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)
31static 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: src/lib/libc/stdlib/abort.c,v 1.11 2007/01/09 00:28:09 imp Exp $");
35
36#include "namespace.h"
37#include <signal.h>
38#include <stdarg.h>
39#include <stdlib.h>
40#include <stddef.h>
41#include <unistd.h>
42#include <pthread.h>
43#include <pthread_workqueue.h>
44#include "un-namespace.h"
45
46#include "libc_private.h"
47
48#include <CrashReporterClient.h>
49#include "_simple.h"
50
51extern void (*__cleanup)();
52extern void __abort(void) __dead2;
53
54#define TIMEOUT	10000	/* 10 milliseconds */
55
56void
57abort()
58{
59	struct sigaction act;
60
61	if (!CRGetCrashLogMessage())
62		CRSetCrashLogMessage("abort() called");
63
64	/*
65	 * POSIX requires we flush stdio buffers on abort.
66	 * XXX ISO C requires that abort() be async-signal-safe.
67	 */
68	if (__cleanup)
69		(*__cleanup)();
70
71	sigfillset(&act.sa_mask);
72	/*
73	 * Don't block SIGABRT to give any handler a chance; we ignore
74	 * any errors -- ISO C doesn't allow abort to return anyway.
75	 */
76	sigdelset(&act.sa_mask, SIGABRT);
77
78	/* <rdar://problem/7397932> abort() should call pthread_kill to deliver a signal to the aborting thread
79	 * This helps gdb focus on the thread calling abort()
80	 */
81
82	/* Block all signals on all other threads */
83	sigset_t fullmask;
84	sigfillset(&fullmask);
85	(void)_sigprocmask(SIG_SETMASK, &fullmask, NULL);
86
87	/* <rdar://problem/8400096> Set the workqueue killable */
88	__pthread_workqueue_setkill(1);
89
90	(void)pthread_sigmask(SIG_SETMASK, &act.sa_mask, NULL);
91	(void)pthread_kill(pthread_self(), SIGABRT);
92
93	usleep(TIMEOUT); /* give time for signal to happen */
94
95	/*
96	 * If SIGABRT was ignored, or caught and the handler returns, do
97	 * it again, only harder.
98	 */
99	 __abort();
100}
101
102__private_extern__ void
103__abort()
104{
105	struct sigaction act;
106
107	if (!CRGetCrashLogMessage())
108		CRSetCrashLogMessage("__abort() called");
109	act.sa_handler = SIG_DFL;
110	act.sa_flags = 0;
111	sigfillset(&act.sa_mask);
112	(void)_sigaction(SIGABRT, &act, NULL);
113	sigdelset(&act.sa_mask, SIGABRT);
114
115	/* <rdar://problem/7397932> abort() should call pthread_kill to deliver a signal to the aborting thread
116	 * This helps gdb focus on the thread calling abort()
117	 */
118
119	/* Block all signals on all other threads */
120	sigset_t fullmask;
121	sigfillset(&fullmask);
122	(void)_sigprocmask(SIG_SETMASK, &fullmask, NULL);
123
124	/* <rdar://problem/8400096> Set the workqueue killable */
125	__pthread_workqueue_setkill(1);
126
127	(void)pthread_sigmask(SIG_SETMASK, &act.sa_mask, NULL);
128	(void)pthread_kill(pthread_self(), SIGABRT);
129
130	usleep(TIMEOUT); /* give time for signal to happen */
131
132	/* If for some reason SIGABRT was not delivered, we exit using __builtin_trap
133	 * which generates an illegal instruction on i386: <rdar://problem/8400958>
134	 * and SIGTRAP on arm.
135	 */
136	sigfillset(&act.sa_mask);
137	sigdelset(&act.sa_mask, SIGILL);
138	sigdelset(&act.sa_mask, SIGTRAP);
139	(void)_sigprocmask(SIG_SETMASK, &act.sa_mask, NULL);
140	__builtin_trap();
141}
142
143__private_extern__ void
144abort_report_np(const char *fmt, ...)
145{
146	_SIMPLE_STRING s;
147	va_list ap;
148
149	if ((s = _simple_salloc()) != NULL) {
150		va_start(ap, fmt);
151		_simple_vsprintf(s, fmt, ap);
152		va_end(ap);
153		CRSetCrashLogMessage(_simple_string(s));
154	} else
155		CRSetCrashLogMessage(fmt); /* the format string is better than nothing */
156	abort();
157}
158