From 28f540f45bbacd939bfd07f213bcad2bf730b1bf Mon Sep 17 00:00:00 2001
From: Roland McGrath <roland@gnu.org>
Date: Sat, 18 Feb 1995 01:27:10 +0000
Subject: initial import

---
 sysdeps/mach/hurd/pipe.c | 99 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 99 insertions(+)
 create mode 100644 sysdeps/mach/hurd/pipe.c

(limited to 'sysdeps/mach/hurd/pipe.c')

diff --git a/sysdeps/mach/hurd/pipe.c b/sysdeps/mach/hurd/pipe.c
new file mode 100644
index 0000000000..07c802f5a0
--- /dev/null
+++ b/sysdeps/mach/hurd/pipe.c
@@ -0,0 +1,99 @@
+/* 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)
-- 
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