--- /dev/null
+/* Create a named fifo relative to an open directory.
+ Copyright (C) 2009 Free Software Foundation, Inc.
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program 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 General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+/* written by Eric Blake */
+
+#include <config.h>
+
+#include <sys/stat.h>
+
+#include "dirname.h" /* solely for definition of IS_ABSOLUTE_FILE_NAME */
+#include "openat.h"
+#include "openat-priv.h"
+#include "save-cwd.h"
+
+#ifndef HAVE_MKFIFO
+# define HAVE_MKFIFO 0
+#endif
+#ifndef HAVE_MKNOD
+# define HAVE_MKNOD 0
+#endif
+
+/* For now, all known systems either have both mkfifo and mknod, or
+ neither. If this is not true, we can implement the portable
+ aspects of one using the other (POSIX only requires mknod to create
+ fifos; all other uses of mknod are for root users and outside the
+ realm of POSIX). */
+#if HAVE_MKNOD != HAVE_MKFIFO
+# error Please report this message and your system to bug-gnulib@gnu.org.
+#endif
+
+#if !HAVE_MKFIFO
+/* Mingw lacks mkfifo and mknod, so this wrapper is trivial. */
+
+# include <errno.h>
+
+int
+mkfifoat (int fd _UNUSED_PARAMETER_, char const *path _UNUSED_PARAMETER_,
+ mode_t mode _UNUSED_PARAMETER_)
+{
+ errno = ENOSYS;
+ return -1;
+}
+
+int
+mknodat (int fd _UNUSED_PARAMETER_, char const *path _UNUSED_PARAMETER_,
+ mode_t mode _UNUSED_PARAMETER_, dev_t dev _UNUSED_PARAMETER_)
+{
+ errno = ENOSYS;
+ return -1;
+}
+
+#else /* HAVE_MKFIFO */
+
+/* Create a named fifo FILE relative to directory FD, with access
+ permissions in MODE. If possible, do it without changing the
+ working directory. Otherwise, resort to using save_cwd/fchdir,
+ then mkfifo/restore_cwd. If either the save_cwd or the restore_cwd
+ fails, then give a diagnostic and exit nonzero. */
+
+# define AT_FUNC_NAME mkfifoat
+# define AT_FUNC_F1 mkfifo
+# define AT_FUNC_POST_FILE_PARAM_DECLS , mode_t mode
+# define AT_FUNC_POST_FILE_ARGS , mode
+# include "at-func.c"
+# undef AT_FUNC_NAME
+# undef AT_FUNC_F1
+# undef AT_FUNC_POST_FILE_PARAM_DECLS
+# undef AT_FUNC_POST_FILE_ARGS
+
+/* Create a file system node FILE relative to directory FD, with
+ access permissions and file type in MODE, and device type in DEV.
+ Usually, non-root applications can only create named fifos, with
+ DEV set to 0. If possible, create the node without changing the
+ working directory. Otherwise, resort to using save_cwd/fchdir,
+ then mknod/restore_cwd. If either the save_cwd or the restore_cwd
+ fails, then give a diagnostic and exit nonzero. */
+
+# define AT_FUNC_NAME mknodat
+# define AT_FUNC_F1 mknod
+# define AT_FUNC_POST_FILE_PARAM_DECLS , mode_t mode, dev_t dev
+# define AT_FUNC_POST_FILE_ARGS , mode, dev
+# include "at-func.c"
+# undef AT_FUNC_NAME
+# undef AT_FUNC_F1
+# undef AT_FUNC_POST_FILE_PARAM_DECLS
+# undef AT_FUNC_POST_FILE_ARGS
+
+#endif /* HAVE_MKFIFO */