>> For my purposes I never want to change any process's state; I just
>> want the call to block until something is available that a similar
>> wait, without the flag bit, would return.
> Can't you use kqueue?

Only for exiting processes, using NOTE_EXIT (though it's not clear from
the manpage whether that refers to just exit(2)int processes or all
process deaths, regardless of reason).  I don't see any way to have
kqueue tell me about children stopping (or about processes dying on
signals, if NOTE_EXIT doesn't cover that).

It also requires asking for a NOTE_EXIT on each child individually,
which is somewhat ugly.

I also have some backward-compatability issues; it's a lot easier to
retrofit WNOREAP into an old kernel than it is to backport kqueue.
(This is not necessarily a reason for *NetBSD* to care, but it's a
reason *I* care.)

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