nacl_io: Add SOCK_DGRAM support to socketpair()

native_client_sdk/src/libraries/nacl_io/socket/fifo_packet.h

 // Copyright 2013 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 LIBRARIES_NACL_IO_FIFO_PACKET_H_
 #define LIBRARIES_NACL_IO_FIFO_PACKET_H_
 
+#include <stdint.h>
 #include <string.h>
 
 #include <list>
 
 #include "nacl_io/fifo_interface.h"
 #include "ppapi/c/pp_resource.h"
 
 #include "sdk_util/macros.h"
 
 namespace nacl_io {
@@ skipping 20 matching lines @@
 
   // Return a pointer to the top packet without releasing ownership.
   Packet* PeekPacket();
 
   // Relinquish top packet, and remove it from the FIFO.
   Packet* ReadPacket();
 
   // Take ownership of packet and place it in the FIFO.
   void WritePacket(Packet* packet);
 
+  // Read out the top packet into a byte buffer.
+  size_t Read(void* buf, size_t len);
+
+  // Enqueue a new packet from a byte buffer.
+  size_t Write(const void* buf, size_t len);
+
  private:
   std::list<Packet*> packets_;
   uint32_t max_bytes_;
   uint32_t cur_bytes_;
 
   DISALLOW_COPY_AND_ASSIGN(FIFOPacket);
 };
 
 }  // namespace nacl_io
 
 #endif  // LIBRARIES_NACL_IO_FIFO_PACKET_H_