Re: fdopendir on non-directory

[Roland McGrath]

IMHO that behavior for file_name_lookup_under is clearly wrong,
and perhaps dangerously so.

The original point of using something that resolves to dir_lookup("/",...)
rather than a lookup of "." is that it should not require actual lookup
permission, but should still require that it be a directory.  So, if you
have an fd on which you don't have read or execute (lookup) permissions,
then fdopendir should fail with ENOTDIR rather than EACCES.


Thanks,
Roland