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// Copyright (c) 2010 Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "mac/crash_generation/crash_generation_client.h"
#include "mac/crash_generation/crash_generation_server.h"
#include "common/mac/MachIPC.h"
#include <pthread.h>
#include <servers/bootstrap.h>
namespace google_breakpad {
bool CrashGenerationClient::RequestDumpForException(
int exception_type,
int exception_code,
int64_t exception_subcode,
mach_port_t crashing_thread,
mach_port_t crashing_task) {
// This ensures that the client is fully initialized, we'll never leave this
// loop unless sender_ is a valid pointer we can access.
if (!WaitForInitialization()) {
return false;
}
// The server will send a message to this port indicating that it
// has finished its work.
ReceivePort acknowledge_port;
MachSendMessage message(kDumpRequestMessage);
message.AddDescriptor(crashing_task); // crashing task
message.AddDescriptor(crashing_thread); // crashing thread
message.AddDescriptor(MACH_PORT_NULL); // handler thread
message.AddDescriptor(acknowledge_port.GetPort()); // message receive port
ExceptionInfo info;
info.exception_type = exception_type;
info.exception_code = exception_code;
info.exception_subcode = exception_subcode;
info.child_pid = getpid();
message.SetData(&info, sizeof(info));
kern_return_t result = sender_->SendMessage(message, MACH_MSG_TIMEOUT_NONE);
if (result != KERN_SUCCESS)
return false;
// Give the server slightly longer to reply since it has to
// inspect this task and write the minidump.
MachReceiveMessage acknowledge_message;
result = acknowledge_port.WaitForMessage(&acknowledge_message,
MACH_MSG_TIMEOUT_NONE);
return result == KERN_SUCCESS;
}
// static
void* CrashGenerationClient::AsynchronousInitializationThread(void* arg) {
CrashGenerationClient* client = reinterpret_cast<CrashGenerationClient*>(arg);
client->Initialization();
return nullptr;
}
void CrashGenerationClient::Initialization() {
assert(state_ == State::Uninitialized);
mach_port_t task_bootstrap_port = 0;
kern_return_t rv = task_get_bootstrap_port(mach_task_self(),
&task_bootstrap_port);
if (rv != KERN_SUCCESS) {
os_unfair_lock_lock(&sync_);
state_ = State::Failed;
os_unfair_lock_unlock(&sync_);
return;
}
while (true) {
mach_port_t send_port;
rv = bootstrap_look_up(task_bootstrap_port, mach_port_name_.c_str(),
&send_port);
if (rv == KERN_SUCCESS) {
os_unfair_lock_lock(&sync_);
state_ = State::Initialized;
sender_ = std::make_unique<MachPortSender>(send_port);
os_unfair_lock_unlock(&sync_);
return;
} else if (rv == BOOTSTRAP_UNKNOWN_SERVICE) {
struct timespec delay = {
.tv_sec = 0,
.tv_nsec = 10 * 1000 * 1000, // 10ms
};
nanosleep(&delay, nullptr);
} else {
os_unfair_lock_lock(&sync_);
state_ = State::Failed;
os_unfair_lock_unlock(&sync_);
return;
}
}
}
void CrashGenerationClient::AsynchronousInitialization() {
pthread_t thread;
int rv = pthread_create(&thread, nullptr, AsynchronousInitializationThread, this);
if (rv < 0) {
state_ = State::Failed;
}
pthread_detach(thread);
}
bool CrashGenerationClient::WaitForInitialization() {
while (true) {
while (!os_unfair_lock_trylock(&sync_)) {
// We can't wait here as we may be in the exception handler, so spin
// instead until we get the lock.
}
State state = state_;
os_unfair_lock_unlock(&sync_);
switch (state) {
case Initializing:
continue;
case Initialized:
return true;
default:
return false;
}
}
}
} // namespace google_breakpad