/* 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 . */ #include "signaler.hpp" #include "platform.hpp" #include "err.hpp" #include "fd.hpp" #include "ip.hpp" #if defined ZMQ_HAVE_OPENVMS #include #include #elif defined ZMQ_HAVE_WINDOWS #include "windows.hpp" #else #include #include #include #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 #include 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; do { ::send (w, &cmd_, sizeof (command_t), 0); } while (nbytes == -1 && errno == EINTR); 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; do { nbytes = ::recv (r, buffer, sizeof (command_t), 0); } while (nbytes == -1 && errno == EINTR); 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 #include 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; do { nbytes = ::send (w, &cmd_, sizeof (command_t), 0); } while (nbytes == -1 && errno == EINTR); 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; do { nbytes = ::recv (r, cmd_, sizeof (command_t), block_ ? 0 : MSG_DONTWAIT); } while (nbytes == -1 && errno == EINTR); // 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