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 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
