100 lines
2.1 KiB
C
100 lines
2.1 KiB
C
/*
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* Copyright (c) 1990 Regents of the University of California.
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* All rights reserved.
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*
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* %sccs.include.redist.c%
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*/
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/*
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@deftypefun int xatexit (void (*@var{fn}) (void))
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Behaves as the standard @code{atexit} function, but with no limit on
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the number of registered functions. Returns 0 on success, or @minus{}1 on
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failure. If you use @code{xatexit} to register functions, you must use
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@code{xexit} to terminate your program.
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@end deftypefun
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*/
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/* Adapted from newlib/libc/stdlib/{,at}exit.[ch].
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If you use xatexit, you must call xexit instead of exit. */
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "ansidecl.h"
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#include "libiberty.h"
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#include <stdio.h>
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#include <stddef.h>
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#if VMS
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#include <stdlib.h>
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#include <unixlib.h>
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#else
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/* For systems with larger pointers than ints, this must be declared. */
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PTR malloc (size_t);
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#endif
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static void xatexit_cleanup (void);
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/* Pointer to function run by xexit. */
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extern void (*_xexit_cleanup) (void);
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#define XATEXIT_SIZE 32
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struct xatexit {
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struct xatexit *next; /* next in list */
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int ind; /* next index in this table */
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void (*fns[XATEXIT_SIZE]) (void); /* the table itself */
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};
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/* Allocate one struct statically to guarantee that we can register
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at least a few handlers. */
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static struct xatexit xatexit_first;
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/* Points to head of LIFO stack. */
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static struct xatexit *xatexit_head = &xatexit_first;
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/* Register function FN to be run by xexit.
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Return 0 if successful, -1 if not. */
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int
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xatexit (void (*fn) (void))
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{
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register struct xatexit *p;
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/* Tell xexit to call xatexit_cleanup. */
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if (!_xexit_cleanup)
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_xexit_cleanup = xatexit_cleanup;
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p = xatexit_head;
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if (p->ind >= XATEXIT_SIZE)
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{
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if ((p = (struct xatexit *) malloc (sizeof *p)) == NULL)
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return -1;
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p->ind = 0;
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p->next = xatexit_head;
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xatexit_head = p;
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}
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p->fns[p->ind++] = fn;
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return 0;
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}
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/* Call any cleanup functions. */
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static void
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xatexit_cleanup (void)
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{
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register struct xatexit *p;
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register int n;
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for (p = xatexit_head; p; p = p->next)
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for (n = p->ind; --n >= 0;)
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(*p->fns[n]) ();
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}
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