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/* Copyright (C) 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library 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.
The GNU C 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA. */
#include <ansidecl.h>
#include <errno.h>
#include <unistd.h>
#include <stddef.h>
#include <hurd.h>
#include <hurd/fd.h>
#include <sys/socket.h>
#include <hurd/socket.h>
#include <fcntl.h>
/* Create a one-way communication channel (pipe).
If successul, two file descriptors are stored in FDS;
bytes written on FDS[1] can be read from FDS[0].
Returns 0 if successful, -1 if not. */
int
DEFUN(__pipe, (fds), int fds[2])
{
error_t err;
socket_t server, sock1, sock2;
int d1, d2;
if (fds == NULL)
return __hurd_fail (EINVAL);
/* Find the local domain socket server. */
server = _hurd_socket_server (PF_LOCAL, 0);
if (server == MACH_PORT_NULL)
return -1;
/* Create two local domain sockets and connect them together. */
err = __socket_create (server, SOCK_STREAM, 0, &sock1);
if (err == MACH_SEND_INVALID_DEST || err == MIG_SERVER_DIED
|| err == MIG_BAD_ID || err == EOPNOTSUPP)
{
/* On the first use of the socket server during the operation,
allow for the old server port dying. */
server = _hurd_socket_server (PF_LOCAL, 1);
if (server == MACH_PORT_NULL)
return -1;
err = __socket_create (server, SOCK_STREAM, 0, &sock1);
}
if (err)
return __hurd_fail (err);
if (err = __socket_create (server, SOCK_STREAM, 0, &sock2))
{
__mach_port_deallocate (__mach_task_self (), sock1);
return __hurd_fail (err);
}
if (err = __socket_connect2 (sock1, sock2))
{
__mach_port_deallocate (__mach_task_self (), sock1);
__mach_port_deallocate (__mach_task_self (), sock2);
return __hurd_fail (err);
}
/* Shut down the unused sides of the sockets. */
__socket_shutdown (sock1, 1);
__socket_shutdown (sock2, 0);
/* Put the sockets into file descriptors. */
d1 = _hurd_intern_fd (sock1, O_IGNORE_CTTY, 1);
if (d1 < 0)
{
__mach_port_deallocate (__mach_task_self (), sock2);
return -1;
}
d2 = _hurd_intern_fd (sock2, O_IGNORE_CTTY, 1);
if (d2 < 0)
{
err = errno;
(void) close (d1);
return __hurd_fail (err);
}
fds[0] = d1;
fds[1] = d2;
return 0;
}
weak_alias (__pipe, pipe)
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