openat: declare in POSIX headers * NEWS: Mention this. * modules/openat (configure.ac): Declare witnesses. (Depends-on): Add fcntl-h, sys_stat, unistd. (Include): Mention correct headers. * modules/fcntl-h (Depends-on): Add link-warning. (Files): Add openat.m4. (Makefile.am): Substitute witnesses. * modules/sys_stat (Files, Makefile.am): Likewise. * modules/unistd (Files, Makefile.am): Likewise. * m4/openat.m4 (gl_FUNC_OPENAT, gl_FUNC_FCHOWNAT): Set witnesses. (gl_OPENAT_DEFAULTS): New macro. * m4/fcntl_h.m4 (gl_FCNTL_H_DEFAULTS): Use it. * m4/unistd_h.m4 (gl_UNISTD_H_DEFAULTS): Likewise. * m4/sys_stat_h.m4 (gl_SYS_STAT_H_DEFAULTS): Likewise. (SYS_STAT_H): Remove unused variable. * doc/posix-headers/fcntl.texi (fcntl.h): Update content. * lib/fcntl--.h (includes): Remove unneeded header. * lib/openat-safer.c (includes): Likewise. * lib/openat.h (AT_FDCWD, AT_SYMLINK_NOFOLLOW, AT_REMOVEDIR) (openat, fstatat, unlinkat, mkdirat, fchmodat, fchownat): Move to appropriate headers. (__OPENAT_PREFIX): Delete. * lib/fcntl.in.h (openat): Provide declaration. (AT_FDCWD): Fix Solaris bug. (AT_SYMLINK_NOFOLLOW, AT_REMOVEDIR): Provide macros. * lib/sys_stat.in.h (fstatat, mkdirat): Provide declaration. * lib/fchmodat.c (includes): Adjust to find declaration. * lib/fchownat.c (includes): Likewise. * lib/mkdirat.c (includes): Likewise. * lib/fstatat.c (includes): Likewise. Ensure original fstatat is still visible. Signed-off-by: Eric Blake <ebb9@byu.net>

--- a/lib/fstatat.c
+++ b/lib/fstatat.c
@@ -1,6 +1,6 @@
 /* Work around an fstatat bug on Solaris 9.
 
-   Copyright (C) 2006 Free Software Foundation, Inc.
+   Copyright (C) 2006, 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
@@ -19,12 +19,13 @@
 
 #include <config.h>
 
-#define COMPILING_FSTATAT 1
-#include "openat.h"
+#include <sys/stat.h>
 
 #include <errno.h>
 #include <string.h>
 
+#undef fstatat
+
 /* fstatat should always follow symbolic links that end in /, but on
    Solaris 9 it doesn't if AT_SYMLINK_NOFOLLOW is specified.  This is
    the same problem that lstat.c addresses, so solve it in a similar