IPC::Channel: Reduce POSIX specific API surface

ipc/ipc_channel_posix.h

 // 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.
 
 #ifndef IPC_IPC_CHANNEL_POSIX_H_
 #define IPC_IPC_CHANNEL_POSIX_H_
 
 #include "ipc/ipc_channel.h"
 
 #include <sys/socket.h>  // for CMSG macros
@@ skipping 31 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 {
 
-class ChannelPosix : public Channel,
-                     public internal::ChannelReader,
-                     public base::MessageLoopForIO::Watcher {
+class IPC_EXPORT ChannelPosix : public Channel,
+                                public internal::ChannelReader,
+                                public base::MessageLoopForIO::Watcher {
  public:
-  // Mirror methods of Channel, see ipc_channel.h for description.
   ChannelPosix(const IPC::ChannelHandle& channel_handle, Mode mode,
                Listener* listener);
   virtual ~ChannelPosix();
 
   // Channel implementation
   virtual bool Connect() OVERRIDE;
   virtual void Close() OVERRIDE;
   virtual bool Send(Message* message) OVERRIDE;
   virtual base::ProcessId GetPeerPID() const OVERRIDE;
   virtual int GetClientFileDescriptor() const OVERRIDE;
   virtual int TakeClientFileDescriptor() OVERRIDE;
-  virtual bool AcceptsConnections() const OVERRIDE;
-  virtual bool HasAcceptedConnection() const OVERRIDE;
-  virtual bool GetPeerEuid(uid_t* peer_euid) const OVERRIDE;
-  virtual void ResetToAcceptingConnectionState() OVERRIDE;
+
+  // Returns true if the channel supports listening for connections.
+  bool AcceptsConnections() const;
+
+  // Returns true if the channel supports listening for connections and is
+  // currently connected.
+  bool HasAcceptedConnection() const;
+
+  // Closes any currently connected socket, and returns to a listening state
+  // for more connections.
+  void ResetToAcceptingConnectionState();
+
+  // Returns true if the peer process' effective user id can be determined, in
+  // which case the supplied peer_euid is updated with it.
+  bool GetPeerEuid(uid_t* peer_euid) const;
 
   void CloseClientFileDescriptor();
 
   static bool IsNamedServerInitialized(const std::string& channel_id);
 #if defined(OS_LINUX)
   static void SetGlobalPid(int pid);
 #endif  // OS_LINUX
 
  private:
   bool CreatePipe(const IPC::ChannelHandle& channel_handle);
@@ skipping 124 matching lines @@
   // If non-zero, overrides the process ID sent in the hello message.
   static int global_pid_;
 #endif  // OS_LINUX
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(ChannelPosix);
 };
 
 }  // namespace IPC
 
 #endif  // IPC_IPC_CHANNEL_POSIX_H_