xref: /freebsd/lib/libc/stdlib/abort.c (revision 13014ca04aad1931d41958b56f71a2c65b9a7a2c)
1 /*
2  * Copyright (c) 1985, 1993
3  *	The Regents of the University of California.  All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  * 4. Neither the name of the University nor the names of its contributors
14  *    may be used to endorse or promote products derived from this software
15  *    without specific prior written permission.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27  * SUCH DAMAGE.
28  */
29 
30 #if defined(LIBC_SCCS) && !defined(lint)
31 static char sccsid[] = "@(#)abort.c	8.1 (Berkeley) 6/4/93";
32 #endif /* LIBC_SCCS and not lint */
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
35 
36 #include "namespace.h"
37 #include <signal.h>
38 #include <stdlib.h>
39 #include <stddef.h>
40 #include <unistd.h>
41 #include <pthread.h>
42 #include "un-namespace.h"
43 
44 #include "libc_private.h"
45 
46 void
47 abort()
48 {
49 	struct sigaction act;
50 
51 	/*
52 	 * POSIX requires we flush stdio buffers on abort.
53 	 * XXX ISO C requires that abort() be async-signal-safe.
54 	 */
55 	if (__cleanup)
56 		(*__cleanup)();
57 
58 	sigfillset(&act.sa_mask);
59 	/*
60 	 * Don't block SIGABRT to give any handler a chance; we ignore
61 	 * any errors -- ISO C doesn't allow abort to return anyway.
62 	 */
63 	sigdelset(&act.sa_mask, SIGABRT);
64 	(void)_sigprocmask(SIG_SETMASK, &act.sa_mask, NULL);
65 	(void)raise(SIGABRT);
66 
67 	/*
68 	 * If SIGABRT was ignored, or caught and the handler returns, do
69 	 * it again, only harder.
70 	 */
71 	act.sa_handler = SIG_DFL;
72 	act.sa_flags = 0;
73 	sigfillset(&act.sa_mask);
74 	(void)_sigaction(SIGABRT, &act, NULL);
75 	sigdelset(&act.sa_mask, SIGABRT);
76 	(void)_sigprocmask(SIG_SETMASK, &act.sa_mask, NULL);
77 	(void)raise(SIGABRT);
78 	exit(1);
79 }
80