readlinkat
==========

POSIX specification: http://www.opengroup.org/onlinepubs/9699919799/functions/readlinkat.html

Gnulib module: readlinkat

Portability problems fixed by Gnulib:

  * 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, Solaris 10, Cygwin 1.5.x, mingw, Interix 3.5, BeOS.

Portability problems not fixed by Gnulib:

  * This function always fails on platforms that don't support symlinks: mingw

  * When readlink is called on a directory: In the case of NFS mounted directories, Cygwin sets errno to ENOENT or EIO instead of EINVAL.  To avoid this problem, check for a directory before calling readlink.

  * When readlink is called on a file that is not a symbolic link: Irix may set errno to ENXIO instead of EINVAL.  Cygwin may set errno to EACCES instead of EINVAL.