added OpenPGM sender - ZMQ_PUB

12 files changed, 1355 insertions, 19 deletions

diff --git a/src/Makefile.am b/src/Makefile.am
index 68b34fa..f4f338e 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -62,6 +62,8 @@ libzmq_la_SOURCES = $(pgm_sources) \
     object.hpp \
     options.hpp \
     owned.hpp \
+    pgm_sender.hpp \
+    pgm_socket.hpp \
     pipe.hpp \
     platform.hpp \
     poll.hpp \
@@ -101,6 +103,8 @@ libzmq_la_SOURCES = $(pgm_sources) \
     object.cpp \
     options.cpp \
     owned.cpp \
+    pgm_sender.cpp \
+    pgm_socket.cpp \
     pipe.cpp \
     poll.cpp \
     select.cpp \
@@ -122,7 +126,7 @@ libzmq_la_SOURCES = $(pgm_sources) \
     zmq_listener.cpp \
     zmq_listener_init.cpp
 
-libzmq_la_LDFLAGS = -version-info @LTVER@
+libzmq_la_LDFLAGS = -version-info @LTVER@ @LIBZMQ_EXTRA_LDFLAFS@
 
 if BUILD_PGM
 libzmq_la_CXXFLAGS = -I$(top_srcdir)/foreign/openpgm/@pgm_basename@/openpgm/pgm/include/ -Wall @LIBZMQ_EXTRA_CXXFLAGS@
diff --git a/src/app_thread.cpp b/src/app_thread.cpp
index 2bcc724..517b721 100644
--- a/src/app_thread.cpp
+++ b/src/app_thread.cpp
@@ -145,7 +145,7 @@ zmq::socket_base_t *zmq::app_thread_t::create_socket (int type_)
     case ZMQ_PUB:
     case ZMQ_REQ:
     case ZMQ_REP:
-        s = new socket_base_t (this);
+        s = new socket_base_t (this, type_);
         break;
     default:
         //  TODO: This should be EINVAL.
diff --git a/src/config.hpp b/src/config.hpp
index 17e67b9..43a4513 100644
--- a/src/config.hpp
+++ b/src/config.hpp
@@ -70,8 +70,10 @@ namespace zmq
 
         //  Maximal number of non-accepted connections that can be held by
         //  TCP listener object.
-        tcp_connection_backlog = 10
+        tcp_connection_backlog = 10,
 
+        //  Maximum transport data unit size for PGM (TPDU).
+        pgm_max_tpdu = 1500
     };
 
 }
diff --git a/src/options.cpp b/src/options.cpp
index cd07c44..804cb4f 100644
--- a/src/options.cpp
+++ b/src/options.cpp
@@ -24,6 +24,8 @@ zmq::options_t::options_t () :
     lwm (0),
     swap (0),
     mask (0),
-    affinity (0)
+    affinity (0),
+    rate (0),
+    recovery_ivl (0)
 {
 }
diff --git a/src/options.hpp b/src/options.hpp
index faf21b8..9f4a264 100644
--- a/src/options.hpp
+++ b/src/options.hpp
@@ -37,6 +37,12 @@ namespace zmq
         uint64_t mask;
         uint64_t affinity;
         std::string identity;
+
+        //  Maximum tranfer rate [kb/s].
+        uint32_t rate;
+
+        //  Reliability time interval [s].
+        uint32_t recovery_ivl;
     };
 
