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/* -*- mode: C++; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 99; -*- */
/* vim: set ts=4 sw=4 et tw=99: */
/*
* distcc -- A simple distributed compiler system
*
* Copyright (C) 2002, 2003 by Martin Pool <mbp@samba.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "pipes.h"
#include <unistd.h>
#include <fcntl.h>
#include <sys/socket.h>
// Create pipe with a larger buffer, this saves context switches and latencies.
int create_large_pipe( int pipefds[ 2 ] )
{
// On Linux, the situation seems to be as follows:
// SO_SNDBUFFORCE should allow the largest size, but it requires
// the CAP_NET_ADMIN privilege and on Linux we normally run without
// privileges (except for chroot). The F_SETPIPE_SZ defaults to 1MiB
// max size, so if available, it should be the second one.
// The maximum for SO_SNDBUF seems to be just 256KiB, so that one goes
// last.
#ifdef F_SETPIPE_SZ
if( pipe( pipefds ) == 0 )
{
fcntl( pipefds[ 1 ], F_SETPIPE_SZ, 1048576 );
// Do not bother checking if this succeeded.
return 0;
}
#endif
// We use a socket pair instead of a pipe to get a "slightly" bigger
// output buffer. This saves context switches and latencies.
int ret = socketpair(AF_UNIX, SOCK_STREAM, 0, pipefds);
if( ret < 0)
return ret;
int maxsize = 2 * 1024 * 2024;
#ifdef SO_SNDBUFFORCE
if (setsockopt(pipefds[1], SOL_SOCKET, SO_SNDBUFFORCE, &maxsize, sizeof(maxsize)) < 0)
#endif
{
setsockopt(pipefds[1], SOL_SOCKET, SO_SNDBUF, &maxsize, sizeof(maxsize));
}
return 0;
}
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