base/mac/os_crash_dumps.cc

   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
  12 namespace base {
  13 namespace mac {
  14
  15 namespace {
  16
  17 void ExitSignalHandler(int sig) {
  18   // A call to exit() can call atexit() handlers.  If we SIGSEGV due
  19   // to a corrupt heap, and if we have an atexit handler that
  20   // allocates or frees memory, we are in trouble if we do not _exit.
  21   _exit(128 + sig);
  22 }
  23
  24 }  // namespace
  25
  26 void DisableOSCrashDumps() {
  27   // These are the POSIX signals corresponding to the Mach exceptions that
  28   // Apple Crash Reporter handles.  See ux_exception() in xnu's
  29   // bsd/uxkern/ux_exception.c and machine_exception() in xnu's
  30   // bsd/dev/*/unix_signal.c.
  31   const int signals_to_intercept[] = {
  32     SIGILL,   // EXC_BAD_INSTRUCTION
  33     SIGTRAP,  // EXC_BREAKPOINT
  34     SIGFPE,   // EXC_ARITHMETIC
  35     SIGBUS,   // EXC_BAD_ACCESS
  36     SIGSEGV   // EXC_BAD_ACCESS
  37   };
  38
  39   // For all these signals, just wire things up so we exit immediately.
  40   for (size_t i = 0; i < arraysize(signals_to_intercept); ++i)
  41     signal(signals_to_intercept[i], ExitSignalHandler);
  42 }
  43
  44 }  // namespace mac
  45 }  // namespace base