 }
diff --git a/src/pgm_sender.cpp b/src/pgm_sender.cpp
new file mode 100644
index 0000000..60b4c3a
--- /dev/null
+++ b/src/pgm_sender.cpp
@@ -0,0 +1,224 @@
+/*
+    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/>.
+*/
+
+#include "platform.hpp"
+
+#if defined ZMQ_HAVE_OPENPGM
+
+#include <iostream>
+
+#include "io_thread.hpp"
+#include "pgm_sender.hpp"
+#include "err.hpp"
+#include "wire.hpp"
+
+//#define PGM_SENDER_DEBUG
+//#define PGM_SENDER_DEBUG_LEVEL 1
+
+// level 1 = key behaviour
+// level 2 = processing flow
+// level 4 = infos
+
+#ifndef PGM_SENDER_DEBUG
+#   define zmq_log(n, ...)  while (0)
+#else
+#   define zmq_log(n, ...)    do { if ((n) <= PGM_SENDER_DEBUG_LEVEL) \
+        { printf (__VA_ARGS__);}} while (0)
+#endif
+
+#ifdef ZMQ_HAVE_LINUX
+zmq::pgm_sender_t::pgm_sender_t (io_thread_t *parent_, 
+      const options_t &options_, const char *session_name_) :
+    io_object_t (parent_),
+    pgm_socket (false, options_),
+    options (options_),
+    session_name (session_name_),
+    inout (NULL),
+    out_buffer (NULL),
+    out_buffer_size (0),
+    write_size (0),
+    write_pos (0), 
+    first_message_offset (-1)
+{
+
+}
+
+int zmq::pgm_sender_t::init (const char *network_)
+{
+    return pgm_socket.init (network_);
+}
+
+void zmq::pgm_sender_t::plug (i_inout *inout_)
+{
+    
+    //  Alocate 2 fds for PGM socket.
+    int downlink_socket_fd;
+    int uplink_socket_fd;
+
+    encoder.set_inout (inout_);
+
+    //  Fill fds from PGM transport.
+    pgm_socket.get_sender_fds (&downlink_socket_fd, &uplink_socket_fd);
+
+    //  Add downlink_socket_fd into poller.
+    handle = add_fd (downlink_socket_fd);
+
+    //  Add uplink_socket_fd into the poller.
+    uplink_handle = add_fd (uplink_socket_fd);
+
+    //  Set POLLIN. We wont never want to stop polling for uplink = we never
+    //  want to stop porocess NAKs.
+    set_pollin (uplink_handle);
+
+    //  Set POLLOUT for downlink_socket_handle.
+    set_pollout (handle);
+
+    inout = inout_;
+
+    zmq_log (1, "plug: downlink_socket_fd %i, uplink_socket_fd %i, %s(%i)",
+        downlink_socket_fd, uplink_socket_fd, __FILE__, __LINE__);
+
+    std::cout << std::flush;
+}
+
+void zmq::pgm_sender_t::unplug ()
+{
+    rm_fd (handle);
+    rm_fd (uplink_handle);
+    encoder.set_inout (NULL);
+    inout = NULL;
+}
+
+void zmq::pgm_sender_t::revive ()
+{
+    set_pollout (handle);
+}
+
+zmq::pgm_sender_t::~pgm_sender_t ()
+{
+    if (out_buffer) {
+        pgm_socket.free_buffer (out_buffer);
+    }
+}
+
+//  In event on sender side means NAK or SPMR receiving from some peer.
+void zmq::pgm_sender_t::in_event ()
+{
+    pgm_socket.process_upstream ();
+}
+
+void zmq::pgm_sender_t::out_event ()
+{
+
+    //  POLLOUT event from send socket. If write buffer is empty, 
+    //  try to read new data from the encoder.
+    if (write_pos == write_size) {
+
+        //  Get buffer if we do not have already one.
+        if (!out_buffer) {
+            out_buffer = (unsigned char*) 
+                pgm_socket.get_buffer (&out_buffer_size);
+        }
+
+        assert (out_buffer_size > 0);
+
+        //  First two bytes /sizeof (uint16_t)/ are used to store message 
+        //  offset in following steps.
+        write_size = encoder.read (out_buffer + sizeof (uint16_t), 
+            out_buffer_size - sizeof (uint16_t), &first_message_offset);
+        write_pos = 0;
+
+        //  If there are no data to write stop polling for output.
+        if (!write_size) {
+            reset_pollout (handle);
+        } else {
+            // Addning uint16_t for offset in a case when encoder returned > 0B.
+            write_size += sizeof (uint16_t);
+        }
+    }
+
+    //  If there are any data to write, write them into the socket.
+    //  Note that all data has to written in one write_one_pkt_with_offset call.
+    if (write_pos < write_size) {
+        size_t nbytes = write_one_pkt_with_offset (out_buffer + write_pos, 
+            write_size - write_pos, (uint16_t) first_message_offset);
+
+        //  We can write all data or 0 which means rate limit reached.
+        if (write_size - write_pos != nbytes && nbytes != 0) {
+            zmq_log (1, "write_size - write_pos %i, nbytes %i, %s(%i)",
+                (int)(write_size - write_pos), (int)nbytes, __FILE__, __LINE__);
+            assert (false);
+        }
+
+        //  PGM rate limit reached nbytes is 0.
+        if (!nbytes) {
+            zmq_log (1, "pgm rate limit reached, %s(%i)\n", __FILE__, __LINE__);
+        }
+
+        //  After sending data slice is owned by tx window.
+        if (nbytes) {
+            out_buffer = NULL;
+        }
+
+        write_pos += nbytes;
+    }
+
+}
+
+/*
+void zmq::bp_pgm_sender_t::revive (pipe_t *pipe_)
+{
+    //  We have some messages in encoder.
+    if (!shutting_down) {
+                
+        //  Forward the revive command to the pipe. 
+        engine_base_t <false, true>::revive (pipe_);
+
+        //  There is at least one engine (that one which sent revive) that 
+        //  has messages ready. Try to write data to the socket, thus 
+        //  eliminating one polling for POLLOUT event.
+        //  Note that if write_size is zero it means that buffer is empty and
+        //  we can read data from encoder.
+        if (!write_size) {
+            poller->set_pollout (handle);
+            out_event (handle);
+        }
+    }
+}
+
+*/
+size_t zmq::pgm_sender_t::write_one_pkt_with_offset (unsigned char *data_, 
+    size_t size_, uint16_t offset_)
+{
+    zmq_log (1, "data_size %i, first message offset %i, %s(%i)",
+        (int) size_, offset_, __FILE__, __LINE__);
+
+    std::cout << std::flush;
+
+    //  Put offset information in the buffer.
+    put_uint16 (data_, offset_);
+   
+    //  Send data.
+    size_t nbytes = pgm_socket.send (data_, size_);
+
+    return nbytes;
+}
+#endif
+
+#endif
diff --git a/src/pgm_sender.hpp b/src/pgm_sender.hpp
new file mode 100644
index 0000000..2ad2a15
--- /dev/null
+++ b/src/pgm_sender.hpp
@@ -0,0 +1,109 @@
+/*
+    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 __ZMQ_BP_PGM_SENDER_HPP_INCLUDED__
+#define __ZMQ_BP_PGM_SENDER_HPP_INCLUDED__
+
+#include "platform.hpp"
+
+#if defined ZMQ_HAVE_OPENPGM
+
+#include <vector>
+
+#include "stdint.hpp"
+#include "io_object.hpp"
+#include "i_engine.hpp"
+#include "options.hpp"
+#include "pgm_socket.hpp"
+#include "zmq_encoder.hpp"
+
+namespace zmq
+{
+
+    class pgm_sender_t : public io_object_t, public i_engine
+    {
+
+    public:
+        pgm_sender_t (class io_thread_t *parent_, const options_t &options_, 
+            const char *session_name_);
+        ~pgm_sender_t ();
+
+        int init (const char *network_);
+
+        //  i_engine interface implementation.
+        void plug (struct i_inout *inout_);
+        void unplug ();
+        void revive ();
+
+        //  i_poll_events interface implementation.
+        void in_event ();
+        void out_event ();
+
+    private:
+
+        //  Send one APDU with first message offset information. 
+        //  Note that first 2 bytes in data_ are used to store the offset_
+        //  and thus user data has to start at data_ + sizeof (uint16_t).
+        size_t write_one_pkt_with_offset (unsigned char *data_, size_t size_,
+            uint16_t offset_);
+
+        //  Message encoder.
+        zmq_encoder_t encoder;
+
+        //  PGM socket.
+        pgm_socket_t pgm_socket;
+
+        //  Socket options.
+        options_t options;
+
+        //  Name of the session associated with the connecter.
+        std::string session_name;
+
+        //  Poll handle associated with PGM socket.
+        handle_t handle;
+        handle_t uplink_handle;
