref

 -- Scheme Procedure: u32vector-ref uvec index
     Return the element at INDEX in the uniform numeric
 vector UVEC.
   
 u32vector-set!

 -- Scheme Procedure: u32vector-set! uvec index value
     Set the element at INDEX in the uniform numeric
 vector UVEC to
     VALUE.  The return value is not
 specified.
   
 u32vector->list

 -- Scheme Procedure: u32vector->list uvec
     Convert the uniform numeric vector UVEC to a list.
   
 list->u32vector

 -- Scheme Procedure: list->u32vector l
     Convert the list L to a numeric uniform vector.
   
 any->u32vector

 -- Scheme Procedure: any->u32vector obj
     Convert OBJ, which can be a list, vector, or
 uniform vector, to
     a numeric uniform vector of
 type u32.
   
 s32vector?

 -- Scheme Procedure: s32vector? obj
     Return `#t' if OBJ is a vector of type s32,
 `#f' otherwise.
   
 make-s32vector

 -- Scheme Procedure: make-s32vector len [fill]
     Return a newly allocated uniform numeric vector which can
 hold
     LEN elements.  If FILL is given, it is used to
 initialize the
     elements, otherwise the contents of the vector
 is unspecified.
   
 s32vector

 -- Scheme Procedure: s32vector . l
     Return a newly allocated uniform numeric vector containing
 all
     argument values.
   
 s32vector-length

 -- Scheme Procedure: s32vector-length uvec
     Return the number of elements in the uniform numeric vector
     UVEC.
   
 s32vector-ref

 -- Scheme Procedure: s32vector-ref uvec index
     Return the element at INDEX in the uniform numeric
 vector UVEC.
   
 s32vector-set!

 -- Scheme Procedure: s32vector-set! uvec index value
     Set the element at INDEX in the uniform numeric
 vector UVEC to
     VALUE.  The return value is not
 specified.
   
 s32vector->list

 -- Scheme Procedure: s32vector->list uvec
     Convert the uniform numeric vector UVEC to a list.
   
 list->s32vector

 -- Scheme Procedure: list->s32vector l
     Convert the list L to a numeric uniform vector.
   
 any->s32vector

 -- Scheme Procedure: any->s32vector obj
     Convert OBJ, which can be a list, vector, or
 uniform vector, to
     a numeric uniform vector of
 type s32.
   
 u64vector?

 -- Scheme Procedure: u64vector? obj
     Return `#t' if OBJ is a vector of type u64,
 `#f' otherwise.
   
 make-u64vector

 -- Scheme Procedure: make-u64vector len [fill]
     Return a newly allocated uniform numeric vector which can
 hold
     LEN elements.  If FILL is given, it is used to
 initialize the
     elements, otherwise the contents of the vector
 is unspecified.
   
 u64vector

 -- Scheme Procedure: u64vector . l
     Return a newly allocated uniform numeric vector containing
 all
     argument values.
   
 u64vector-length

 -- Scheme Procedure: u64vector-length uvec
     Return the number of elements in the uniform numeric vector
     UVEC.
   
 u64vector-ref

 -- Scheme Procedure: u64vector-ref uvec index
     Return the element at INDEX in the uniform numeric
 vector UVEC.
   
 u64vector-set!

 -- Scheme Procedure: u64vector-set! uvec index value
     Set the element at INDEX in the uniform numeric
 vector UVEC to
     VALUE.  The return value is not
 specified.
   
 u64vector->list

 -- Scheme Procedure: u64vector->list uvec
     Convert the uniform numeric vector UVEC to a list.
   
 list->u64vector

 -- Scheme Procedure: list->u64vector l
     Convert the list L to a numeric uniform vector.
   
 any->u64vector

 -- Scheme Procedure: any->u64vector obj
     Convert OBJ, which can be a list, vector, or
 uniform vector, to
     a numeric uniform vector of
 type u64.
   
 s64vector?

 -- Scheme Procedure: s64vector? obj
     Return `#t' if OBJ is a vector of type s64,
 `#f' otherwise.
   
 make-s64vector

 -- Scheme Procedure: make-s64vector len [fill]
     Return a newly allocated uniform numeric vector which can
 hold
     LEN elements.  If FILL is given, it is used to
 initialize the
     elements, otherwise the contents of the vector
 is unspecified.
   
 s64vector

 -- Scheme Procedure: s64vector . l
     Return a newly allocated uniform numeric vector containing
 all
     argument values.
   
 s64vector-length

 -- Scheme Procedure: s64vector-length uvec
     Return the number of elements in the uniform numeric vector
     UVEC.
   
 s64vector-ref

 -- Scheme Procedure: s64vector-ref uvec index
     Return the element at INDEX in the uniform numeric
 vector UVEC.
   
 s64vector-set!

 -- Scheme Procedure: s64vector-set! uvec index value
     Set the element at INDEX in the uniform numeric
 vector UVEC to
     VALUE.  The return value is not
 specified.
   
 s64vector->list

 -- Scheme Procedure: s64vector->list uvec
     Convert the uniform numeric vector UVEC to a list.
   
 list->s64vector

 -- Scheme Procedure: list->s64vector l
     Convert the list L to a numeric uniform vector.
   
 any->s64vector

 -- Scheme Procedure: any->s64vector obj
     Convert OBJ, which can be a list, vector, or
 uniform vector, to
     a numeric uniform vector of
 type s64.
   
 f32vector?

 -- Scheme Procedure: f32vector? obj
     Return `#t' if OBJ is a vector of type f32,
 `#f' otherwise.
   
 make-f32vector

 -- Scheme Procedure: make-f32vector len [fill]
     Return a newly allocated uniform numeric vector which can
 hold
     LEN elements.  If FILL is given, it is used to
 initialize the
     elements, otherwise the contents of the vector
 is unspecified.
   
 f32vector

 -- Scheme Procedure: f32vector . l
     Return a newly allocated uniform numeric vector containing
 all
     argument values.
   
 f32vector-length

 -- Scheme Procedure: f32vector-length uvec
     Return the number of elements in the uniform numeric vector
     UVEC.
   
 f32vector-ref

 -- Scheme Procedure: f32vector-ref uvec index
     Return the element at INDEX in the uniform numeric
 vector UVEC.
   
 f32vector-set!

 -- Scheme Procedure: f32vector-set! uvec index value
     Set the element at INDEX in the uniform numeric
 vector UVEC to
     VALUE.  The return value is not
 specified.
   
 f32vector->list

 -- Scheme Procedure: f32vector->list uvec
     Convert the uniform numeric vector UVEC to a list.
   
 list->f32vector

 -- Scheme Procedure: list->f32vector l
     Convert the list L to a numeric uniform vector.
   
 any->f32vector

 -- Scheme Procedure: any->f32vector obj
     Convert OBJ, which can be a list, vector, or
 uniform vector, to
     a numeric uniform vector of
 type f32.
   
 f64vector?

 -- Scheme Procedure: f64vector? obj
     Return `#t' if OBJ is a vector of type f64,
 `#f' otherwise.
   
 make-f64vector

 -- Scheme Procedure: make-f64vector len [fill]
     Return a newly allocated uniform numeric vector which can
 hold
     LEN elements.  If FILL is given, it is used to
 initialize the
     elements, otherwise the contents of the vector
 is unspecified.
   
 f64vector

 -- Scheme Procedure: f64vector . l
     Return a newly allocated uniform numeric vector containing
 all
     argument values.
   
 f64vector-length

 -- Scheme Procedure: f64vector-length uvec
     Return the number of elements in the uniform numeric vector
     UVEC.
   
 f64vector-ref

 -- Scheme Procedure: f64vector-ref uvec index
     Return the element at INDEX in the uniform numeric
 vector UVEC.
   
 f64vector-set!

 -- Scheme Procedure: f64vector-set! uvec index value
     Set the element at INDEX in the uniform numeric
 vector UVEC to
     VALUE.  The return value is not
 specified.
   
 f64vector->list

 -- Scheme Procedure: f64vector->list uvec
     Convert the uniform numeric vector UVEC to a list.
   
 list->f64vector

 -- Scheme Procedure: list->f64vector l
     Convert the list L to a numeric uniform vector.
   
 any->f64vector

 -- Scheme Procedure: any->f64vector obj
     Convert OBJ, which can be a list, vector, or
 uniform vector, to
     a numeric uniform vector of
 type f64.
   
 c32vector?

 -- Scheme Procedure: c32vector? obj
     Return `#t' if OBJ is a vector of type c32,
 `#f' otherwise.
   
 make-c32vector

 -- Scheme Procedure: make-c32vector len [fill]
     Return a newly allocated uniform numeric vector which can
 hold
     LEN elements.  If FILL is given, it is used to
 initialize the
     elements, otherwise the contents of the vector
 is unspecified.
   
 c32vector

 -- Scheme Procedure: c32vector . l
     Return a newly allocated uniform numeric vector containing
 all
     argument values.
   
 c32vector-length

 -- Scheme Procedure: c32vector-length uvec
     Return the number of elements in the uniform numeric vector
     UVEC.
   
 c32vector-ref

 -- Scheme Procedure: c32vector-ref uvec index
     Return the element at INDEX in the uniform numeric
 vector UVEC.
   
 c32vector-set!

 -- Scheme Procedure: c32vector-set! uvec index value
     Set the element at INDEX in the uniform numeric
 vector UVEC to
     VALUE.  The return value is not
 specified.
   
 c32vector->list

 -- Scheme Procedure: c32vector->list uvec
     Convert the uniform numeric vector UVEC to a list.
   
 list->c32vector

 -- Scheme Procedure: list->c32vector l
     Convert the list L to a numeric uniform vector.
   
 any->c32vector

 -- Scheme Procedure: any->c32vector obj
     Convert OBJ, which can be a list, vector, or
 uniform vector, to
     a numeric uniform vector of
 type c32.
   
 c64vector?

 -- Scheme Procedure: c64vector? obj
     Return `#t' if OBJ is a vector of type c64,
 `#f' otherwise.
   
 make-c64vector

 -- Scheme Procedure: make-c64vector len [fill]
     Return a newly allocated uniform numeric vector which can
 hold
     LEN elements.  If FILL is given, it is used to
 initialize the
     elements, otherwise the contents of the vector
 is unspecified.
   
 c64vector

 -- Scheme Procedure: c64vector . l
     Return a newly allocated uniform numeric vector containing
 all
     argument values.
   
 c64vector-length

 -- Scheme Procedure: c64vector-length uvec
     Return the number of elements in the uniform numeric vector
     UVEC.
   
 c64vector-ref

 -- Scheme Procedure: c64vector-ref uvec index
     Return the element at INDEX in the uniform numeric
 vector UVEC.
   
 c64vector-set!

 -- Scheme Procedure: c64vector-set! uvec index value
     Set the element at INDEX in the uniform numeric
 vector UVEC to
     VALUE.  The return value is not
 specified.
   
 c64vector->list

 -- Scheme Procedure: c64vector->list uvec
     Convert the uniform numeric vector UVEC to a list.
   
 list->c64vector

 -- Scheme Procedure: list->c64vector l
     Convert the list L to a numeric uniform vector.
   
 any->c64vector

 -- Scheme Procedure: any->c64vector obj
     Convert OBJ, which can be a list, vector, or
 uniform vector, to
     a numeric uniform vector of
 type c64.
   
 string-null?

 -- Scheme Procedure: string-null? str
     Return `#t' if STR's length is zero, and
 `#f' otherwise.
          (string-null? "")  => #t
          y                    => "foo"
          (string-null? y)     => #f

 string-any-c-code

 -- Scheme Procedure: string-any-c-code char_pred s [start [end]]
     Check if CHAR_PRED is true for any character in string S.
 
     CHAR_PRED can be a character to check for any equal to that, or
     a character set (*note Character Sets::) to check for any in that
     set,
 or a predicate procedure to call.
 
 For a procedure,
     calls `(CHAR_PRED c)' are made
 successively on the characters
     from START to END.  If
 CHAR_PRED returns true (ie. non-`#f'),
     `string-any'
 stops and that return value is the return from
     `string-any'.  The
 call on the last character (ie. at END-1), if
     that
 point is reached, is a tail call.
 
 If there are no
     characters in S (ie. START equals
 END) then the return is `#f'.
     
   
 string-every-c-code

 -- Scheme Procedure: string-every-c-code char_pred s [start [end]]
     Check if CHAR_PRED is true for every character in string
 S.
 
     CHAR_PRED can be a character to check for every character equal
     to that, or a character set (*note Character Sets::) to check for
     every character being in that set, or a predicate procedure to
     call.
 
 For a procedure, calls `(CHAR_PRED c)' are made
     successively on the characters from START to END.  If
 CHAR_PRED
     returns `#f', `string-every' stops and
 returns `#f'.  The call
     on the last character (ie. at
 END-1), if that point is reached,
     is a tail call and the
 return from that call is the return from
     `string-every'.
 
 If there are no characters in S (ie. START
     equals
 END) then the return is `#t'.
 
   
 string-tabulate

 -- Scheme Procedure: string-tabulate proc len
     PROC is an integer->char procedure.  Construct a string
 of size
     LEN by applying PROC to each index to
 produce the corresponding
     string element.  The order in which
 PROC is applied to the
     indices is not specified.
   
 string->list

 -- Scheme Procedure: string->list str [start [end]]
     Convert the string STR into a list of characters.
   
 reverse-list->string

 -- Scheme Procedure: reverse-list->string chrs
     An efficient implementation of `(compose string->list
     reverse)':
 
          (reverse-list->string '(#\a #\B #\c)) => "cBa"

 string-join

 -- Scheme Procedure: string-join ls [delimiter [grammar]]
     Append the string in the string list LS, using the string
 DELIM
     as a delimiter between the elements of LS.
 GRAMMAR is a symbol
     which specifies how the delimiter is
 placed between the strings,
     and defaults to the symbol
 `infix'.
 
    `infix'
          Insert the separator between list elements.  An empty string
          will produce an empty list.

    `string-infix'
          Like `infix', but will raise an error if given the empty
          list.

    `suffix'
          Insert the separator after every list element.

    `prefix'
          Insert the separator before each list element.

 string-copy

 -- Scheme Procedure: string-copy str [start [end]]
     Return a freshly allocated copy of the string STR.  If
 given,
     START and END delimit the portion of
 STR which is copied.
   
 string-copy!

 -- Scheme Procedure: string-copy! target tstart s [start [end]]
     Copy the sequence of characters from index range [START,
 END) in
     string S to string TARGET, beginning
 at index TSTART.  The
     characters are copied left-to-right
 or right-to-left as needed -
     the copy is guaranteed to work,
 even if TARGET and S are the
     same string.  It is an
 error if the copy operation runs off the
     end of the target
 string.
   
 substring-move!

