How to clear zombie children while parent still alive.

[Michael I. Bushnell]

You clear zombie children *only* by exiting (clearly out) or by doing
a wait().  Ignoring SIGCHLD doesn't change that, nor arrange to have
init clean them up.  What you want to do is have a signal handler for
SIGCHLD that loops on wait3() (nonblocking) until there are no more
exited children to collect.

	-mib
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    Michael I. Bushnell      \     This above all; to thine own self be true
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   mike at unmvax.cs.unm.edu     /\   Thou canst not be false to any man.
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