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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.
#ifndef CONTENT_BROWSER_MACH_BROKER_MAC_H_
#define CONTENT_BROWSER_MACH_BROKER_MAC_H_
#include <map>
#include <string>
#include "base/mac/mach_port_broker.h"
#include "base/macros.h"
#include "base/memory/singleton.h"
#include "base/process/port_provider_mac.h"
#include "base/process/process_handle.h"
#include "base/synchronization/lock.h"
#include "content/public/browser/browser_child_process_observer.h"
#include "content/public/browser/notification_observer.h"
#include "content/public/browser/notification_registrar.h"
namespace content {
// A global |MachBroker| singleton is used by content embedders to provide
// access to mach task ports for content child processes.
class CONTENT_EXPORT MachBroker : public base::PortProvider,
public BrowserChildProcessObserver,
public NotificationObserver,
public base::PortProvider::Observer {
public:
// For use in child processes. This will send the task port of the current
// process over Mach IPC to the port registered by name (via this class) in
// the parent process. Returns true if the message was sent successfully
// and false if otherwise.
static bool ChildSendTaskPortToParent();
// Returns the global MachBroker.
static MachBroker* GetInstance();
// The lock that protects this MachBroker object. Clients MUST acquire and
// release this lock around calls to EnsureRunning() and PlaceholderForPid().
base::Lock& GetLock();
// Performs any necessary setup that cannot happen in the constructor.
// Callers MUST acquire the lock given by GetLock() before calling this
// method (and release the lock afterwards).
void EnsureRunning();
// Adds a placeholder to the map for the given pid with MACH_PORT_NULL.
// Callers MUST acquire the lock given by GetLock() before calling this method
// (and release the lock afterwards).
void AddPlaceholderForPid(base::ProcessHandle pid, int child_process_id);
// Implement |base::PortProvider|.
mach_port_t TaskForPid(base::ProcessHandle process) const override;
// Implement |BrowserChildProcessObserver|.
void BrowserChildProcessHostDisconnected(
const ChildProcessData& data) override;
void BrowserChildProcessCrashed(const ChildProcessData& data,
int exit_code) override;
// Implement |NotificationObserver|.
void Observe(int type,
const NotificationSource& source,
const NotificationDetails& details) override;
// Returns the Mach port name to use when sending or receiving messages.
// Does the Right Thing in the browser and in child processes.
static std::string GetMachPortName();
private:
friend class MachBrokerTest;
friend struct base::DefaultSingletonTraits<MachBroker>;
MachBroker();
~MachBroker() override;
// Implement |base::PortProvider::Observer|.
void OnReceivedTaskPort(base::ProcessHandle process) override;
// Removes all mappings belonging to |child_process_id| from the broker.
void InvalidateChildProcessId(int child_process_id);
// Callback used to register notifications on the UI thread.
void RegisterNotifications();
// Whether or not the class has been initialized.
bool initialized_;
// Used to register for notifications received by NotificationObserver.
// Accessed only on the UI thread.
NotificationRegistrar registrar_;
// Stores the Child process unique id (RenderProcessHost ID) for every
// process. Protected by base::MachPortBroker::GetLock().
typedef std::map<int, base::ProcessHandle> ChildProcessIdMap;
ChildProcessIdMap child_process_id_map_;
// Underlying port broker that receives and manages mach ports.
base::MachPortBroker broker_;
DISALLOW_COPY_AND_ASSIGN(MachBroker);
};
} // namespace content
#endif // CONTENT_BROWSER_MACH_BROKER_MAC_H_
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