How to tell if a forked process is done?

[Erik Max Francis]

Klaus Alexander Seistrup wrote:

> Anyway you look at it, killing blindly is bad programming practice.

But he's killing with a signal of 0.  From kill(2):

       If sig is 0, then no signal is sent, but error checking is
       still performed.

It's perfectly reasonable behavior to kill a process with a 0 signal; it
does no harm.

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