1 /*
2 * Copyright (c) 1985 Regents of the University of California.
3 * 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 * 3. 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 #include <signal.h>
31 #include <stdlib.h>
32 #include <sys/syscall.h>
33 #include <unistd.h>
34
abort()35 void abort() {
36 // Protect ourselves against stale cached PID/TID values by fetching them via syscall.
37 // http://b/37769298
38 pid_t pid = syscall(__NR_getpid);
39 pid_t tid = syscall(__NR_gettid);
40
41 // Don't block SIGABRT to give any signal handler a chance; we ignore
42 // any errors -- X311J doesn't allow abort to return anyway.
43 sigset_t mask;
44 sigfillset(&mask);
45 sigdelset(&mask, SIGABRT);
46 sigprocmask(SIG_SETMASK, &mask, NULL);
47
48 // Use tgkill directly instead of raise, to avoid inserting spurious stack frames.
49 tgkill(pid, tid, SIGABRT);
50
51 // If SIGABRT ignored, or caught and the handler returns,
52 // remove the SIGABRT signal handler and raise SIGABRT again.
53 struct sigaction sa;
54 sa.sa_handler = SIG_DFL;
55 sa.sa_flags = SA_RESTART;
56 sigemptyset(&sa.sa_mask);
57 sigaction(SIGABRT, &sa, &sa);
58 sigprocmask(SIG_SETMASK, &mask, NULL);
59
60 tgkill(pid, tid, SIGABRT);
61
62 // If we get this far, just exit.
63 _exit(127);
64 }
65