+
+        //  ?
+        i_inout *inout;
+
+        //  Output buffer from pgm_socket.
+#ifdef ZMQ_HAVE_WINDOWS
+        unsigned char out_buffer [pgm_win_max_apdu];
+#else
+        unsigned char *out_buffer;
+        
+        //  Output buffer size.
+        size_t out_buffer_size;
+#endif
+
+        size_t write_size;
+        size_t write_pos;
+
+        //  Offset of the first mesage in data chunk taken from encoder.
+        int first_message_offset;
+
+        pgm_sender_t (const pgm_sender_t&);
+        void operator = (const pgm_sender_t&);
+    };
+
+}
+
+#endif
+
+#endif
diff --git a/src/pgm_socket.cpp b/src/pgm_socket.cpp
new file mode 100644
index 0000000..5e2e764
--- /dev/null
+++ b/src/pgm_socket.cpp
@@ -0,0 +1,754 @@
+/*
+    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/>.
+*/
+
+#include "platform.hpp"
+
+#if defined ZMQ_HAVE_OPENPGM
+
+#ifdef ZMQ_HAVE_LINUX
+#include <pgm/pgm.h>
+#else 
+#include <Winsock2.h>
+#include <Wsrm.h>
+#include <ws2spi.h>
+#endif
+
+#include <string>
+#include <iostream>
+
+#include "options.hpp"
+#include "pgm_socket.hpp"
+#include "config.hpp"
+#include "err.hpp"
+
+//#define PGM_SOCKET_DEBUG
+//#define PGM_SOCKET_DEBUG_LEVEL 1
+
+// level 1 = key behaviour
+// level 2 = processing flow
+// level 4 = infos
+
+#ifndef PGM_SOCKET_DEBUG
+#   define zmq_log(n, ...)  while (0)
+#else
+#   define zmq_log(n, ...)    do { if ((n) <= PGM_SOCKET_DEBUG_LEVEL) \
+        { printf (__VA_ARGS__);}} while (0)
+#endif
+
+#ifdef ZMQ_HAVE_LINUX
+
+zmq::pgm_socket_t::pgm_socket_t (bool receiver_, const options_t &options_) :
+    g_transport (NULL),
+    options (options_),
+    receiver (receiver_),
+    port_number (0),
+    udp_encapsulation (false),
+    pgm_msgv (NULL),
+    nbytes_rec (0),
+    nbytes_processed (0),
+    pgm_msgv_processed (0),
+    pgm_msgv_len (0)
+{
+    
+}
+
+int zmq::pgm_socket_t::init (const char *network_)
+{
+    //  Check if we are encapsulating into UDP, natwork string has to 
+    //  start with udp:.
+    const char *network_ptr = network_;
+
+    if (strlen (network_) >= 4 && network_ [0] == 'u' && 
+          network_ [1] == 'd' && network_ [2] == 'p' && 
+          network_ [3] == ':') {
+    
+        //  Shift interface_ptr after ':'.
+        network_ptr += 4;
+
+        udp_encapsulation = true;
+    }
+ 
+    //  Parse port number.
+    const char *port_delim = strchr (network_ptr, ':');
+    if (!port_delim) {
+        errno = EINVAL;
+        return -1;
+    }
+
+    port_number = atoi (port_delim + 1);
+  
+    //  Store interface string.
+    if (port_delim <= network_ptr) {
+        errno = EINVAL;
+        return -1;
+    }
+
+    if (port_delim - network_ptr >= (int) sizeof (network) - 1) {
+        errno = EINVAL;
+        return -1;
+    }
+
+    memset (network, '\0', sizeof (network));
+    memcpy (network, network_ptr, port_delim - network_ptr);
+
+
+    zmq_log (1, "parsed: network  %s, port %i, udp encaps. %s, %s(%i)\n", 
+        network, port_number, udp_encapsulation ? "yes" : "no",
+        __FILE__, __LINE__);
+
+    //  Open PGM transport.
+    int rc = open_transport ();
+    if (rc != 0)
+        return -1;
+
+    //  For receiver transport preallocate pgm_msgv array.
+    //  in_batch_size configured in confing.hpp
+    if (receiver) {
+        pgm_msgv_len = get_max_apdu_at_once (in_batch_size);
+        pgm_msgv = new pgm_msgv_t [pgm_msgv_len];
+    }
+
+    return 0;
+}
+
+int zmq::pgm_socket_t::open_transport (void)
+{
+
+    zmq_log (1, "Opening PGM: network  %s, port %i, udp encaps. %s, %s(%i)\n",
+        network, port_number, udp_encapsulation ? "yes" : "no", 
+        __FILE__, __LINE__);
+
+    //  Can not open transport before destroying old one. 
+    zmq_assert (g_transport == NULL);
+
+    //  Set actual_tsi and prev_tsi to zeros.
+    memset (&tsi, '\0', sizeof (pgm_tsi_t));
+    memset (&retired_tsi, '\0', sizeof (pgm_tsi_t));
+
+    //  Zero counter used in msgrecv.
+    nbytes_rec = 0;
+    nbytes_processed = 0;
+    pgm_msgv_processed = 0;
+
+    //  Init PGM transport.
+    //  Ensure threading enabled, ensure timer enabled and find PGM protocol id.
+    //
+    //  Note that if you want to use gettimeofday and sleep for openPGM timing,
+    //  set environment variables PGM_TIMER to "GTOD" 
+    //  and PGM_SLEEP to "USLEEP".
+    int rc = pgm_init ();
+    if (rc != 0) {
+        errno = EINVAL;
+        return -1;
+    }
+
+    //  PGM transport GSI.
+    pgm_gsi_t gsi;
+ 
+    //  PGM transport GSRs.
+    struct group_source_req recv_gsr, send_gsr;
+    size_t recv_gsr_len = 1;
+
+    rc = pgm_create_md5_gsi (&gsi);
+    if (rc != 0) {
+        errno = EINVAL;
+        return -1;
+    }
+
+    //  On success, 0 is returned. On invalid arguments, -EINVAL is returned. 
+    //  If more multicast groups are found than the recv_len parameter, 
+    //  -ENOMEM is returned.
+    rc = pgm_if_parse_transport (network, AF_INET, &recv_gsr, 
+        &recv_gsr_len, &send_gsr);
+    if (rc != 0) {
+        errno = EINVAL;
+        return -1;
+    }
+
+    if (recv_gsr_len != 1) {
+        errno = ENOMEM;
+        return -1;
+    }
+
+    //  If we are using UDP encapsulation update send_gsr & recv_gsr 
+    //  structures. Note that send_gsr & recv_gsr has to be updated after 
+    //  pgm_if_parse_transport call.
+    if (udp_encapsulation) {
+
+        //  Use the same port for UDP encapsulation.
+        ((struct sockaddr_in*)&send_gsr.gsr_group)->sin_port = 
+            g_htons (port_number);
+	((struct sockaddr_in*)&recv_gsr.gsr_group)->sin_port = 
+            g_htons (port_number);
+    }
+
+    rc = pgm_transport_create (&g_transport, &gsi, 0, port_number, &recv_gsr, 
+        1, &send_gsr);
+    if (rc != 0) {
+        return -1;
+    }
+
+    //  Common parameters for receiver and sender.
+
+    //  Set maximum transport protocol data unit size (TPDU).
+    rc = pgm_transport_set_max_tpdu (g_transport, pgm_max_tpdu);
+    if (rc != 0) {
+        errno = EINVAL;
+        return -1;
+    }
+
+    //  Set maximum number of network hops to cross.
+    rc = pgm_transport_set_hops (g_transport, 16);
+    if (rc != 0) {
+        errno = EINVAL;
+        return -1;
+    }
+
+    //  Receiver transport.
+    if (receiver) {
+
+        //  Set transport->may_close_on_failure to true,
+        //  after data los recvmsgv returns -1 errno set to ECONNRESET.
+        rc = pgm_transport_set_close_on_failure (g_transport, TRUE);
+        if (rc != 0) {
+            errno = EINVAL;
+            return -1;
+        }
+
+        //  Set transport->can_send_data = FALSE.
+        //  Note that NAKs are still generated by the transport.
+        rc = pgm_transport_set_recv_only (g_transport, false);
+        if (rc != 0) {
+            errno = EINVAL;
+            return -1;
+        }
+
+        //  Set NAK transmit back-off interval [us].
+        rc = pgm_transport_set_nak_bo_ivl (g_transport, 50*1000);
+        if (rc != 0) {
+            errno = EINVAL;
+            return -1;
+        }
+
+        //  Set timeout before repeating NAK [us].
+        rc = pgm_transport_set_nak_rpt_ivl (g_transport, 200*1000);
+        if (rc != 0) {
+            errno = EINVAL;
+            return -1;
+        }
+
+        //  Set timeout for receiving RDATA.
+        rc = pgm_transport_set_nak_rdata_ivl (g_transport, 200*1000);
+        if (rc != 0) {
+            errno = EINVAL;
+            return -1;
+        }
+
+        //  Set retries for NAK without NCF/DATA (NAK_DATA_RETRIES).
+        rc = pgm_transport_set_nak_data_retries (g_transport, 5);
+        if (rc != 0) {
+            errno = EINVAL;
+            return -1;
+        }
+
+        //  Set retries for NCF after NAK (NAK_NCF_RETRIES).
