POSIX specification: @url{http://www.opengroup.org/onlinepubs/9699919799/functions/fdopendir.html}
-Gnulib module: openat
+Gnulib module: fdopendir
Portability problems fixed by Gnulib:
@itemize
This function is missing on some platforms:
glibc 2.3.6, MacOS X 10.3, FreeBSD 6.0, NetBSD 3.0, OpenBSD 3.8, AIX
5.1, HP-UX 11, IRIX 6.5, OSF/1 5.1, Cygwin 1.5.x, mingw, Interix 3.5, BeOS.
-But the replacement function is not safe to be used in libraries and is not multithread-safe.
+But the replacement function is not safe to be used in libraries and
+is not multithread-safe. Also, the replacement does not guarantee
+that @samp{dirfd(fdopendir(n))==n} (dirfd might fail, or return a
+different file descriptor than n).
+@item
+This function does not reject non-directory file descriptors on some
+platforms:
+GNU/Hurd.
@end itemize
Portability problems not fixed by Gnulib: