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/* net/uncork.c - Unstop a TCP socket from sending short writes.
* Copyright (C) 2001,2005 Bruce Guenter <bruce@untroubled.org>
*
* This library 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 2.1 of the License, or (at your option) any later version.
*
* This library 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 library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <sys/types.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <sys/socket.h>
#include <unistd.h>
#include "socket.h"
/** Unstop a TCP socket from sending short writes. */
int socket_uncork(int sock)
{
#if defined(TCP_CORK)
int flag = 0;
return setsockopt(sock, SOL_TCP, TCP_CORK, &flag, sizeof flag) == 0;
#elif defined(TCP_NOPUSH)
/* BSD's TCP_NOPUSH option only takes effect after a write/send.
* Hopefully this extra write will cause the TCP stack to send out
* any buffered writes. */
int flag = 0;
if (setsockopt(sock, SOL_SOCKET, TCP_NOPUSH, &flag, sizeof flag) != 0) return 0;
return write(sock, &flag, 0) == 0;
#else
return 1;
#endif
}
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