+        rc = pgm_transport_set_nak_ncf_retries (g_transport, 2);
+        if (rc != 0) {
+            errno = EINVAL;
+            return -1;
+        }
+
+        //  Set timeout for removing a dead peer [us].
+        rc = pgm_transport_set_peer_expiry (g_transport, 5*8192*1000);
+        if (rc != 0) {
+            errno = EINVAL;
+            return -1;
+        }
+
+        //  Set expiration time of SPM Requests [us].
+        rc = pgm_transport_set_spmr_expiry (g_transport, 25*1000);
+        if (rc != 0) {
+            errno = EINVAL;
+            return -1;
+        }
+
+        //  Set the size of the receive window.
+        //
+        //  data rate [B/s]  (options.rate is kb/s).
+        if (options.rate <= 0) {
+            errno = EINVAL;
+            return -1;
+        }
+
+        rc = pgm_transport_set_rxw_max_rte (g_transport, 
+            options.rate * 1000 / 8);
+        if (rc != 0) {
+            errno = EINVAL;
+            return -1;
+        }
+
+        //  Recovery interval [s]. 
+        if (options.recovery_ivl <= 0) {
+            errno = EINVAL;
+            return -1;
+        }
+
+        rc = pgm_transport_set_rxw_secs (g_transport, options.recovery_ivl);
+        if (rc != 0) {
+            errno = EINVAL;
+            return -1;
+        }
+
+    //  Sender transport.
+    } else {
+
+        //  Set transport->can_recv = FALSE, waiting_pipe wont not be read.
+        rc = pgm_transport_set_send_only (g_transport, TRUE);
+        if (rc != 0) {
+            errno = EINVAL;
+            return -1;
+        }
+
+        //  Set the size of the send window.
+        //
+        //  data rate [B/s]  (options.rate is kb/s).
+        if (options.rate <= 0) {
+            errno = EINVAL;
+            return -1;
+        }
+
+        rc = pgm_transport_set_txw_max_rte (g_transport, 
+            options.rate * 1000 / 8);
+        if (rc != 0) {
+            errno = EINVAL;
+            return -1;
+        }
+
+        //  Recovery interval [s]. 
+        if (options.recovery_ivl <= 0) {
+            errno = EINVAL;
+            return -1;
+        }
+
+        rc = pgm_transport_set_txw_secs (g_transport, options.recovery_ivl);
+        if (rc != 0) {
+            errno = EINVAL;
+            return -1;
+        }
+
+        //  Preallocate full transmit window. For simplification always 
+        //  worst case is used (40 bytes ipv6 header and 20 bytes UDP 
+        //  encapsulation).
+        int to_preallocate = options.recovery_ivl * (options.rate * 1000 / 8) 
+            / (pgm_max_tpdu - 40 - 20);
+
+        rc = pgm_transport_set_txw_preallocate (g_transport, to_preallocate);
+        if (rc != 0) {
+            errno = EINVAL;
+            return -1;
+        }
+
+        zmq_log (1, "Preallocated %i slices in TX window. %s(%i)\n", 
+            to_preallocate, __FILE__, __LINE__);
+
+        //  Set interval of background SPM packets [us].
+        rc = pgm_transport_set_ambient_spm (g_transport, 8192 * 1000);
+        if (rc != 0) {
+            errno = EINVAL;
+            return -1;
+        }
+
+        //  Set intervals of data flushing SPM packets [us].
+        guint spm_heartbeat[] = {4 * 1000, 4 * 1000, 8 * 1000, 16 * 1000, 
+            32 * 1000, 64 * 1000, 128 * 1000, 256 * 1000, 512 * 1000, 
+            1024 * 1000, 2048 * 1000, 4096 * 1000, 8192 * 1000};
+        
+	rc = pgm_transport_set_heartbeat_spm (g_transport, spm_heartbeat, 
+            G_N_ELEMENTS(spm_heartbeat));
+        if (rc != 0) {
+            errno = EINVAL;
+            return -1;
+        }
+    }
+
+    //  Enable multicast loopback.
+    rc = pgm_transport_set_multicast_loop (g_transport, true);
+    if (rc != 0) {
+        errno = EINVAL;
+        return -1;
+    }
+
+    //  Bind a transport to the specified network devices.
+    rc = pgm_transport_bind (g_transport);
+    if (rc != 0) {
+        return -1;
+    }
+
+    return 0;
+}
+
+zmq::pgm_socket_t::~pgm_socket_t ()
+{
+    //  Celanup.
+    if (pgm_msgv) {
+        delete [] pgm_msgv;
+    }
+
+    if (g_transport)
+        close_transport ();
+}
+
+void zmq::pgm_socket_t::close_transport (void)
+{   
+    //  g_transport has to be valid.
+    zmq_assert (g_transport);
+
+    pgm_transport_destroy (g_transport, TRUE);
+
+    g_transport = NULL;
+}
+
+//   Get receiver fds. recv_fd is from transport->recv_sock
+//   waiting_pipe_fd is from transport->waiting_pipe [0]
+int zmq::pgm_socket_t::get_receiver_fds (int *recv_fd_, 
+    int *waiting_pipe_fd_)
+{
+
+    //  For POLLIN there are 2 pollfds in pgm_transport.
+    int fds_array_size = pgm_receiver_fd_count;
+    pollfd *fds = new pollfd [fds_array_size];
+    memset (fds, '\0', fds_array_size * sizeof (fds));
+
+    //  Retrieve pollfds from pgm_transport.
+    int rc = pgm_transport_poll_info (g_transport, fds, &fds_array_size, 
+        POLLIN);
+
+    //  pgm_transport_poll_info has to return 2 pollfds for POLLIN. 
+    //  Note that fds_array_size parameter can be 
+    //  changed inside pgm_transport_poll_info call.
+    zmq_assert (rc == pgm_receiver_fd_count);
+ 
+    //  Store pfds into user allocated space.
+    *recv_fd_ = fds [0].fd;
+    *waiting_pipe_fd_ = fds [1].fd;
+
+    delete [] fds;
+
+    return pgm_receiver_fd_count;
+}
+
+//   Get fds and store them into user allocated memory. 
+//   sender_fd is from pgm_transport->send_sock.
+//   receive_fd_ is from  transport->recv_sock.
+int zmq::pgm_socket_t::get_sender_fds (int *send_fd_, int *receive_fd_)
+{
+
+    //  Preallocate pollfds array.
+    int fds_array_size = pgm_sender_fd_count;
+    pollfd *fds = new pollfd [fds_array_size];
+    memset (fds, '\0', fds_array_size * sizeof (fds));
+
+    //  Retrieve pollfds from pgm_transport
+    int rc = pgm_transport_poll_info (g_transport, fds, &fds_array_size, 
+        POLLOUT | POLLIN);
+
+    //  pgm_transport_poll_info has to return one pollfds for POLLOUT and
+    //  second for POLLIN.
+    //  Note that fds_array_size parameter can be 
+    //  changed inside pgm_transport_poll_info call.
+    zmq_assert (rc == pgm_sender_fd_count);
+ 
+    //  Store pfds into user allocated space.
+    *receive_fd_ = fds [0].fd;
+    *send_fd_ = fds [1].fd;
+
+    delete [] fds;
+
+    return pgm_sender_fd_count;
+}
+
+//  Send one APDU, transmit window owned memory.
+size_t zmq::pgm_socket_t::send (unsigned char *data_, size_t data_len_)
+{
+    iovec iov = {data_,data_len_};
+
+    ssize_t nbytes = pgm_transport_send_packetv (g_transport, &iov, 1, 
+        MSG_DONTWAIT | MSG_WAITALL, true);
+
+    zmq_assert (nbytes != -EINVAL);
+
+    if (nbytes == -1 && errno != EAGAIN) {
+        errno_assert (false);
+    }
+
+    //  If nbytes is -1 and errno is EAGAIN means that we can not send data 
+    //  now. We have to call write_one_pkt again.
+    nbytes = nbytes == -1 ? 0 : nbytes;
+
+    zmq_log (4, "wrote %iB, %s(%i)\n", (int)nbytes, __FILE__, __LINE__);
+    
+    // We have to write all data as one packet.
+    if (nbytes > 0) {
+        zmq_assert (nbytes == (ssize_t)data_len_);
+    }
+
+    return nbytes;
+}
+
+//  Return max TSDU size without fragmentation from current PGM transport.
+size_t zmq::pgm_socket_t::get_max_tsdu_size (void)
+{
+    return (size_t)pgm_transport_max_tsdu (g_transport, false);
+}
+
+//  Returns how many APDUs are needed to fill reading buffer.
+size_t zmq::pgm_socket_t::get_max_apdu_at_once (size_t readbuf_size_)
+{
+    zmq_assert (readbuf_size_ > 0);
+
+    //  Read max TSDU size without fragmentation.
+    size_t max_tsdu_size = get_max_tsdu_size ();
+
+    //  Calculate number of APDUs needed to fill the reading buffer.
+    size_t apdu_count = (int)readbuf_size_ / max_tsdu_size;
