telldir DIRHANDLE
This function returns the current position of the readdir routines on DIRHANDLE
.
This value may be given to seekdir to access
a particular location in a directory. The function has the same caveats about
possible directory compaction as the corresponding system library routine. This
function may not be implemented everywhere that readdir is. Even if it is, no calculation may be done with
the return value. It's just an opaque value, meaningful only to seekdir.