From: utzoo!henry Newsgroups: hacknews Title: login(1) fixed Article-I.D.: utzoo.2419 Posted: Wed Aug 25 17:50:05 1982 Received: Wed Aug 25 17:50:05 1982 Figured out a way to test whether login(1) is being invoked from the top level or not: testing whether its parent is process #1 is not quite 100% right, but close enough for all practical purposes. Changed login to refuse to cooperate if getppid() != 1. Took the opportunity to do some minor cleanup in the code and check usage a bit more closely.