+
+    if ((int) readbuf_size_ % max_tsdu_size)
+        apdu_count ++;
+
+    //  Have to have at least one APDU.
+    zmq_assert (apdu_count);
+
+    return apdu_count;
+}
+
+//  Allocate buffer for one packet from the transmit window, The memory buffer 
+//  is owned by the transmit window and so must be returned to the window with 
+//  content via pgm_transport_send() calls or unused with pgm_packetv_free1(). 
+void *zmq::pgm_socket_t::get_buffer (size_t *size_)
+{
+    //  Store size.
+    *size_ = get_max_tsdu_size ();
+
+    //  Allocate one packet.
+    return pgm_packetv_alloc (g_transport, false);
+}
+
+//  Return an unused packet allocated from the transmit window 
+//  via pgm_packetv_alloc(). 
+void zmq::pgm_socket_t::free_buffer (void *data_)
+{
+    pgm_packetv_free1 (g_transport, data_, false);
+}
+
+//  pgm_transport_recvmsgv is called to fill the pgm_msgv array up to 
+//  pgm_msgv_len. In subsequent calls data from pgm_msgv structure are 
+//  returned.
+ssize_t zmq::pgm_socket_t::receive (void **raw_data_)
+{
+ 
+    //  We just sent all data from pgm_transport_recvmsgv up 
+    //  and have to return 0 that another engine in this thread is scheduled.
+    if (nbytes_rec == nbytes_processed && nbytes_rec > 0) {
+
+        //  Reset all the counters.
+        nbytes_rec = 0;
+        nbytes_processed = 0;
+        pgm_msgv_processed = 0;
+
+        return 0;
+    }
+
+    //  If we have are going first time or if we have processed all pgm_msgv_t
+    //  structure previaously read from the pgm socket.
+    if (nbytes_rec == nbytes_processed) {
+
+        //  Check program flow.
+        zmq_assert (pgm_msgv_processed == 0);
+        zmq_assert (nbytes_processed == 0);
+        zmq_assert (nbytes_rec == 0);
+
+        //  Receive a vector of Application Protocol Domain Unit's (APDUs) 
+        //  from the transport.
+        nbytes_rec = pgm_transport_recvmsgv (g_transport, pgm_msgv, 
+            pgm_msgv_len, MSG_DONTWAIT);
+  
+        //  In a case when no ODATA/RDATA fired POLLIN event (SPM...)
+        //  pgm_transport_recvmsg returns -1 with errno == EAGAIN.
+        if (nbytes_rec == -1 && errno == EAGAIN) {
+        
+            //  In case if no RDATA/ODATA caused POLLIN 0 is 
+            //  returned.
+            nbytes_rec = 0;
+            return 0;
+        }
+
+        //  For data loss nbytes_rec == -1 errno == ECONNRESET.
+        if (nbytes_rec == -1 && errno == ECONNRESET) {
+            
+            //  In case of dala loss -1 is returned.
+            zmq_log (1, "Data loss detected, %s(%i)\n", __FILE__, __LINE__);
+            nbytes_rec = 0;
+            return -1;
+        }
+
+        //  Catch the rest of the errors.
+        if (nbytes_rec <= 0) {
+            zmq_log (1, "received %i B, errno %i, %s(%i)", (int)nbytes_rec, 
+                errno, __FILE__, __LINE__);
+            errno_assert (nbytes_rec > 0);
+        }
+   
+        zmq_log (4, "received %i bytes\n", (int)nbytes_rec);
+    }
+
+    zmq_assert (nbytes_rec > 0);
+
+    // Only one APDU per pgm_msgv_t structure is allowed. 
+    zmq_assert (pgm_msgv [pgm_msgv_processed].msgv_iovlen == 1);
+
+    //  Take pointers from pgm_msgv_t structure.
+    *raw_data_ = pgm_msgv[pgm_msgv_processed].msgv_iov->iov_base;
+    size_t raw_data_len = pgm_msgv[pgm_msgv_processed].msgv_iov->iov_len;
+
+    //  Check if peer TSI did not change, this is detection of peer restart.
+    const pgm_tsi_t *current_tsi = pgm_msgv [pgm_msgv_processed].msgv_tsi;
+
+    //  If empty store new TSI.
+    if (tsi_empty (&tsi)) {
+        //  Store current peer TSI.
+        memcpy (&tsi, current_tsi, sizeof (pgm_tsi_t));
+#ifdef PGM_SOCKET_DEBUG
+        uint8_t *gsi = (uint8_t*)(&tsi)->gsi.identifier;
+#endif
+
+        zmq_log (1, "First peer TSI: %i.%i.%i.%i.%i.%i.%i, %s(%i)\n",
+            gsi [0], gsi [1], gsi [2], gsi [3], gsi [4], gsi [5], 
+            ntohs (tsi.sport), __FILE__, __LINE__);
+    }
+
+    //  Compare stored TSI with actual.
+    if (!tsi_equal (&tsi, current_tsi)) {
+        //  Peer change detected.
+        zmq_log (1, "Peer change detected, %s(%i)\n", __FILE__, __LINE__);
+        
+        //  Compare with retired TSI, in case of match ignore APDU.
+        if (tsi_equal (&retired_tsi, current_tsi)) {
+            zmq_log (1, "Retired TSI - ignoring APDU, %s(%i)\n", 
+                __FILE__, __LINE__); 
+            
+            //  Move the the next pgm_msgv_t structure.
+            pgm_msgv_processed++;
+            nbytes_processed +=raw_data_len;
+            
+            return 0;
+
+        } else {
+            zmq_log (1, "New TSI, %s(%i)\n", __FILE__, __LINE__); 
+
+            //  Store new TSI and move last valid to retired_tsi
+            memcpy (&retired_tsi, &tsi, sizeof (pgm_tsi_t));
+            memcpy (&tsi, current_tsi, sizeof (pgm_tsi_t));
+
+#ifdef PGM_SOCKET_DEBUG
+            uint8_t *gsi = (uint8_t*)(&retired_tsi)->gsi.identifier;
+#endif
+            zmq_log (1, "retired TSI: %i.%i.%i.%i.%i.%i.%i, %s(%i)\n",
+                gsi [0], gsi [1], gsi [2], gsi [3], gsi [4], gsi [5], 
+                ntohs (retired_tsi.sport), __FILE__, __LINE__);
+
+#ifdef PGM_SOCKET_DEBUG
+            gsi = (uint8_t*)(&tsi)->gsi.identifier;
+#endif
+            zmq_log (1, "        TSI: %i.%i.%i.%i.%i.%i.%i, %s(%i)\n",
+                gsi [0], gsi [1], gsi [2], gsi [3], gsi [4], gsi [5], 
+                ntohs (tsi.sport), __FILE__, __LINE__);
+
+            //  Peers change is recognized as a GAP.
+            return -1;
+        }
+
+    }
+        
+    //  Move the the next pgm_msgv_t structure.
+    pgm_msgv_processed++;
+    nbytes_processed +=raw_data_len;
+
+    zmq_log (4, "sendig up %i bytes\n", (int)raw_data_len);
+
+    return raw_data_len;
+}
+
+void zmq::pgm_socket_t::process_upstream (void)
+{
+    zmq_log (1, "On upstream packet, %s(%i)\n", __FILE__, __LINE__);
+    //  We acctually do not want to read any data here we are going to 
+    //  process NAK.
+    pgm_msgv_t dummy_msg;
+
+    ssize_t dummy_bytes = pgm_transport_recvmsgv (g_transport, &dummy_msg,
+        1, MSG_DONTWAIT);
+    
+    //  No data should be returned.
+    zmq_assert (dummy_bytes == -1 && errno == EAGAIN);
+}
+
+bool zmq::pgm_socket_t::tsi_equal (const pgm_tsi_t *tsi_a_, 
+    const pgm_tsi_t *tsi_b_)
+{
+    //  Compare 6B GSI.
+    const uint8_t *gsi_a = tsi_a_->gsi.identifier;
+    const uint8_t *gsi_b = tsi_b_->gsi.identifier;
+
+    if (gsi_a [0] != gsi_b [0] || gsi_a [1] != gsi_b [1] || 
+          gsi_a [2] != gsi_b [2] || gsi_a [3] != gsi_b [3] ||
+          gsi_a [4] != gsi_b [4] || gsi_a [5] != gsi_b [5]) {
+
+        return false;
+    }
+
+    //  Compare source port.
+    if (tsi_a_->sport != tsi_b_->sport) {
+        return false;
+    }
+
+    return true;
+}
+
+bool zmq::pgm_socket_t::tsi_empty (const pgm_tsi_t *tsi_)
+{
+
+    uint8_t *gsi = (uint8_t*)tsi_->gsi.identifier;
+
+    //  GSI.
+    if (gsi [0] != 0 || gsi [1] != 0 || gsi [2] != 0 || 
+         gsi [3] != 0 || gsi [4] != 0 || gsi [5] != 0) {
+        return false;
+    }
+
+    //  Source port.
+    if (tsi_->sport != 0) {
+        return false;
+    }
+
+    return true;
+}
+
+#endif
+
+#endif
diff --git a/src/pgm_socket.hpp b/src/pgm_socket.hpp
new file mode 100644
index 0000000..632288d
--- /dev/null
+++ b/src/pgm_socket.hpp
@@ -0,0 +1,153 @@
+/*
+    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
diff --git a/src/socket_base.cpp b/src/socket_base.cpp
index b4f7d6b..9412d67 100644
--- a/src/socket_base.cpp
+++ b/src/socket_base.cpp
@@ -17,6 +17,8 @@
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
+#include <iostream>
+
 #include <string>
 #include <algorithm>
 
