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Diffstat (limited to 'sysdeps/mach/hurd/pipe.c')
-rw-r--r--sysdeps/mach/hurd/pipe.c99
1 files changed, 99 insertions, 0 deletions
diff --git a/sysdeps/mach/hurd/pipe.c b/sysdeps/mach/hurd/pipe.c
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+++ b/sysdeps/mach/hurd/pipe.c
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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)
+ {
+ /* 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)