 -- Scheme Procedure: substring-move! str1 start1 end1 str2 start2
     Copy the substring of STR1 bounded by START1 and END1
 into STR2
     beginning at position START2.
 STR1 and STR2 can be the same
     string.
   
 string-take

 -- Scheme Procedure: string-take s n
     Return the N first characters of S.
   
 string-drop

 -- Scheme Procedure: string-drop s n
     Return all but the first N characters of S.
   
 string-take-right

 -- Scheme Procedure: string-take-right s n
     Return the N last characters of S.
   
 string-drop-right

 -- Scheme Procedure: string-drop-right s n
     Return all but the last N characters of S.
   
 string-pad

 -- Scheme Procedure: string-pad s len [chr [start [end]]]
     Take that characters from START to END from the
 string S and
     return a new string, right-padded by the
 character CHR to length
     LEN.  If the resulting
 string is longer than LEN, it is
     truncated on the right.
   
 string-pad-right

 -- Scheme Procedure: string-pad-right s len [chr [start [end]]]
     Take that characters from START to END from the
 string S and
     return a new string, left-padded by the
 character CHR to length
     LEN.  If the resulting
 string is longer than LEN, it is
     truncated on the left.
   
 string-trim

 -- Scheme Procedure: string-trim s [char_pred [start [end]]]
     Trim S by skipping over all characters on the left
 that satisfy
     the parameter CHAR_PRED:
 
        * if it is the character CH, characters equal to
 CH are
          trimmed,
 

        * if it is a procedure PRED characters that
 satisfy PRED are
          trimmed,
 

        * if it is a character set, characters in that set are
          trimmed.
     
 If called without a CHAR_PRED argument, all whitespace is
     trimmed.
   
 string-trim-right

 -- Scheme Procedure: string-trim-right s [char_pred [start [end]]]
     Trim S by skipping over all characters on the rightt
 that
     satisfy the parameter CHAR_PRED:
 
        * if it is the character CH, characters equal to CH
 are
          trimmed,
 

        * if it is a procedure PRED characters that satisfy
 PRED are
          trimmed,
 

        * if it is a character sets, all characters in that set are
          trimmed.
     
 If called without a CHAR_PRED argument, all whitespace is
     trimmed.
   
 string-trim-both

 -- Scheme Procedure: string-trim-both s [char_pred [start [end]]]
     Trim S by skipping over all characters on both sides of
 the
     string that satisfy the parameter CHAR_PRED:
 
        * if it is the character CH, characters equal to CH
 are
          trimmed,
 

        * if it is a procedure PRED characters that satisfy
 PRED are
          trimmed,
 

        * if it is a character set, the characters in the set are
          trimmed.
     
 If called without a CHAR_PRED argument, all whitespace is
     trimmed.
   
 string-fill!

 -- Scheme Procedure: string-fill! str chr [start [end]]
     Stores CHR in every element of the given STR and
 returns an
     unspecified value.
   
 string-compare

 -- Scheme Procedure: string-compare s1 s2 proc_lt proc_eq proc_gt
          [start1 [end1 [start2 [end2]]]]
     Apply PROC_LT, PROC_EQ, PROC_GT to the
 mismatch index, depending
     upon whether S1 is less than,
 equal to, or greater than S2.  The
     mismatch index is the
 largest index I such that for every 0 <= J
     <
 I, S1[J] = S2[J] - that is,
 I is the first position that
     does not match.
   
 string-compare-ci

 -- Scheme Procedure: string-compare-ci s1 s2 proc_lt proc_eq proc_gt
          [start1 [end1 [start2 [end2]]]]
     Apply PROC_LT, PROC_EQ, PROC_GT to the
 mismatch index, depending
     upon whether S1 is less than,
 equal to, or greater than S2.  The
     mismatch index is the
 largest index I such that for every 0 <= J
     <
 I, S1[J] = S2[J] - that is,
 I is the first position that
     does not match.  The
 character comparison is done
     case-insensitively.
   
 string=

 -- Scheme Procedure: string= s1 s2 [start1 [end1 [start2 [end2]]]]
     Return `#f' if S1 and S2 are not equal, a true
 value otherwise.
   
 string<>

 -- Scheme Procedure: string<> s1 s2 [start1 [end1 [start2 [end2]]]]
     Return `#f' if S1 and S2 are equal, a true
 value otherwise.
   
 string<

 -- Scheme Procedure: string< s1 s2 [start1 [end1 [start2 [end2]]]]
     Return `#f' if S1 is greater or equal to S2, a
 true value
     otherwise.
   
 string>

 -- Scheme Procedure: string> s1 s2 [start1 [end1 [start2 [end2]]]]
     Return `#f' if S1 is less or equal to S2, a
 true value
     otherwise.
   
 string<=

 -- Scheme Procedure: string<= s1 s2 [start1 [end1 [start2 [end2]]]]
     Return `#f' if S1 is greater to S2, a true
 value otherwise.
   
 string>=

 -- Scheme Procedure: string>= s1 s2 [start1 [end1 [start2 [end2]]]]
     Return `#f' if S1 is less to S2, a true value
 otherwise.
   
 string-ci=

 -- Scheme Procedure: string-ci= s1 s2 [start1 [end1 [start2 [end2]]]]
     Return `#f' if S1 and S2 are not equal, a true
 value otherwise.
     The character comparison is done
 case-insensitively.
   
 string-ci<>

 -- Scheme Procedure: string-ci<> s1 s2 [start1 [end1 [start2 [end2]]]]
     Return `#f' if S1 and S2 are equal, a true
 value otherwise.  The
     character comparison is done
 case-insensitively.
   
 string-ci<

 -- Scheme Procedure: string-ci< s1 s2 [start1 [end1 [start2 [end2]]]]
     Return `#f' if S1 is greater or equal to S2, a
 true value
     otherwise.  The character comparison is done
     case-insensitively.
   
 string-ci>

 -- Scheme Procedure: string-ci> s1 s2 [start1 [end1 [start2 [end2]]]]
     Return `#f' if S1 is less or equal to S2, a
 true value
     otherwise.  The character comparison is done
     case-insensitively.
   
 string-ci<=

 -- Scheme Procedure: string-ci<= s1 s2 [start1 [end1 [start2 [end2]]]]
     Return `#f' if S1 is greater to S2, a true
 value otherwise.  The
     character comparison is done
 case-insensitively.
   
 string-ci>=

 -- Scheme Procedure: string-ci>= s1 s2 [start1 [end1 [start2 [end2]]]]
     Return `#f' if S1 is less to S2, a true value
 otherwise.  The
     character comparison is done
 case-insensitively.
   
 string-hash

 -- Scheme Procedure: string-hash s [bound [start [end]]]
     Compute a hash value for S.  the optional argument BOUND is a
     non-negative exact integer specifying the range of the hash
     function. A positive value restricts the return value to the range
     [0,bound).
   
 string-hash-ci

 -- Scheme Procedure: string-hash-ci s [bound [start [end]]]
     Compute a hash value for S.  the optional argument BOUND is a
     non-negative exact integer specifying the range of the hash
     function. A positive value restricts the return value to the range
     [0,bound).
   
 string-prefix-length

 -- Scheme Procedure: string-prefix-length s1 s2 [start1 [end1 [start2
          [end2]]]]
     Return the length of the longest common prefix of the two
     strings.
   
 string-prefix-length-ci

 -- Scheme Procedure: string-prefix-length-ci s1 s2 [start1 [end1
          [start2 [end2]]]]
     Return the length of the longest common prefix of the two
     strings, ignoring character case.
   
 string-suffix-length

 -- Scheme Procedure: string-suffix-length s1 s2 [start1 [end1 [start2
          [end2]]]]
     Return the length of the longest common suffix of the two
     strings.
   
 string-suffix-length-ci

 -- Scheme Procedure: string-suffix-length-ci s1 s2 [start1 [end1
          [start2 [end2]]]]
     Return the length of the longest common suffix of the two
     strings, ignoring character case.
   
 string-prefix?

 -- Scheme Procedure: string-prefix? s1 s2 [start1 [end1 [start2
          [end2]]]]
     Is S1 a prefix of S2?
   
 string-prefix-ci?

 -- Scheme Procedure: string-prefix-ci? s1 s2 [start1 [end1 [start2
          [end2]]]]
     Is S1 a prefix of S2, ignoring character case?
   
 string-suffix?

 -- Scheme Procedure: string-suffix? s1 s2 [start1 [end1 [start2
          [end2]]]]
     Is S1 a suffix of S2?
   
 string-suffix-ci?

 -- Scheme Procedure: string-suffix-ci? s1 s2 [start1 [end1 [start2
          [end2]]]]
     Is S1 a suffix of S2, ignoring character case?
   
 string-index

 -- Scheme Procedure: string-index s char_pred [start [end]]
     Search through the string S from left to right, returning
 the
     index of the first occurence of a character which
 
        * equals CHAR_PRED, if it is character,
 

        * satisifies the predicate CHAR_PRED, if it is a procedure,
 

        * is in the set CHAR_PRED, if it is a character set.

 string-index-right

 -- Scheme Procedure: string-index-right s char_pred [start [end]]
     Search through the string S from right to left, returning
 the
     index of the last occurence of a character which
 
        * equals CHAR_PRED, if it is character,
 

        * satisifies the predicate CHAR_PRED, if it is a procedure,
 

        * is in the set if CHAR_PRED is a character set.

 string-rindex

 -- Scheme Procedure: string-rindex s char_pred [start [end]]
     Search through the string S from right to left, returning
 the
     index of the last occurence of a character which
 
        * equals CHAR_PRED, if it is character,
 

        * satisifies the predicate CHAR_PRED, if it is a procedure,
 

        * is in the set if CHAR_PRED is a character set.

 string-skip

 -- Scheme Procedure: string-skip s char_pred [start [end]]
     Search through the string S from left to right, returning
 the
     index of the first occurence of a character which
 
        * does not equal CHAR_PRED, if it is character,
 

        * does not satisify the predicate CHAR_PRED, if it is a
          procedure,
 

        * is not in the set if CHAR_PRED is a character set.

 string-skip-right

 -- Scheme Procedure: string-skip-right s char_pred [start [end]]
     Search through the string S from right to left, returning
 the
     index of the last occurence of a character which
 
        * does not equal CHAR_PRED, if it is character,
 

        * does not satisfy the predicate CHAR_PRED, if it is a
          procedure,
 

        * is not in the set if CHAR_PRED is a character set.

 string-count

 -- Scheme Procedure: string-count s char_pred [start [end]]
     Return the count of the number of characters in the string
 S
     which
 
        * equals CHAR_PRED, if it is character,
 

        * satisifies the predicate CHAR_PRED, if it is a procedure.
 

        * is in the set CHAR_PRED, if it is a character set.

 string-contains

 -- Scheme Procedure: string-contains s1 s2 [start1 [end1 [start2
          [end2]]]]
     Does string S1 contain string S2?  Return the index
 in S1 where
     S2 occurs as a substring, or false.
 The optional start/end
     indices restrict the operation to the
 indicated substrings.
   
 string-contains-ci

 -- Scheme Procedure: string-contains-ci s1 s2 [start1 [end1 [start2
          [end2]]]]
     Does string S1 contain string S2?  Return the index
 in S1 where
     S2 occurs as a substring, or false.
 The optional start/end
     indices restrict the operation to the
 indicated substrings.
     Character comparison is done
 case-insensitively.
   
 string-upcase!

 -- Scheme Procedure: string-upcase! str [start [end]]
     Destructively upcase every character in `str'.
 
          (string-upcase! y)
          => "ARRDEFG"
          y
          => "ARRDEFG"

 string-upcase

 -- Scheme Procedure: string-upcase str [start [end]]
     Upcase every character in `str'.
   
 string-downcase!

 -- Scheme Procedure: string-downcase! str [start [end]]
     Destructively downcase every character in STR.
 
          y
          => "ARRDEFG"
          (string-downcase! y)
          => "arrdefg"
          y
          => "arrdefg"

 string-downcase

 -- Scheme Procedure: string-downcase str [start [end]]
     Downcase every character in STR.
   
 string-titlecase!

 -- Scheme Procedure: string-titlecase! str [start [end]]
     Destructively titlecase every first character in a word in
 STR.
   
 string-titlecase

 -- Scheme Procedure: string-titlecase str [start [end]]
     Titlecase every first character in a word in STR.
   
 string-capitalize!

 -- Scheme Procedure: string-capitalize! str
     Upcase the first character of every word in STR
 destructively
     and return STR.
 
          y                      => "hello world"
          (string-capitalize! y) => "Hello World"
          y                      => "Hello World"

 string-capitalize

 -- Scheme Procedure: string-capitalize str
     Return a freshly allocated string with the characters in
 STR,
     where the first character of every word is
 capitalized.
   
 string-reverse

 -- Scheme Procedure: string-reverse str [start [end]]
     Reverse the string STR.  The optional arguments
 START and END
     delimit the region of STR to
 operate on.
   
 string-reverse!

 -- Scheme Procedure: string-reverse! str [start [end]]
     Reverse the string STR in-place.  The optional arguments
 START
     and END delimit the region of STR to
 operate on.  The return
     value is unspecified.
   
 string-append/shared

 -- Scheme Procedure: string-append/shared . rest
     Like `string-append', but the result may share memory
 with the
     argument strings.
   
 string-concatenate

 -- Scheme Procedure: string-concatenate ls
     Append the elements of LS (which must be strings)
 together into
     a single string.  Guaranteed to return a freshly
 allocated
     string.
   
 string-concatenate-reverse

 -- Scheme Procedure: string-concatenate-reverse ls [final_string [end]]
     Without optional arguments, this procedure is equivalent to
 
          (string-concatenate (reverse ls))
     
 If the optional argument FINAL_STRING is specified, it is
     consed onto the beginning to LS before performing the
     list-reverse and string-concatenate operations.  If END
 is
     given, only the characters of FINAL_STRING up to index
 END are
     used.
 
 Guaranteed to return a freshly allocated string.
   
 string-concatenate/shared

 -- Scheme Procedure: string-concatenate/shared ls
     Like `string-concatenate', but the result may share memory
 with
     the strings in the list LS.
   
 string-concatenate-reverse/shared

 -- Scheme Procedure: string-concatenate-reverse/shared ls
          [final_string [end]]
     Like `string-concatenate-reverse', but the result may
 share
     memory with the the strings in the LS arguments.
   
 string-map

 -- Scheme Procedure: string-map proc s [start [end]]
     PROC is a char->char procedure, it is mapped over
 S.  The order
     in which the procedure is applied to the
 string elements is not
     specified.
   
 string-map!

 -- Scheme Procedure: string-map! proc s [start [end]]
     PROC is a char->char procedure, it is mapped over
 S.  The order
     in which the procedure is applied to the
 string elements is not
     specified.  The string S is
 modified in-place, the return value
     is not specified.
   
 string-fold

 -- Scheme Procedure: string-fold kons knil s [start [end]]
     Fold KONS over the characters of S, with KNIL
 as the terminating
     element, from left to right.  KONS
 must expect two arguments:
     The actual character and the last
 result of KONS' application.
   
 string-fold-right

 -- Scheme Procedure: string-fold-right kons knil s [start [end]]
     Fold KONS over the characters of S, with KNIL
 as the terminating
     element, from right to left.  KONS
 must expect two arguments:
     The actual character and the last
 result of KONS' application.
   
 string-unfold

 -- Scheme Procedure: string-unfold p f g seed [base [make_final]]
        * G is used to generate a series of _seed_
 values from the
          initial SEED: SEED, (G
 SEED), (G^2 SEED), (G^3 SEED),
          ...