@@ -35,9 +37,12 @@
 #include "uuid.hpp"
 #include "pipe.hpp"
 #include "err.hpp"
+#include "platform.hpp"
+#include "pgm_sender.hpp"
 
-zmq::socket_base_t::socket_base_t (app_thread_t *parent_) :
+zmq::socket_base_t::socket_base_t (app_thread_t *parent_, int type_) :
     object_t (parent_),
+    type (type_),
     current (0),
     active (0),
     pending_term_acks (0),
@@ -145,6 +150,22 @@ int zmq::socket_base_t::setsockopt (int option_, const void *optval_,
         errno = EFAULT;
         return -1;
 
+    case ZMQ_RATE:
+        if (optvallen_ != sizeof (uint32_t)) {
+            errno = EINVAL;
+            return -1;
+        }
+        options.rate = *((int32_t*) optval_);
+        return 0;
+        
+    case ZMQ_RECOVERY_IVL:
+        if (optvallen_ != sizeof (uint32_t)) {
+            errno = EINVAL;
+            return -1;
+        }
+        options.recovery_ivl = *((int32_t*) optval_);
+        return 0;
+
     default:
         errno = EINVAL;
         return -1;
@@ -170,6 +191,21 @@ int zmq::socket_base_t::connect (const char *addr_)
     std::string session_name ("#");
     session_name += uuid_t ().to_string ();
 
