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- /* Copyright (C) 1992, 1993, 1994 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)
- {
- /* 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;
- }
-