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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 "content/browser/browser_child_process_host_impl.h"
#include "base/base_switches.h"
#include "base/bind.h"
#include "base/command_line.h"
#include "base/files/file_path.h"
#include "base/lazy_instance.h"
#include "base/logging.h"
#include "base/metrics/histogram.h"
#include "base/path_service.h"
#include "base/stl_util.h"
#include "base/strings/string_util.h"
#include "base/synchronization/waitable_event.h"
#include "content/browser/histogram_message_filter.h"
#include "content/browser/loader/resource_message_filter.h"
#include "content/browser/profiler_message_filter.h"
#include "content/browser/tracing/trace_message_filter.h"
#include "content/common/child_process_host_impl.h"
#include "content/public/browser/browser_child_process_host_delegate.h"
#include "content/public/browser/browser_child_process_observer.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/child_process_data.h"
#include "content/public/browser/content_browser_client.h"
#include "content/public/common/content_switches.h"
#include "content/public/common/process_type.h"
#include "content/public/common/result_codes.h"
#if defined(OS_MACOSX)
#include "content/browser/mach_broker_mac.h"
#endif
namespace content {
namespace {
static base::LazyInstance<BrowserChildProcessHostImpl::BrowserChildProcessList>
g_child_process_list = LAZY_INSTANCE_INITIALIZER;
base::LazyInstance<ObserverList<BrowserChildProcessObserver> >
g_observers = LAZY_INSTANCE_INITIALIZER;
void NotifyProcessHostConnected(const ChildProcessData& data) {
FOR_EACH_OBSERVER(BrowserChildProcessObserver, g_observers.Get(),
BrowserChildProcessHostConnected(data));
}
void NotifyProcessHostDisconnected(const ChildProcessData& data) {
FOR_EACH_OBSERVER(BrowserChildProcessObserver, g_observers.Get(),
BrowserChildProcessHostDisconnected(data));
}
void NotifyProcessCrashed(const ChildProcessData& data) {
FOR_EACH_OBSERVER(BrowserChildProcessObserver, g_observers.Get(),
BrowserChildProcessCrashed(data));
}
} // namespace
BrowserChildProcessHost* BrowserChildProcessHost::Create(
int process_type,
BrowserChildProcessHostDelegate* delegate) {
return new BrowserChildProcessHostImpl(process_type, delegate);
}
#if defined(OS_MACOSX)
base::ProcessMetrics::PortProvider* BrowserChildProcessHost::GetPortProvider() {
return MachBroker::GetInstance();
}
#endif
// static
BrowserChildProcessHostImpl::BrowserChildProcessList*
BrowserChildProcessHostImpl::GetIterator() {
return g_child_process_list.Pointer();
}
// static
void BrowserChildProcessHostImpl::AddObserver(
BrowserChildProcessObserver* observer) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
g_observers.Get().AddObserver(observer);
}
// static
void BrowserChildProcessHostImpl::RemoveObserver(
BrowserChildProcessObserver* observer) {
// TODO(phajdan.jr): Check thread after fixing http://crbug.com/167126.
g_observers.Get().RemoveObserver(observer);
}
BrowserChildProcessHostImpl::BrowserChildProcessHostImpl(
int process_type,
BrowserChildProcessHostDelegate* delegate)
: data_(process_type),
delegate_(delegate),
power_monitor_message_broadcaster_(this) {
data_.id = ChildProcessHostImpl::GenerateChildProcessUniqueId();
child_process_host_.reset(ChildProcessHost::Create(this));
AddFilter(new TraceMessageFilter);
AddFilter(new ProfilerMessageFilter(process_type));
AddFilter(new HistogramMessageFilter);
g_child_process_list.Get().push_back(this);
GetContentClient()->browser()->BrowserChildProcessHostCreated(this);
}
BrowserChildProcessHostImpl::~BrowserChildProcessHostImpl() {
g_child_process_list.Get().remove(this);
#if defined(OS_WIN)
DeleteProcessWaitableEvent(early_exit_watcher_.GetWatchedEvent());
#endif
}
// static
void BrowserChildProcessHostImpl::TerminateAll() {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
// Make a copy since the BrowserChildProcessHost dtor mutates the original
// list.
BrowserChildProcessList copy = g_child_process_list.Get();
for (BrowserChildProcessList::iterator it = copy.begin();
it != copy.end(); ++it) {
delete (*it)->delegate(); // ~*HostDelegate deletes *HostImpl.
