fork timing hole and runaway children

[Ken Lalonde]

Every term, at least one student writes one of those charming programs
like "for (;;) fork();".  Shooting them manually is tiresome and
sometimes impossible if the cancer has spread, so we added a new system
call:
	zonk(uid, signal)
Sends the given signal to all processes owned by uid, returning a count
of the number of processes found.  You can type "zonk fool" to send
SIGKILL to all of fool's processes.

If there is interest, I'll post the code.