1/*	$NetBSD: abort.c,v 1.14 2011/05/18 19:36:36 dsl Exp $	*/
2
3/*
4 * Copyright (c) 1985, 1993
5 *	The Regents of the University of California.  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. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33#if defined(LIBC_SCCS) && !defined(lint)
34#if 0
35static char sccsid[] = "@(#)abort.c	8.1 (Berkeley) 6/4/93";
36#else
37__RCSID("$NetBSD: abort.c,v 1.14 2011/05/18 19:36:36 dsl Exp $");
38#endif
39#endif /* LIBC_SCCS and not lint */
40
41#include "namespace.h"
42#include <signal.h>
43#include <stdlib.h>
44#include <unistd.h>
45
46extern void (*__cleanup)(void);
47static int aborting = 0;
48
49void
50abort(void)
51{
52	sigset_t mask;
53
54	sigfillset(&mask);
55	/*
56	 * don't block SIGABRT to give any handler a chance; we ignore
57	 * any errors -- X311J doesn't allow abort to return anyway.
58	 */
59	sigdelset(&mask, SIGABRT);
60	(void)sigprocmask(SIG_SETMASK, &mask, (sigset_t *)NULL);
61
62	/*
63	 * POSIX.1 requires that stdio buffers be flushed on abort.
64	 * We ensure the cleanup routines are only called once in
65	 * case the user calls abort() in a SIGABRT handler.
66	 */
67	if (!aborting) {
68		aborting = 1;
69
70		if (__cleanup)
71			(*__cleanup)();
72	}
73
74	(void)raise(SIGABRT);
75
76	/*
77	 * if SIGABRT ignored, or caught and the handler returns, do
78	 * it again, only harder.
79	 */
80	(void)signal(SIGABRT, SIG_DFL);
81	(void)sigprocmask(SIG_SETMASK, &mask, (sigset_t *)NULL);
82	(void)raise(SIGABRT);
83	_exit(1);
84}
85