/* 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 . */ #include "fd_signaler.hpp" #include "platform.hpp" #include "err.hpp" #include "fd.hpp" #include "ip.hpp" #if defined ZMQ_HAVE_OPENVMS #include #elif defined ZMQ_HAVE_WINDOWS #include "windows.hpp" #else #include #include #endif #if defined ZMQ_HAVE_EVENTFD #include zmq::fd_signaler_t::fd_signaler_t () { // Create eventfd object. fd = eventfd (0, 0); errno_assert (fd != -1); // Set to non-blocking mode. int flags = fcntl (fd, F_GETFL, 0); if (flags == -1) flags = 0; int rc = fcntl (fd, F_SETFL, flags | O_NONBLOCK); errno_assert (rc != -1); } zmq::fd_signaler_t::~fd_signaler_t () { int rc = close (fd); errno_assert (rc != -1); } void zmq::fd_signaler_t::signal (int signal_) { zmq_assert (signal_ >= 0 && signal_ < 64); uint64_t inc = 1; inc <<= signal_; ssize_t sz = write (fd, &inc, sizeof (uint64_t)); errno_assert (sz == sizeof (uint64_t)); } uint64_t zmq::fd_signaler_t::poll () { // TODO: Can we do a blocking read on non-blocking eventfd? // It's not needed as for now, so let it stay unimplemented. zmq_assert (false); } uint64_t zmq::fd_signaler_t::check () { uint64_t val; ssize_t sz = read (fd, &val, sizeof (uint64_t)); if (sz == -1 && (errno == EAGAIN || errno == EINTR)) return 0; errno_assert (sz != -1); return val; } zmq::fd_t zmq::fd_signaler_t::get_fd () { return fd; } #elif defined ZMQ_HAVE_WINDOWS zmq::fd_signaler_t::fd_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; resolve_ip_hostname (&addr, "127.0.0.1:0"); 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); rc = closesocket (listener); wsa_assert (rc != SOCKET_ERROR); } zmq::fd_signaler_t::~fd_signaler_t () { int rc = closesocket (w); wsa_assert (rc != SOCKET_ERROR); rc = closesocket (r); wsa_assert (rc != SOCKET_ERROR); } void zmq::fd_signaler_t::signal (int signal_) { // TODO: Note that send is a blocking operation. // How should we behave if the signal cannot be written to the signaler? zmq_assert (signal_ >= 0 && signal_ < 64); char c = (char) signal_; int rc = send (w, &c, 1, 0); win_assert (rc != SOCKET_ERROR); } uint64_t zmq::fd_signaler_t::poll () { // If there are signals available, return straight away. uint64_t signals = check (); if (signals) return signals; // If there are no signals, wait until at least one signal arrives. unsigned char sig; int nbytes = recv (r, (char*) &sig, 1, 0); win_assert (nbytes != -1); return uint64_t (1) << sig; } uint64_t zmq::fd_signaler_t::check () { unsigned char buffer [32]; int nbytes = recv (r, (char*) buffer, 32, MSG_DONTWAIT); if (nbytes == -1 && errno == EAGAIN) return 0; win_assert (nbytes != -1); uint64_t signals = 0; for (int pos = 0; pos != nbytes; pos++) { zmq_assert (buffer [pos] < 64); signals |= (uint64_t (1) << (buffer [pos])); } return signals; } zmq::fd_t zmq::fd_signaler_t::get_fd () { return r; } #else #include #include zmq::fd_signaler_t::fd_signaler_t () { int sv [2]; int rc = socketpair (AF_UNIX, SOCK_STREAM, 0, sv); errno_assert (rc == 0); w = sv [0]; r = sv [1]; } zmq::fd_signaler_t::~fd_signaler_t () { close (w); close (r); } void zmq::fd_signaler_t::signal (int signal_) { // TODO: Note that send is a blocking operation. // How should we behave if the signal cannot be written to the signaler? zmq_assert (signal_ >= 0 && signal_ < 64); unsigned char c = (unsigned char) signal_; ssize_t nbytes = send (w, &c, 1, 0); errno_assert (nbytes == 1); } uint64_t zmq::fd_signaler_t::poll () { // If there are signals available, return straight away. uint64_t signals = check (); if (signals) return signals; // If there are no signals, wait until at least one signal arrives. unsigned char sig; ssize_t nbytes = recv (r, &sig, 1, 0); errno_assert (nbytes != -1); return uint64_t (1) << sig; } uint64_t zmq::fd_signaler_t::check () { unsigned char buffer [32]; ssize_t nbytes = recv (r, buffer, 32, MSG_DONTWAIT); if (nbytes == -1 && errno == EAGAIN) return 0; zmq_assert (nbytes != -1); uint64_t signals = 0; for (int pos = 0; pos != nbytes; pos ++) { zmq_assert (buffer [pos] < 64); signals |= (uint64_t (1) << (buffer [pos])); } return signals; } zmq::fd_t zmq::fd_signaler_t::get_fd () { return r; } #endif #if defined ZMQ_HAVE_OPENVMS int zmq::fd_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 = 0x0100007f; lcladdr.sin_port = INADDR_ANY; 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