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    <p>Here is something I wrote as a watchdog for subprocess execution. I use it now a lot, but I'm not so experienced so maybe there are some flaws in it:</p> <pre><code>import subprocess import time def subprocess_execute(command, time_out=60): """executing the command with a watchdog""" # launching the command c = subprocess.Popen(command) # now waiting for the command to complete t = 0 while t &lt; time_out and c.poll() is None: time.sleep(1) # (comment 1) t += 1 # there are two possibilities for the while to have stopped: if c.poll() is None: # in the case the process did not complete, we kill it c.terminate() # and fill the return code with some error value returncode = -1 # (comment 2) else: # in the case the process completed normally returncode = c.poll() return returncode </code></pre> <p>Usage:</p> <pre><code> return = subprocess_execute(['java', '-jar', 'some.jar']) </code></pre> <p>Comments:</p> <ol> <li>here, the watchdog time out is in seconds; but it's easy to change to whatever needed by changing the <code>time.sleep()</code> value. The <code>time_out</code> will have to be documented accordingly;</li> <li>according to what is needed, here it maybe more suitable to raise some exception.</li> </ol> <p>Documentation: I struggled a bit with the documentation of <code>subprocess</code> module to understand that <code>subprocess.Popen</code> is not blocking; the process is executed in parallel (maybe I do not use the correct word here, but I think it's understandable).</p> <p>But as what I wrote is linear in its execution, I really have to wait for the command to complete, with a time out to avoid bugs in the command to pause the nightly execution of the script.</p>
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    1. POKill or terminate subprocess when timeout?
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    1. USJoël
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