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| 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 | |
| 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 | |
| 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 // Hardware faults | |
| 34 SIGILL, // EXC_BAD_INSTRUCTION | |
| 35 SIGTRAP, // EXC_BREAKPOINT | |
| 36 SIGFPE, // EXC_ARITHMETIC | |
| 37 SIGBUS, // EXC_BAD_ACCESS | |
| 38 SIGSEGV, // EXC_BAD_ACCESS | |
| 39 // Not a hardware fault | |
| 40 SIGABRT | |
| 41 }; | |
| 42 | |
| 43 // For all these signals, just wire things up so we exit immediately. | |
| 44 for (size_t i = 0; i < arraysize(signals_to_intercept); ++i) { | |
| 45 struct sigaction act = {}; | |
| 46 act.sa_handler = ExitSignalHandler; | |
| 47 | |
| 48 // It is better to allow the signal handler to run on the stack | |
| 49 // registered with sigaltstack(), if one is present. | |
| 50 act.sa_flags = SA_ONSTACK; | |
| 51 | |
| 52 if (sigemptyset(&act.sa_mask) != 0) | |
| 53 DPLOG(FATAL) << "sigemptyset() failed"; | |
| 54 if (sigaction(signals_to_intercept[i], &act, NULL) != 0) | |
| 55 DPLOG(FATAL) << "sigaction() failed"; | |
| 56 } | |
| 57 } | |
| 58 | |
| 59 } // namespace mac | |
| 60 } // namespace base | |
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