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/*
Copyright (c) 2007-2013 Contributors as noted in the AUTHORS file
This file is part of 0MQ.
0MQ is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser 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
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "ip.hpp"
#include "tcp.hpp"
#include "err.hpp"
#include "platform.hpp"
#if defined ZMQ_HAVE_WINDOWS
#include "windows.hpp"
#else
#include <fcntl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#endif
#if defined ZMQ_HAVE_OPENVMS
#include <ioctl.h>
#endif
void zmq::tune_tcp_socket (fd_t s_)
{
// Disable Nagle's algorithm. We are doing data batching on 0MQ level,
// so using Nagle wouldn't improve throughput in anyway, but it would
// hurt latency.
int nodelay = 1;
int rc = setsockopt (s_, IPPROTO_TCP, TCP_NODELAY, (char*) &nodelay,
sizeof (int));
#ifdef ZMQ_HAVE_WINDOWS
wsa_assert (rc != SOCKET_ERROR);
#else
errno_assert (rc == 0);
#endif
#ifdef ZMQ_HAVE_OPENVMS
// Disable delayed acknowledgements as they hurt latency is serious manner.
int nodelack = 1;
rc = setsockopt (s_, IPPROTO_TCP, TCP_NODELACK, (char*) &nodelack,
sizeof (int));
errno_assert (rc != SOCKET_ERROR);
#endif
}
void zmq::set_tcp_send_buffer (fd_t sockfd_, int bufsize_)
{
const int rc = setsockopt (sockfd_, SOL_SOCKET, SO_SNDBUF,
(char*) &bufsize_, sizeof bufsize_);
#ifdef ZMQ_HAVE_WINDOWS
wsa_assert (rc != SOCKET_ERROR);
#else
errno_assert (rc == 0);
#endif
}
void zmq::set_tcp_receive_buffer (fd_t sockfd_, int bufsize_)
{
const int rc = setsockopt (sockfd_, SOL_SOCKET, SO_RCVBUF,
(char*) &bufsize_, sizeof bufsize_);
#ifdef ZMQ_HAVE_WINDOWS
wsa_assert (rc != SOCKET_ERROR);
#else
errno_assert (rc == 0);
#endif
}
void zmq::tune_tcp_keepalives (fd_t s_, int keepalive_, int keepalive_cnt_, int keepalive_idle_, int keepalive_intvl_)
{
// These options are used only under certain #ifdefs below.
(void)keepalive_;
(void)keepalive_cnt_;
(void)keepalive_idle_;
(void)keepalive_intvl_;
// If none of the #ifdefs apply, then s_ is unused.
(void)s_;
// Tuning TCP keep-alives if platform allows it
// All values = -1 means skip and leave it for OS
#ifdef ZMQ_HAVE_WINDOWS
tcp_keepalive keepalive_opts;
keepalive_opts.onoff = keepalive_;
keepalive_opts.keepalivetime = keepalive_idle_ != -1 ? keepalive_idle_ * 1000 : 7200000;
keepalive_opts.keepaliveinterval = keepalive_intvl_ != -1 ? keepalive_intvl_ * 1000 : 1000;
DWORD num_bytes_returned;
int rc = WSAIoctl(s_, SIO_KEEPALIVE_VALS, &keepalive_opts, sizeof(keepalive_opts), NULL, 0, &num_bytes_returned, NULL, NULL);
wsa_assert (rc != SOCKET_ERROR);
#else
#ifdef ZMQ_HAVE_SO_KEEPALIVE
if (keepalive_ != -1) {
int rc = setsockopt (s_, SOL_SOCKET, SO_KEEPALIVE, (char*) &keepalive_, sizeof (int));
errno_assert (rc == 0);
#ifdef ZMQ_HAVE_TCP_KEEPCNT
if (keepalive_cnt_ != -1) {
int rc = setsockopt (s_, IPPROTO_TCP, TCP_KEEPCNT, &keepalive_cnt_, sizeof (int));
errno_assert (rc == 0);
}
#endif // ZMQ_HAVE_TCP_KEEPCNT
#ifdef ZMQ_HAVE_TCP_KEEPIDLE
if (keepalive_idle_ != -1) {
int rc = setsockopt (s_, IPPROTO_TCP, TCP_KEEPIDLE, &keepalive_idle_, sizeof (int));
errno_assert (rc == 0);
}
#else // ZMQ_HAVE_TCP_KEEPIDLE
#ifdef ZMQ_HAVE_TCP_KEEPALIVE
if (keepalive_idle_ != -1) {
int rc = setsockopt (s_, IPPROTO_TCP, TCP_KEEPALIVE, &keepalive_idle_, sizeof (int));
errno_assert (rc == 0);
}
#endif // ZMQ_HAVE_TCP_KEEPALIVE
#endif // ZMQ_HAVE_TCP_KEEPIDLE
#ifdef ZMQ_HAVE_TCP_KEEPINTVL
if (keepalive_intvl_ != -1) {
int rc = setsockopt (s_, IPPROTO_TCP, TCP_KEEPINTVL, &keepalive_intvl_, sizeof (int));
errno_assert (rc == 0);
}
#endif // ZMQ_HAVE_TCP_KEEPINTVL
}
#endif // ZMQ_HAVE_SO_KEEPALIVE
#endif // ZMQ_HAVE_WINDOWS
}
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