cu/uucp suspend/restart getty - how?

[Roger Cornelius]

>From article <1137 at sixhub.UUCP>, by davidsen at sixhub.UUCP (Wm E. Davidsen Jr):
| In article <272 at sherpa.UUCP> rac at 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 at sherpa.UUCP         uunet!sherpa!rac