abort.c revision 1.7 
1/*	$NetBSD: abort.c,v 1.7 1996/10/24 20:45:55 jtc Exp $	*/
2
3/*
4 * Copyright (c) 1985 Regents of the University of California.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 *    must display the following acknowledgement:
17 *	This product includes software developed by the University of
18 *	California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36#if defined(LIBC_SCCS) && !defined(lint)
37#if 0
38static char *sccsid = "from: @(#)abort.c	5.11 (Berkeley) 2/23/91";
39#else
40static char *rcsid = "$NetBSD: abort.c,v 1.7 1996/10/24 20:45:55 jtc Exp $";
41#endif
42#endif /* LIBC_SCCS and not lint */
43
44#include <signal.h>
45#include <stdlib.h>
46#include <unistd.h>
47
48void (*__cleanup)();
49static int aborting = 0;
50
51void
52abort()
53{
54	sigset_t mask;
55
56	sigfillset(&mask);
57	/*
58	 * don't block SIGABRT to give any handler a chance; we ignore
59	 * any errors -- X311J doesn't allow abort to return anyway.
60	 */
61	sigdelset(&mask, SIGABRT);
62	(void)sigprocmask(SIG_SETMASK, &mask, (sigset_t *)NULL);
63
64	/*
65	 * POSIX.1 requires that stdio buffers be flushed on abort.
66	 * We ensure the cleanup routines are only called once in
67	 * case the user calls abort() in a SIGABRT handler.
68	 *
69	 * XXX Other libc's do atexit processing on abort.  Is this
70	 * something we should be doing too?
71	 */
72	if (!aborting) {
73		aborting = 1;
74
75		if (__cleanup)
76			(*__cleanup)();
77	}
78
79	(void)kill(getpid(), SIGABRT);
80
81	/*
82	 * if SIGABRT ignored, or caught and the handler returns, do
83	 * it again, only harder.
84	 */
85	(void)signal(SIGABRT, SIG_DFL);
86	(void)sigprocmask(SIG_SETMASK, &mask, (sigset_t *)NULL);
87	(void)kill(getpid(), SIGABRT);
88	exit(1);
89}
90