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// Copyright (c) 2009 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 "chrome/common/child_process_host.h"
#include "base/compiler_specific.h"
#include "base/logging.h"
#include "base/message_loop.h"
#include "base/process_util.h"
#include "base/singleton.h"
#include "base/waitable_event.h"
#include "chrome/browser/chrome_thread.h"
#include "chrome/common/common_message_utils.h"
#include "chrome/common/notification_service.h"
#include "chrome/common/notification_type.h"
#include "chrome/common/plugin_messages.h"
#include "chrome/common/process_watcher.h"
#include "chrome/common/result_codes.h"
#include "ipc/ipc_logging.h"
namespace {
typedef std::list<ChildProcessHost*> ChildProcessList;
// The NotificationTask is used to notify about plugin process connection/
// disconnection. It is needed because the notifications in the
// NotificationService must happen in the main thread.
class ChildNotificationTask : public Task {
public:
ChildNotificationTask(
NotificationType notification_type, ChildProcessInfo* info)
: notification_type_(notification_type), info_(*info) { }
virtual void Run() {
NotificationService::current()->
Notify(notification_type_, NotificationService::AllSources(),
Details<ChildProcessInfo>(&info_));
}
private:
NotificationType notification_type_;
ChildProcessInfo info_;
};
} // namespace
ChildProcessHost::ChildProcessHost(
ProcessType type, ResourceDispatcherHost* resource_dispatcher_host)
: Receiver(type),
ALLOW_THIS_IN_INITIALIZER_LIST(listener_(this)),
resource_dispatcher_host_(resource_dispatcher_host),
opening_channel_(false),
process_event_(NULL) {
Singleton<ChildProcessList>::get()->push_back(this);
}
ChildProcessHost::~ChildProcessHost() {
Singleton<ChildProcessList>::get()->remove(this);
if (handle()) {
watcher_.StopWatching();
ProcessWatcher::EnsureProcessTerminated(handle());
#if defined(OS_WIN)
// Above call took ownership, so don't want WaitableEvent to assert because
// the handle isn't valid anymore.
process_event_->Release();
#endif
}
}
bool ChildProcessHost::CreateChannel() {
channel_id_ = GenerateRandomChannelID(this);
channel_.reset(new IPC::Channel(
channel_id_, IPC::Channel::MODE_SERVER, &listener_));
if (!channel_->Connect())
return false;
opening_channel_ = true;
return true;
}
void ChildProcessHost::SetHandle(base::ProcessHandle process) {
#if defined(OS_WIN)
process_event_.reset(new base::WaitableEvent(process));
DCHECK(!handle());
set_handle(process);
watcher_.StartWatching(process_event_.get(), this);
#endif
}
void ChildProcessHost::InstanceCreated() {
Notify(NotificationType::CHILD_INSTANCE_CREATED);
}
bool ChildProcessHost::Send(IPC::Message* msg) {
if (!channel_.get()) {
delete msg;
return false;
}
return channel_->Send(msg);
}
void ChildProcessHost::Notify(NotificationType type) {
resource_dispatcher_host_->ui_loop()->PostTask(
FROM_HERE, new ChildNotificationTask(type, this));
}
void ChildProcessHost::OnWaitableEventSignaled(base::WaitableEvent *event) {
#if defined(OS_WIN)
HANDLE object = event->handle();
DCHECK(handle());
DCHECK_EQ(object, handle());
bool did_crash = base::DidProcessCrash(object);
if (did_crash) {
// Report that this child process crashed.
Notify(NotificationType::CHILD_PROCESS_CRASHED);
}
// Notify in the main loop of the disconnection.
Notify(NotificationType::CHILD_PROCESS_HOST_DISCONNECTED);
#endif
delete this;
}
ChildProcessHost::ListenerHook::ListenerHook(ChildProcessHost* host)
: host_(host) {
}
void ChildProcessHost::ListenerHook::OnMessageReceived(
const IPC::Message& msg) {
#ifdef IPC_MESSAGE_LOG_ENABLED
IPC::Logging* logger = IPC::Logging::current();
if (msg.type() == IPC_LOGGING_ID) {
logger->OnReceivedLoggingMessage(msg);
return;
}
if (logger->Enabled())
logger->OnPreDispatchMessage(msg);
#endif
bool msg_is_ok = true;
bool handled = host_->resource_dispatcher_host_->OnMessageReceived(
msg, host_, &msg_is_ok);
if (!handled) {
if (msg.type() == PluginProcessHostMsg_ShutdownRequest::ID) {
// Must remove the process from the list now, in case it gets used for a
// new instance before our watcher tells us that the process terminated.
Singleton<ChildProcessList>::get()->remove(host_);
if (host_->CanShutdown())
host_->Send(new PluginProcessMsg_Shutdown());
} else {
host_->OnMessageReceived(msg);
}
}
if (!msg_is_ok)
base::KillProcess(host_->handle(), ResultCodes::KILLED_BAD_MESSAGE, false);
#ifdef IPC_MESSAGE_LOG_ENABLED
if (logger->Enabled())
logger->OnPostDispatchMessage(msg, host_->channel_id_);
#endif
}
void ChildProcessHost::ListenerHook::OnChannelConnected(int32 peer_pid) {
host_->opening_channel_ = false;
host_->OnChannelConnected(peer_pid);
host_->Send(new PluginProcessMsg_AskBeforeShutdown());
// Notify in the main loop of the connection.
host_->Notify(NotificationType::CHILD_PROCESS_HOST_CONNECTED);
}
void ChildProcessHost::ListenerHook::OnChannelError() {
host_->opening_channel_ = false;
host_->OnChannelError();
}
ChildProcessHost::Iterator::Iterator() : all_(true) {
DCHECK(MessageLoop::current() ==
ChromeThread::GetMessageLoop(ChromeThread::IO)) <<
"ChildProcessInfo::Iterator must be used on the IO thread.";
iterator_ = Singleton<ChildProcessList>::get()->begin();
}
ChildProcessHost::Iterator::Iterator(ProcessType type)
: all_(false), type_(type) {
DCHECK(MessageLoop::current() ==
ChromeThread::GetMessageLoop(ChromeThread::IO)) <<
"ChildProcessInfo::Iterator must be used on the IO thread.";
iterator_ = Singleton<ChildProcessList>::get()->begin();
if (!Done() && (*iterator_)->type() != type_)
++(*this);
}
ChildProcessHost* ChildProcessHost::Iterator::operator++() {
do {
++iterator_;
if (Done())
break;
if (!all_ && (*iterator_)->type() != type_)
continue;
return *iterator_;
} while (true);
return NULL;
}
bool ChildProcessHost::Iterator::Done() {
return iterator_ == Singleton<ChildProcessList>::get()->end();
}
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