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// Copyright (c) 2011 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/service_process_util.h"
#include "base/command_line.h"
#include "base/file_util.h"
#include "base/logging.h"
#include "base/path_service.h"
#include "base/string16.h"
#include "base/utf_string_conversions.h"
#include "base/win/object_watcher.h"
#include "base/win/scoped_handle.h"
#include "base/win/win_util.h"
#include "chrome/common/chrome_switches.h"
namespace {
string16 GetServiceProcessReadyEventName() {
return UTF8ToWide(
GetServiceProcessScopedVersionedName("_service_ready"));
}
string16 GetServiceProcessShutdownEventName() {
return UTF8ToWide(
GetServiceProcessScopedVersionedName("_service_shutdown_evt"));
}
class ServiceProcessShutdownMonitor
: public base::win::ObjectWatcher::Delegate {
public:
explicit ServiceProcessShutdownMonitor(Task* shutdown_task)
: shutdown_task_(shutdown_task) {
}
void Start() {
string16 event_name = GetServiceProcessShutdownEventName();
CHECK(event_name.length() <= MAX_PATH);
shutdown_event_.Set(CreateEvent(NULL, TRUE, FALSE, event_name.c_str()));
watcher_.StartWatching(shutdown_event_.Get(), this);
}
// base::ObjectWatcher::Delegate implementation.
virtual void OnObjectSignaled(HANDLE object) {
shutdown_task_->Run();
shutdown_task_.reset();
}
private:
base::win::ScopedHandle shutdown_event_;
base::win::ObjectWatcher watcher_;
scoped_ptr<Task> shutdown_task_;
};
} // namespace
bool ForceServiceProcessShutdown(const std::string& version) {
base::win::ScopedHandle shutdown_event;
std::string versioned_name = version;
versioned_name.append("_service_shutdown_evt");
string16 event_name =
UTF8ToWide(GetServiceProcessScopedName(versioned_name));
shutdown_event.Set(OpenEvent(EVENT_MODIFY_STATE, FALSE, event_name.c_str()));
if (!shutdown_event.IsValid())
return false;
SetEvent(shutdown_event.Get());
return true;
}
bool CheckServiceProcessReady() {
string16 event_name = GetServiceProcessReadyEventName();
base::win::ScopedHandle event(
OpenEvent(SYNCHRONIZE | READ_CONTROL, false, event_name.c_str()));
if (!event.IsValid())
return false;
// Check if the event is signaled.
return WaitForSingleObject(event, 0) == WAIT_OBJECT_0;
}
struct ServiceProcessState::StateData {
// An event that is signaled when a service process is ready.
base::win::ScopedHandle ready_event;
scoped_ptr<ServiceProcessShutdownMonitor> shutdown_monitor;
};
bool ServiceProcessState::TakeSingletonLock() {
DCHECK(!state_);
string16 event_name = GetServiceProcessReadyEventName();
CHECK(event_name.length() <= MAX_PATH);
base::win::ScopedHandle service_process_ready_event;
service_process_ready_event.Set(
CreateEvent(NULL, TRUE, FALSE, event_name.c_str()));
DWORD error = GetLastError();
if ((error == ERROR_ALREADY_EXISTS) || (error == ERROR_ACCESS_DENIED))
return false;
DCHECK(service_process_ready_event.IsValid());
state_ = new StateData;
state_->ready_event.Set(service_process_ready_event.Take());
return true;
}
void ServiceProcessState::SignalReady(Task* shutdown_task) {
DCHECK(state_);
DCHECK(state_->ready_event.IsValid());
SetEvent(state_->ready_event.Get());
if (shutdown_task) {
state_->shutdown_monitor.reset(
new ServiceProcessShutdownMonitor(shutdown_task));
state_->shutdown_monitor->Start();
}
}
void ServiceProcessState::SignalStopped() {
TearDownState();
shared_mem_service_data_.reset();
}
bool ServiceProcessState::AddToAutoRun() {
FilePath chrome_path;
if (PathService::Get(base::FILE_EXE, &chrome_path)) {
CommandLine cmd_line(chrome_path);
cmd_line.AppendSwitchASCII(switches::kProcessType,
switches::kServiceProcess);
// We need a unique name for the command per user-date-dir. Just use the
// channel name.
return base::win::AddCommandToAutoRun(
HKEY_CURRENT_USER,
UTF8ToWide(GetAutoRunKey()),
cmd_line.command_line_string());
}
return false;
}
bool ServiceProcessState::RemoveFromAutoRun() {
return base::win::RemoveCommandFromAutoRun(
HKEY_CURRENT_USER, UTF8ToWide(GetAutoRunKey()));
}
void ServiceProcessState::TearDownState() {
delete state_;
state_ = NULL;
}
bool ServiceProcessState::ShouldHandleOtherVersion() {
return true;
}
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