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// Copyright 2017 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 "content/browser/child_process_launcher_helper.h"
#include "base/command_line.h"
#include "base/metrics/histogram_macros.h"
#include "content/browser/child_process_launcher.h"
#include "content/public/common/content_switches.h"
#include "content/public/common/sandboxed_process_launcher_delegate.h"
#include "mojo/edk/embedder/platform_channel_pair.h"
namespace content {
namespace internal {
namespace {
void RecordHistogramsOnLauncherThread(base::TimeDelta launch_time) {
DCHECK_CURRENTLY_ON(BrowserThread::PROCESS_LAUNCHER);
// Log the launch time, separating out the first one (which will likely be
// slower due to the rest of the browser initializing at the same time).
static bool done_first_launch = false;
if (done_first_launch) {
UMA_HISTOGRAM_TIMES("MPArch.ChildProcessLaunchSubsequent", launch_time);
} else {
UMA_HISTOGRAM_TIMES("MPArch.ChildProcessLaunchFirst", launch_time);
done_first_launch = true;
}
}
} // namespace
ChildProcessLauncherHelper::Process::Process(Process&& other)
: process(std::move(other.process))
#if defined(OS_LINUX)
, zygote(other.zygote)
#endif
{
}
ChildProcessLauncherHelper::Process&
ChildProcessLauncherHelper::Process::Process::operator=(
ChildProcessLauncherHelper::Process&& other) {
DCHECK_NE(this, &other);
process = std::move(other.process);
#if defined(OS_LINUX)
zygote = other.zygote;
#endif
return *this;
}
ChildProcessLauncherHelper::ChildProcessLauncherHelper(
int child_process_id,
BrowserThread::ID client_thread_id,
std::unique_ptr<base::CommandLine> command_line,
std::unique_ptr<SandboxedProcessLauncherDelegate> delegate,
const base::WeakPtr<ChildProcessLauncher>& child_process_launcher,
bool terminate_on_shutdown)
: child_process_id_(child_process_id),
client_thread_id_(client_thread_id),
command_line_(std::move(command_line)),
delegate_(std::move(delegate)),
child_process_launcher_(child_process_launcher),
terminate_on_shutdown_(terminate_on_shutdown) {
}
ChildProcessLauncherHelper::~ChildProcessLauncherHelper() {
}
void ChildProcessLauncherHelper::StartLaunchOnClientThread() {
DCHECK_CURRENTLY_ON(client_thread_id_);
BeforeLaunchOnClientThread();
mojo_server_handle_ = PrepareMojoPipeHandlesOnClientThread();
if (!mojo_server_handle_.is_valid()) {
mojo::edk::PlatformChannelPair channel_pair;
mojo_server_handle_ = channel_pair.PassServerHandle();
mojo_client_handle_ = channel_pair.PassClientHandle();
}
BrowserThread::PostTask(
BrowserThread::PROCESS_LAUNCHER, FROM_HERE,
base::Bind(&ChildProcessLauncherHelper::LaunchOnLauncherThread, this));
}
void ChildProcessLauncherHelper::LaunchOnLauncherThread() {
DCHECK_CURRENTLY_ON(BrowserThread::PROCESS_LAUNCHER);
begin_launch_time_ = base::TimeTicks::Now();
std::unique_ptr<FileMappedForLaunch> files_to_register = GetFilesToMap();
bool is_synchronous_launch = true;
int launch_result = LAUNCH_RESULT_FAILURE;
base::LaunchOptions options;
BeforeLaunchOnLauncherThread(*files_to_register, &options);
Process process = LaunchProcessOnLauncherThread(options,
std::move(files_to_register),
&is_synchronous_launch,
&launch_result);
AfterLaunchOnLauncherThread(process, options);
if (is_synchronous_launch) {
PostLaunchOnLauncherThread(std::move(process), launch_result);
}
}
void ChildProcessLauncherHelper::PostLaunchOnLauncherThread(
ChildProcessLauncherHelper::Process process,
int launch_result) {
// Release the client handle now that the process has been started (the pipe
// may not signal when the process dies otherwise and we would not detect the
// child process died).
mojo_client_handle_.reset();
if (process.process.IsValid()) {
RecordHistogramsOnLauncherThread(base::TimeTicks::Now() -
begin_launch_time_);
}
BrowserThread::PostTask(
client_thread_id_, FROM_HERE,
base::Bind(&ChildProcessLauncherHelper::PostLaunchOnClientThread, this,
base::Passed(&process), launch_result));
}
void ChildProcessLauncherHelper::PostLaunchOnClientThread(
ChildProcessLauncherHelper::Process process,
int error_code) {
if (child_process_launcher_) {
child_process_launcher_->Notify(
std::move(process), std::move(mojo_server_handle_), error_code);
} else if (process.process.IsValid() && terminate_on_shutdown_) {
// Client is gone, terminate the process.
ForceNormalProcessTerminationAsync(std::move(process));
}
}
std::string ChildProcessLauncherHelper::GetProcessType() {
return command_line()->GetSwitchValueASCII(switches::kProcessType);
}
// static
void ChildProcessLauncherHelper::ForceNormalProcessTerminationAsync(
ChildProcessLauncherHelper::Process process) {
if (BrowserThread::CurrentlyOn(BrowserThread::PROCESS_LAUNCHER)) {
ForceNormalProcessTerminationSync(std::move(process));
return;
}
// On Posix, EnsureProcessTerminated can lead to 2 seconds of sleep!
// So don't do this on the UI/IO threads.
BrowserThread::PostTask(
BrowserThread::PROCESS_LAUNCHER, FROM_HERE,
base::Bind(&ChildProcessLauncherHelper::ForceNormalProcessTerminationSync,
base::Passed(&process)));
}
} // namespace internal
} // namespace content
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