Detecting share violations over cifs with PHP? Feature request

Hi. I hope this has been sent to the right place. I am using files that are mount.cif share files. My client is a samba linux box but acting as a client over cifs to an XP box (several in fact). I am descending the share recursively with opendir and readdir detecting files ( and of course directories ) before doing my processing. I note from a wireshark trace I am getting errors - sharing violations reported by XP. I would very much like to detect these events to take action - ignore the file for instance - but right now I have a true or false return from readdir, is_dir, is_file or is_link which is not very helpful during a fault condition such as a sharing violation. In other words a sharing violation looks like a readdir saying no more files! It seems that once the error condition comes about all my reads of a directory and tests of file types fail until I reach the end of that directory and all of its parent directories. This is not so good. Am I missing a trick here? If not is it possible to bring out more error information so that I can detect these events. An error array as an additional overloaded argument to readdir, opendir (indeed any I/O) where the first element has the normal true/false perhaps but a second element has a return code for smb/cifs/file_system failure/error/warning condition? Thanks Ian