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/*
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 <http://www.gnu.org/licenses/>.
*/
#include "tcp_listener.hpp"
#include "platform.hpp"
#include "ip.hpp"
#include "config.hpp"
#include "err.hpp"
#ifdef ZMQ_HAVE_WINDOWS
#include "windows.hpp"
#error
#else
#include <unistd.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/tcp.h>
#include <netinet/in.h>
#include <netdb.h>
#include <fcntl.h>
zmq::tcp_listener_t::tcp_listener_t () :
s (retired_fd)
{
}
zmq::tcp_listener_t::~tcp_listener_t ()
{
if (s != retired_fd)
close ();
}
int zmq::tcp_listener_t::open (const char *addr_)
{
// Convert the interface into sockaddr_in structure.
sockaddr_in ip_address;
int rc = resolve_ip_interface (&ip_address, addr_);
if (rc != 0)
return -1;
// Create a listening socket.
s = socket (AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (s == -1)
return -1;
// Allow reusing of the address.
int flag = 1;
rc = setsockopt (s, SOL_SOCKET, SO_REUSEADDR, &flag, sizeof (int));
errno_assert (rc == 0);
// Set the non-blocking flag.
flag = fcntl (s, F_GETFL, 0);
if (flag == -1)
flag = 0;
rc = fcntl (s, F_SETFL, flag | O_NONBLOCK);
errno_assert (rc != -1);
// Bind the socket to the network interface and port.
rc = bind (s, (struct sockaddr*) &ip_address, sizeof (ip_address));
if (rc != 0) {
close ();
return -1;
}
// Listen for incomming connections.
rc = listen (s, tcp_connection_backlog);
if (rc != 0) {
close ();
return -1;
}
return 0;
}
int zmq::tcp_listener_t::close ()
{
zmq_assert (s != retired_fd);
int rc = ::close (s);
if (rc != 0)
return -1;
s = retired_fd;
return 0;
}
zmq::fd_t zmq::tcp_listener_t::get_fd ()
{
return s;
}
zmq::fd_t zmq::tcp_listener_t::accept ()
{
zmq_assert (s != retired_fd);
// Accept one incoming connection.
fd_t sock = ::accept (s, NULL, NULL);
#if (defined ZMQ_HAVE_LINUX || defined ZMQ_HAVE_FREEBSD || \
defined ZMQ_HAVE_OPENBSD || defined ZMQ_HAVE_OSX || \
defined ZMQ_HAVE_OPENVMS)
if (sock == -1 &&
(errno == EAGAIN || errno == EWOULDBLOCK ||
errno == EINTR || errno == ECONNABORTED))
return retired_fd;
#elif (defined ZMQ_HAVE_SOLARIS || defined ZMQ_HAVE_AIX)
if (sock == -1 &&
(errno == EWOULDBLOCK || errno == EINTR ||
errno == ECONNABORTED || errno == EPROTO))
return retired_fd;
#elif defined ZMQ_HAVE_HPUX
if (sock == -1 &&
(errno == EAGAIN || errno == EWOULDBLOCK ||
errno == EINTR || errno == ECONNABORTED || errno == ENOBUFS))
return retired_fd;
#elif defined ZMQ_HAVE_QNXNTO
if (sock == -1 &&
(errno == EWOULDBLOCK || errno == EINTR || errno == ECONNABORTED))
return retired_fd;
#endif
errno_assert (sock != -1);
// Set to non-blocking mode.
int flags = fcntl (s, F_GETFL, 0);
if (flags == -1)
flags = 0;
int rc = fcntl (sock, F_SETFL, flags | O_NONBLOCK);
errno_assert (rc != -1);
// Disable Nagle's algorithm.
int flag = 1;
rc = setsockopt (sock, IPPROTO_TCP, TCP_NODELAY, (char*) &flag,
sizeof (int));
errno_assert (rc == 0);
#ifdef ZMQ_HAVE_OPENVMS
// Disable delayed acknowledgements.
flag = 1;
rc = setsockopt (sock, IPPROTO_TCP, TCP_NODELACK, (char*) &flag,
sizeof (int));
errno_assert (rc != SOCKET_ERROR);
#endif
return sock;
}
#endif
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