From: utzoo!decvax!cca!sdyer@Bbn-Unix@sri-unix
Newsgroups: net.unix-wizards
Title: getlogin foolery
Article-I.D.: sri-unix.3085
Posted: Fri Sep  3 19:07:35 1982
Received: Wed Sep  8 05:51:25 1982

From: Steve Dyer 
Date: 31 Aug 1982 12:00:39 EDT (Tuesday)

At Harvard, we implemented the concept of "login uid" which was
independent of the real or effective uid.  We added two new system
calls which set/retrieved the user's login uid.  (It did a bit
more than Dennis Ritchie's reference to adding a u.u_luid field,
but functionally it had the same effect.)  "login" set the luid
before execing the user's shell.  Worked fine--just the thing for
for privileged programs which have to run in a hostile (read,
student) environment.

/Steve Dyer