From a15854bd92db69fcd0b4444fe1b8fe3610a7acf6 Mon Sep 17 00:00:00 2001 From: Martin Lucina Date: Mon, 23 Jan 2012 08:53:19 +0100 Subject: Imported Upstream version 2.0.7.dfsg --- src/signaler.cpp | 339 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 339 insertions(+) create mode 100644 src/signaler.cpp (limited to 'src/signaler.cpp') diff --git a/src/signaler.cpp b/src/signaler.cpp new file mode 100644 index 0000000..592688b --- /dev/null +++ b/src/signaler.cpp @@ -0,0 +1,339 @@ +/* + 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 = 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 +#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 = ::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 + -- cgit v1.2.3