зеркало из https://github.com/mozilla/gecko-dev.git
105 строки
3.0 KiB
C++
105 строки
3.0 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef __FORKSERVICE_CHILD_H_
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#define __FORKSERVICE_CHILD_H_
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#include "base/process_util.h"
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#include "nsIObserver.h"
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#include "nsString.h"
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#include "mozilla/ipc/MiniTransceiver.h"
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#include <sys/types.h>
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#include <poll.h>
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namespace mozilla {
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namespace ipc {
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class GeckoChildProcessHost;
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/**
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* This is the interface to the fork server.
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*
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* When the chrome process calls |ForkServiceChild| to create a new
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* process, this class send a message to the fork server through a
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* pipe and get the PID of the new process from the reply.
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*/
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class ForkServiceChild {
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public:
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ForkServiceChild(int aFd, GeckoChildProcessHost* aProcess);
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virtual ~ForkServiceChild();
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/**
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* Ask the fork server to create a new process with given parameters.
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*
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* The fork server uses |base::LaunchApp()| to create a new
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* content process with the following parameters.
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*
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* \param aArgv assigns |argv| of the content process.
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* \param aEnvMap sets |LaunchOptions::env_map|.
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* \param aFdsRemap sets |LaunchOptions::fd_to_remap|.
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* \param aPid returns the PID of the content process created.
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* \return true if success.
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*/
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bool SendForkNewSubprocess(const nsTArray<nsCString>& aArgv,
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const nsTArray<EnvVar>& aEnvMap,
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const nsTArray<FdMapping>& aFdsRemap, pid_t* aPid);
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/**
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* Create a fork server process and the singleton of this class.
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*
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* This function uses |GeckoChildProcessHost| to launch the fork
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* server, getting the fd of a pipe/socket to the fork server from
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* it's |IPC::Channel|.
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*/
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static void StartForkServer();
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static void StopForkServer();
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/**
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* Return the singleton.
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*/
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static ForkServiceChild* Get() {
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auto child = sForkServiceChild.get();
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return child == nullptr || child->mFailed ? nullptr : child;
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}
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private:
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// Called when a message is received.
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void OnMessageReceived(IPC::Message&& message);
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void OnError();
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UniquePtr<MiniTransceiver> mTcver;
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static UniquePtr<ForkServiceChild> sForkServiceChild;
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pid_t mRecvPid;
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bool mWaitForHello;
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bool mFailed; // The forkserver has crashed or disconnected.
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GeckoChildProcessHost* mProcess;
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};
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/**
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* Start a fork server at |xpcom-startup| from the chrome process.
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*/
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class ForkServerLauncher : public nsIObserver {
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public:
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NS_DECL_ISUPPORTS
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NS_DECL_NSIOBSERVER
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ForkServerLauncher();
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static already_AddRefed<ForkServerLauncher> Create();
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private:
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friend class ForkServiceChild;
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virtual ~ForkServerLauncher();
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static void RestartForkServer();
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static bool mHaveStartedClient;
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static StaticRefPtr<ForkServerLauncher> mSingleton;
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};
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} // namespace ipc
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} // namespace mozilla
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#endif /* __FORKSERVICE_CHILD_H_ */
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