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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.
#include <stddef.h>
#include <stdint.h>
#include <memory>
#include <string>
#include <vector>
#include "base/macros.h"
#include "base/memory/shared_memory.h"
#include "base/memory/singleton.h"
#include "base/process/process.h"
#include "base/strings/string16.h"
#include "build/build_config.h"
#include "content/common/child_control.mojom.h"
#include "content/public/common/child_process_host.h"
#include "ipc/ipc_listener.h"
namespace IPC {
class MessageFilter;
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::Listener {
~ChildProcessHostImpl() override;
// 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.
// This will never return ChildProcessHost::kInvalidUniqueID.
static int GenerateChildProcessUniqueId();
// Derives a tracing process id from a child process id. Child process ids
// cannot be used directly in child process for tracing due to security
// reasons (see: discussion in This method is meant to
// be used when tracing for identifying cross-process shared memory from a
// process which knows the child process id of its endpoints. The value
// returned by this method is guaranteed to be equal to the value returned by
// MemoryDumpManager::GetTracingProcessId() in the corresponding child
// process.
// Never returns MemoryDumpManager::kInvalidTracingProcessId.
// Returns only memory_instrumentation::mojom::kServiceTracingProcessId in
// single-process mode.
static uint64_t ChildProcessUniqueIdToTracingProcessId(int child_process_id);
// ChildProcessHost implementation
bool Send(IPC::Message* message) override;
void ForceShutdown() override;
void CreateChannelMojo() override;
bool IsChannelOpening() override;
void AddFilter(IPC::MessageFilter* filter) override;
void BindInterface(const std::string& interface_name,
mojo::ScopedMessagePipeHandle interface_pipe) override;
friend class ChildProcessHost;
explicit ChildProcessHostImpl(ChildProcessHostDelegate* delegate);
// IPC::Listener methods:
bool OnMessageReceived(const IPC::Message& msg) override;
void OnChannelConnected(int32_t peer_pid) override;
void OnChannelError() override;
void OnBadMessageReceived(const IPC::Message& message) override;
// Initializes the IPC channel and returns true on success. |channel_| must be
// non-null.
bool InitChannel();
ChildProcessHostDelegate* delegate_;
base::Process peer_process_;
bool opening_channel_; // True while we're waiting the channel to be opened.
std::unique_ptr<IPC::Channel> channel_;
mojom::ChildControlPtr child_control_;
// 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::MessageFilter> > filters_;
} // namespace content