Ensuring only one svscan per directory

[T\.]

We ran into a misconfiguration on one machine where svscan had been
added by one person to rc.sysinit and inittab by another, so two copies
of svscan were being started.

I realise that this is a misconfiguration, but wouldn't it be possible
for svscan to add a 'lock' file to the services directory so it only
starts once?  I'm not sure stale locks would be easy to detect since
svscan is usually a very low-numbered PID.

-- 
Michael T. Babcock
CTO, FibreSpeed