Revert 69694 - Add support for sockets that can listen and accept a connectio...

ipc/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 IPC_IPC_CHANNEL_POSIX_H_
 #define IPC_IPC_CHANNEL_POSIX_H_
 #pragma once
 
 #include "ipc/ipc_channel.h"
 
@@ skipping 22 matching lines @@
 // this switch 'on' on the Mac as well.
 
 // The HELLO message from the client to the server is always sent using
 // sendmsg because it will contain the file descriptor that the server
 // needs to send file descriptors in later messages.
 #define IPC_USES_READWRITE 1
 #endif
 
 namespace IPC {
 
+// 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 IPC::ChannelHandle& channel_handle, Mode mode,
+  ChannelImpl(const IPC::ChannelHandle &channel_handle, Mode mode,
               Listener* listener);
   ~ChannelImpl();
   bool Connect();
   void Close();
   void set_listener(Listener* listener) { listener_ = listener; }
   bool Send(Message* message);
   int GetClientFileDescriptor() const;
-  bool AcceptsConnections() const;
-  bool HasAcceptedConnection() const;
-  void ResetToAcceptingConnectionState();
 
  private:
-  bool CreatePipe(const IPC::ChannelHandle& channel_handle,
-                  bool uses_domain_sockets,
-                  bool listening_socket);
+  bool CreatePipe(const IPC::ChannelHandle &channel_handle, Mode mode);
 
   bool ProcessIncomingMessages();
   bool ProcessOutgoingMessages();
 
-  bool AcceptConnection();
-  void ClosePipeOnError();
-  void QueueHelloMessage();
-  bool IsHelloMessage(const Message* m) const;
-
   // 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_;
-  bool waiting_connect_;
 
   // If sending a message blocks then we use this variable
   // to keep track of where we are.
   size_t message_send_bytes_written_;
 
-  // File descriptor we're listening on for new connections if we listen
-  // for connections.
+  // 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_;
 
 #if defined(IPC_USES_READWRITE)
@@ skipping 27 matching lines @@
   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_;
 
-  // True if we are responsible for unlinking the unix domain socket file.
-  bool must_unlink_;
+  // 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_;
 
   ScopedRunnableMethodFactory<ChannelImpl> factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ChannelImpl);
 };
 
-// The maximum length of the name of a pipe for MODE_NAMED_SERVER or
-// MODE_NAMED_CLIENT if you want to pass in your own socket.
-// The standard size on linux is 108, mac is 104. To maintain consistency
-// across platforms we standardize on the smaller value.
-static const size_t kMaxPipeNameLength = 104;
-
 }  // namespace IPC
 
 #endif  // IPC_IPC_CHANNEL_POSIX_H_