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/* $Id$ */
/***
This file is part of polypaudio.
polypaudio is free software; you can redistribute it and/or modify it
under the terms of the GNU Library General Public License as published
by the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
polypaudio 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with polypaudio; If not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
USA.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#include "winsock.h"
#include "pipe.h"
#ifndef HAVE_PIPE
static int set_block(int fd, int blocking) {
#ifdef O_NONBLOCK
int v;
assert(fd >= 0);
if ((v = fcntl(fd, F_GETFL)) < 0)
return -1;
if (blocking)
v &= ~O_NONBLOCK;
else
v |= O_NONBLOCK;
if (fcntl(fd, F_SETFL, v) < 0)
return -1;
return 0;
#elif defined(OS_IS_WIN32)
u_long arg;
arg = !blocking;
if (ioctlsocket(fd, FIONBIO, &arg) < 0)
return -1;
return 0;
#else
return -1;
#endif
}
int pipe(int filedes[2]) {
int listener;
struct sockaddr_in addr, peer;
socklen_t len;
listener = -1;
filedes[0] = -1;
filedes[1] = -1;
listener = socket(PF_INET, SOCK_STREAM, 0);
if (listener < 0)
goto error;
filedes[0] = socket(PF_INET, SOCK_STREAM, 0);
if (filedes[0] < 0)
goto error;
filedes[1] = socket(PF_INET, SOCK_STREAM, 0);
if (filedes[1] < 0)
goto error;
/* Make non-blocking so that connect() won't block */
if (set_block(filedes[0], 0) < 0)
goto error;
addr.sin_family = AF_INET;
addr.sin_port = 0;
addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
if (bind(listener, (struct sockaddr*)&addr, sizeof(addr)) < 0)
goto error;
if (listen(listener, 1) < 0)
goto error;
len = sizeof(addr);
if (getsockname(listener, (struct sockaddr*)&addr, &len) < 0)
goto error;
if (connect(filedes[0], (struct sockaddr*)&addr, sizeof(addr)) < 0) {
#ifdef OS_IS_WIN32
if (WSAGetLastError() != EWOULDBLOCK)
#else
if (errno != EINPROGRESS)
#endif
goto error;
}
len = sizeof(peer);
filedes[1] = accept(listener, (struct sockaddr*)&peer, &len);
if (filedes[1] < 0)
goto error;
/* Restore blocking */
if (set_block(filedes[0], 1) < 0)
goto error;
len = sizeof(addr);
if (getsockname(filedes[0], (struct sockaddr*)&addr, &len) < 0)
goto error;
/* Check that someone else didn't steal the connection */
if ((addr.sin_port != peer.sin_port) || (addr.sin_addr.s_addr != peer.sin_addr.s_addr))
goto error;
close(listener);
return 0;
error:
if (listener >= 0)
close(listener);
if (filedes[0] >= 0)
close(filedes[0]);
if (filedes[1] >= 0)
close(filedes[0]);
return -1;
}
#endif /* HAVE_PIPE */
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