        * P tells us when to stop - when it returns true
 when applied
          to one of these seed values.

        * F maps each seed value to the corresponding
 character in
          the result string.  These chars are assembled
 into the
          string in a left-to-right order.

        * BASE is the optional initial/leftmost portion
 of the
          constructed string; it default to the empty
 string.

        * MAKE_FINAL is applied to the terminal seed
 value (on which
          P returns true) to produce
 the final/rightmost portion of
          the constructed string.
 It defaults to `(lambda (x) )'.

 string-unfold-right

 -- Scheme Procedure: string-unfold-right p f g seed [base [make_final]]
        * G is used to generate a series of _seed_
 values from the
          initial SEED: SEED, (G
 SEED), (G^2 SEED), (G^3 SEED),
          ...

        * P tells us when to stop - when it returns true
 when applied
          to one of these seed values.

        * F maps each seed value to the corresponding
 character in
          the result string.  These chars are assembled
 into the
          string in a right-to-left order.

        * BASE is the optional initial/rightmost portion
 of the
          constructed string; it default to the empty
 string.

        * MAKE_FINAL is applied to the terminal seed
 value (on which
          P returns true) to produce
 the final/leftmost portion of
          the constructed string.
 It defaults to `(lambda (x) )'.

 string-for-each

 -- Scheme Procedure: string-for-each proc s [start [end]]
     PROC is mapped over S in left-to-right order.  The
 return value
     is not specified.
   
 string-for-each-index

 -- Scheme Procedure: string-for-each-index proc s [start [end]]
     Call `(PROC i)' for each index i in S, from
 left to right.
 
     For example, to change characters to alternately upper and
 lower
     case,
 
          (define str (string-copy "studly"))
          (string-for-each-index
              (lambda (i)
                (string-set! str i
                  ((if (even? i) char-upcase char-downcase)
                   (string-ref str i))))
              str)
          str => "StUdLy"

 xsubstring

 -- Scheme Procedure: xsubstring s from [to [start [end]]]
     This is the _extended substring_ procedure that implements
     replicated copying of a substring of some string.
 
 S is a
     string, START and END are optional
 arguments that demarcate a
     substring of S, defaulting to
 0 and the length of S.  Replicate
     this substring up and
 down index space, in both the positive and
     negative directions.
 `xsubstring' returns the substring of this
     string
 beginning at index FROM, and ending at TO, which
     defaults to FROM + (END - START).
   
 string-xcopy!

 -- Scheme Procedure: string-xcopy! target tstart s sfrom [sto [start
          [end]]]
     Exactly the same as `xsubstring', but the extracted text
 is
     written into the string TARGET starting at index
 TSTART.  The
     operation is not defined if `(eq?
 TARGET S)' or these arguments
     share storage - you
 cannot copy a string on top of itself.
   
 string-replace

 -- Scheme Procedure: string-replace s1 s2 [start1 [end1 [start2
          [end2]]]]
     Return the string S1, but with the characters
 START1 ... END1
     replaced by the characters
 START2 ... END2 from S2.
   
 string-tokenize

 -- Scheme Procedure: string-tokenize s [token_set [start [end]]]
     Split the string S into a list of substrings, where each
     substring is a maximal non-empty contiguous sequence of
     characters from the character set TOKEN_SET, which
 defaults to
     `char-set:graphic'.
 If START or END indices are provided, they
     restrict
 `string-tokenize' to operating on the indicated
     substring
 of S.
   
 string-split

 -- Scheme Procedure: string-split str chr
     Split the string STR into the a list of the substrings delimited
     by appearances of the character CHR.  Note that an empty
     substring
 between separator characters will result in an empty
     string in the
 result list.
 
          (string-split "root:x:0:0:root:/root:/bin/bash" #\:)
          =>
          ("root" "x" "0" "0" "root" "/root" "/bin/bash")
          
          (string-split "::" #\:)
          =>
          ("" "" "")
          
          (string-split "" #\:)
          =>
          ("")

 string-filter

 -- Scheme Procedure: string-filter s char_pred [start [end]]
     Filter the string S, retaining only those characters
 which
     satisfy CHAR_PRED.
 
 If CHAR_PRED is a procedure, it is applied
     to each
 character as a predicate, if it is a character, it is
     tested
 for equality and if it is a character set, it is tested
     for
 membership.
   
 string-delete

 -- Scheme Procedure: string-delete s char_pred [start [end]]
     Delete characters satisfying CHAR_PRED from S.
 
 If CHAR_PRED
     is a procedure, it is applied to each
 character as a predicate,
     if it is a character, it is tested
 for equality and if it is a
     character set, it is tested for
 membership.
   
 char-set?

 -- Scheme Procedure: char-set? obj
     Return `#t' if OBJ is a character set, `#f'
 otherwise.
   
 char-set=

 -- Scheme Procedure: char-set= . char_sets
     Return `#t' if all given character sets are equal.
   
 char-set<=

 -- Scheme Procedure: char-set<= . char_sets
     Return `#t' if every character set CSi is a subset
 of character
     set CSi+1.
   
 char-set-hash

 -- Scheme Procedure: char-set-hash cs [bound]
     Compute a hash value for the character set CS.  If
 BOUND is
     given and non-zero, it restricts the
 returned value to the range
     0 ... BOUND - 1.
   
 char-set-cursor

 -- Scheme Procedure: char-set-cursor cs
     Return a cursor into the character set CS.
   
 char-set-ref

 -- Scheme Procedure: char-set-ref cs cursor
     Return the character at the current cursor position
 CURSOR in
     the character set CS.  It is an error to
 pass a cursor for which
     `end-of-char-set?' returns true.
   
 char-set-cursor-next

 -- Scheme Procedure: char-set-cursor-next cs cursor
     Advance the character set cursor CURSOR to the next
 character in
     the character set CS.  It is an error if the
 cursor given
     satisfies `end-of-char-set?'.
   
 end-of-char-set?

 -- Scheme Procedure: end-of-char-set? cursor
     Return `#t' if CURSOR has reached the end of a
 character set,
     `#f' otherwise.
   
 char-set-fold

 -- Scheme Procedure: char-set-fold kons knil cs
     Fold the procedure KONS over the character set CS,
 initializing
     it with KNIL.
   
 char-set-unfold

 -- Scheme Procedure: char-set-unfold p f g seed [base_cs]
     This is a fundamental constructor for character sets.
        * G is used to generate a series of "seed" values
 from the
          initial seed: SEED, (G SEED),
 (G^2 SEED), (G^3 SEED), ...

        * P tells us when to stop - when it returns true
 when applied
          to one of the seed values.

        * F maps each seed value to a character. These
 characters are
          added to the base character set BASE_CS to
 form the result;
          BASE_CS defaults to the empty set.

 char-set-unfold!

 -- Scheme Procedure: char-set-unfold! p f g seed base_cs
     This is a fundamental constructor for character sets.
        * G is used to generate a series of "seed" values
 from the
          initial seed: SEED, (G SEED),
 (G^2 SEED), (G^3 SEED), ...

        * P tells us when to stop - when it returns true
 when applied
          to one of the seed values.

        * F maps each seed value to a character. These
 characters are
          added to the base character set BASE_CS to
 form the result;
          BASE_CS defaults to the empty set.

 char-set-for-each

 -- Scheme Procedure: char-set-for-each proc cs
     Apply PROC to every character in the character set
 CS.  The
     return value is not specified.
   
 char-set-map

 -- Scheme Procedure: char-set-map proc cs
     Map the procedure PROC over every character in CS.
 PROC must be
     a character -> character procedure.
   
 char-set-copy

 -- Scheme Procedure: char-set-copy cs
     Return a newly allocated character set containing all
 characters
     in CS.
   
 char-set

 -- Scheme Procedure: char-set . rest
     Return a character set containing all given characters.
   
 list->char-set

 -- Scheme Procedure: list->char-set list [base_cs]
     Convert the character list LIST to a character set.  If
 the
     character set BASE_CS is given, the character in this
 set are
     also included in the result.
   
 list->char-set!

 -- Scheme Procedure: list->char-set! list base_cs
     Convert the character list LIST to a character set.  The
     characters are added to BASE_CS and BASE_CS is
 returned.
   
 string->char-set

 -- Scheme Procedure: string->char-set str [base_cs]
     Convert the string STR to a character set.  If the
 character set
     BASE_CS is given, the characters in this
 set are also included
     in the result.
   
 string->char-set!

 -- Scheme Procedure: string->char-set! str base_cs
     Convert the string STR to a character set.  The
 characters from
     the string are added to BASE_CS, and
 BASE_CS is returned.
   
 char-set-filter

 -- Scheme Procedure: char-set-filter pred cs [base_cs]
     Return a character set containing every character from CS
 so
     that it satisfies PRED.  If provided, the characters
 from
     BASE_CS are added to the result.
   
 char-set-filter!

 -- Scheme Procedure: char-set-filter! pred cs base_cs
     Return a character set containing every character from CS
 so
     that it satisfies PRED.  The characters are added to
 BASE_CS and
     BASE_CS is returned.
   
 ucs-range->char-set

 -- Scheme Procedure: ucs-range->char-set lower upper [error [base_cs]]
     Return a character set containing all characters whose
 character
     codes lie in the half-open range
 [LOWER,UPPER).
 
 If ERROR is
     a true value, an error is signalled if the
 specified range
     contains characters which are not contained in
 the implemented
     character range.  If ERROR is `#f',
 these characters are
     silently left out of the resultung
 character set.
 
 The
     characters in BASE_CS are added to the result, if
 given.
   
 ucs-range->char-set!

 -- Scheme Procedure: ucs-range->char-set! lower upper error base_cs
     Return a character set containing all characters whose
 character
     codes lie in the half-open range
 [LOWER,UPPER).
 
 If ERROR is
     a true value, an error is signalled if the
 specified range
     contains characters which are not contained in
 the implemented
     character range.  If ERROR is `#f',
 these characters are
     silently left out of the resultung
 character set.
 
 The
     characters are added to BASE_CS and BASE_CS is
 returned.
   
 ->char-set

 -- Scheme Procedure: ->char-set x
     Coerces x into a char-set. X may be a string, character or
     char-set. A string is converted to the set of its constituent
     characters; a character is converted to a singleton set; a
     char-set is returned as-is.
   
 char-set-size

 -- Scheme Procedure: char-set-size cs
     Return the number of elements in character set CS.
   
 char-set-count

 -- Scheme Procedure: char-set-count pred cs
     Return the number of the elements int the character set
 CS which
     satisfy the predicate PRED.
   
 char-set->list

 -- Scheme Procedure: char-set->list cs
     Return a list containing the elements of the character set
 CS.
   
 char-set->string

 -- Scheme Procedure: char-set->string cs
     Return a string containing the elements of the character set
 CS.
     The order in which the characters are placed in the
 string is
     not defined.
   
 char-set-contains?

 -- Scheme Procedure: char-set-contains? cs ch
     Return `#t' iff the character CH is contained in the
 character
     set CS.
   
 char-set-every

 -- Scheme Procedure: char-set-every pred cs
     Return a true value if every character in the character set
 CS
     satisfies the predicate PRED.
   
 char-set-any

 -- Scheme Procedure: char-set-any pred cs
     Return a true value if any character in the character set
 CS
     satisfies the predicate PRED.
   
 char-set-adjoin

 -- Scheme Procedure: char-set-adjoin cs . rest
     Add all character arguments to the first argument, which must
 be
     a character set.
   
 char-set-delete

 -- Scheme Procedure: char-set-delete cs . rest
     Delete all character arguments from the first argument, which
     must be a character set.
   
 char-set-adjoin!

 -- Scheme Procedure: char-set-adjoin! cs . rest
     Add all character arguments to the first argument, which must
 be
     a character set.
   
 char-set-delete!

 -- Scheme Procedure: char-set-delete! cs . rest
     Delete all character arguments from the first argument, which
     must be a character set.
   
 char-set-complement

 -- Scheme Procedure: char-set-complement cs
     Return the complement of the character set CS.
   
 char-set-union

 -- Scheme Procedure: char-set-union . rest
     Return the union of all argument character sets.
   
 char-set-intersection

 -- Scheme Procedure: char-set-intersection . rest
     Return the intersection of all argument character sets.
   
 char-set-difference

 -- Scheme Procedure: char-set-difference cs1 . rest
     Return the difference of all argument character sets.
   
 char-set-xor

 -- Scheme Procedure: char-set-xor . rest
     Return the exclusive-or of all argument character sets.
   
 char-set-diff+intersection

 -- Scheme Procedure: char-set-diff+intersection cs1 . rest
     Return the difference and the intersection of all argument
     character sets.
   
 char-set-complement!

 -- Scheme Procedure: char-set-complement! cs
     Return the complement of the character set CS.
   
 char-set-union!

 -- Scheme Procedure: char-set-union! cs1 . rest
     Return the union of all argument character sets.
   
 char-set-intersection!

 -- Scheme Procedure: char-set-intersection! cs1 . rest
     Return the intersection of all argument character sets.
   
 char-set-difference!

 -- Scheme Procedure: char-set-difference! cs1 . rest
     Return the difference of all argument character sets.
   
 char-set-xor!

 -- Scheme Procedure: char-set-xor! cs1 . rest
     Return the exclusive-or of all argument character sets.
   
 char-set-diff+intersection!

 -- Scheme Procedure: char-set-diff+intersection! cs1 cs2 . rest
     Return the difference and the intersection of all argument
     character sets.
   
 string=?

 -- Scheme Procedure: string=? s1 s2
     Lexicographic equality predicate; return `#t' if the two
 strings
     are the same length and contain the same characters in
 the same
     positions, otherwise return `#f'.
 
 The procedure `string-ci=?'
     treats upper and lower case
 letters as though they were the same
     character, but
 `string=?' treats upper and lower case as
     distinct
 characters.
   
 string-ci=?

 -- Scheme Procedure: string-ci=? s1 s2
     Case-insensitive string equality predicate; return `#t' if
 the
     two strings are the same length and their component
 characters
     match (ignoring case) at each position; otherwise
 return `#f'.
   
 string<?

 -- Scheme Procedure: string<? s1 s2
     Lexicographic ordering predicate; return `#t' if S1
 is
     lexicographically less than S2.
   
 string<=?

 -- Scheme Procedure: string<=? s1 s2
     Lexicographic ordering predicate; return `#t' if S1
 is
     lexicographically less than or equal to S2.
   
 string>?

 -- Scheme Procedure: string>? s1 s2
     Lexicographic ordering predicate; return `#t' if S1
 is
     lexicographically greater than S2.
   
 string>=?

 -- Scheme Procedure: string>=? s1 s2
     Lexicographic ordering predicate; return `#t' if S1
 is
     lexicographically greater than or equal to S2.
   
 string-ci<?

