diff -r 000000000000 -r 6474c204b198 ipc/chromium/src/chrome/common/ipc_channel_posix.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ipc/chromium/src/chrome/common/ipc_channel_posix.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,170 @@
+// 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 <list>
+
+#include "base/message_loop.h"
+#include "chrome/common/file_descriptor_set_posix.h"
+
+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 std::wstring& channel_id, Mode mode, Listener* listener);
+  ChannelImpl(int fd, Mode mode, Listener* listener);
+  ~ChannelImpl() { Close(); }
+  bool Connect();
+  void Close();
+  Listener* set_listener(Listener* listener) {
+    Listener* old = listener_;
+    listener_ = listener;
+    return old;
+  }
+  bool Send(Message* message);
+  void GetClientFileDescriptorMapping(int *src_fd, int *dest_fd) const;
+
+  void ResetFileDescriptor(int fd);
+
+  int GetFileDescriptor() const {
+      return pipe_;
+  }
+  void CloseClientFileDescriptor();
+
+  // See the comment in ipc_channel.h for info on Unsound_IsClosed() and
+  // Unsound_NumQueuedMessages().
+  bool Unsound_IsClosed() const;
+  uint32_t Unsound_NumQueuedMessages() const;
+
+ private:
+  void Init(Mode mode, Listener* listener);
+  bool CreatePipe(const std::wstring& channel_id, Mode mode);
+  bool EnqueueHelloMessage();
+
+  bool ProcessIncomingMessages();
+  bool ProcessOutgoingMessages();
+
+  // MessageLoopForIO::Watcher implementation.
+  virtual void OnFileCanReadWithoutBlocking(int fd);
+  virtual void OnFileCanWriteWithoutBlocking(int fd);
+
+#if defined(OS_MACOSX)
+  void CloseDescriptors(uint32_t pending_fd_id);
+#endif
+
+  void OutputQueuePush(Message* msg);
+  void OutputQueuePop();
+
+  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_;
+
+  int server_listen_pipe_;
+  int pipe_;
+  int client_pipe_;  // The client end of our socketpair().
+
+  // 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) || defined(OS_NETBSD)
+  // 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_;
+
+  // This flag is set after we've closed the channel.
+  bool closed_;
+
+#if defined(OS_MACOSX)
+  struct PendingDescriptors {
+    uint32_t id;
+    scoped_refptr<FileDescriptorSet> fds;
+
+    PendingDescriptors() : id(0) { }
+    PendingDescriptors(uint32_t id, FileDescriptorSet *fds)
+      : id(id),
+        fds(fds)
+    { }
+  };
+
+  std::list<PendingDescriptors> pending_fds_;
+
+  // A generation ID for RECEIVED_FD messages.
+  uint32_t last_pending_fd_id_;
+#endif
+
+  // This variable is updated so it matches output_queue_.size(), except we can
+  // read output_queue_length_ from any thread (if we're OK getting an
+  // occasional out-of-date or bogus value).  We use output_queue_length_ to
+  // implement Unsound_NumQueuedMessages.
+  size_t output_queue_length_;
+
+  ScopedRunnableMethodFactory<ChannelImpl> factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(ChannelImpl);
+};
+
+}  // namespace IPC
+
+#endif  // CHROME_COMMON_IPC_CHANNEL_POSIX_H_