subprocess hangs on reading stdout

Tim Arnold tim.arnold at sas.com
Thu Oct 15 18:39:34 CEST 2009


"Minesh Patel" <minesh at gmail.com> wrote in message 
news:mailman.1408.1255583431.2807.python-list at python.org...
> >
>> Any ideas? comments on code welcome also.
>
> Here's something that I would probably do, there may be better ways.
> This only works on python2.6 for the terminate() method.
>
>
> import signal
> import subprocess
>
> def timeout_handler(signum, frame):
>    print "About to kill process"
>    p.terminate()
>
> for machine_name in self.alive:
>    cmd = ["/bin/remsh", machine_name, 'ps -flu %s' % uid]
>    signal.signal(signal.SIGALRM, timeout_handler)
>    signal.alarm(1)
>    p = subprocess.Popen(cmd,stdout=subprocess.PIPE)
>    (stdout, stderr) = p.communicate()
>    signal.alarm(0)
>    if stdout:
>       print stdout
>    elif stderr:
>       print stderr
>
>
>
> -- 
> Thanks,
> --Minesh

Hi Minesh,
Looks like I need to learn about signals--that code looks nice. I'm using 
python2.6.
thanks,
--Tim Arnold





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