 -- Scheme Procedure: string-ci<? s1 s2
     Case insensitive lexicographic ordering predicate; return
 `#t'
     if S1 is lexicographically less than S2
 regardless of case.
   
 string-ci<=?

 -- Scheme Procedure: string-ci<=? s1 s2
     Case insensitive lexicographic ordering predicate; return
 `#t'
     if S1 is lexicographically less than or equal
 to S2 regardless
     of case.
   
 string-ci>?

 -- Scheme Procedure: string-ci>? s1 s2
     Case insensitive lexicographic ordering predicate; return
 `#t'
     if S1 is lexicographically greater than
 S2 regardless of case.
   
 string-ci>=?

 -- Scheme Procedure: string-ci>=? s1 s2
     Case insensitive lexicographic ordering predicate; return
 `#t'
     if S1 is lexicographically greater than or
 equal to S2
     regardless of case.
   
 object->string

 -- Scheme Procedure: object->string obj [printer]
     Return a Scheme string obtained by printing OBJ.
 Printing
     function can be specified by the optional second
 argument
     PRINTER (default: `write').
   
 call-with-output-string

 -- Scheme Procedure: call-with-output-string proc
     Calls the one-argument procedure PROC with a newly created output
     port.  When the function returns, the string composed of the
     characters
 written into the port is returned.
   
 call-with-input-string

 -- Scheme Procedure: call-with-input-string string proc
     Calls the one-argument procedure PROC with a newly
 created input
     port from which STRING's contents may be
 read.  The value
     yielded by the PROC is returned.
   
 open-input-string

 -- Scheme Procedure: open-input-string str
     Take a string and return an input port that delivers characters
     from the string. The port can be closed by
 `close-input-port',
     though its storage will be reclaimed
 by the garbage collector if
     it becomes inaccessible.
   
 open-output-string

 -- Scheme Procedure: open-output-string
     Return an output port that will accumulate characters for
     retrieval by `get-output-string'. The port can be closed
 by the
     procedure `close-output-port', though its storage
 will be
     reclaimed by the garbage collector if it becomes
 inaccessible.
   
 get-output-string

 -- Scheme Procedure: get-output-string port
     Given an output port created by `open-output-string',
 return a
     string consisting of the characters that have been
 output to the
     port so far.
   
 eval-string

 -- Scheme Procedure: eval-string string [module]
     Evaluate STRING as the text representation of a Scheme
 form or
     forms, and return whatever value they produce.
 Evaluation takes
     place in the given module, or the current
 module when no module
     is given.
 While the code is evaluated, the given module is made
     the
 current one.  The current module is restored when this
     procedure returns.
   
 make-struct-layout

 -- Scheme Procedure: make-struct-layout fields
     Return a new structure layout object.
 
 FIELDS must be a string
     made up of pairs of characters
 strung together.  The first
     character of each pair describes a field
 type, the second a
     field protection.  Allowed types are 'p' for
 GC-protected Scheme
     data, 'u' for unprotected binary data, and 's' for
 a field that
     points to the structure itself.    Allowed protections
 are 'w'
     for mutable fields, 'r' for read-only fields, and 'o' for opaque
     fields.  The last field protection specification may be
     capitalized to
 indicate that the field is a tail-array.
   
 struct?

 -- Scheme Procedure: struct? x
     Return `#t' iff X is a structure object, else
 `#f'.
   
 struct-vtable?

 -- Scheme Procedure: struct-vtable? x
     Return `#t' iff X is a vtable structure.
   
 make-struct

 -- Scheme Procedure: make-struct vtable tail_array_size . init
     Create a new structure.
 
 TYPE must be a vtable structure
     (*note Vtables::).
 
 TAIL-ELTS must be a non-negative integer.
     If the layout
 specification indicated by TYPE includes a
     tail-array,
 this is the number of elements allocated to that
     array.
 
 The INIT1, ... are optional arguments describing how
     successive fields of the structure should be initialized.  Only
     fields
 with protection 'r' or 'w' can be initialized, except for
     fields of
 type 's', which are automatically initialized to point
     to the new
 structure itself; fields with protection 'o' can not
     be initialized by
 Scheme programs.
 
 If fewer optional
     arguments than initializable fields are supplied,
 fields of type
     'p' get default value #f while fields of type 'u' are
     initialized to 0.
 
 Structs are currently the basic
     representation for record-like data
 structures in Guile.  The
     plan is to eventually replace them with a
 new representation
     which will at the same time be easier to use and
 more powerful.
     
 For more information, see the documentation for
     `make-vtable-vtable'.
   
 make-vtable-vtable

 -- Scheme Procedure: make-vtable-vtable user_fields tail_array_size .
          init
     Return a new, self-describing vtable structure.
 
 USER-FIELDS
     is a string describing user defined fields of the
 vtable
     beginning at index `vtable-offset-user'
 (see
     `make-struct-layout').
 
 TAIL-SIZE specifies the size of the
     tail-array (if any) of
 this vtable.
 
 INIT1, ... are the
     optional initializers for the fields of
 the vtable.
 
 Vtables
     have one initializable system field--the struct printer.
 This
     field comes before the user fields in the initializers passed
 to
     `make-vtable-vtable' and `make-struct', and thus works as
 a
     third optional argument to `make-vtable-vtable' and a fourth to
     `make-struct' when creating vtables:
 
 If the value is a
     procedure, it will be called instead of the standard
 printer
     whenever a struct described by this vtable is printed.
 The
     procedure will be called with arguments STRUCT and PORT.
 
 The
     structure of a struct is described by a vtable, so the vtable is
     in essence the type of the struct.  The vtable is itself a struct
     with
 a vtable.  This could go on forever if it weren't for the
     vtable-vtables which are self-describing vtables, and thus
     terminate
 the chain.
 
 There are several potential ways of
     using structs, but the standard
 one is to use three kinds of
     structs, together building up a type
 sub-system: one
     vtable-vtable working as the root and one or several
 "types",
     each with a set of "instances".  (The vtable-vtable should be
     compared to the class <class> which is the class of itself.)
 
          (define ball-root (make-vtable-vtable "pr" 0))
          
          (define (make-ball-type ball-color)
            (make-struct ball-root 0
          	       (make-struct-layout "pw")
                         (lambda (ball port)
                           (format port "#<a ~A ball owned by ~A>"
                                   (color ball)
                                   (owner ball)))
                         ball-color))
          (define (color ball) (struct-ref (struct-vtable ball) vtable-offset-user))
          (define (owner ball) (struct-ref ball 0))
          
          (define red (make-ball-type 'red))
          (define green (make-ball-type 'green))
          
          (define (make-ball type owner) (make-struct type 0 owner))
          
          (define ball (make-ball green 'Nisse))
          ball => #<a green ball owned by Nisse>

 make-vtable

 -- Scheme Procedure: make-vtable fields [printer]
     Create a vtable, for creating structures with the given
 FIELDS.
     
 The optional PRINTER argument is a function to be called
     `(PRINTER struct port)' on the structures created.
 It should
     look at STRUCT and write to PORT.
   
 struct-ref

 -- Scheme Procedure: struct-ref handle pos
 -- Scheme Procedure: struct-set! struct n value
     Access (or modify) the Nth field of STRUCT.
 
 If the field is
     of type 'p', then it can be set to an arbitrary value.
 
 If the
     field is of type 'u', then it can only be set to a non-negative
     integer value small enough to fit in one machine word.
   
 struct-set!

 -- Scheme Procedure: struct-set! handle pos val
     Set the slot of the structure HANDLE with index POS
 to VAL.
     Signal an error if the slot can not be written
 to.
   
 struct-vtable

 -- Scheme Procedure: struct-vtable handle
     Return the vtable structure that describes the type of STRUCT.
   
 struct-vtable-tag

 -- Scheme Procedure: struct-vtable-tag handle
     Return the vtable tag of the structure HANDLE.
   
 struct-vtable-name

 -- Scheme Procedure: struct-vtable-name vtable
     Return the name of the vtable VTABLE.
   
 set-struct-vtable-name!

 -- Scheme Procedure: set-struct-vtable-name! vtable name
     Set the name of the vtable VTABLE to NAME.
   
 symbol?

 -- Scheme Procedure: symbol? obj
     Return `#t' if OBJ is a symbol, otherwise return
 `#f'.
   
 symbol-interned?

 -- Scheme Procedure: symbol-interned? symbol
     Return `#t' if SYMBOL is interned, otherwise return
 `#f'.
   
 make-symbol

 -- Scheme Procedure: make-symbol name
     Return a new uninterned symbol with the name NAME.  The returned
     symbol is guaranteed to be unique and future calls to
     `string->symbol' will not return it.
   
 symbol->string

 -- Scheme Procedure: symbol->string s
     Return the name of SYMBOL as a string.  If the symbol was
 part
     of an object returned as the value of a literal expression
     (section *note Literal expressions: (r5rs)Literal expressions.) or
     by a call to the `read' procedure,
 and its name contains
     alphabetic characters, then the string
 returned will contain
     characters in the implementation's
 preferred standard case--some
     implementations will prefer
 upper case, others lower case.  If
     the symbol was returned by
 `string->symbol', the case of
     characters in the string
 returned will be the same as the case
     in the string that was
 passed to `string->symbol'.  It is an
     error to apply
 mutation procedures like `string-set!' to strings
     returned
 by this procedure.
 
 The following examples assume
     that the implementation's
 standard case is lower case:
 
          (symbol->string 'flying-fish)    => "flying-fish"
          (symbol->string 'Martin)         =>  "martin"
          (symbol->string
             (string->symbol "Malvina")) => "Malvina"

 string->symbol

 -- Scheme Procedure: string->symbol string
     Return the symbol whose name is STRING. This procedure
 can
     create symbols with names containing special characters or
     letters in the non-standard case, but it is usually a bad idea
     to create such symbols because in some implementations of
 Scheme
     they cannot be read as themselves.  See
 `symbol->string'.
 
     The following examples assume that the implementation's
 standard
     case is lower case:
 
          (eq? 'mISSISSIppi 'mississippi) => #t
          (string->symbol "mISSISSIppi") => the symbol with name "mISSISSIppi"
          (eq? 'bitBlt (string->symbol "bitBlt")) => #f
          (eq? 'JollyWog
            (string->symbol (symbol->string 'JollyWog))) => #t
          (string=? "K. Harper, M.D."
            (symbol->string
              (string->symbol "K. Harper, M.D."))) =>#t

 string-ci->symbol

 -- Scheme Procedure: string-ci->symbol str
     Return the symbol whose name is STR.  STR is
 converted to
     lowercase before the conversion is done, if Guile
 is currently
     reading symbols case-insensitively.
   
 gensym

 -- Scheme Procedure: gensym [prefix]
     Create a new symbol with a name constructed from a prefix and
 a
     counter value. The string PREFIX can be specified as
 an optional
     argument. Default prefix is ` g'.  The counter
 is increased by 1
     at each call. There is no provision for
 resetting the counter.
   
 symbol-hash

 -- Scheme Procedure: symbol-hash symbol
     Return a hash value for SYMBOL.
   
 symbol-fref

 -- Scheme Procedure: symbol-fref s
     Return the contents of SYMBOL's "function slot".
   
 symbol-pref

 -- Scheme Procedure: symbol-pref s
     Return the "property list" currently associated with SYMBOL.
   
 symbol-fset!

 -- Scheme Procedure: symbol-fset! s val
     Change the binding of SYMBOL's function slot.
   
 symbol-pset!

 -- Scheme Procedure: symbol-pset! s val
     Change the binding of SYMBOL's property slot.
   
 call-with-new-thread

 -- Scheme Procedure: call-with-new-thread thunk [handler]
     Call `thunk' in a new thread and with a new dynamic state,
     returning a new thread object representing the thread.  The
     procedure
 THUNK is called via `with-continuation-barrier'.
 
     When HANDLER is specified, then THUNK is called from
 within a
     `catch' with tag `#t' that has HANDLER as its
 handler.  This
     catch is established inside the continuation barrier.
 
 Once
     THUNK or HANDLER returns, the return value is made
 the _exit
     value_ of the thread and the thread is terminated.
   
 yield

 -- Scheme Procedure: yield
     Move the calling thread to the end of the scheduling queue.
   
 join-thread

 -- Scheme Procedure: join-thread thread
     Suspend execution of the calling thread until the target THREAD
     terminates, unless the target THREAD has already terminated. 
   
 make-mutex

 -- Scheme Procedure: make-mutex
     Create a new mutex. 
   
 make-recursive-mutex

 -- Scheme Procedure: make-recursive-mutex
     Create a new recursive mutex. 
   
 lock-mutex

 -- Scheme Procedure: lock-mutex mx
     Lock MUTEX. If the mutex is already locked, the calling thread
     blocks until the mutex becomes available. The function returns
     when the calling thread owns the lock on MUTEX.  Locking a mutex
     that a thread already owns will succeed right away and will not
     block the thread.  That is, Guile's mutexes are _recursive_. 
   
 try-mutex

 -- Scheme Procedure: try-mutex mutex
     Try to lock MUTEX. If the mutex is already locked by someone else,
     return `#f'.  Else lock the mutex and return `#t'. 
   
 unlock-mutex

 -- Scheme Procedure: unlock-mutex mx
     Unlocks MUTEX if the calling thread owns the lock on MUTEX.
     Calling unlock-mutex on a mutex not owned by the current thread
     results in undefined behaviour. Once a mutex has been unlocked,
     one thread blocked on MUTEX is awakened and grabs the mutex lock.
     Every call to `lock-mutex' by this thread must be matched with a
     call to `unlock-mutex'.  Only the last call to `unlock-mutex' will
     actually unlock the mutex. 
   
 make-condition-variable

 -- Scheme Procedure: make-condition-variable
     Make a new condition variable.
   
 wait-condition-variable

 -- Scheme Procedure: wait-condition-variable cv mx [t]
     Wait until COND-VAR has been signalled.  While waiting, MUTEX is
     atomically unlocked (as with `unlock-mutex') and is locked again
     when this function returns.  When TIME is given, it specifies a
     point in time where the waiting should be aborted.  It can be
     either a integer as returned by `current-time' or a pair as
     returned by `gettimeofday'.  When the waiting is aborted the mutex
     is locked and `#f' is returned.  When the condition variable is in
     fact signalled, the mutex is also locked and `#t' is returned. 
   
 signal-condition-variable

 -- Scheme Procedure: signal-condition-variable cv
     Wake up one thread that is waiting for CV
   
 broadcast-condition-variable

 -- Scheme Procedure: broadcast-condition-variable cv
     Wake up all threads that are waiting for CV. 
   
 current-thread

 -- Scheme Procedure: current-thread
     Return the thread that called this function.
   
 all-threads

 -- Scheme Procedure: all-threads
     Return a list of all threads.
   
 thread-exited?

 -- Scheme Procedure: thread-exited? thread
     Return `#t' iff THREAD has exited.
 
   
 catch

 -- Scheme Procedure: catch key thunk handler [pre_unwind_handler]
     Invoke THUNK in the dynamic context of HANDLER for
 exceptions
     matching KEY.  If thunk throws to the symbol
 KEY, then HANDLER
     is invoked this way:
          (handler key args ...)
     
