[gcc.git] / libiberty / xatexit.c

/*
 * Copyright (c) 1990 Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 */

/* Adapted from newlib/libc/stdlib/{,at}exit.[ch].
   If you use xatexit, you must call xexit instead of exit.  */

#include "ansidecl.h"
#include "libiberty.h"

#include <stdio.h>

#ifdef __STDC__
#include <stddef.h>
#else
#define size_t unsigned long
#endif

/* For systems with larger pointers than ints, this must be declared.  */
PTR malloc PARAMS ((size_t));

static void xatexit_cleanup PARAMS ((void));

/* Pointer to function run by xexit.  */
extern void (*_xexit_cleanup) PARAMS ((void));

#define	XATEXIT_SIZE 32

struct xatexit {
	struct	xatexit *next;		/* next in list */
	int	ind;			/* next index in this table */
	void	(*fns[XATEXIT_SIZE]) PARAMS ((void));	/* the table itself */
};

/* Allocate one struct statically to guarantee that we can register
   at least a few handlers.  */
static struct xatexit xatexit_first;

/* Points to head of LIFO stack.  */
static struct xatexit *xatexit_head = &xatexit_first;

/* Register function FN to be run by xexit.
   Return 0 if successful, -1 if not.  */

int
xatexit (fn)
     void (*fn) PARAMS ((void));
{
  register struct xatexit *p;

  /* Tell xexit to call xatexit_cleanup.  */
  if (!_xexit_cleanup)
    _xexit_cleanup = xatexit_cleanup;

  p = xatexit_head;
  if (p->ind >= XATEXIT_SIZE)
    {
      if ((p = (struct xatexit *) malloc (sizeof *p)) == NULL)
	return -1;
      p->ind = 0;
      p->next = xatexit_head;
      xatexit_head = p;
    }
  p->fns[p->ind++] = fn;
  return 0;
}

/* Call any cleanup functions.  */

static void
xatexit_cleanup ()
{
  register struct xatexit *p;
  register int n;

  for (p = xatexit_head; p; p = p->next)
    for (n = p->ind; --n >= 0;)
      (*p->fns[n]) ();
}
Commit	Line	Data
6599da04 JM	1	/*
	2	* Copyright (c) 1990 Regents of the University of California.
	3	* All rights reserved.
	4	*
	5	* %sccs.include.redist.c%
	6	*/
	7
	8	/* Adapted from newlib/libc/stdlib/{,at}exit.[ch].
	9	If you use xatexit, you must call xexit instead of exit. */
	10
	11	#include "ansidecl.h"
	12	#include "libiberty.h"
	13
	14	#include <stdio.h>
	15
	16	#ifdef __STDC__
	17	#include <stddef.h>
	18	#else
	19	#define size_t unsigned long
	20	#endif
	21
	22	/* For systems with larger pointers than ints, this must be declared. */
	23	PTR malloc PARAMS ((size_t));
	24
	25	static void xatexit_cleanup PARAMS ((void));
	26
	27	/* Pointer to function run by xexit. */
	28	extern void (*_xexit_cleanup) PARAMS ((void));
	29
	30	#define XATEXIT_SIZE 32
	31
	32	struct xatexit {
	33	struct xatexit next; / next in list */
	34	int ind; /* next index in this table */
	35	void (fns[XATEXIT_SIZE]) PARAMS ((void)); / the table itself */
	36	};
	37
	38	/* Allocate one struct statically to guarantee that we can register
	39	at least a few handlers. */
	40	static struct xatexit xatexit_first;
	41
	42	/* Points to head of LIFO stack. */
	43	static struct xatexit *xatexit_head = &xatexit_first;
	44
	45	/* Register function FN to be run by xexit.
	46	Return 0 if successful, -1 if not. */
	47
	48	int
	49	xatexit (fn)
	50	void (*fn) PARAMS ((void));
	51	{
	52	register struct xatexit *p;
	53
	54	/* Tell xexit to call xatexit_cleanup. */
	55	if (!_xexit_cleanup)
	56	_xexit_cleanup = xatexit_cleanup;
	57
	58	p = xatexit_head;
	59	if (p->ind >= XATEXIT_SIZE)
	60	{
	61	if ((p = (struct xatexit ) malloc (sizeof p)) == NULL)
	62	return -1;
	63	p->ind = 0;
	64	p->next = xatexit_head;
65	xatexit_head = p;
66	}
67	p->fns[p->ind++] = fn;
68	return 0;
69	}
70
71	/* Call any cleanup functions. */
72
73	static void
74	xatexit_cleanup ()
75	{
76	register struct xatexit *p;
77	register int n;
78
79	for (p = xatexit_head; p; p = p->next)
80	for (n = p->ind; --n >= 0;)
81	(*p->fns[n]) ();
82	}