Move ChildProcessHost and ChildProcessInfo to content.

chrome/common/child_process_host.h

-// Copyright (c) 2010 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 CHROME_COMMON_CHILD_PROCESS_HOST_H_
-#define CHROME_COMMON_CHILD_PROCESS_HOST_H_
-#pragma once
-
-#include <string>
-#include <vector>
-
-#include "build/build_config.h"
-
-#if defined(OS_WIN)
-#include <windows.h>
-#endif  // defined(OS_WIN)
-
-#include "base/basictypes.h"
-#include "base/scoped_ptr.h"
-#include "chrome/common/notification_type.h"
-#include "ipc/ipc_channel_proxy.h"
-
-class CommandLine;
-class FilePath;
-
-namespace IPC {
-class Message;
-}
-
-// Provides common functionality for hosting a child process and processing IPC
-// messages between the host and the child process. Subclasses are responsible
-// for the actual launching and terminating of the child processes.
-class ChildProcessHost : public IPC::Channel::Listener,
-                         public IPC::Message::Sender {
- public:
-  virtual ~ChildProcessHost();
-
-  // Returns the pathname to be used for a child process.  If a subprocess
-  // pathname was specified on the command line, that will be used.  Otherwise,
-  // the default child process pathname will be returned.  On most platforms,
-  // this will be the same as the currently-executing process.
-  //
-  // The argument allow_self is used on Linux to indicate that we allow us to
-  // fork from /proc/self/exe rather than using the "real" app path. This
-  // prevents autoupdate from confusing us if it changes the file out from
-  // under us. You will generally want to set this to true, except when there
-  // is an override to the command line (for example, we're forking a renderer
-  // in gdb). In this case, you'd use GetChildPath to get the real executable
-  // file name, and then prepend the GDB command to the command line.
-  //
-  // On failure, returns an empty FilePath.
-  static FilePath GetChildPath(bool allow_self);
-
-#if defined(OS_WIN)
-  // See comments in the cc file. This is a common hack needed for a process
-  // hosting a sandboxed child process. Hence it lives in this file.
-  static void PreCacheFont(LOGFONT font);
-#endif  // defined(OS_WIN)
-
-  // IPC::Message::Sender implementation.
-  virtual bool Send(IPC::Message* message);
-
- protected:
-  ChildProcessHost();
-
-  // Adds an IPC message filter.  A reference will be kept to the filter.
-  void AddFilter(IPC::ChannelProxy::MessageFilter* filter);
-
-  // Derived classes return true if it's ok to shut down the child process.
-  virtual bool CanShutdown() = 0;
-
-  // Send the shutdown message to the child process.
-  // Does not check if CanShutdown is true.
-  virtual void ForceShutdown();
-
-  // Creates the IPC channel.  Returns true iff it succeeded.
-  virtual bool CreateChannel();
-
-  // Notifies us that an instance has been created on this child process.
-  virtual void InstanceCreated();
-
-  // IPC::Channel::Listener implementation:
-  virtual bool OnMessageReceived(const IPC::Message& msg);
-  virtual void OnChannelConnected(int32 peer_pid);
-  virtual void OnChannelError();
-
-  bool opening_channel() { return opening_channel_; }
-  const std::string& channel_id() { return channel_id_; }
-  IPC::Channel* channel() { return channel_.get(); }
-
-  // Called when the child process goes away.
-  virtual void OnChildDied();
-  // Notifies the derived class that we told the child process to kill itself.
-  virtual void ShutdownStarted();
-  // Subclasses can implement specific notification methods.
-  virtual void Notify(NotificationType type);
-
- private:
-  // By using an internal class as the IPC::Channel::Listener, we can intercept
-  // OnMessageReceived/OnChannelConnected and do our own processing before
-  // calling the subclass' implementation.
-  class ListenerHook : public IPC::Channel::Listener {
-   public:
-    explicit ListenerHook(ChildProcessHost* host);
-    virtual bool OnMessageReceived(const IPC::Message& msg);
-    virtual void OnChannelConnected(int32 peer_pid);
-    virtual void OnChannelError();
-   private:
-    ChildProcessHost* host_;
-  };
-
-  ListenerHook listener_;
-
-  bool opening_channel_;  // True while we're waiting the channel to be opened.
-  scoped_ptr<IPC::Channel> channel_;
-  std::string channel_id_;
-
-  // Holds all the IPC message filters.  Since this object lives on the IO
-  // thread, we don't have a IPC::ChannelProxy and so we manage filters
-  // manually.
-  std::vector<scoped_refptr<IPC::ChannelProxy::MessageFilter> > filters_;
-
-  DISALLOW_COPY_AND_ASSIGN(ChildProcessHost);
-};
-
-#endif  // CHROME_COMMON_CHILD_PROCESS_HOST_H_