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diff --git a/src/pgm_socket.hpp b/src/pgm_socket.hpp
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+/*
+    Copyright (c) 2007-2009 FastMQ Inc.
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the Lesser GNU General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    Lesser GNU General Public License for more details.
+
+    You should have received a copy of the Lesser GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __PGM_SOCKET_HPP_INCLUDED__
+#define __PGM_SOCKET_HPP_INCLUDED__
+
+#include "platform.hpp"
+
+#if defined ZMQ_HAVE_OPENPGM
+
+#ifdef ZMQ_HAVE_LINUX
+#include <glib.h>
+#include <pgm/pgm.h>
+#else
+#include <Winsock2.h>
+#endif
+
+#include "stdint.hpp"
+#include "options.hpp"
+
+namespace zmq
+{
+    //  Encapsulates PGM socket.
+    class pgm_socket_t
+    {
+
+#ifdef ZMQ_HAVE_LINUX
+
+    public:
+        //  If receiver_ is true PGM transport is not generating SPM packets.
+        //  interface format: iface;mcast_group:port for raw PGM socket
+        //                    udp:iface;mcast_goup:port for UDP encapsulacion
+        pgm_socket_t (bool receiver_, const options_t &options_);
+
+        //  Closes the transport.
+        ~pgm_socket_t ();
+
+        //  Initialize PGM network structures (GSI, GSRs).
+        int init (const char *network_);
+
+        //  Open PGM transport. Parameters are the same as in constructor.
+        int open_transport (void);
+
+        //  Close transport.
+        void close_transport (void);
+        
+        //   Get receiver fds and store them into user allocated memory.
+        int get_receiver_fds (int *recv_fd_, int *waiting_pipe_fd_);
+
+        //   Get sender and receiver fds and store it to user allocated 
+        //   memory. Receive fd is used to process NAKs from peers.
+        int get_sender_fds (int *send_fd_, int *receive_fd_);
+
+        //  Send data as one APDU, transmit window owned memory.
+        size_t send (unsigned char *data_, size_t data_len_);
+
+        //  Allocates one slice for packet in tx window.
+        void *get_buffer (size_t *size_);
+
+        //  Fees memory allocated by get_buffer.
+        void free_buffer (void *data_);
+
+        //  Receive data from pgm socket.
+        ssize_t receive (void **data_);
+
+        //  POLLIN on sender side should mean NAK or SPMR receiving. 
+        //  process_upstream function is used to handle such a situation.
+        void process_upstream (void);
+
+    protected:
+    
+        //  OpenPGM transport
+        pgm_transport_t* g_transport;
+
+    private:
+        
+        //  Associated socket options.
+        options_t options;
+
+        //  Returns max tsdu size without fragmentation.
+        size_t get_max_tsdu_size (void);
+
+        //  Returns maximum count of apdus which fills readbuf_size_
+        size_t get_max_apdu_at_once (size_t readbuf_size_);
+
+        //  Return true if TSI has empty GSI ('\0') and sport 0.
+        bool tsi_empty (const pgm_tsi_t *tsi_);
+
+        //  Compare TSIs, return true if equal.
+        bool tsi_equal (const pgm_tsi_t *tsi_a_, const pgm_tsi_t *tsi_b_);
+        
+        //  true when pgm_socket should create receiving side.
+        bool receiver;
+
+        //  TIBCO Rendezvous format network info.
+        char network [256];
+
+        //  PGM transport port number.
+        uint16_t port_number;
+
+        //  If we are using UDP encapsulation.
+        bool udp_encapsulation;
+
+        //  Array of pgm_msgv_t structures to store received data 
+        //  from the socket (pgm_transport_recvmsgv).
+        pgm_msgv_t *pgm_msgv;
+
+        // How many bytes were read from pgm socket.
+        ssize_t nbytes_rec;
+
+        //  How many bytes were processed from last pgm socket read.
+        ssize_t nbytes_processed;
+        
+        //  How many messages from pgm_msgv were already sent up.
+        ssize_t pgm_msgv_processed;
+
+        //  Size of pgm_msgv array.
+        ssize_t pgm_msgv_len;
+
+        //  Sender transport uses 2 fd.
+        enum {pgm_sender_fd_count = 2};
+    
+        //  Receiver transport uses 2 fd.
+        enum {pgm_receiver_fd_count = 2};
+
+        //  TSI of the actual peer.
+        pgm_tsi_t tsi;
+
+        //  Previous peer TSI.
+        pgm_tsi_t retired_tsi;
+
+#endif
+    };
+}
+#endif
+
+#endif