hurd: Implement pipe2

* sysdeps/mach/hurd/pipe2.c: New file, copy from pipe.c.  Evolve it to
	implement __pipe2.
	* sysdeps/mach/hurd/pipe.c (__pipe): Reimplement using __pipe2.

ChangeLog

@@ -9,6 +9,9 @@
 	SOCK_NONBLOCK.
 	* sysdeps/mach/hurd/socketpair.c (__socketpair): Handle SOCK_CLOEXEC
 	and SOCK_NONBLOCK.
+	* sysdeps/mach/hurd/pipe2.c: New file, copy from pipe.c.  Evolve it to
+	implement __pipe2.
+	* sysdeps/mach/hurd/pipe.c (__pipe): Reimplement using __pipe2.
 
 2018-07-19  Leonardo Sandoval  <leonardo.sandoval.gonzalez@intel.com>
 

sysdeps/mach/hurd/pipe.c

@@ -15,9 +15,6 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
-#include <errno.h>
-#include <sys/socket.h>
-#include <sys/stat.h>
 #include <unistd.h>
 
 /* Create a one-way communication channel (pipe).
@@ -28,23 +25,7 @@
 int
 __pipe (int fds[2])
 {
-  int save_errno = errno;
+  return __pipe2 (fds, 0);
-  int result;
-
-  /* The magic S_IFIFO protocol tells the pflocal server to create
-     sockets which report themselves as FIFOs, as POSIX requires for
-     pipes.  */
-  result = __socketpair (PF_LOCAL, SOCK_STREAM, S_IFIFO, fds);
-  if (result == -1 && errno == EPROTONOSUPPORT)
-    {
-      /* We contacted an "old" pflocal server that doesn't support the
-         magic S_IFIFO protocol.
-	 FIXME: Remove this junk somewhere in the future.  */
-      __set_errno (save_errno);
-      return __socketpair (PF_LOCAL, SOCK_STREAM, 0, fds);
-    }
-
-  return result;
 }
 libc_hidden_def (__pipe)
 weak_alias (__pipe, pipe)

sysdeps/mach/hurd/pipe2.c

@@ -0,0 +1,60 @@
+/* Copyright (C) 1992-2015 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 Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <errno.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <fcntl-internal.h>
+#include <hurd.h>
+
+/* Create a one-way communication channel (pipe).
+   Actually the channel is two-way on the Hurd.
+   If successful, two file descriptors are stored in FDS;
+   bytes written on FDS[1] can be read from FDS[0].
+   Apply FLAGS to the new file descriptors.
+   Returns 0 if successful, -1 if not.  */
+int
+__pipe2 (int fds[2], int flags)
+{
+  int save_errno = errno;
+  int result;
+
+  if (flags & ~(O_CLOEXEC | O_NONBLOCK))
+    return __hurd_fail (EINVAL);
+
+  flags = o_to_sock_flags (flags);
+
+  /* The magic S_IFIFO protocol tells the pflocal server to create
+     sockets which report themselves as FIFOs, as POSIX requires for
+     pipes.  */
+  result = __socketpair (PF_LOCAL, SOCK_STREAM | flags, S_IFIFO, fds);
+  if (result == -1 && errno == EPROTONOSUPPORT)
+    {
+      /* We contacted an "old" pflocal server that doesn't support the
+         magic S_IFIFO protocol.
+	 FIXME: Remove this junk somewhere in the future.  */
+      __set_errno (save_errno);
+      return __socketpair (PF_LOCAL, SOCK_STREAM | flags, 0, fds);
+    }
+
+  return result;
+}
+weak_alias (__pipe2, pipe2)