}
}
void BrowserChildProcessHostImpl::Launch(
SandboxedProcessLauncherDelegate* delegate,
CommandLine* cmd_line) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
GetContentClient()->browser()->AppendExtraCommandLineSwitches(
cmd_line, data_.id);
const CommandLine& browser_command_line = *CommandLine::ForCurrentProcess();
static const char* kForwardSwitches[] = {
switches::kDisableLogging,
switches::kEnableLogging,
switches::kLoggingLevel,
switches::kTraceToConsole,
switches::kV,
switches::kVModule,
#if defined(OS_POSIX)
switches::kChildCleanExit,
#endif
#if defined(OS_WIN)
switches::kEnableHighResolutionTime,
#endif
};
cmd_line->CopySwitchesFrom(browser_command_line, kForwardSwitches,
arraysize(kForwardSwitches));
child_process_.reset(new ChildProcessLauncher(
delegate,
cmd_line,
data_.id,
this));
}
const ChildProcessData& BrowserChildProcessHostImpl::GetData() const {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
return data_;
}
ChildProcessHost* BrowserChildProcessHostImpl::GetHost() const {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
return child_process_host_.get();
}
base::ProcessHandle BrowserChildProcessHostImpl::GetHandle() const {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
DCHECK(child_process_.get())
<< "Requesting a child process handle before launching.";
DCHECK(child_process_->GetHandle())
<< "Requesting a child process handle before launch has completed OK.";
return child_process_->GetHandle();
}
void BrowserChildProcessHostImpl::SetNaClDebugStubPort(int port) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
data_.nacl_debug_stub_port = port;
}
void BrowserChildProcessHostImpl::SetName(const base::string16& name) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
data_.name = name;
}
void BrowserChildProcessHostImpl::SetHandle(base::ProcessHandle handle) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
data_.handle = handle;
}
void BrowserChildProcessHostImpl::ForceShutdown() {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
g_child_process_list.Get().remove(this);
child_process_host_->ForceShutdown();
}
void BrowserChildProcessHostImpl::SetBackgrounded(bool backgrounded) {
child_process_->SetProcessBackgrounded(backgrounded);
}
void BrowserChildProcessHostImpl::SetTerminateChildOnShutdown(
bool terminate_on_shutdown) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
child_process_->SetTerminateChildOnShutdown(terminate_on_shutdown);
}
void BrowserChildProcessHostImpl::AddFilter(BrowserMessageFilter* filter) {
child_process_host_->AddFilter(filter->GetFilter());
}
void BrowserChildProcessHostImpl::NotifyProcessInstanceCreated(
const ChildProcessData& data) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
FOR_EACH_OBSERVER(BrowserChildProcessObserver, g_observers.Get(),
BrowserChildProcessInstanceCreated(data));
}
base::TerminationStatus BrowserChildProcessHostImpl::GetTerminationStatus(
bool known_dead, int* exit_code) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
if (!child_process_) // If the delegate doesn't use Launch() helper.
return base::GetTerminationStatus(data_.handle, exit_code);
return child_process_->GetChildTerminationStatus(known_dead,
exit_code);
}
bool BrowserChildProcessHostImpl::OnMessageReceived(
const IPC::Message& message) {
return delegate_->OnMessageReceived(message);
}
void BrowserChildProcessHostImpl::OnChannelConnected(int32 peer_pid) {
#if defined(OS_WIN)
// From this point onward, the exit of the child process is detected by an
// error on the IPC channel.
DeleteProcessWaitableEvent(early_exit_watcher_.GetWatchedEvent());
early_exit_watcher_.StopWatching();
#endif
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
base::Bind(&NotifyProcessHostConnected, data_));
delegate_->OnChannelConnected(peer_pid);
}
void BrowserChildProcessHostImpl::OnChannelError() {
delegate_->OnChannelError();
}
bool BrowserChildProcessHostImpl::CanShutdown() {
return delegate_->CanShutdown();
}
void BrowserChildProcessHostImpl::OnChildDisconnected() {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
if (child_process_.get() || data_.handle) {
DCHECK(data_.handle != base::kNullProcessHandle);
int exit_code;
base::TerminationStatus status = GetTerminationStatus(
true /* known_dead */, &exit_code);
switch (status) {
case base::TERMINATION_STATUS_PROCESS_CRASHED:
case base::TERMINATION_STATUS_ABNORMAL_TERMINATION: {
delegate_->OnProcessCrashed(exit_code);
BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
base::Bind(&NotifyProcessCrashed, data_));
UMA_HISTOGRAM_ENUMERATION("ChildProcess.Crashed2",
data_.process_type,
PROCESS_TYPE_MAX);
break;
}
case base::TERMINATION_STATUS_PROCESS_WAS_KILLED: {
delegate_->OnProcessCrashed(exit_code);
// Report that this child process was killed.
UMA_HISTOGRAM_ENUMERATION("ChildProcess.Killed2",
data_.process_type,
PROCESS_TYPE_MAX);
break;
}
case base::TERMINATION_STATUS_STILL_RUNNING: {
UMA_HISTOGRAM_ENUMERATION("ChildProcess.DisconnectedAlive2",
data_.process_type,
PROCESS_TYPE_MAX);
}
default:
break;
}
UMA_HISTOGRAM_ENUMERATION("ChildProcess.Disconnected2",
data_.process_type,
PROCESS_TYPE_MAX);
}
BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
base::Bind(&NotifyProcessHostDisconnected, data_));
delete delegate_; // Will delete us
}
bool BrowserChildProcessHostImpl::Send(IPC::Message* message) {
return child_process_host_->Send(message);
}
void BrowserChildProcessHostImpl::OnProcessLaunchFailed() {
delegate_->OnProcessLaunchFailed();
delete delegate_; // Will delete us
}
void BrowserChildProcessHostImpl::OnProcessLaunched() {
base::ProcessHandle handle = child_process_->GetHandle();
if (!handle) {
delete delegate_; // Will delete us
return;
}
#if defined(OS_WIN)
// Start a WaitableEventWatcher that will invoke OnProcessExitedEarly if the
// child process exits. This watcher is stopped once the IPC channel is
// connected and the exit of the child process is detecter by an error on the
// IPC channel thereafter.
DCHECK(!early_exit_watcher_.GetWatchedEvent());
early_exit_watcher_.StartWatching(
new base::WaitableEvent(handle),
base::Bind(&BrowserChildProcessHostImpl::OnProcessExitedEarly,
base::Unretained(this)));
#endif
data_.handle = handle;
delegate_->OnProcessLaunched();
}
#if defined(OS_WIN)
void BrowserChildProcessHostImpl::DeleteProcessWaitableEvent(
base::WaitableEvent* event) {
if (!event)
return;
// The WaitableEvent does not own the process handle so ensure it does not
// close it.
event->Release();
delete event;
}
void BrowserChildProcessHostImpl::OnProcessExitedEarly(
base::WaitableEvent* event) {
DeleteProcessWaitableEvent(event);
OnChildDisconnected();
}
#endif
} // namespace content
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