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/*
Copyright (c) 2010-2012 250bpm s.r.o.
Copyright (c) 2007-2009 iMatix Corporation
Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
This file is part of Crossroads I/O project.
Crossroads I/O 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.
Crossroads 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 "err.hpp"
#include "platform.hpp"
#if defined XS_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 XS_HAVE_OPENVMS
#include <ioctl.h>
#endif
xs::fd_t xs::open_socket (int domain_, int type_, int protocol_)
{
// Setting this option result in sane behaviour when exec() functions
// are used. Old sockets are closed and don't block TCP ports etc.
#if defined XS_HAVE_SOCK_CLOEXEC
type_ |= SOCK_CLOEXEC;
#endif
fd_t s = socket (domain_, type_, protocol_);
if (s == retired_fd)
return retired_fd;
// If there's no SOCK_CLOEXEC, let's try the second best option. Note that
// race condition can cause socket not to be closed (if fork happens
// between socket creation and this point).
#if !defined XS_HAVE_SOCK_CLOEXEC && defined FD_CLOEXEC
int rc = fcntl (s, F_SETFD, FD_CLOEXEC);
errno_assert (rc != -1);
#endif
// On Windows, preventing sockets to be inherited by child processes is
// done using SetHandleInformation function.
#if defined XS_HAVE_WINDOWS && defined HANDLE_FLAG_INHERIT
BOOL brc = SetHandleInformation ((HANDLE) s, HANDLE_FLAG_INHERIT, 0);
win_assert (brc);
#endif
return s;
}
void xs::tune_tcp_socket (fd_t s_, bool keepalive_)
{
// Disable Nagle's algorithm. We are doing data batching on Crossroads
// 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 XS_HAVE_WINDOWS
wsa_assert (rc != SOCKET_ERROR);
#else
errno_assert (rc == 0);
#endif
#ifdef XS_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
if (keepalive_) {
int keepalive = 1;
rc = setsockopt (s_, SOL_SOCKET, SO_KEEPALIVE, (char*) &keepalive,
sizeof (int));
#ifdef XS_HAVE_WINDOWS
wsa_assert (rc != SOCKET_ERROR);
#else
errno_assert (rc == 0);
#endif
}
}
void xs::unblock_socket (fd_t s_)
{
#ifdef XS_HAVE_WINDOWS
u_long nonblock = 1;
int rc = ioctlsocket (s_, FIONBIO, &nonblock);
wsa_assert (rc != SOCKET_ERROR);
#elif XS_HAVE_OPENVMS
int nonblock = 1;
int rc = ioctl (s_, FIONBIO, &nonblock);
errno_assert (rc != -1);
#else
int flags = fcntl (s_, F_GETFL, 0);
if (flags == -1)
flags = 0;
int rc = fcntl (s_, F_SETFL, flags | O_NONBLOCK);
errno_assert (rc != -1);
#endif
}
void xs::enable_ipv4_mapping (fd_t s_)
{
#ifdef IPV6_V6ONLY
#ifdef XS_HAVE_WINDOWS
DWORD flag = 0;
#else
int flag = 0;
#endif
int rc = setsockopt (s_, IPPROTO_IPV6, IPV6_V6ONLY, (const char*) &flag,
sizeof (flag));
#ifdef XS_HAVE_WINDOWS
wsa_assert (rc != SOCKET_ERROR);
#else
errno_assert (rc == 0);
#endif
#endif
}
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