How to tell if a forked process is done?
Klaus Alexander Seistrup
spam at magnetic-ink.dk
Wed Sep 24 08:27:41 CEST 2003
François Pinard wrote:
> In the less usual case you want concurrency between Python and the
> forked shell command, for only later checking if the forked process
> is done, the usual way is to send a zero signal to the child using
> `os.kill()'. The zero signal would not do any damage in case your
> forked process is still running. But if the process does not exist,
> the parent will get an exception for the `os.kill()', which you may
> intercept. So you know if the child is running or finished.
This will yield a false positive and potential damage if the OS has
spawned another process with the same pid, and running under your uid,
as the task you wanted to supervise.
><> unselfish actions pay back better
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