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1 /*	$OpenBSD: abort.c,v 1.14 2005/08/08 08:05:36 espie Exp $ */
2 /*
3  * Copyright (c) 1985 Regents of the University of California.
4  * All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions and the following disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  *    notice, this list of conditions and the following disclaimer in the
13  *    documentation and/or other materials provided with the distribution.
14  * 3. Neither the name of the University nor the names of its contributors
15  *    may be used to endorse or promote products derived from this software
16  *    without specific prior written permission.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28  * SUCH DAMAGE.
29  */
30 
31 #include <signal.h>
32 #include <stdlib.h>
33 #include <unistd.h>
34 #include "thread_private.h"
35 #include "atexit.h"
36 
37 /* temporary, for bug hunting */
38 #include "logd.h"
39 #define debug_log(format, ...)  \
40     __libc_android_log_print(ANDROID_LOG_DEBUG, "libc-abort", (format), ##__VA_ARGS__ )
41 
42 void
abort(void)43 abort(void)
44 {
45 	struct atexit *p = __atexit;
46 	static int cleanup_called = 0;
47 	sigset_t mask;
48 
49 
50 	sigfillset(&mask);
51 	/*
52 	 * don't block SIGABRT to give any handler a chance; we ignore
53 	 * any errors -- X311J doesn't allow abort to return anyway.
54 	 */
55 	sigdelset(&mask, SIGABRT);
56     /* temporary, so deliberate seg fault can be caught by debuggerd */
57 	sigdelset(&mask, SIGSEGV);
58     /* -- */
59 	(void)sigprocmask(SIG_SETMASK, &mask, (sigset_t *)NULL);
60 
61 	/*
62 	 * POSIX requires we flush stdio buffers on abort
63 	 */
64 	if (cleanup_called == 0) {
65 		while (p != NULL && p->next != NULL)
66 			p = p->next;
67 		/* the check for fn_dso == NULL is mostly paranoia */
68 		if (p != NULL && p->fns[0].fn_dso == NULL &&
69 		    p->fns[0].fn_ptr.std_func != NULL) {
70 			cleanup_called = 1;
71 			(*p->fns[0].fn_ptr.std_func)();
72 		}
73 	}
74 
75     /* temporary, for bug hunting */
76     debug_log("abort() called in pid %d\n", getpid());
77     /* seg fault seems to produce better debuggerd results than SIGABRT */
78     *((char*)0xdeadbaad) = 39;
79     debug_log("somehow we're not dead?\n");
80     /* -- */
81 
82 	(void)kill(getpid(), SIGABRT);
83 
84 	/*
85 	 * if SIGABRT ignored, or caught and the handler returns, do
86 	 * it again, only harder.
87 	 */
88         {
89             struct sigaction sa;
90 
91             sa.sa_handler = SIG_DFL;
92             sa.sa_flags   = SA_RESTART;
93             sigemptyset(&sa.sa_mask);
94 
95             (void)sigaction( SIGABRT, &sa, &sa );
96         }
97 
98 	(void)sigprocmask(SIG_SETMASK, &mask, (sigset_t *)NULL);
99 	(void)kill(getpid(), SIGABRT);
100 	_exit(1);
101 }
102