1 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "base/mac/os_crash_dumps.h"
6
7 #include <signal.h>
8 #include <unistd.h>
9
10 #include "base/basictypes.h"
11 #include "base/logging.h"
12
13 namespace base {
14 namespace mac {
15
16 namespace {
17
ExitSignalHandler(int sig)18 void ExitSignalHandler(int sig) {
19 // A call to exit() can call atexit() handlers. If we SIGSEGV due
20 // to a corrupt heap, and if we have an atexit handler that
21 // allocates or frees memory, we are in trouble if we do not _exit.
22 _exit(128 + sig);
23 }
24
25 } // namespace
26
DisableOSCrashDumps()27 void DisableOSCrashDumps() {
28 // These are the POSIX signals corresponding to the Mach exceptions that
29 // Apple Crash Reporter handles. See ux_exception() in xnu's
30 // bsd/uxkern/ux_exception.c and machine_exception() in xnu's
31 // bsd/dev/*/unix_signal.c.
32 const int signals_to_intercept[] = {
33 SIGILL, // EXC_BAD_INSTRUCTION
34 SIGTRAP, // EXC_BREAKPOINT
35 SIGFPE, // EXC_ARITHMETIC
36 SIGBUS, // EXC_BAD_ACCESS
37 SIGSEGV // EXC_BAD_ACCESS
38 };
39
40 // For all these signals, just wire things up so we exit immediately.
41 for (size_t i = 0; i < arraysize(signals_to_intercept); ++i) {
42 struct sigaction act = {};
43 act.sa_handler = ExitSignalHandler;
44
45 // It is better to allow the signal handler to run on the stack
46 // registered with sigaltstack(), if one is present.
47 act.sa_flags = SA_ONSTACK;
48
49 if (sigemptyset(&act.sa_mask) != 0)
50 DLOG_ERRNO(FATAL) << "sigemptyset() failed";
51 if (sigaction(signals_to_intercept[i], &act, NULL) != 0)
52 DLOG_ERRNO(FATAL) << "sigaction() failed";
53 }
54 }
55
56 } // namespace mac
57 } // namespace base
58