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stap vs pgrps


I won't recapitulate the entire explanation of job control here.
The basic reality is that if you are not implementing a job control
shell, then you should not be doing anything at all with pgrp magic.
This includes ever passing 0 as the first argument to kill.  For
something like stap that wants to be a "normal" tool--can be used
batch-style inside scripts, or can be used interactively with ^Z,
stty tostop, et al working normally--changing pgrps is right out.
Trust Me, this is not the can of droid worms you are looking for.

The full bugzilla history is now full of muddled conversations and
it's hard to sort through what the original real issues were.  Can
someone explain concisely what the real problem was that motivated
commit 8a3fc6c9, PR6030 in the first place?


Thanks,
Roland


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