+    //  Parse addr_ string.
+    std::string addr_type;
+    std::string addr_args;
+
+    std::string addr (addr_);
+    std::string::size_type pos = addr.find ("://");
+
+    if (pos == std::string::npos) {
+        errno = EINVAL;
+        return -1;
+    }
+
+    addr_type = addr.substr (0, pos);
+    addr_args = addr.substr (pos + 3);
+
     //  Create the session.
     io_thread_t *io_thread = choose_io_thread (options.affinity);
     session_t *session = new session_t (io_thread, this, session_name.c_str (),
@@ -198,20 +234,63 @@ int zmq::socket_base_t::connect (const char *addr_)
     send_plug (session);
     send_own (this, session);
 
-    //  Create the connecter object. Supply it with the session name so that
-    //  it can bind the new connection to the session once it is established.
-    zmq_connecter_t *connecter = new zmq_connecter_t (
-        choose_io_thread (options.affinity), this, options,
-        session_name.c_str ());
-    int rc = connecter->set_address (addr_);
-    if (rc != 0) {
-        delete connecter;
-        return -1;
+    if (addr_type == "tcp") {
+
+        //  Create the connecter object. Supply it with the session name so that
+        //  it can bind the new connection to the session once it is established.
+        zmq_connecter_t *connecter = new zmq_connecter_t (
+            choose_io_thread (options.affinity), this, options,
+            session_name.c_str ());
+        int rc = connecter->set_address (addr_args.c_str ());
+        if (rc != 0) {
+            delete connecter;
+            return -1;
+        }
+        send_plug (connecter);
+        send_own (this, connecter);
+
+        return 0;
     }
-    send_plug (connecter);
-    send_own (this, connecter);
 
