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diff --git a/src/signaler.cpp b/src/signaler.cpp
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+/*
+ Copyright (c) 2007-2010 iMatix Corporation
+
+ 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 "signaler.hpp"
+#include "platform.hpp"
+#include "err.hpp"
+#include "fd.hpp"
+#include "ip.hpp"
+
+#if defined ZMQ_HAVE_OPENVMS
+#include <netinet/tcp.h>
+#include <unistd.h>
+#elif defined ZMQ_HAVE_WINDOWS
+#include "windows.hpp"
+#else
+#include <unistd.h>
+#include <fcntl.h>
+#include <limits.h>
+#endif
+
+zmq::fd_t zmq::signaler_t::get_fd ()
+{
+ return r;
+}
+
+#if defined ZMQ_HAVE_WINDOWS
+
+zmq::signaler_t::signaler_t ()
+{
+ // Windows have no 'socketpair' function. CreatePipe is no good as pipe
+ // handles cannot be polled on. Here we create the socketpair by hand.
+
+ struct sockaddr_in addr;
+ SOCKET listener;
+ int addrlen = sizeof (addr);
+
+ w = INVALID_SOCKET;
+ r = INVALID_SOCKET;
+
+ fd_t rcs = (listener = socket (AF_INET, SOCK_STREAM, 0));
+ wsa_assert (rcs != INVALID_SOCKET);
+
+ memset (&addr, 0, sizeof (addr));
+ addr.sin_family = AF_INET;
+ addr.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
+ addr.sin_port = 0;
+
+ int rc = bind (listener, (const struct sockaddr*) &addr, sizeof (addr));
+ wsa_assert (rc != SOCKET_ERROR);
+
+ rc = getsockname (listener, (struct sockaddr*) &addr, &addrlen);
+ wsa_assert (rc != SOCKET_ERROR);
+
+ // Listen for incomming connections.
+ rc = listen (listener, 1);
+ wsa_assert (rc != SOCKET_ERROR);
+
+ // Create the socket.
+ w = WSASocket (AF_INET, SOCK_STREAM, 0, NULL, 0, 0);
+ wsa_assert (w != INVALID_SOCKET);
+
+ // Connect to the remote peer.
+ rc = connect (w, (sockaddr *) &addr, sizeof (addr));
+ wsa_assert (rc != SOCKET_ERROR);
+
+ // Accept connection from w.
+ r = accept (listener, NULL, NULL);
+ wsa_assert (r != INVALID_SOCKET);
+
+ // Set the read site of the pair to non-blocking mode.
+ unsigned long argp = 1;
+ rc = ioctlsocket (r, FIONBIO, &argp);
+ wsa_assert (rc != SOCKET_ERROR);
+
+ // We don't need the listening socket anymore. Close it.
+ rc = closesocket (listener);
+ wsa_assert (rc != SOCKET_ERROR);
+}
+
+zmq::signaler_t::~signaler_t ()
+{
+ int rc = closesocket (w);
+ wsa_assert (rc != SOCKET_ERROR);
+
+ rc = closesocket (r);
+ wsa_assert (rc != SOCKET_ERROR);
+}
+
+void zmq::signaler_t::send (const command_t &cmd_)
+{
+ // TODO: Note that send is a blocking operation.
+ // How should we behave if the signal cannot be written to the signaler?
+ // Even worse: What if half of a command is written?
+ int rc = ::send (w, (char*) &cmd_, sizeof (command_t), 0);
+ win_assert (rc != SOCKET_ERROR);
+ zmq_assert (rc == sizeof (command_t));
+}
+
+bool zmq::signaler_t::recv (command_t *cmd_, bool block_)
+{
+ if (block_) {
+
+ // Switch to blocking mode.
+ unsigned long argp = 0;
+ int rc = ioctlsocket (r, FIONBIO, &argp);
+ wsa_assert (rc != SOCKET_ERROR);
+ }
+
+ bool result;
+ int nbytes = ::recv (r, (char*) cmd_, sizeof (command_t), 0);
+ if (nbytes == -1 && WSAGetLastError () == WSAEWOULDBLOCK) {
+ result = false;
+ }
+ else {
+ wsa_assert (nbytes != -1);
+
+ // Check whether we haven't got half of a signal.
+ zmq_assert (nbytes % sizeof (uint32_t) == 0);
+
+ result = true;
+ }
+
+ if (block_) {
+
+ // Switch back to non-blocking mode.
+ unsigned long argp = 1;
+ int rc = ioctlsocket (r, FIONBIO, &argp);
+ wsa_assert (rc != SOCKET_ERROR);
+ }
+
+ return result;
+}
+
+#elif defined ZMQ_HAVE_HPUX || defined ZMQ_HAVE_AIX
+
+#include <sys/types.h>
+#include <sys/socket.h>
+
+zmq::signaler_t::signaler_t ()
+{
+ int sv [2];
+ int rc = socketpair (AF_UNIX, SOCK_STREAM, 0, sv);
+ errno_assert (rc == 0);
+ w = sv [0];
+ r = sv [1];
+
+ // Set the reader to non-blocking mode.
