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// 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
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