-    return 0;
+#if defined ZMQ_HAVE_OPENPGM
+    if (addr_type == "pgm") {
+        
+        switch (type) {
+        case ZMQ_PUB:
+        {
+            pgm_sender_t *pgm_sender = 
+                new pgm_sender_t (choose_io_thread (options.affinity), options, 
+                session_name.c_str ());
+
+            int rc = pgm_sender->init (addr_args.c_str ());
+            if (rc != 0) {
+                delete pgm_sender;
+                return -1;
+            }
+    
+            //  Reserve a sequence number for following 'attach' command.
+            session->inc_seqnum ();
+            send_attach (session, pgm_sender);
+
+            pgm_sender = NULL;
+
+            break;
+        }
+        case ZMQ_SUB:
+            zmq_assert (false);
+            break;
+        default:
+            errno = EINVAL;
+            return -1;
+        }
+
+        return 0;
+    }
+#endif
+
+    //  Unknown address type.
+    errno = ENOTSUP;
+    return -1;
 }
 
 int zmq::socket_base_t::send (::zmq_msg_t *msg_, int flags_)
diff --git a/src/socket_base.hpp b/src/socket_base.hpp
index 5711dbe..398cd32 100644
--- a/src/socket_base.hpp
+++ b/src/socket_base.hpp
@@ -38,7 +38,7 @@ namespace zmq
     {
     public:
 
-        socket_base_t (class app_thread_t *parent_);
+        socket_base_t (class app_thread_t *parent_, int type_);
         virtual ~socket_base_t ();
 
         //  Interface for communication with the API layer.
@@ -87,6 +87,9 @@ namespace zmq
         //  fair queueing.
         bool fetch (struct zmq_msg_t *msg_);
 
+        //  Type of the socket.
+        int type;
+
         //  List of all I/O objects owned by this socket. The socket is
         //  responsible for deallocating them before it quits.
         typedef std::set <class owned_t*> io_objects_t;
diff --git a/src/sub.cpp b/src/sub.cpp
index 8c1ef9b..1503fe2 100644
--- a/src/sub.cpp
+++ b/src/sub.cpp
@@ -23,7 +23,7 @@
 #include "err.hpp"
 
 zmq::sub_t::sub_t (class app_thread_t *parent_) :
-    socket_base_t (parent_),
+    socket_base_t (parent_, ZMQ_SUB),
     all_count (0)
 {
 }