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A comment on The right way to deal with frozen processes on Unix. Parent comment

Re:The right way to deal with frozen processes on Unix by unixnoob on Sunday September 23, 2012 @04:04AM (#4560367)
But won't all the processes in my example have the PGID of sh?
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Re:The right way to deal with frozen processes on Unix by FooBarWidget on Sunday September 23, 2012 @02:49PM (#4561687)
Yes they do, but that is irrelevant. kill(pid) kills the process specified by 'pid'. kill(-pid) kills the process group specified by 'pid'.
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Re:The right way to deal with frozen processes on Unix by unixnoob on Sunday September 23, 2012 @04:48PM (#4561985)
What if I just use userland kill(1) utility? Is it possible to kill all processes under a PGID using kill(1)?

Say the PGID I get for sh is 321. If I do

    kill [signal] 321
that will not kill all the processes having PGID 321?

If it would not kill them, then couldn't we modify kill(1) to be able to call kill() with a negative integer as you describe?

Sorry for the noob questions. I am still learning and making mistakes.

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