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+/*
+ Copyright (c) 2007-2011 iMatix Corporation
+ Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
+
+ This file is part of 0MQ.
+
+ 0MQ is free software; you can redistribute it and/or modify it under
+ the terms of the GNU Lesser 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
+ GNU Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "platform.hpp"
+
+#if defined ZMQ_FORCE_SELECT
+#define ZMQ_SIGNALER_WAIT_BASED_ON_SELECT
+#elif defined ZMQ_FORCE_POLL
+#define ZMQ_SIGNALER_WAIT_BASED_ON_POLL
+#elif defined ZMQ_HAVE_LINUX || defined ZMQ_HAVE_FREEBSD ||\
+ defined ZMQ_HAVE_OPENBSD || defined ZMQ_HAVE_SOLARIS ||\
+ defined ZMQ_HAVE_OSX || defined ZMQ_HAVE_QNXNTO ||\
+ defined ZMQ_HAVE_HPUX || defined ZMQ_HAVE_AIX ||\
+ defined ZMQ_HAVE_NETBSD
+#define ZMQ_SIGNALER_WAIT_BASED_ON_POLL
+#elif defined ZMQ_HAVE_WINDOWS || defined ZMQ_HAVE_OPENVMS
+#define ZMQ_SIGNALER_WAIT_BASED_ON_SELECT
+#endif
+
+// On AIX, poll.h has to be included before zmq.h to get consistent
+// definition of pollfd structure (AIX uses 'reqevents' and 'retnevents'
+// instead of 'events' and 'revents' and defines macros to map from POSIX-y
+// names to AIX-specific names).
+#if defined ZMQ_SIGNALER_WAIT_BASED_ON_POLL
+#include <poll.h>
+#elif defined ZMQ_SIGNALER_WAIT_BASED_ON_SELECT
+#if defined ZMQ_HAVE_WINDOWS
+#include "windows.hpp"
+#elif defined ZMQ_HAVE_HPUX
+#include <sys/param.h>
+#include <sys/types.h>
+#include <sys/time.h>
+#elif defined ZMQ_HAVE_OPENVMS
+#include <sys/types.h>
+#include <sys/time.h>
+#else
+#include <sys/select.h>
+#endif
+#endif
+
+#include "signaler.hpp"
+#include "likely.hpp"
+#include "err.hpp"
+#include "fd.hpp"
+#include "ip.hpp"
+
+#if defined ZMQ_HAVE_WINDOWS
+#include "windows.hpp"
+#else
+#include <unistd.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <netinet/tcp.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#endif
+
+zmq::signaler_t::signaler_t ()
+{
+ // Create the socketpair for signaling.
+ int rc = make_fdpair (&r, &w);
+ errno_assert (rc == 0);
+
+ // Set both fds to non-blocking mode.
+#if defined ZMQ_HAVE_WINDOWS
+ unsigned long argp = 1;
+ rc = ioctlsocket (w, FIONBIO, &argp);
+ wsa_assert (rc != SOCKET_ERROR);
+ rc = ioctlsocket (r, FIONBIO, &argp);
+ wsa_assert (rc != SOCKET_ERROR);
+#else
+ int flags = fcntl (w, F_GETFL, 0);
+ errno_assert (flags >= 0);
+ rc = fcntl (w, F_SETFL, flags | O_NONBLOCK);
+ errno_assert (rc == 0);
+ flags = fcntl (r, F_GETFL, 0);
+ errno_assert (flags >= 0);
+ rc = fcntl (r, F_SETFL, flags | O_NONBLOCK);
+ errno_assert (rc == 0);
+#endif
+}
+
+zmq::signaler_t::~signaler_t ()
+{
+#if defined ZMQ_HAVE_WINDOWS
+ int rc = closesocket (w);
+ wsa_assert (rc != SOCKET_ERROR);
+ rc = closesocket (r);
+ wsa_assert (rc != SOCKET_ERROR);
