Separates ipc code from common (http://crbug.com/16829)

chrome/common/ipc_channel_posix.h

-// Copyright (c) 2008 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_IPC_CHANNEL_POSIX_H_
-#define CHROME_COMMON_IPC_CHANNEL_POSIX_H_
-
-#include "chrome/common/ipc_channel.h"
-
-#include <sys/socket.h>  // for CMSG macros
-
-#include <queue>
-#include <string>
-#include <vector>
-
-#include "base/message_loop.h"
-#include "chrome/common/file_descriptor_set_posix.h"
-
-namespace IPC {
-
-// Store that channel name |name| is available via socket |socket|.
-// Used when the channel has been precreated by another process on
-// our behalf and they've just shipped us the socket.
-void AddChannelSocket(const std::string& name, int socket);
-
-// Remove the channel name mapping, and close the corresponding socket.
-void RemoveAndCloseChannelSocket(const std::string& name);
-
-// Construct a socket pair appropriate for IPC: UNIX domain, nonblocking.
-// Returns false on error.
-bool SocketPair(int* fd1, int* fd2);
-
-// An implementation of ChannelImpl for POSIX systems that works via
-// socketpairs.  See the .cc file for an overview of the implementation.
-class Channel::ChannelImpl : public MessageLoopForIO::Watcher {
- public:
-  // Mirror methods of Channel, see ipc_channel.h for description.
-  ChannelImpl(const std::string& channel_id, Mode mode, Listener* listener);
-  ~ChannelImpl() { Close(); }
-  bool Connect();
-  void Close();
-  void set_listener(Listener* listener) { listener_ = listener; }
-  bool Send(Message* message);
-  int GetClientFileDescriptor() const;
-
- private:
-  bool CreatePipe(const std::string& channel_id, Mode mode);
-
-  bool ProcessIncomingMessages();
-  bool ProcessOutgoingMessages();
-
-  // MessageLoopForIO::Watcher implementation.
-  virtual void OnFileCanReadWithoutBlocking(int fd);
-  virtual void OnFileCanWriteWithoutBlocking(int fd);
-
-  Mode mode_;
-
-  // After accepting one client connection on our server socket we want to
-  // stop listening.
-  MessageLoopForIO::FileDescriptorWatcher server_listen_connection_watcher_;
-  MessageLoopForIO::FileDescriptorWatcher read_watcher_;
-  MessageLoopForIO::FileDescriptorWatcher write_watcher_;
-
-  // Indicates whether we're currently blocked waiting for a write to complete.
-  bool is_blocked_on_write_;
-
-  // If sending a message blocks then we use this variable
-  // to keep track of where we are.
-  size_t message_send_bytes_written_;
-
-  // If the kTestingChannelID flag is specified, we use a FIFO instead of
-  // a socketpair().
-  bool uses_fifo_;
-
-  // File descriptor we're listening on for new connections in the FIFO case;
-  // unused otherwise.
-  int server_listen_pipe_;
-
-  // The pipe used for communication.
-  int pipe_;
-
-  // For a server, the client end of our socketpair() -- the other end of our
-  // pipe_ that is passed to the client.
-  int client_pipe_;
-
-  // The "name" of our pipe.  On Windows this is the global identifier for
-  // the pipe.  On POSIX it's used as a key in a local map of file descriptors.
-  std::string pipe_name_;
-
-  Listener* listener_;
-
-  // Messages to be sent are queued here.
-  std::queue<Message*> output_queue_;
-
-  // We read from the pipe into this buffer
-  char input_buf_[Channel::kReadBufferSize];
-
-  enum {
-    // We assume a worst case: kReadBufferSize bytes of messages, where each
-    // message has no payload and a full complement of descriptors.
-    MAX_READ_FDS = (Channel::kReadBufferSize / sizeof(IPC::Message::Header)) *
-                   FileDescriptorSet::MAX_DESCRIPTORS_PER_MESSAGE,
-  };
-
-  // This is a control message buffer large enough to hold kMaxReadFDs
-#if defined(OS_MACOSX)
-  // TODO(agl): OSX appears to have non-constant CMSG macros!
-  char input_cmsg_buf_[1024];
-#else
-  char input_cmsg_buf_[CMSG_SPACE(sizeof(int) * MAX_READ_FDS)];
-#endif
-
-  // Large messages that span multiple pipe buffers, get built-up using
-  // this buffer.
-  std::string input_overflow_buf_;
-  std::vector<int> input_overflow_fds_;
-
-  // In server-mode, we have to wait for the client to connect before we
-  // can begin reading.  We make use of the input_state_ when performing
-  // the connect operation in overlapped mode.
-  bool waiting_connect_;
-
-  // This flag is set when processing incoming messages.  It is used to
-  // avoid recursing through ProcessIncomingMessages, which could cause
-  // problems.  TODO(darin): make this unnecessary
-  bool processing_incoming_;
-
-  ScopedRunnableMethodFactory<ChannelImpl> factory_;
-
-  DISALLOW_COPY_AND_ASSIGN(ChannelImpl);
-};
-
-}  // namespace IPC
-
-#endif  // CHROME_COMMON_IPC_CHANNEL_POSIX_H_