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/doc/posix-headers/fcntl.texi
+++ b/doc/posix-headers/fcntl.texi
@@ -27,7 +27,13 @@
 mingw
 
 @item
-@samp{AT_FDCWD} and friends are provided by modules like openat.
+@samp{AT_FDCWD} is defined with a value too large for an int on some
+platforms:
+Solaris 10
+
+@item
+@samp{AT_FDCWD}, @samp{AT_SYMLINK_NOFOLLOW}, and @samp{AT_REMOVEDIR}
+are missing on some platforms.
 @end itemize
 
 Portability problems not fixed by Gnulib:
@@ -55,4 +61,7 @@
 @samp{POSIX_FADV_NORMAL}, @samp{POSIX_FADV_RANDOM},
 @samp{POSIX_FADV_SEQUENTIAL}, and @samp{POSIX_FADV_WILLNEED} are not
 defined on some platforms.
+
+@item
+@samp{AT_EACCESS} and @samp{AT_SYMLINK_FOLLOW} are missing on some platforms.
 @end itemize