How to get login shell pid's

[Dave Bloom]

Here's the story:

I'm writing my own version of "idledaemon" but I'd like a few suggestions from
the net. Namely, what's the best way to get the pid of a users login shell? The
SystemV command 'who -u' supplies the number, but I can't find anything in the
4.2 BSD universe that does the same. Any suggestions? Any idea how AT&T does
it in 'who', and can it be done similarly in 4.2 BSD?

Thanx.
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