 KEY is a symbol or `#t'.
 
 THUNK takes no arguments.  If
     THUNK returns
 normally, that is the return value of `catch'.
 
     Handler is invoked outside the scope of its own `catch'.
 If
     HANDLER again throws to the same key, a new handler
 from further
     up the call chain is invoked.
 
 If the key is `#t', then a
     throw to _any_ symbol will
 match this call to `catch'.
 
 If a
     PRE-UNWIND-HANDLER is given and THUNK throws
 an exception that
     matches KEY, Guile calls the
 PRE-UNWIND-HANDLER before unwinding
     the dynamic state and
 invoking the main HANDLER.
     PRE-UNWIND-HANDLER should
 be a procedure with the same signature
     as HANDLER, that
 is `(lambda (key . args))'.  It is typically
     used to save
 the stack at the point where the exception
     occurred, but can also
 query other parts of the dynamic state at
     that point, such as
 fluid values.
 
 A PRE-UNWIND-HANDLER can
     exit either normally or non-locally.
 If it exits normally, Guile
     unwinds the stack and dynamic context
 and then calls the normal
     (third argument) handler.  If it exits
 non-locally, that exit
     determines the continuation.
   
 with-throw-handler

 -- Scheme Procedure: with-throw-handler key thunk handler
     Add HANDLER to the dynamic context as a throw handler
 for key
     KEY, then invoke THUNK.
   
 lazy-catch

 -- Scheme Procedure: lazy-catch key thunk handler
     This behaves exactly like `catch', except that it does
 not
     unwind the stack before invoking HANDLER.
 If the HANDLER
     procedure returns normally, Guile
 rethrows the same exception
     again to the next innermost catch,
 lazy-catch or throw handler.
     If the HANDLER exits
 non-locally, that exit determines the
     continuation.
   
 throw

 -- Scheme Procedure: throw key . args
     Invoke the catch form matching KEY, passing ARGS to the
 HANDLER.
     
 
 KEY is a symbol.  It will match catches of the same symbol
     or of
 `#t'.
 
 If there is no handler at all, Guile prints an
     error and then exits.
   
 values

 -- Scheme Procedure: values . args
     Delivers all of its arguments to its continuation.  Except for
     continuations created by the `call-with-values' procedure,
 all
     continuations take exactly one value.  The effect of
 passing no
     value or more than one value to continuations that
 were not
     created by `call-with-values' is unspecified.
   
 make-variable

 -- Scheme Procedure: make-variable init
     Return a variable initialized to value INIT.
   
 make-undefined-variable

 -- Scheme Procedure: make-undefined-variable
     Return a variable that is initially unbound.
   
 variable?

 -- Scheme Procedure: variable? obj
     Return `#t' iff OBJ is a variable object, else
 return `#f'.
   
 variable-ref

 -- Scheme Procedure: variable-ref var
     Dereference VAR and return its value.
 VAR must be a variable
     object; see `make-variable'
 and `make-undefined-variable'.
   
 variable-set!

 -- Scheme Procedure: variable-set! var val
     Set the value of the variable VAR to VAL.
 VAR must be a variable
     object, VAL can be any
 value. Return an unspecified value.
   
 variable-bound?

 -- Scheme Procedure: variable-bound? var
     Return `#t' iff VAR is bound to a value.
 Throws an error if VAR
     is not a variable object.
   
 vector?

 -- Scheme Procedure: vector? obj
     Return `#t' if OBJ is a vector, otherwise return
 `#f'.
   
 list->vector

 -- Scheme Procedure: list->vector
     implemented by the C function "scm_vector"
   
 vector

 -- Scheme Procedure: vector . l
 -- Scheme Procedure: list->vector l
     Return a newly allocated vector composed of the
 given arguments.
     Analogous to `list'.
 
          (vector 'a 'b 'c) => #(a b c)

 make-vector

 -- Scheme Procedure: make-vector k [fill]
     Return a newly allocated vector of K elements.  If a
 second
     argument is given, then each position is initialized to
 FILL.
     Otherwise the initial contents of each position is
 unspecified.
   
 vector-copy

 -- Scheme Procedure: vector-copy vec
     Return a copy of VEC.
   
 vector->list

 -- Scheme Procedure: vector->list v
     Return a newly allocated list composed of the elements of V.
 
          (vector->list '#(dah dah didah)) =>  (dah dah didah)
          (list->vector '(dididit dah)) =>  #(dididit dah)

 vector-fill!

 -- Scheme Procedure: vector-fill! v fill
     Store FILL in every position of VECTOR.  The value
 returned by
     `vector-fill!' is unspecified.
   
 vector-move-left!

 -- Scheme Procedure: vector-move-left! vec1 start1 end1 vec2 start2
     Copy elements from VEC1, positions START1 to END1,
 to VEC2
     starting at position START2.  START1 and
 START2 are inclusive
     indices; END1 is exclusive.
 
 `vector-move-left!' copies
     elements in leftmost order.
 Therefore, in the case where VEC1
     and VEC2 refer to the
 same vector, `vector-move-left!' is
     usually appropriate when
 START1 is greater than START2.
   
 vector-move-right!

 -- Scheme Procedure: vector-move-right! vec1 start1 end1 vec2 start2
     Copy elements from VEC1, positions START1 to END1,
 to VEC2
     starting at position START2.  START1 and
 START2 are inclusive
     indices; END1 is exclusive.
 
 `vector-move-right!' copies
     elements in rightmost order.
 Therefore, in the case where VEC1
     and VEC2 refer to the
 same vector, `vector-move-right!' is
     usually appropriate when
 START1 is less than START2.
   
 generalized-vector?

 -- Scheme Procedure: generalized-vector? obj
     Return `#t' if OBJ is a vector, string,
 bitvector, or uniform
     numeric vector.
   
 generalized-vector-length

 -- Scheme Procedure: generalized-vector-length v
     Return the length of the generalized vector V.
   
 generalized-vector-ref

 -- Scheme Procedure: generalized-vector-ref v idx
     Return the element at index IDX of the
 generalized vector V.
   
 generalized-vector-set!

 -- Scheme Procedure: generalized-vector-set! v idx val
     Set the element at index IDX of the
 generalized vector V to
     VAL.
   
 generalized-vector->list

 -- Scheme Procedure: generalized-vector->list v
     Return a new list whose elements are the elements of the
     generalized vector V.
   
 major-version

 -- Scheme Procedure: major-version
     Return a string containing Guile's major version number.
 E.g.,
     the 1 in "1.6.5".
   
 minor-version

 -- Scheme Procedure: minor-version
     Return a string containing Guile's minor version number.
 E.g.,
     the 6 in "1.6.5".
   
 micro-version

 -- Scheme Procedure: micro-version
     Return a string containing Guile's micro version number.
 E.g.,
     the 5 in "1.6.5".
   
 version

 -- Scheme Procedure: version
 -- Scheme Procedure: major-version
 -- Scheme Procedure: minor-version
 -- Scheme Procedure: micro-version
     Return a string describing Guile's version number, or its major,
     minor
 or micro version number, respectively.
 
          (version) => "1.6.0"
          (major-version) => "1"
          (minor-version) => "6"
          (micro-version) => "0"

 effective-version

 -- Scheme Procedure: effective-version
     Return a string describing Guile's effective version number.
          (version) => "1.6.0"
          (effective-version) => "1.6"
          (major-version) => "1"
          (minor-version) => "6"
          (micro-version) => "0"

 make-soft-port

 -- Scheme Procedure: make-soft-port pv modes
     Return a port capable of receiving or delivering characters as
     specified by the MODES string (*note open-file: File Ports.).  PV
     must be a vector of length 5 or 6.  Its
 components are as
     follows:
 
       0. procedure accepting one character for output

       1. procedure accepting a string for output

       2. thunk for flushing output

       3. thunk for getting one character

       4. thunk for closing port (not by garbage collection)

       5. (if present and not `#f') thunk for computing the number of
          characters that can be read from the port without blocking.
          
 For an output-only port only elements 0, 1, 2, and 4 need
     be
 procedures.  For an input-only port only elements 3 and 4
     need
 be procedures.  Thunks 2 and 4 can instead be `#f' if
     there is no useful operation for them to perform.
 
 If thunk 3
     returns `#f' or an `eof-object'
 (*note eof-object?:
     (r5rs)Input.) it indicates that the port has reached end-of-file.
     For example:
 
          (define stdout (current-output-port))
          (define p (make-soft-port
                     (vector
                      (lambda (c) (write c stdout))
                      (lambda (s) (display s stdout))
                      (lambda () (display "." stdout))
                      (lambda () (char-upcase (read-char)))
                      (lambda () (display "@" stdout)))
                     "rw"))
          
          (write p p) => #<input-output: soft 8081e20>

 make-weak-vector

 -- Scheme Procedure: make-weak-vector size [fill]
     Return a weak vector with SIZE elements. If the optional
     argument FILL is given, all entries in the vector will be
 set to
     FILL. The default value for FILL is the
 empty list.
   
 list->weak-vector

 -- Scheme Procedure: list->weak-vector
     implemented by the C function "scm_weak_vector"
   
 weak-vector

 -- Scheme Procedure: weak-vector . l
 -- Scheme Procedure: list->weak-vector l
     Construct a weak vector from a list: `weak-vector' uses
 the list
     of its arguments while `list->weak-vector' uses
 its only
     argument L (a list) to construct a weak vector
 the same way
     `list->vector' would.
   
 weak-vector?

 -- Scheme Procedure: weak-vector? obj
     Return `#t' if OBJ is a weak vector. Note that all
 weak hashes
     are also weak vectors.
   
 make-weak-key-alist-vector

 -- Scheme Procedure: make-weak-key-alist-vector [size]
 -- Scheme Procedure: make-weak-value-alist-vector size
 -- Scheme Procedure: make-doubly-weak-alist-vector size
     Return a weak hash table with SIZE buckets. As with any
 hash
     table, choosing a good size for the table requires some
     caution.
 
 You can modify weak hash tables in exactly the same
     way you
 would modify regular hash tables. (*note Hash Tables::)
   
 make-weak-value-alist-vector

 -- Scheme Procedure: make-weak-value-alist-vector [size]
     Return a hash table with weak values with SIZE buckets.
 (*note
     Hash Tables::)
   
 make-doubly-weak-alist-vector

 -- Scheme Procedure: make-doubly-weak-alist-vector size
     Return a hash table with weak keys and values with SIZE
 buckets.
     (*note Hash Tables::)
   
 weak-key-alist-vector?

 -- Scheme Procedure: weak-key-alist-vector? obj
 -- Scheme Procedure: weak-value-alist-vector? obj
 -- Scheme Procedure: doubly-weak-alist-vector? obj
     Return `#t' if OBJ is the specified weak hash
 table. Note that a
     doubly weak hash table is neither a weak key
 nor a weak value
     hash table.
   
 weak-value-alist-vector?

 -- Scheme Procedure: weak-value-alist-vector? obj
     Return `#t' if OBJ is a weak value hash table.
   
 doubly-weak-alist-vector?

 -- Scheme Procedure: doubly-weak-alist-vector? obj
     Return `#t' if OBJ is a doubly weak hash table.
   
 array-fill!

 -- Scheme Procedure: array-fill! ra fill
     Store FILL in every element of ARRAY.  The value returned
 is
     unspecified.
   
 array-copy-in-order!

 -- Scheme Procedure: array-copy-in-order!
     implemented by the C function "scm_array_copy_x"
   
 array-copy!

 -- Scheme Procedure: array-copy! src dst
 -- Scheme Procedure: array-copy-in-order! src dst
     Copy every element from vector or array SOURCE to the
     corresponding element of DESTINATION.  DESTINATION must have
 the
     same rank as SOURCE, and be at least as large in each
 dimension.
     The order is unspecified.
   
 array-map-in-order!

 -- Scheme Procedure: array-map-in-order!
     implemented by the C function "scm_array_map_x"
   
 array-map!

 -- Scheme Procedure: array-map! ra0 proc . lra
 -- Scheme Procedure: array-map-in-order! ra0 proc . lra
     ARRAY1, ... must have the same number of dimensions as
 ARRAY0
     and have a range for each index which includes the range
 for the
     corresponding index in ARRAY0.  PROC is applied to
 each tuple of
     elements of ARRAY1 ... and the result is stored
 as the
     corresponding element in ARRAY0.  The value returned is
     unspecified.  The order of application is unspecified.
   
 array-for-each

 -- Scheme Procedure: array-for-each proc ra0 . lra
     Apply PROC to each tuple of elements of ARRAY0 ...
 in row-major
     order.  The value returned is unspecified.
   
 array-index-map!

 -- Scheme Procedure: array-index-map! ra proc
     Apply PROC to the indices of each element of ARRAY in
 turn,
     storing the result in the corresponding element.  The value
     returned and the order of application are unspecified.
 
 One
     can implement ARRAY-INDEXES as
          (define (array-indexes array)
              (let ((ra (apply make-array #f (array-shape array))))
                (array-index-map! ra (lambda x x))
                ra))
     Another example:
          (define (apl:index-generator n)
              (let ((v (make-uniform-vector n 1)))
                (array-index-map! v (lambda (i) i))
                v))

 array?

 -- Scheme Procedure: array? obj [prot]
     Return `#t' if the OBJ is an array, and `#f' if
 not.
   
 typed-array?

 -- Scheme Procedure: typed-array? obj type
     Return `#t' if the OBJ is an array of type
 TYPE, and `#f' if
     not.
   
 array-rank

 -- Scheme Procedure: array-rank array
     Return the number of dimensions of the array ARRAY.
 
   
 array-dimensions

 -- Scheme Procedure: array-dimensions ra
     `array-dimensions' is similar to `array-shape' but replaces
     elements with a `0' minimum with one greater than the maximum.
     So:
          (array-dimensions (make-array 'foo '(-1 3) 5)) => ((-1 3) 5)

 shared-array-root

 -- Scheme Procedure: shared-array-root ra
     Return the root vector of a shared array.
   
 shared-array-offset

 -- Scheme Procedure: shared-array-offset ra
     Return the root vector index of the first element in the array.
   
 shared-array-increments

 -- Scheme Procedure: shared-array-increments ra
     For each dimension, return the distance between elements in the
     root vector.
   
 make-typed-array

 -- Scheme Procedure: make-typed-array type fill . bounds
     Create and return an array of type TYPE.
   
 make-array

 -- Scheme Procedure: make-array fill . bounds
     Create and return an array.
   
 dimensions->uniform-array

 -- Scheme Procedure: dimensions->uniform-array dims prot [fill]
 -- Scheme Procedure: make-uniform-vector length prototype [fill]
     Create and return a uniform array or vector of type
     corresponding to PROTOTYPE with dimensions DIMS or
 length
     LENGTH.  If FILL is supplied, it's used to
 fill the array,
     otherwise PROTOTYPE is used.
   
 make-shared-array

 -- Scheme Procedure: make-shared-array oldra mapfunc . dims
     `make-shared-array' can be used to create shared subarrays of
     other
 arrays.  The MAPPER is a function that translates
     coordinates in
 the new array into coordinates in the old array.
     A MAPPER must be
 linear, and its range must stay within the
     bounds of the old array, but
 it can be otherwise arbitrary.  A
     simple example:
          (define fred (make-array #f 8 8))
          (define freds-diagonal
            (make-shared-array fred (lambda (i) (list i i)) 8))
          (array-set! freds-diagonal 'foo 3)
          (array-ref fred 3 3) => foo
          (define freds-center
            (make-shared-array fred (lambda (i j) (list (+ 3 i) (+ 3 j))) 2 2))
          (array-ref freds-center 0 0) => foo

 transpose-array

 -- Scheme Procedure: transpose-array ra . args
     Return an array sharing contents with ARRAY, but with
 dimensions
     arranged in a different order.  There must be one
 DIM argument
     for each dimension of ARRAY.
 DIM0, DIM1, ... should be integers
     between 0
 and the rank of the array to be returned.  Each
     integer in that
 range must appear at least once in the argument
     list.
 
