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