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SubjectRe: Async IO
In, article <>,
Jared Mauch <> writes:
> Signal 0 checks to see if the process exists.
> If it does, it returns success, if it doesn't, it returns
> error.

If the process doesn't exist, it returns -1, errno == ESRCH.

If you aren't allowed to kill the process, you get EPERM.

If you are, you get zero.

All those things which are now held to be of the greatest antiquity,
were at one time new; and what we today hold up by example, will rank
hereafter as precedent.
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