Path: utzoo!attcan!uunet!pdn!palan!sherpa!rac
From: rac@sherpa.UUCP (Roger Cornelius)
Newsgroups: comp.unix.xenix
Subject: Re: cu/uucp suspend/restart getty - how?
Message-ID: <275@sherpa.UUCP>
Date: 11 Jun 90 01:10:32 GMT
References: <1137@sixhub.UUCP>
Organization: Personal System Computing,  St. Petersburg, FL
Lines: 27

From article <1137@sixhub.UUCP>, by davidsen@sixhub.UUCP (Wm E. Davidsen Jr):
| In article <272@sherpa.UUCP> rac@sherpa.UUCP (Roger Cornelius) writes:
| | 
| | Can someone enlighten me as to how uucp and cu signal getty to suspend
| | and restart with SCO's HDB uucp?  I recall discussion here about
| | manually using SIGUSR1 and SIGUSR2 to accomplish this, but I'd like to
| | understand how cu/uucp do it (ie., from within a C program).
| 
|   Logic:
| 	-  Scan utmp for a getty. 
| 	-  Get the line # from the entry. 
| 	-  Send SIGUSR1 to the getty using kill(). 
| 	-  Use the line. 
| 	-  Send SIGUSR2 to the getty.

But the getty process is owned by root and cu/uucp are suid uucp.  How
can they kill the process (with kill())?  Either I'm missing something
or the above isn't correct (at least for cu/uucp - I agree it should
work for a process running as root).

So how can a process owned by uucp suspend/restart the getty?
-- 
Roger A. Cornelius          rac@sherpa.UUCP         uunet!sherpa!rac