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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/app/exit_code_watcher_win.h"
#include <windows.h>
#include <utility>
#include "base/check.h"
#include "base/functional/bind.h"
#include "base/message_loop/message_pump_type.h"
#include "base/metrics/histogram_base.h"
#include "base/metrics/sparse_histogram.h"
#include "base/process/process.h"
#include "base/process/process_handle.h"
#include "base/task/sequenced_task_runner.h"
#include "base/threading/thread.h"
#include "base/win/scoped_handle.h"
namespace {
constexpr char kBrowserExitCodeHistogramName[] = "Stability.BrowserExitCodes";
bool WriteProcessExitCode(int exit_code) {
if (exit_code != STILL_ACTIVE) {
// Record the exit codes in a sparse stability histogram, as the range of
// values used to report failures is large.
base::HistogramBase* exit_code_histogram =
base::SparseHistogram::FactoryGet(
kBrowserExitCodeHistogramName,
base::HistogramBase::kUmaStabilityHistogramFlag);
exit_code_histogram->Add(exit_code);
return true;
}
return false;
}
} // namespace
ExitCodeWatcher::ExitCodeWatcher()
: background_thread_("ExitCodeWatcherThread"),
exit_code_(STILL_ACTIVE),
stop_watching_handle_(::CreateEvent(nullptr, TRUE, FALSE, nullptr)) {
DCHECK(stop_watching_handle_.IsValid());
}
ExitCodeWatcher::~ExitCodeWatcher() = default;
bool ExitCodeWatcher::Initialize(base::Process process) {
if (!process.IsValid()) {
return false;
}
DWORD process_pid = process.Pid();
if (process_pid == 0) {
return false;
}
FILETIME creation_time = {};
FILETIME dummy = {};
if (!::GetProcessTimes(process.Handle(), &creation_time, &dummy, &dummy,
&dummy)) {
return false;
}
// Success, take ownership of the process.
process_ = std::move(process);
return true;
}
bool ExitCodeWatcher::StartWatching() {
if (!background_thread_.StartWithOptions(
base::Thread::Options(base::MessagePumpType::IO, 0))) {
return false;
}
// Unretained is safe because `this` owns the thread.
if (!background_thread_.task_runner()->PostTask(
FROM_HERE, base::BindOnce(&ExitCodeWatcher::WaitForExit,
base::Unretained(this)))) {
background_thread_.Stop();
return false;
}
return true;
}
void ExitCodeWatcher::StopWatching() {
if (stop_watching_handle_.IsValid()) {
::SetEvent(stop_watching_handle_.Get());
}
}
void ExitCodeWatcher::WaitForExit() {
base::Process::WaitExitStatus wait_result =
process_.WaitForExitOrEvent(stop_watching_handle_, &exit_code_);
if (wait_result == base::Process::WaitExitStatus::PROCESS_EXITED) {
WriteProcessExitCode(exit_code_);
}
}
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