readlink(2) claims:
Since Linux 2.6.39, pathname can be an empty string, in which case the
call operates on the file referred to by dirfd (which may have been
obtained using the open(2) O_PATH flag). In this case, dirfd can refer
to any type of file, not just a directory.
The last sentence seems to be incorrect. dirfd must refer to a symlink
that has been opened using the O_PATH flag. (The symlink could refer to
a file, directory, or nothing, but opening with O_PATH doesn't resolve
it.)
Ben.
--
Ben Hutchings
The two most common things in the universe are hydrogen and stupidity.
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