 The values of DIM0, DIM1, ... correspond to
     dimensions in the array to be returned, their positions in the
     argument list to dimensions of ARRAY.  Several DIMs
 may have the
     same value, in which case the returned array will
 have smaller
     rank than ARRAY.
 
          (transpose-array '#2((a b) (c d)) 1 0) => #2((a c) (b d))
          (transpose-array '#2((a b) (c d)) 0 0) => #1(a d)
          (transpose-array '#3(((a b c) (d e f)) ((1 2 3) (4 5 6))) 1 1 0) =>
                          #2((a 4) (b 5) (c 6))

 enclose-array

 -- Scheme Procedure: enclose-array ra . axes
     DIM0, DIM1 ... should be nonnegative integers less than
 the rank
     of ARRAY.  ENCLOSE-ARRAY returns an array
 resembling an array of
     shared arrays.  The dimensions of each shared
 array are the same
     as the DIMth dimensions of the original array,
 the dimensions of
     the outer array are the same as those of the original
 array that
     did not match a DIM.
 
 An enclosed array is not a general
     Scheme array.  Its elements may not
 be set using `array-set!'.
     Two references to the same element of
 an enclosed array will be
     `equal?' but will not in general be
 `eq?'.  The value returned
     by ARRAY-PROTOTYPE when given an
 enclosed array is unspecified.
     
 examples:
          (enclose-array '#3(((a b c) (d e f)) ((1 2 3) (4 5 6))) 1) =>
             #<enclosed-array (#1(a d) #1(b e) #1(c f)) (#1(1 4) #1(2 5) #1(3 6))>
          
          (enclose-array '#3(((a b c) (d e f)) ((1 2 3) (4 5 6))) 1 0) =>
             #<enclosed-array #2((a 1) (d 4)) #2((b 2) (e 5)) #2((c 3) (f 6))>

 array-in-bounds?

 -- Scheme Procedure: array-in-bounds? v . args
     Return `#t' if its arguments would be acceptable to
     `array-ref'.
   
 array-ref

 -- Scheme Procedure: array-ref v . args
     Return the element at the `(index1, index2)' element in
 ARRAY.
   
 array-set!

 -- Scheme Procedure: array-set! v obj . args
     Set the element at the `(index1, index2)' element in ARRAY to
     NEW-VALUE.  The value returned by array-set! is unspecified.
   
 array-contents

 -- Scheme Procedure: array-contents ra [strict]
     If ARRAY may be "unrolled" into a one dimensional shared array
     without changing their order (last subscript changing fastest),
     then
 `array-contents' returns that shared array, otherwise it
     returns
 `#f'.  All arrays made by MAKE-ARRAY and
     MAKE-UNIFORM-ARRAY may be unrolled, some arrays made by
     MAKE-SHARED-ARRAY may not be.
 
 If the optional argument STRICT
     is provided, a shared array will
 be returned only if its
     elements are stored internally contiguous in
 memory.
   
 uniform-array-read!

 -- Scheme Procedure: uniform-array-read! ura [port_or_fd [start [end]]]
 -- Scheme Procedure: uniform-vector-read! uve [port-or-fdes] [start]
          [end]
     Attempt to read all elements of URA, in lexicographic order, as
     binary objects from PORT-OR-FDES.
 If an end of file is
     encountered,
 the objects up to that point are put into URA
     (starting at the beginning) and the remainder of the array is
     unchanged.
 
 The optional arguments START and END allow
 a
     specified region of a vector (or linearized array) to be read,
     leaving the remainder of the vector unchanged.
 
     `uniform-array-read!' returns the number of objects read.
     PORT-OR-FDES may be omitted, in which case it defaults to the
     value
 returned by `(current-input-port)'.
   
 uniform-array-write

 -- Scheme Procedure: uniform-array-write ura [port_or_fd [start [end]]]
     Writes all elements of URA as binary objects to
 PORT-OR-FDES.
     
 The optional arguments START
 and END allow
 a specified
     region of a vector (or linearized array) to be written.
 
 The
     number of objects actually written is returned.
 PORT-OR-FDES may
     be
 omitted, in which case it defaults to the value returned by
     `(current-output-port)'.
   
 bitvector?

 -- Scheme Procedure: bitvector? obj
     Return `#t' when OBJ is a bitvector, else
 return `#f'.
   
 make-bitvector

 -- Scheme Procedure: make-bitvector len [fill]
     Create a new bitvector of length LEN and
 optionally initialize
     all elements to FILL.
   
 bitvector

 -- Scheme Procedure: bitvector . bits
     Create a new bitvector with the arguments as elements.
   
 bitvector-length

 -- Scheme Procedure: bitvector-length vec
     Return the length of the bitvector VEC.
   
 bitvector-ref

 -- Scheme Procedure: bitvector-ref vec idx
     Return the element at index IDX of the bitvector
 VEC.
   
 bitvector-set!

 -- Scheme Procedure: bitvector-set! vec idx val
     Set the element at index IDX of the bitvector
 VEC when VAL is
     true, else clear it.
   
 bitvector-fill!

 -- Scheme Procedure: bitvector-fill! vec val
     Set all elements of the bitvector
 VEC when VAL is true, else
     clear them.
   
 list->bitvector

 -- Scheme Procedure: list->bitvector list
     Return a new bitvector initialized with the elements
 of LIST.
   
 bitvector->list

 -- Scheme Procedure: bitvector->list vec
     Return a new list initialized with the elements
 of the bitvector
     VEC.
   
 bit-count

 -- Scheme Procedure: bit-count b bitvector
     Return the number of occurrences of the boolean B in
 BITVECTOR.
   
 bit-position

 -- Scheme Procedure: bit-position item v k
     Return the index of the first occurrance of ITEM in bit
 vector
     V, starting from K.  If there is no
 ITEM entry between K and the
     end of
 BITVECTOR, then return `#f'.  For example,
 
          (bit-position #t #*000101 0)  => 3
          (bit-position #f #*0001111 3) => #f

 bit-set*!

 -- Scheme Procedure: bit-set*! v kv obj
     Set entries of bit vector V to OBJ, with KV
 selecting the
     entries to change.  The return value is
 unspecified.
 
 If KV
     is a bit vector, then those entries where it has
 `#t' are the
     ones in V which are set to OBJ.
 KV and V must be the same
     length.  When OBJ
 is `#t' it's like KV is OR'ed into V.  Or
     when
 OBJ is `#f' it can be seen as an ANDNOT.
 
          (define bv #*01000010)
          (bit-set*! bv #*10010001 #t)
          bv
          => #*11010011
     
 If KV is a u32vector, then its elements are
 indices into V
     which are set to OBJ.
 
          (define bv #*01000010)
          (bit-set*! bv #u32(5 2 7) #t)
          bv
          => #*01100111

 bit-count*

 -- Scheme Procedure: bit-count* v kv obj
     Return a count of how many entries in bit vector V are
 equal to
     OBJ, with KV selecting the entries to
 consider.
 
 If KV is a
     bit vector, then those entries where it has
 `#t' are the ones in
     V which are considered.
 KV and V must be the same length.
 
     If KV is a u32vector, then it contains
 the indexes in V to
     consider.
 
 For example,
 
          (bit-count* #*01110111 #*11001101 #t) => 3
          (bit-count* #*01110111 #u32(7 0 4) #f)  => 2

 bit-invert!

 -- Scheme Procedure: bit-invert! v
     Modify the bit vector V by replacing each element with
 its
     negation.
   
 array->list

 -- Scheme Procedure: array->list v
     Return a list consisting of all the elements, in order, of
     ARRAY.
   
 list->typed-array

 -- Scheme Procedure: list->typed-array type shape lst
     Return an array of the type TYPE
 with elements the same as those
     of LST.
 
 The argument SHAPE determines the number of
     dimensions
 of the array and their shape.  It is either an exact
     integer,
 giving the
 number of dimensions directly, or a list
     whose length
 specifies the number of dimensions and each element
     specified
 the lower and optionally the upper bound of the
     corresponding
 dimension.
 When the element is list of two
     elements, these elements
 give the lower and upper bounds.  When
     it is an exact
 integer, it gives only the lower bound.
   
 list->array

 -- Scheme Procedure: list->array ndim lst
     Return an array with elements the same as those of LST.
   
 list->uniform-array

 -- Scheme Procedure: list->uniform-array ndim prot lst
     Return a uniform array of the type indicated by prototype
 PROT
     with elements the same as those of LST.
 Elements must be of the
     appropriate type, no coercions are
 done.
 
 The argument NDIM
     determines the number of dimensions
 of the array.  It is either
     an exact integer, giving the
 number directly, or a list of exact
     integers, whose length
 specifies the number of dimensions and
     each element is the
 lower index bound of its dimension.
   
 array-type

 -- Scheme Procedure: array-type ra
     
   
 array-prototype

 -- Scheme Procedure: array-prototype ra
     Return an object that would produce an array of the same type
 as
     ARRAY, if used as the PROTOTYPE for
 `make-uniform-array'.
   
 dynamic-link

 -- Scheme Procedure: dynamic-link filename
     Find the shared object (shared library) denoted by
 FILENAME and
     link it into the running Guile
 application.  The returned
     scheme object is a "handle" for the library which can
 be passed
     to `dynamic-func', `dynamic-call' etc.
 
 Searching for object
     files is system dependent.  Normally,
 if FILENAME does have an
     explicit directory it will
 be searched for in locations
 such
     as `/usr/lib' and `/usr/local/lib'.
   
 dynamic-object?

 -- Scheme Procedure: dynamic-object? obj
     Return `#t' if OBJ is a dynamic object handle,
 or `#f'
     otherwise.
   
 dynamic-unlink

 -- Scheme Procedure: dynamic-unlink dobj
     Unlink a dynamic object from the application, if possible.  The
     object must have been linked by `dynamic-link', with 
 DOBJ the
     corresponding handle.  After this procedure
 is called, the
     handle can no longer be used to access the
 object.
   
 dynamic-func

 -- Scheme Procedure: dynamic-func name dobj
     Return a "handle" for the function NAME in the
 shared object
     referred to by DOBJ.  The handle
 can be passed to `dynamic-call'
     to actually
 call the function.
 
 Regardless whether your C
     compiler prepends an underscore
 `_' to the global names in a
     program, you should
 *not* include this underscore in NAME
     since it will be added automatically when necessary.
   
 dynamic-call

 -- Scheme Procedure: dynamic-call func dobj
     Call a C function in a dynamic object.  Two styles of
 invocation
     are supported:
 
        * FUNC can be a function handle returned by
 `dynamic-func'.
          In this case DOBJ is
 ignored

        * FUNC can be a string with the name of the
 function to call,
          with DOBJ the handle of the
 dynamic object in which to find
          the function.
 This is equivalent to
               
               (dynamic-call (dynamic-func FUNC DOBJ) #f)
     
 In either case, the function is passed no arguments
 and its
     return value is ignored.
   
 dynamic-args-call

 -- Scheme Procedure: dynamic-args-call func dobj args
     Call the C function indicated by FUNC and DOBJ,
 just like
     `dynamic-call', but pass it some arguments and
 return its return
     value.  The C function is expected to take
 two arguments and
     return an `int', just like `main':
          int c_func (int argc, char **argv);
     
 The parameter ARGS must be a list of strings and is
 converted
     into an array of `char *'.  The array is passed
 in ARGV and its
     size in ARGC.  The return value is
 converted to a Scheme number
     and returned from the call to
 `dynamic-args-call'.
   
 chmod

 -- Scheme Procedure: chmod object mode
     Changes the permissions of the file referred to by OBJ.
 OBJ can
     be a string containing a file name or a port or integer file
     descriptor which is open on a file (in which case `fchmod' is
     used
 as the underlying system call).
 MODE specifies
 the new
     permissions as a decimal number, e.g., `(chmod "foo" #o755)'.
     The return value is unspecified.
   
 umask

 -- Scheme Procedure: umask [mode]
     If MODE is omitted, returns a decimal number representing the
     current
 file creation mask.  Otherwise the file creation mask is
     set to
 MODE and the previous value is returned.
 
 E.g.,
     `(umask #o022)' sets the mask to octal 22, decimal 18.
   
 open-fdes

 -- Scheme Procedure: open-fdes path flags [mode]
     Similar to `open' but return a file descriptor instead of
 a
     port.
   
 open

 -- Scheme Procedure: open path flags [mode]
     Open the file named by PATH for reading and/or writing.
 FLAGS is
     an integer specifying how the file should be opened.
 MODE is an
     integer specifying the permission bits of the file, if
 it needs
     to be created, before the umask is applied.  The default is 666
     (Unix itself has no default).
 
 FLAGS can be constructed by
     combining variables using `logior'.
 Basic flags are:
 

      -- Variable: O_RDONLY
          Open the file read-only.

      -- Variable: O_WRONLY
          Open the file write-only.

      -- Variable: O_RDWR
          Open the file read/write.

      -- Variable: O_APPEND
          Append to the file instead of truncating.

      -- Variable: O_CREAT
          Create the file if it does not already exist.
     
 See the Unix documentation of the `open' system call
 for
     additional flags.
   
 close

 -- Scheme Procedure: close fd_or_port
     Similar to close-port (*note close-port: Closing.),
 but also
     works on file descriptors.  A side
 effect of closing a file
     descriptor is that any ports using that file
 descriptor are
     moved to a different file descriptor and have
 their revealed
     counts set to zero.
   
 close-fdes

 -- Scheme Procedure: close-fdes fd
     A simple wrapper for the `close' system call.
 Close file
     descriptor FD, which must be an integer.
 Unlike close (*note
     close: Ports and File Descriptors.),
 the file descriptor will be
     closed even if a port is using it.
 The return value is
     unspecified.
   
 stat

 -- Scheme Procedure: stat object
     Return an object containing various information about the file
     determined by OBJ.  OBJ can be a string containing
 a file name
     or a port or integer file descriptor which is open
 on a file (in
     which case `fstat' is used as the underlying
 system call).
 
