mkfifoat: use new modules for Solaris and BSD bugs

Pick up Solaris 9 and BSD fixes to mkfifo and mknod.  No known
system has mknodat but broken mknod, so there is no need for
rpl_mkfifoat or rpl_mknodat.  Split mknodat into its own file.

* m4/mkfifoat.m4 (gl_FUNC_MKFIFOAT): Simplify.
* lib/mkfifoat.c (mknodat): Split...
* lib/mknodat.c (mknodat): ...into new file.
* modules/mkfifoat (Files): Ship new file.
(Depends-on): Add mkfifo, mknod.
* modules/mkfifoat-tests (Files): Reuse mkfifo tests.
(Depends-on): Add symlink.
* tests/test-mkfifoat.c (main): Enhance test.  Drop portions now
redundant with test_mkfifo.h.
(do_mkfifoat, do_mknodat): New helpers.

Signed-off-by: Eric Blake <ebb9@byu.net>

1 files changed, 57 insertions, 0 deletions

diff --git a/lib/mknodat.c b/lib/mknodat.c
new file mode 100644
index 0000000000..b5126bf8b7
--- /dev/null
+++ b/lib/mknodat.c
@@ -0,0 +1,57 @@
+/* Create an inode 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>
+
+#if !HAVE_MKNOD
+
+# include <errno.h>
+
+/* Mingw lacks mknod, so this wrapper is trivial.  */
+
+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 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 */