using subprocess for non-terminating command

zacherates zacherates at
Wed Jul 4 14:09:03 CEST 2007

> How should I handle these kind of commands (ping with
> subprocess module. I am using subprocess, instead of os.system because
> at anypoint in time, I need access to stdout and stderr of execution.

Ping, for one, allows you to set an upper bound on how long it runs
(the -c option).  This is probably the cleanest approach if it's

You can also send the subprocess signals if you need it to exit
(although, this is a unix thing so I'm not sure how portable it is).
You could emulate having a timeout on by registering
a callback with Timer to kill the child.


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