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// Copyright (c) 2012 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/process/launch.h"
#include <mach/mach.h>
#include <servers/bootstrap.h>
#include "base/logging.h"
namespace base {
void RestoreDefaultExceptionHandler() {
// This function is tailored to remove the Breakpad exception handler.
// exception_mask matches s_exception_mask in
// breakpad/src/client/mac/handler/exception_handler.cc
const exception_mask_t exception_mask = EXC_MASK_BAD_ACCESS |
EXC_MASK_BAD_INSTRUCTION |
EXC_MASK_ARITHMETIC |
EXC_MASK_BREAKPOINT;
// Setting the exception port to MACH_PORT_NULL may not be entirely
// kosher to restore the default exception handler, but in practice,
// it results in the exception port being set to Apple Crash Reporter,
// the desired behavior.
task_set_exception_ports(mach_task_self(), exception_mask, MACH_PORT_NULL,
EXCEPTION_DEFAULT, THREAD_STATE_NONE);
}
void ReplaceBootstrapPort(const std::string& new_bootstrap_name) {
// This function is called between fork() and exec(), so it should take care
// to run properly in that situation.
mach_port_t port = MACH_PORT_NULL;
kern_return_t kr = bootstrap_look_up(bootstrap_port,
new_bootstrap_name.c_str(), &port);
if (kr != KERN_SUCCESS) {
RAW_LOG(FATAL, "Failed to look up replacement bootstrap port.");
}
kr = task_set_bootstrap_port(mach_task_self(), port);
if (kr != KERN_SUCCESS) {
RAW_LOG(FATAL, "Failed to replace bootstrap port.");
}
// On OS X 10.10 and higher, libxpc uses the port stash to transfer the
// XPC root port. This is effectively the same connection as the Mach
// bootstrap port, but not transferred using the task special port.
// Therefore, stash the replacement bootstrap port, so that on 10.10 it
// will be retrieved by the XPC code and used as a replacement for the
// XPC root port as well.
kr = mach_ports_register(mach_task_self(), &port, 1);
if (kr != KERN_SUCCESS) {
RAW_LOG(ERROR, "Failed to register replacement bootstrap port.");
}
}
} // namespace base
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