From: utzoo!decvax!harpo!seismo!stewart Newsgroups: net.unix-wizar Title: Re: root executing setuid programs Article-I.D.: seismo.190 Posted: Thu Jan 6 10:43:51 1983 Received: Fri Jan 7 02:51:25 1983 This is a followup to Randy Bentson's article about daemons running as root. It is true that programs run by superuser can not set lock files by simply trying to create a file with no permissions. Look at the lock mechanisms used in uucico. The locking mechanism there is to link to a file. If the file exists, the link call will fail, even for superuser. John Stewart, Teledyne Geotech (Alexandria, VA) 703-276-7900