     The object returned by `stat' can be passed as a single
     parameter to the following procedures, all of which return
     integers:
 
    `stat:dev'
          The device containing the file.

    `stat:ino'
          The file serial number, which distinguishes this file from
          all
 other files on the same device.

    `stat:mode'
          The mode of the file.  This includes file type information
          and
 the file permission bits.  See `stat:type' and
          `stat:perms' below.

    `stat:nlink'
          The number of hard links to the file.

    `stat:uid'
          The user ID of the file's owner.

    `stat:gid'
          The group ID of the file.

    `stat:rdev'
          Device ID; this entry is defined only for character or block
          special files.

    `stat:size'
          The size of a regular file in bytes.

    `stat:atime'
          The last access time for the file.

    `stat:mtime'
          The last modification time for the file.

    `stat:ctime'
          The last modification time for the attributes of the file.

    `stat:blksize'
          The optimal block size for reading or writing the file, in
          bytes.

    `stat:blocks'
          The amount of disk space that the file occupies measured in
          units of 512 byte blocks.
     
 In addition, the following procedures return the information
     from stat:mode in a more convenient form:
 
    `stat:type'
          A symbol representing the type of file.  Possible values are
          regular, directory, symlink, block-special, char-special,
          fifo,
 socket and unknown

    `stat:perms'
          An integer representing the access permission bits.

 rename-file

 -- Scheme Procedure: rename-file oldname newname
     Renames the file specified by OLDNAME to NEWNAME.
 The return
     value is unspecified.
   
 delete-file

 -- Scheme Procedure: delete-file str
     Deletes (or "unlinks") the file specified by PATH.
   
 mkdir

 -- Scheme Procedure: mkdir path [mode]
     Create a new directory named by PATH.  If MODE is omitted
 then
     the permissions of the directory file are set using the current
     umask.  Otherwise they are set to the decimal value specified
     with
 MODE.  The return value is unspecified.
   
 rmdir

 -- Scheme Procedure: rmdir path
     Remove the existing directory named by PATH.  The directory must
     be empty for this to succeed.  The return value is unspecified.
   
 directory-stream?

 -- Scheme Procedure: directory-stream? obj
     Return a boolean indicating whether OBJECT is a directory
 stream
     as returned by `opendir'.
   
 opendir

 -- Scheme Procedure: opendir dirname
     Open the directory specified by PATH and return a directory
     stream.
   
 readdir

 -- Scheme Procedure: readdir port
     Return (as a string) the next directory entry from the directory
     stream
 STREAM.  If there is no remaining entry to be read then
     the
 end of file object is returned.
   
 rewinddir

 -- Scheme Procedure: rewinddir port
     Reset the directory port STREAM so that the next call to
     `readdir' will return the first directory entry.
   
 closedir

 -- Scheme Procedure: closedir port
     Close the directory stream STREAM.
 The return value is
     unspecified.
   
 chdir

 -- Scheme Procedure: chdir str
     Change the current working directory to PATH.
 The return value
     is unspecified.
   
 getcwd

 -- Scheme Procedure: getcwd
     Return the name of the current working directory.
   
 fsync

 -- Scheme Procedure: fsync object
     Copies any unwritten data for the specified output file descriptor
     to disk.
 If PORT/FD is a port, its buffer is flushed before the
     underlying
 file descriptor is fsync'd.
 The return value is
     unspecified.
   
 copy-file

 -- Scheme Procedure: copy-file oldfile newfile
     Copy the file specified by PATH-FROM to PATH-TO.
 The return
     value is unspecified.
   
 dirname

 -- Scheme Procedure: dirname filename
     Return the directory name component of the file name
 FILENAME.
     If FILENAME does not contain a directory
 component, `.' is
     returned.
   
 basename

 -- Scheme Procedure: basename filename [suffix]
     Return the base name of the file name FILENAME. The
 base name is
     the file name without any directory components.
 If SUFFIX is
     provided, and is equal to the end of
 BASENAME, it is removed
     also.
   
 pipe

 -- Scheme Procedure: pipe
     Return a newly created pipe: a pair of ports which are linked
     together on the local machine.  The _car_ is the input
 port and
     the _cdr_ is the output port.  Data written (and
 flushed) to the
     output port can be read from the input port.
 Pipes are commonly
     used for communication with a newly forked
 child process.  The
     need to flush the output port can be
 avoided by making it
     unbuffered using `setvbuf'.
 
 Writes occur atomically provided
     the size of the data in bytes
 is not greater than the value of
     `PIPE_BUF'.  Note that
 the output port is likely to block if too
     much data (typically
 equal to `PIPE_BUF') has been written but
     not yet read
 from the input port.
   
 kill

 -- Scheme Procedure: kill pid sig
     Sends a signal to the specified process or group of processes.
 
     PID specifies the processes to which the signal is sent:
 
    PID greater than 0
          The process whose identifier is PID.

    PID equal to 0
          All processes in the current process group.

    PID less than -1
          The process group whose identifier is -PID

    PID equal to -1
          If the process is privileged, all processes except for some
          special
 system processes.  Otherwise, all processes with
          the current effective
 user ID.
     
 SIG should be specified using a variable corresponding to
 the
     Unix symbolic name, e.g.,
 

      -- Variable: SIGHUP
          Hang-up signal.
     

      -- Variable: SIGINT
          Interrupt signal.

 execl

 -- Scheme Procedure: execl filename . args
     Executes the file named by PATH as a new process image.
 The
     remaining arguments are supplied to the process; from a C program
     they are accessible as the `argv' argument to `main'.
     Conventionally the first ARG is the same as PATH.
 All arguments
     must be strings.
 
 If ARG is missing, PATH is executed with a
     null
 argument list, which may have system-dependent
     side-effects.
 
 This procedure is currently implemented using
     the `execv' system
 call, but we call it `execl' because of its
     Scheme calling interface.
   
 execlp

 -- Scheme Procedure: execlp filename . args
     Similar to `execl', however if
 FILENAME does not contain a
     slash
 then the file to execute will be located by searching the
     directories listed in the `PATH' environment variable.
 
 This
     procedure is currently implemented using the `execvp' system
     call, but we call it `execlp' because of its Scheme calling
     interface.
   
 execle

 -- Scheme Procedure: execle filename env . args
     Similar to `execl', but the environment of the new process is
     specified by ENV, which must be a list of strings as returned by
     the
 `environ' procedure.
 
 This procedure is currently
     implemented using the `execve' system
 call, but we call it
     `execle' because of its Scheme calling interface.
   
 uname

 -- Scheme Procedure: uname
     Return an object with some information about the computer
 system
     the program is running on.
   
 environ

 -- Scheme Procedure: environ [env]
     If ENV is omitted, return the current environment (in the
 Unix
     sense) as a list of strings.  Otherwise set the current
     environment, which is also the default environment for child
     processes, to the supplied list of strings.  Each member of
 ENV
     should be of the form `NAME=VALUE' and values of
 `NAME' should
     not be duplicated.  If ENV is supplied
 then the return value is
     unspecified.
   
 tmpnam

 -- Scheme Procedure: tmpnam
     Return a name in the file system that does not match any
     existing file.  However there is no guarantee that another
     process will not create the file after `tmpnam' is called.
 Care
     should be taken if opening the file, e.g., use the
 `O_EXCL' open
     flag or use `mkstemp!' instead.
   
 mkstemp!

 -- Scheme Procedure: mkstemp! tmpl
     Create a new unique file in the file system and return a new
     buffered port open for reading and writing to the file.
 
 TMPL
     is a string specifying where the file should be
 created: it must
     end with `XXXXXX' and those `X's
 will be changed in the string
     to return the name of the file.
 (`port-filename' on the port
     also gives the name.)
 
 POSIX doesn't specify the permissions
     mode of the file, on GNU
 and most systems it's `#o600'.  An
     application can use
 `chmod' to relax that if desired.  For
     example
 `#o666' less `umask', which is usual for ordinary
 file
     creation,
 
          (let ((port (mkstemp! (string-copy "/tmp/myfile-XXXXXX"))))
            (chmod port (logand #o666 (lognot (umask))))
            ...)

 utime

 -- Scheme Procedure: utime pathname [actime [modtime]]
     `utime' sets the access and modification times for the
 file
     named by PATH.  If ACTIME or MODTIME is
 not supplied, then the
     current time is used.  ACTIME and
 MODTIME must be integer time
     values as returned by the
 `current-time' procedure.
          (utime "foo" (- (current-time) 3600))
     will set the access time to one hour in the past and the
     modification time to the current time.
   
 access?

 -- Scheme Procedure: access? path how
     Test accessibility of a file under the real UID and GID of the
     calling process.  The return is `#t' if PATH exists
 and the
     permissions requested by HOW are all allowed, or
 `#f' if not.
     
 HOW is an integer which is one of the following values,
 or a
     bitwise-OR (`logior') of multiple values.
 

      -- Variable: R_OK
          Test for read permission.

      -- Variable: W_OK
          Test for write permission.

      -- Variable: X_OK
          Test for execute permission.

      -- Variable: F_OK
          Test for existence of the file.  This is implied by each of
          the
 other tests, so there's no need to combine it with
          them.
     
 It's important to note that `access?' does not simply
     indicate what will happen on attempting to read or write a
 file.
     In normal circumstances it does, but in a set-UID or
 set-GID
     program it doesn't because `access?' tests the
 real ID, whereas
     an open or execute attempt uses the effective
 ID.
 
 A program
     which will never run set-UID/GID can ignore the
 difference
     between real and effective IDs, but for maximum
 generality,
     especially in library functions, it's best not to
 use `access?'
     to predict the result of an open or execute,
 instead simply
     attempt that and catch any exception.
 
 The main use for
     `access?' is to let a set-UID/GID program
 determine what the
     invoking user would have been allowed to do,
 without the greater
     (or perhaps lesser) privileges afforded by
 the effective ID.
     For more on this, see "Testing File
 Access" in The GNU C Library
     Reference Manual.
   
 getpid

 -- Scheme Procedure: getpid
     Return an integer representing the current process ID.
   
 putenv

 -- Scheme Procedure: putenv str
     Modifies the environment of the current process, which is
 also
     the default environment inherited by child processes.
 
 If
     STRING is of the form `NAME=VALUE' then it will be written
     directly into the environment, replacing any existing environment
     string
 with
 name matching `NAME'.  If STRING does not contain
     an equal
 sign, then any existing string with name matching
     STRING will
 be removed.
 
 The return value is unspecified.
   
 setlocale

 -- Scheme Procedure: setlocale category [locale]
     If LOCALE is omitted, return the current value of the
 specified
     locale category as a system-dependent string.
 CATEGORY should be
     specified using the values
 `LC_COLLATE', `LC_ALL' etc.
 
     Otherwise the specified locale category is set to the string
     LOCALE and the new value is returned as a
 system-dependent
     string.  If LOCALE is an empty string,
 the locale will be set
     using environment variables.
   
 getlogin

 -- Scheme Procedure: getlogin
     Return a string containing the name of the user logged in on
 the
     controlling terminal of the process, or `#f' if this
 information
     cannot be obtained.
   
 flock

 -- Scheme Procedure: flock file operation
     Apply or remove an advisory lock on an open file.
 OPERATION
     specifies the action to be done:
 

      -- Variable: LOCK_SH
          Shared lock.  More than one process may hold a shared lock
          for a given file at a given time.

      -- Variable: LOCK_EX
          Exclusive lock.  Only one process may hold an exclusive lock
          for a given file at a given time.

      -- Variable: LOCK_UN
          Unlock the file.

      -- Variable: LOCK_NB
          Don't block when locking.  This is combined with one of the
          other operations using `logior'.  If `flock' would
 block an
          `EWOULDBLOCK' error is thrown.
     
 The return value is not specified. FILE may be an open
 file
     descriptor or an open file descriptor port.
 
 Note that `flock'
     does not lock files across NFS.
   
 gethost

 -- Scheme Procedure: gethost [host]
 -- Scheme Procedure: gethostbyname hostname
 -- Scheme Procedure: gethostbyaddr address
     Look up a host by name or address, returning a host object.  The
     `gethost' procedure will accept either a string name or an
     integer
 address; if given no arguments, it behaves like
     `gethostent' (see
 below).  If a name or address is supplied but
     the address can not be
 found, an error will be thrown to one of
     the keys:
 `host-not-found', `try-again', `no-recovery' or
     `no-data', corresponding to the equivalent `h_error' values.
     Unusual conditions may result in errors thrown to the
     `system-error' or `misc_error' keys.
   
 getproto

 -- Scheme Procedure: getproto [protocol]
 -- Scheme Procedure: getprotobyname name
 -- Scheme Procedure: getprotobynumber number
     Look up a network protocol by name or by number.
     `getprotobyname'
 takes a string argument, and `getprotobynumber'
     takes an integer
 argument.  `getproto' will accept either type,
     behaving like
 `getprotoent' (see below) if no arguments are
     supplied.
   
 getserv

 -- Scheme Procedure: getserv [name [protocol]]
 -- Scheme Procedure: getservbyname name protocol
 -- Scheme Procedure: getservbyport port protocol
     Look up a network service by name or by service number, and return
     a
 network service object.  The PROTOCOL argument specifies the
     name
 of the desired protocol; if the protocol found in the
     network service
 database does not match this name, a system
     error is signalled.
 
 The `getserv' procedure will take either
     a service name or number
 as its first argument; if given no
     arguments, it behaves like
 `getservent' (see below).
   
 setproto

 -- Scheme Procedure: setproto [stayopen]
     If STAYOPEN is omitted, this is equivalent to `endprotoent'.
     Otherwise it is equivalent to `setprotoent stayopen'.
   
 setserv

 -- Scheme Procedure: setserv [stayopen]
     If STAYOPEN is omitted, this is equivalent to `endservent'.
     Otherwise it is equivalent to `setservent stayopen'.
   
 htons

 -- Scheme Procedure: htons value
     Convert a 16 bit quantity from host to network byte ordering.
     VALUE is packed into 2 bytes, which are then converted
 and
     returned as a new integer.
   
 ntohs

 -- Scheme Procedure: ntohs value
     Convert a 16 bit quantity from network to host byte ordering.
     VALUE is packed into 2 bytes, which are then converted
 and
     returned as a new integer.
   
 htonl

 -- Scheme Procedure: htonl value
     Convert a 32 bit quantity from host to network byte ordering.
     VALUE is packed into 4 bytes, which are then converted
 and
     returned as a new integer.
   
 ntohl

 -- Scheme Procedure: ntohl value
     Convert a 32 bit quantity from network to host byte ordering.
     VALUE is packed into 4 bytes, which are then converted
 and
     returned as a new integer.
   
 inet-aton

 -- Scheme Procedure: inet-aton address
     Convert an IPv4 Internet address from printable string
 (dotted
     decimal notation) to an integer.  E.g.,
 
          (inet-aton "127.0.0.1") => 2130706433

 inet-ntoa

 -- Scheme Procedure: inet-ntoa inetid
     Convert an IPv4 Internet address to a printable
 (dotted decimal
     notation) string.  E.g.,
 
          (inet-ntoa 2130706433) => "127.0.0.1"

 socket

 -- Scheme Procedure: socket family style proto
     Return a new socket port of the type specified by FAMILY,
 STYLE
     and PROTO.  All three parameters are
 integers.  Supported values
     for FAMILY are
 `AF_UNIX', `AF_INET' and `AF_INET6'.
 Typical
     values for STYLE are `SOCK_STREAM',
 `SOCK_DGRAM' and
     `SOCK_RAW'.
 