+#else
+ close (w);
+ close (r);
+#endif
+}
+
+zmq::fd_t zmq::signaler_t::get_fd ()
+{
+ return r;
+}
+
+void zmq::signaler_t::send ()
+{
+#if defined ZMQ_HAVE_WINDOWS
+ unsigned char dummy = 0;
+ int nbytes = ::send (w, &dummy, sizeof (dummy), 0);
+ wsa_assert (nbytes != SOCKET_ERROR);
+ zmq_assert (nbytes == sizeof (dummy));
+#else
+ unsigned char dummy = 0;
+ while (true) {
+ ssize_t nbytes = ::send (w, &dummy, sizeof (dummy), 0);
+ if (unlikely (nbytes == -1 && errno == EINTR))
+ continue;
+ zmq_assert (nbytes == sizeof (dummy));
+ break;
+ }
+#endif
+}
+
+int zmq::signaler_t::wait (int timeout_)
+{
+#ifdef ZMQ_SIGNALER_WAIT_BASED_ON_POLL
+
+ struct pollfd pfd;
+ pfd.fd = r;
+ pfd.events = POLLIN;
+ int rc = poll (&pfd, 1, timeout_);
+ if (unlikely (rc < 0)) {
+ zmq_assert (errno == EINTR);
+ return -1;
+ }
+ else if (unlikely (rc == 0)) {
+ errno = EAGAIN;
+ return -1;
+ }
+ zmq_assert (rc == 1);
+ zmq_assert (pfd.revents & POLLIN);
+ return 0;
+
+#elif defined ZMQ_SIGNALER_WAIT_BASED_ON_SELECT
+
+ fd_set fds;
+ FD_ZERO (&fds);
+ FD_SET (r, &fds);
+ struct timeval timeout;
+ timeout.tv_sec = timeout_ / 1000;
+ timeout.tv_usec = timeout_ % 1000 * 1000;
+#ifdef ZMQ_HAVE_WINDOWS
+ int rc = select (0, &fds, NULL, NULL, &timeout);
+ wsa_assert (rc != SOCKET_ERROR);
+#else
+ int rc = select (r + 1, &fds, NULL, NULL, &timeout);
+ if (unlikely (rc < 0)) {
+ zmq_assert (errno == EINTR);
+ return -1;
+ }
+#endif
+ if (unlikely (rc == 0)) {
+ errno = EAGAIN;
+ return -1;
+ }
+ zmq_assert (rc == 1);
+ return 0;
+
+#else
+#error
+#endif
+}
+
+void zmq::signaler_t::recv ()
+{
+ // Attempt to read a signal.
+ unsigned char dummy;
+#if ZMQ_HAVE_WINDOWS
+ int nbytes = ::recv (r, &dummy, sizeof (dummy), 0);
+ wsa_assert (nbytes != SOCKET_ERROR);
+#else
+ ssize_t nbytes = ::recv (r, &dummy, sizeof (dummy), 0);
+ errno_assert (nbytes >= 0);
+#endif
+ zmq_assert (nbytes == sizeof (dummy));
+ zmq_assert (dummy == 0);
+}
+
+int zmq::signaler_t::make_fdpair (fd_t *r_, fd_t *w_)
+{
+#if defined ZMQ_HAVE_WINDOWS
+
+ // Windows has no 'socketpair' function. CreatePipe is no good as pipe
+ // handles cannot be polled on. Here we create the socketpair by hand.
+ *w_ = INVALID_SOCKET;
+ *r_ = INVALID_SOCKET;
+
+ // Create listening socket.
+ SOCKET listener;
+ listener = socket (AF_INET, SOCK_STREAM, 0);
+ wsa_assert (listener != INVALID_SOCKET);
+
+ // Set SO_REUSEADDR and TCP_NODELAY on listening socket.
+ BOOL so_reuseaddr = 1;
+ int rc = setsockopt (listener, SOL_SOCKET, SO_REUSEADDR,
+ (char *)&so_reuseaddr, sizeof (so_reuseaddr));
+ wsa_assert (rc != SOCKET_ERROR);
+ BOOL tcp_nodelay = 1;
+ rc = setsockopt (listener, IPPROTO_TCP, TCP_NODELAY,
+ (char *)&tcp_nodelay, sizeof (tcp_nodelay));
+ wsa_assert (rc != SOCKET_ERROR);
+
+ // Bind listening socket to any free local port.
