Move some things from sysdeps/unix to sysdeps/posix.

sysdeps/posix/mkfifoat.c

@@ -0,0 +1,31 @@
+/* Copyright (C) 2005 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, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <sys/stat.h>
+
+
+/* Create a new FIFO with permission bits MODE.  But interpret
+   relative PATH names relative to the directory associated with FD.  */
+int
+mkfifoat (fd, file, mode)
+     int fd;
+     const char *file;
+     mode_t mode;
+{
+  dev_t dev = 0;
+  return __xmknodat (_MKNOD_VER, fd, file, mode | S_IFIFO, &dev);
+}