>> getppid actually does not qualify, since the parent can die, and the
>> ppid thus change to 1, without libc having a chance to notice.
> Well, this can be handled with an appropriate kevent and some kernel
> magic -- though I would not necessarily advocate that for NetBSD's
> libc.

Can kevents generate signal/AIO-style callbacks?  If not, then all
you've done in that case is traded a cheap syscall (getppid) for a
substantially more expensive syscall (kevent)...or was the "kernel
magic" you refer to something that would cure that?

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