+ struct sockaddr_in addr;
+ memset (&addr, 0, sizeof (addr));
+ addr.sin_family = AF_INET;
+ addr.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
+ addr.sin_port = 0;
+ rc = bind (listener, (const struct sockaddr*) &addr, sizeof (addr));
+ wsa_assert (rc != SOCKET_ERROR);
+
+ // Retrieve local port listener is bound to (into addr).
+ int addrlen = sizeof (addr);
+ 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 writer socket.
+ *w_ = WSASocket (AF_INET, SOCK_STREAM, 0, NULL, 0, 0);
+ wsa_assert (*w_ != INVALID_SOCKET);
+
+ // Set TCP_NODELAY on writer socket.
+ rc = setsockopt (*w_, IPPROTO_TCP, TCP_NODELAY,
+ (char *)&tcp_nodelay, sizeof (tcp_nodelay));
+ wsa_assert (rc != SOCKET_ERROR);
+
+ // Connect writer to the listener.
+ rc = connect (*w_, (sockaddr *) &addr, sizeof (addr));
+ wsa_assert (rc != SOCKET_ERROR);
+
+ // Accept connection from writer.
+ *r_ = accept (listener, NULL, NULL);
+ wsa_assert (*r_ != INVALID_SOCKET);
+
+ // We don't need the listening socket anymore. Close it.
+ rc = closesocket (listener);
+ wsa_assert (rc != SOCKET_ERROR);
+
+ return 0;
+
+#elif defined ZMQ_HAVE_OPENVMS
+
+ // Whilst OpenVMS supports socketpair - it maps to AF_INET only. Further,
+ // it does not set the socket options TCP_NODELAY and TCP_NODELACK which
+ // can lead to performance problems.
+ //
+ // The bug will be fixed in V5.6 ECO4 and beyond. In the meantime, we'll
+ // create the socket pair manually.
+ sockaddr_in lcladdr;
+ memset (&lcladdr, 0, sizeof (lcladdr));
+ lcladdr.sin_family = AF_INET;
+ lcladdr.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
+ lcladdr.sin_port = 0;
+
+ int listener = socket (AF_INET, SOCK_STREAM, 0);
+ errno_assert (listener != -1);
+
+ int on = 1;
+ int 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);
+
+ socklen_t lcladdr_len = sizeof (lcladdr);
+
+ rc = getsockname (listener, (struct sockaddr*) &lcladdr, &lcladdr_len);
+ errno_assert (rc != -1);
+
+ rc = listen (listener, 1);
+ errno_assert (rc != -1);
+
+ *w_ = socket (AF_INET, SOCK_STREAM, 0);
+ errno_assert (*w_ != -1);
+
+ rc = setsockopt (*w_, IPPROTO_TCP, TCP_NODELAY, &on, sizeof (on));
+ errno_assert (rc != -1);
+
+ rc = setsockopt (*w_, IPPROTO_TCP, TCP_NODELACK, &on, sizeof (on));
+ errno_assert (rc != -1);
+
+ rc = connect (*w_, (struct sockaddr*) &lcladdr, sizeof (lcladdr));
+ errno_assert (rc != -1);
+
+ *r_ = accept (listener, NULL, NULL);
+ errno_assert (*r_ != -1);
+
+ close (listener);
+
+ return 0;
+
+#else // All other implementations support socketpair()
+
+ int sv [2];
+ int rc = socketpair (AF_UNIX, SOCK_STREAM, 0, sv);
+ errno_assert (rc == 0);
+ *w_ = sv [0];
+ *r_ = sv [1];
+ return 0;
+
+#endif
+}
+
+#if defined ZMQ_SIGNALER_WAIT_BASED_ON_SELECT
+#undef ZMQ_SIGNALER_WAIT_BASED_ON_SELECT
+#endif
+#if defined ZMQ_SIGNALER_WAIT_BASED_ON_POLL
+#undef ZMQ_SIGNALER_WAIT_BASED_ON_POLL
+#endif
+