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atexit.c revision 1.6 
      1 /*	$NetBSD: atexit.c,v 1.6 1995/12/28 08:52:02 thorpej Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1990 The Regents of the University of California.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to Berkeley by
      8  * Chris Torek.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the University of
     21  *	California, Berkeley and its contributors.
     22  * 4. Neither the name of the University nor the names of its contributors
     23  *    may be used to endorse or promote products derived from this software
     24  *    without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     36  * SUCH DAMAGE.
     37  */
     38 
     39 #if defined(LIBC_SCCS) && !defined(lint)
     40 #if 0
     41 static char *sccsid = "from: @(#)atexit.c	5.2 (Berkeley) 11/14/90";
     42 #else
     43 static char *rcsid = "$NetBSD: atexit.c,v 1.6 1995/12/28 08:52:02 thorpej Exp $";
     44 #endif
     45 #endif /* LIBC_SCCS and not lint */
     46 
     47 #include <stdlib.h>
     48 #include "atexit.h"
     49 
     50 struct atexit *__atexit;
     51 
     52 /*
     53  * Register a function to be performed at exit.
     54  */
     55 int
     56 atexit(fn)
     57 	void (*fn)();
     58 {
     59 	static struct atexit __atexit0;	/* one guaranteed table */
     60 	register struct atexit *p;
     61 
     62 	if ((p = __atexit) == NULL)
     63 		__atexit = p = &__atexit0;
     64 	else if (p->ind >= ATEXIT_SIZE) {
     65 		if ((p = malloc(sizeof(*p))) == NULL)
     66 			return (-1);
     67 		p->ind = 0;
     68 		p->next = __atexit;
     69 		__atexit = p;
     70 	}
     71 	p->fns[p->ind++] = fn;
     72 	return (0);
     73 }
     74