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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.
#ifndef CONTENT_COMMON_CHILD_PROCESS_HOST_IMPL_H_
#define CONTENT_COMMON_CHILD_PROCESS_HOST_IMPL_H_
#pragma once
#include <string>
#include <vector>
#include "build/build_config.h"
#include "base/basictypes.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/singleton.h"
#include "base/shared_memory.h"
#include "base/string16.h"
#include "content/public/common/child_process_host.h"
class FilePath;
namespace content {
class ChildProcessHostDelegate;
// Provides common functionality for hosting a child process and processing IPC
// messages between the host and the child process. Users are responsible
// for the actual launching and terminating of the child processes.
class CONTENT_EXPORT ChildProcessHostImpl : public ChildProcessHost,
public IPC::Channel::Listener {
public:
virtual ~ChildProcessHostImpl();
// Public and static for reuse by RenderMessageFilter.
static void AllocateSharedMemory(
uint32 buffer_size, base::ProcessHandle child_process,
base::SharedMemoryHandle* handle);
// Generates a unique channel name for a child process.
// The "instance" pointer value is baked into the channel id.
static std::string GenerateRandomChannelID(void* instance);
// Returns a unique ID to identify a child process. On construction, this
// function will be used to generate the id_, but it is also used to generate
// IDs for the RenderProcessHost, which doesn't inherit from us, and whose IDs
// must be unique for all child processes.
//
// This function is threadsafe since RenderProcessHost is on the UI thread,
// but normally this will be used on the IO thread.
static int GenerateChildProcessUniqueId();
// ChildProcessHost implementation
virtual bool Send(IPC::Message* message) OVERRIDE;
virtual void ForceShutdown() OVERRIDE;
virtual std::string CreateChannel() OVERRIDE;
virtual bool IsChannelOpening() OVERRIDE;
virtual void AddFilter(IPC::ChannelProxy::MessageFilter* filter) OVERRIDE;
#if defined(OS_POSIX)
virtual int TakeClientFileDescriptor() OVERRIDE;
#endif
private:
friend class ChildProcessHost;
explicit ChildProcessHostImpl(ChildProcessHostDelegate* delegate);
// IPC::Channel::Listener methods:
virtual bool OnMessageReceived(const IPC::Message& msg) OVERRIDE;
virtual void OnChannelConnected(int32 peer_pid) OVERRIDE;
virtual void OnChannelError() OVERRIDE;
// Message handlers:
void OnShutdownRequest();
void OnAllocateSharedMemory(uint32 buffer_size,
base::SharedMemoryHandle* handle);
ChildProcessHostDelegate* delegate_;
base::ProcessHandle peer_handle_;
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(ChildProcessHostImpl);
};
} // namespace content
#endif // CONTENT_COMMON_CHILD_PROCESS_HOST_IMPL_H_
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