+ int flags = fcntl (r, F_GETFL, 0);
+ if (flags == -1)
+ flags = 0;
+ rc = fcntl (r, F_SETFL, flags | O_NONBLOCK);
+ errno_assert (rc != -1);
+}
+
+zmq::signaler_t::~signaler_t ()
+{
+ close (w);
+ close (r);
+}
+
+void zmq::signaler_t::send (const command_t &cmd_)
+{
+ ssize_t nbytes = send (w, &cmd_, sizeof (command_t), 0);
+ errno_assert (nbytes != -1);
+ zmq_assert (nbytes == sizeof (command_t));
+}
+
+bool zmq::signaler_t::recv (command_t &cmd_, bool block_)
+{
+ if (block_) {
+
+ // Set the reader to blocking mode.
+ int flags = fcntl (r, F_GETFL, 0);
+ if (flags == -1)
+ flags = 0;
+ int rc = fcntl (r, F_SETFL, flags & ~O_NONBLOCK);
+ errno_assert (rc != -1);
+ }
+
+ bool result;
+ ssize_t nbytes = recv (r, buffer, sizeof (command_t), 0);
+ if (nbytes == -1 && errno == EAGAIN) {
+ result = false;
+ }
+ else {
+ zmq_assert (nbytes != -1);
+
+ // Check whether we haven't got half of command.
+ zmq_assert (nbytes == sizeof (command_t));
+
+ result = true;
+ }
+
+ if (block_)
+
+ // Set the reader to non-blocking mode.
+ int flags = fcntl (r, F_GETFL, 0);
+ if (flags == -1)
+ flags = 0;
+ int rc = fcntl (r, F_SETFL, flags | O_NONBLOCK);
+ errno_assert (rc != -1);
+ }
+
+ return result;
+}
+
+#else
+
+#include <sys/types.h>
+#include <sys/socket.h>
+
+zmq::signaler_t::signaler_t ()
+{
+ // Make sure that command can be written to the socket in atomic fashion.
+ // If this wasn't guaranteed, commands from different threads would be
+ // interleaved.
+ zmq_assert (sizeof (command_t) <= PIPE_BUF);
+
+ int sv [2];
+ int rc = socketpair (AF_UNIX, SOCK_STREAM, 0, sv);
+ errno_assert (rc == 0);
+ w = sv [0];
+ r = sv [1];
+}
+
+zmq::signaler_t::~signaler_t ()
+{
+ close (w);
+ close (r);
+}
+
+void zmq::signaler_t::send (const command_t &cmd_)
+{
+ // TODO: Note that send is a blocking operation.
+ // How should we behave if the command cannot be written to the signaler?
+ ssize_t nbytes = ::send (w, &cmd_, sizeof (command_t), 0);
+ errno_assert (nbytes != -1);
+
+ // This should never happen as we've already checked that command size is
+ // less than PIPE_BUF.
+ zmq_assert (nbytes == sizeof (command_t));
+}
+
+bool zmq::signaler_t::recv (command_t *cmd_, bool block_)
+{
+ ssize_t nbytes = ::recv (r, cmd_, sizeof (command_t),
+ block_ ? 0 : MSG_DONTWAIT);
+
+ // If there's no signal available return false.
+ if (nbytes == -1 && errno == EAGAIN)
+ return false;
+
+ errno_assert (nbytes != -1);
+
+ // Check whether we haven't got half of command.
+ zmq_assert (nbytes == sizeof (command_t));
+
+ return true;
+}
+
+#endif
+
+#if defined ZMQ_HAVE_OPENVMS
+
+int zmq::signaler_t::socketpair (int domain_, int type_, int protocol_,
+ int sv_ [2])
+{
+ int listener;
+ sockaddr_in lcladdr;
+ socklen_t lcladdr_len;
+ int rc;
+ int on = 1;
+
+ zmq_assert (type_ == SOCK_STREAM);
+
+ // Fill in the localhost address (127.0.0.1).
+ memset (&lcladdr, 0, sizeof (lcladdr));
+ lcladdr.sin_family = AF_INET;
+ lcladdr.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
+ lcladdr.sin_port = 0;
+
+ listener = socket (AF_INET, SOCK_STREAM, 0);
+ errno_assert (listener != -1);
+
+ rc = setsockopt (listener, IPPROTO_TCP, TCP_NODELAY, &on, sizeof (on));
+ errno_assert (rc != -1);
+
+ rc = setsockopt (listener, IPPROTO_TCP, TCP_NODELACK, &on, sizeof (on));
+ errno_assert (rc != -1);
+
+ rc = bind(listener, (struct sockaddr*) &lcladdr, sizeof (lcladdr));
+ errno_assert (rc != -1);
+
+ lcladdr_len = sizeof (lcladdr);
+
+ rc = getsockname (listener, (struct sockaddr*) &lcladdr, &lcladdr_len);
+ errno_assert (rc != -1);
+
+ rc = listen (listener, 1);
+ errno_assert (rc != -1);
+
+ sv_ [0] = socket (AF_INET, SOCK_STREAM, 0);
+ errno_assert (rc != -1);
+
+ rc = setsockopt (sv_ [0], IPPROTO_TCP, TCP_NODELAY, &on, sizeof (on));
+ errno_assert (rc != -1);
+
+ rc = setsockopt (sv_ [0], IPPROTO_TCP, TCP_NODELACK, &on, sizeof (on));
+ errno_assert (rc != -1);
+
+ rc = connect (sv_ [0], (struct sockaddr*) &lcladdr, sizeof (lcladdr));
+ errno_assert (rc != -1);
+
+ sv_ [1] = accept (listener, NULL, NULL);
+ errno_assert (sv_ [1] != -1);
+
+ close (listener);
+
+ return 0;
+}
+
+#endif
+
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