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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_socket.hpp"
#include "platform.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_socket_t::tcp_socket_t () :
s (retired_fd)
{
}
zmq::tcp_socket_t::~tcp_socket_t ()
{
if (s != retired_fd)
close ();
}
int zmq::tcp_socket_t::open (fd_t fd_)
{
assert (s == retired_fd);
s = fd_;
return 0;
}
int zmq::tcp_socket_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_socket_t::get_fd ()
{
return s;
}
int zmq::tcp_socket_t::write (const void *data, int size)
{
ssize_t nbytes = send (s, data, size, 0);
// Several errors are OK. When speculative write is being done we may not
// be able to write a single byte to the socket. Also, SIGSTOP issued
// by a debugging tool can result in EINTR error.
if (nbytes == -1 && (errno == EAGAIN || errno == EWOULDBLOCK ||
errno == EINTR))
return 0;
// Signalise peer failure.
if (nbytes == -1 && errno == ECONNRESET)
return -1;
errno_assert (nbytes != -1);
return (size_t) nbytes;
}
int zmq::tcp_socket_t::read (void *data, int size)
{
ssize_t nbytes = recv (s, data, size, 0);
// Several errors are OK. When speculative read is being done we may not
// be able to read a single byte to the socket. Also, SIGSTOP issued
// by a debugging tool can result in EINTR error.
if (nbytes == -1 && (errno == EAGAIN || errno == EWOULDBLOCK ||
errno == EINTR))
return 0;
// Signalise peer failure.
if (nbytes == -1 && (errno == ECONNRESET || errno == ECONNREFUSED))
return -1;
errno_assert (nbytes != -1);
// Orderly shutdown by the other peer.
if (nbytes == 0)
return -1;
return (size_t) nbytes;
}
#endif
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