 PROTO can be obtained from a protocol name using
     `getprotobyname'.  A value of zero specifies the default
     protocol, which is usually right.
 
 A single socket port cannot
     by used for communication until it
 has been connected to another
     socket.
   
 getsockopt

 -- Scheme Procedure: getsockopt sock level optname
     Return an option value from socket port SOCK.
 
 LEVEL is an
     integer specifying a protocol layer, either
 `SOL_SOCKET' for
     socket level options, or a protocol
 number from the `IPPROTO'
     constants or `getprotoent'
 (*note Network Databases::).
 

      -- Variable: SOL_SOCKET
      -- Variable: IPPROTO_IP
      -- Variable: IPPROTO_TCP
      -- Variable: IPPROTO_UDP
     
 OPTNAME is an integer specifying an option within the
     protocol layer.
 
 For `SOL_SOCKET' level the following OPTNAMEs
     are
 defined (when provided by the system).  For their meaning
     see
 *note Socket-Level Options: (libc)Socket-Level Options, or
     `man 7 socket'.
 

      -- Variable: SO_DEBUG
      -- Variable: SO_REUSEADDR
      -- Variable: SO_STYLE
      -- Variable: SO_TYPE
      -- Variable: SO_ERROR
      -- Variable: SO_DONTROUTE
      -- Variable: SO_BROADCAST
      -- Variable: SO_SNDBUF
      -- Variable: SO_RCVBUF
      -- Variable: SO_KEEPALIVE
      -- Variable: SO_OOBINLINE
      -- Variable: SO_NO_CHECK
      -- Variable: SO_PRIORITY
          The value returned is an integer.
     

      -- Variable: SO_LINGER
          The VALUE returned is a pair of integers
 `(ENABLE .
          TIMEOUT)'.  On old systems without
 timeout support (ie.
          without `struct linger'), only
 ENABLE has an effect but the
          value in Guile is always a
 pair.

 setsockopt

 -- Scheme Procedure: setsockopt sock level optname value
     Set an option on socket port SOCK.  The return value is
     unspecified.
 
 LEVEL is an integer specifying a protocol layer,
     either
 `SOL_SOCKET' for socket level options, or a protocol
     number from the `IPPROTO' constants or `getprotoent'
 (*note
     Network Databases::).
 

      -- Variable: SOL_SOCKET
      -- Variable: IPPROTO_IP
      -- Variable: IPPROTO_TCP
      -- Variable: IPPROTO_UDP
     
 OPTNAME is an integer specifying an option within the
     protocol layer.
 
 For `SOL_SOCKET' level the following OPTNAMEs
     are
 defined (when provided by the system).  For their meaning
     see
 *note Socket-Level Options: (libc)Socket-Level Options, or
     `man 7 socket'.
 

      -- Variable: SO_DEBUG
      -- Variable: SO_REUSEADDR
      -- Variable: SO_STYLE
      -- Variable: SO_TYPE
      -- Variable: SO_ERROR
      -- Variable: SO_DONTROUTE
      -- Variable: SO_BROADCAST
      -- Variable: SO_SNDBUF
      -- Variable: SO_RCVBUF
      -- Variable: SO_KEEPALIVE
      -- Variable: SO_OOBINLINE
      -- Variable: SO_NO_CHECK
      -- Variable: SO_PRIORITY
          VALUE is an integer.
     

      -- Variable: SO_LINGER
          VALUE is a pair of integers `(ENABLE
 . TIMEOUT)'.  On old
          systems without timeout support
 (ie. without `struct
          linger'), only ENABLE has an
 effect but the value in Guile
          is always a pair.
     
 For IP level (`IPPROTO_IP') the following OPTNAMEs
 are
     defined (when provided by the system).  See `man
 ip' for what
     they mean.
 

      -- Variable: IP_ADD_MEMBERSHIP
      -- Variable: IP_DROP_MEMBERSHIP
          These can be used only with `setsockopt', not
 `getsockopt'.
          VALUE is a pair
 `(MULTIADDR . INTERFACEADDR)' of IPv4
          addresses (*note Network Address Conversion::).
 MULTIADDR
          is a multicast address to be added to or
 dropped from the
          interface INTERFACEADDR.
 INTERFACEADDR can be `INADDR_ANY'
          to have the system
 select the interface.  INTERFACEADDR can
          also be an
 interface index number, on systems supporting
          that.

 shutdown

 -- Scheme Procedure: shutdown sock how
     Sockets can be closed simply by using `close-port'. The
     `shutdown' procedure allows reception or transmission on a
     connection to be shut down individually, according to the
     parameter
 HOW:
 
    0
          Stop receiving data for this socket.  If further data
          arrives,  reject it.

    1
          Stop trying to transmit data from this socket.  Discard any
          data waiting to be sent.  Stop looking for acknowledgement
          of
 data already sent; don't retransmit it if it is lost.

    2
          Stop both reception and transmission.
     
 The return value is unspecified.
   
 connect

 -- Scheme Procedure: connect sock fam_or_sockaddr [address . args]
     Initiate a connection from a socket using a specified address
     family to the address
 specified by ADDRESS and possibly ARGS.
     The format required for ADDRESS
 and ARGS depends on the family
     of the socket.
 
 For a socket of family `AF_UNIX',
 only
     ADDRESS is specified and must be a string with the
 filename
     where the socket is to be created.
 
 For a socket of family
     `AF_INET',
 ADDRESS must be an integer IPv4 host address and
     ARGS must be a single integer port number.
 
 For a socket of
     family `AF_INET6',
 ADDRESS must be an integer IPv6 host address
     and
 ARGS may be up to three integers:
 port [flowinfo]
     [scope_id],
 where flowinfo and scope_id default to zero.
 
     Alternatively, the second argument can be a socket address object
     as returned by `make-socket-address', in which case the no
     additional arguments should be passed.
 
 The return value is
     unspecified.
   
 bind

 -- Scheme Procedure: bind sock fam_or_sockaddr [address . args]
     Assign an address to the socket port SOCK.
 Generally this only
     needs to be done for server sockets,
 so they know where to look
     for incoming connections.  A socket
 without an address will be
     assigned one automatically when it
 starts communicating.
 
     The format of ADDRESS and ARGS depends
 on the family of the
     socket.
 
 For a socket of family `AF_UNIX', only ADDRESS
 is
     specified and must be a string with the filename where
 the
     socket is to be created.
 
 For a socket of family `AF_INET',
     ADDRESS
 must be an integer IPv4 address and ARGS
 must be a
     single integer port number.
 
 The values of the following
     variables can also be used for
 ADDRESS:
 

      -- Variable: INADDR_ANY
          Allow connections from any address.
     

      -- Variable: INADDR_LOOPBACK
          The address of the local host using the loopback device.
     

      -- Variable: INADDR_BROADCAST
          The broadcast address on the local network.
     

      -- Variable: INADDR_NONE
          No address.
     
 For a socket of family `AF_INET6', ADDRESS
 must be an integer
     IPv6 address and ARGS
 may be up to three integers:
 port
     [flowinfo] [scope_id],
 where flowinfo and scope_id default to
     zero.
 
 Alternatively, the second argument can be a socket
     address object as returned by `make-socket-address', in which case
     the no additional arguments should be passed.
 
 The return
     value is unspecified.
   
 listen

 -- Scheme Procedure: listen sock backlog
     Enable SOCK to accept connection
 requests.  BACKLOG is an
     integer specifying
 the maximum length of the queue for pending
     connections.
 If the queue fills, new clients will fail to
     connect until
 the server calls `accept' to accept a connection
     from
 the queue.
 
 The return value is unspecified.
   
 make-socket-address

 -- Scheme Procedure: make-socket-address family address . args
     Return a Scheme address object that reflects ADDRESS, being an
     address of family FAMILY, with the family-specific parameters ARGS
     (see the description of `connect' for details).
   
 accept

 -- Scheme Procedure: accept sock
     Accept a connection on a bound, listening socket.
 If there
 are
     no pending connections in the queue, wait until
 one is available
     unless the non-blocking option has been
 set on the socket.
 
     The return value is a
 pair in which the _car_ is a new socket
     port for the
 connection and
 the _cdr_ is an object with
     address information about the
 client which initiated the
     connection.
 
 SOCK does not become part of the
 connection and
     will continue to accept new requests.
   
 getsockname

 -- Scheme Procedure: getsockname sock
     Return the address of SOCK, in the same form as the
 object
     returned by `accept'.  On many systems the address
 of a socket
     in the `AF_FILE' namespace cannot be read.
   
 getpeername

 -- Scheme Procedure: getpeername sock
     Return the address that SOCK
 is connected to, in the same form
     as the object returned by
 `accept'.  On many systems the address
     of a socket in the
 `AF_FILE' namespace cannot be read.
   
 recv!

 -- Scheme Procedure: recv! sock buf [flags]
     Receive data from a socket port.
 SOCK must already
 be bound to
     the address from which data is to be received.
 BUF is a string
     into which
 the data will be written.  The size of BUF limits
     the amount of
 data which can be received: in the case of packet
     protocols, if a packet larger than this limit is encountered
     then some data
 will be irrevocably lost.
 
 The optional FLAGS
     argument is a value or
 bitwise OR of MSG_OOB, MSG_PEEK,
     MSG_DONTROUTE etc.
 
 The value returned is the number of bytes
     read from the
 socket.
 
 Note that the data is read directly
     from the socket file
 descriptor:
 any unread buffered port data
     is ignored.
   
 send

 -- Scheme Procedure: send sock message [flags]
     Transmit the string MESSAGE on a socket port SOCK.
 SOCK must
     already be bound to a destination address.  The
 value returned
     is the number of bytes transmitted -
 it's possible for
 this to
     be less than the length of MESSAGE
 if the socket is
 set to be
     non-blocking.  The optional FLAGS argument
 is a value or
     bitwise OR of MSG_OOB, MSG_PEEK, MSG_DONTROUTE etc.
 
 Note that
     the data is written directly to the socket
 file descriptor:
     any unflushed buffered port data is ignored.
   
 recvfrom!

 -- Scheme Procedure: recvfrom! sock str [flags [start [end]]]
     Receive data from socket port SOCK (which must be already
     bound), returning the originating address as well as the data.
     This is usually for use on datagram sockets, but can be used on
     stream-oriented sockets too.
 
 The data received is stored in
     the given STR, using
 either the whole string or just the region
     between the optional
 START and END positions.  The size of STR
     limits the amount of data which can be received.  For datagram
     protocols, if a packet larger than this is received then excess
     bytes are irrevocably lost.
 
 The return value is a pair.  The
     `car' is the number of
 bytes read.  The `cdr' is a socket
     address object which is
 where the data come from, or `#f' if the
     origin is
 unknown.
 
 The optional FLAGS argument is a or
     bitwise OR
 (`logior') of `MSG_OOB', `MSG_PEEK',
     `MSG_DONTROUTE' etc.
 
 Data is read directly from the socket
     file descriptor, any
 buffered port data is ignored.
 
 On a
     GNU/Linux system `recvfrom!' is not multi-threading,
 all threads
     stop while a `recvfrom!' call is in progress.
 An application may
     need to use `select', `O_NONBLOCK'
 or `MSG_DONTWAIT' to avoid
     this.
   
 sendto

 -- Scheme Procedure: sendto sock message fam_or_sockaddr [address .
          args_and_flags]
     Transmit the string MESSAGE on the socket port
 SOCK.  The
     destination address is specified using the FAM,
 ADDRESS and
     ARGS_AND_FLAGS arguments, or just a socket address object returned
     by `make-socket-address', in a similar way to the
 `connect'
     procedure.  ARGS_AND_FLAGS contains
 the usual connection
     arguments optionally followed by
 a flags argument, which is a
     value or
 bitwise OR of MSG_OOB, MSG_PEEK, MSG_DONTROUTE etc.
 
     The value returned is the number of bytes transmitted -
 it's
     possible for
 this to be less than the length of MESSAGE if the
     socket is
 set to be non-blocking.
 Note that the data is
     written directly to the socket
 file descriptor:
 any unflushed
     buffered port data is ignored.
   
 regexp?

 -- Scheme Procedure: regexp? obj
     Return `#t' if OBJ is a compiled regular expression,
 or `#f'
     otherwise.
   
 make-regexp

 -- Scheme Procedure: make-regexp pat . flags
     Compile the regular expression described by PAT, and
 return the
     compiled regexp structure.  If PAT does not
 describe a legal
     regular expression, `make-regexp' throws
 a
     `regular-expression-syntax' error.
 
 The FLAGS arguments change
     the behavior of the compiled
 regular expression.  The following
     flags may be supplied:
 
    `regexp/icase'
          Consider uppercase and lowercase letters to be the same when
          matching.

    `regexp/newline'
          If a newline appears in the target string, then permit the
          `^' and `$' operators to match immediately after or
          immediately before the newline, respectively.  Also, the
          `.' and `[^...]' operators will never match a newline
          character.  The intent of this flag is to treat the target
          string as a buffer containing many lines of text, and the
          regular expression as a pattern that may match a single one
          of
 those lines.

    `regexp/basic'
          Compile a basic ("obsolete") regexp instead of the extended
          ("modern") regexps that are the default.  Basic regexps do
          not consider `|', `+' or `?' to be special
 characters, and
          require the `{...}' and `(...)'
 metacharacters to be
          backslash-escaped (*note Backslash Escapes::).  There are
          several other differences between basic
 and extended
          regular expressions, but these are the most
 significant.

    `regexp/extended'
          Compile an extended regular expression rather than a basic
          regexp.  This is the default behavior; this flag will not
          usually be needed.  If a call to `make-regexp' includes
          both `regexp/basic' and `regexp/extended' flags, the
 one
          which comes last will override the earlier one.

 regexp-exec

 -- Scheme Procedure: regexp-exec rx str [start [flags]]
     Match the compiled regular expression RX against
 `str'.  If the
     optional integer START argument is
 provided, begin matching from
     that position in the string.
 Return a match structure describing
     the results of the match,
 or `#f' if no match could be found.
     
 The FLAGS arguments change the matching behavior.
 The
     following flags may be supplied:
 
    `regexp/notbol'
          Operator `^' always fails (unless `regexp/newline'
 is
          used).  Use this when the beginning of the string should
          not be considered the beginning of a line.

    `regexp/noteol'
          Operator `$' always fails (unless `regexp/newline'
 is
          used).  Use this when the end of the string should not be
          considered the end of a line.

