Also if using signal 0 (zero) to poll processes how do you poll the group with a negative signal!?
I was going to suggest killpg() instead, but there are two problems with that: first, POSIX.pm doesn't have it (though it probably should, where available); second, SUSv3 documents killpg(pgrp, sig) as being the same as kill(-pgrp, sig) when sig is > 1 and undefined otherwise.

That leads me to suspect that polling a process group is considered an unuseful feature. What would it mean?

In reply to Re: kill(9, -9) or kill(-9, 9) ? by ysth
in thread kill(9, -9) or kill(-9, 9) ? by Pardus

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