// Copyright (c) 2010 The Chromium Authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. #include "base/mac/os_crash_dumps.h" #include <signal.h> #include <unistd.h> #include "base/basictypes.h" #include "base/logging.h" namespace base { namespace mac { namespace { void ExitSignalHandler(int sig) { // A call to exit() can call atexit() handlers. If we SIGSEGV due // to a corrupt heap, and if we have an atexit handler that // allocates or frees memory, we are in trouble if we do not _exit. _exit(128 + sig); } } // namespace void DisableOSCrashDumps() { // These are the POSIX signals corresponding to the Mach exceptions that // Apple Crash Reporter handles. See ux_exception() in xnu's // bsd/uxkern/ux_exception.c and machine_exception() in xnu's // bsd/dev/*/unix_signal.c. const int signals_to_intercept[] = { // Hardware faults SIGILL, // EXC_BAD_INSTRUCTION SIGTRAP, // EXC_BREAKPOINT SIGFPE, // EXC_ARITHMETIC SIGBUS, // EXC_BAD_ACCESS SIGSEGV, // EXC_BAD_ACCESS // Not a hardware fault SIGABRT }; // For all these signals, just wire things up so we exit immediately. for (size_t i = 0; i < arraysize(signals_to_intercept); ++i) { struct sigaction act = {}; act.sa_handler = ExitSignalHandler; // It is better to allow the signal handler to run on the stack // registered with sigaltstack(), if one is present. act.sa_flags = SA_ONSTACK; if (sigemptyset(&act.sa_mask) != 0) DPLOG(FATAL) << "sigemptyset() failed"; if (sigaction(signals_to_intercept[i], &act, NULL) != 0) DPLOG(FATAL) << "sigaction() failed"; } } } // namespace mac } // namespace base