PID management with popen and spawn

Gabriel Genellina gagsl-py2 at
Tue Sep 30 08:16:11 CEST 2008

En Thu, 25 Sep 2008 12:36:00 -0300, EEK <eekfunster at> escribió:

>  My goal is to start and stop separate Linux processes from a python
> program by specific PID.  The output of these processes needs to have
> their stderr and stdout piped to a particular file, respectively.
>  I've been able to make this work with subprocess.Popen only if the
> shell variable is set to False but I cannot pipe the outputs of the
> targets.
>  When using subprocess.Popen with shell=True, I believe the returned
> PID is of the shell that opens the target process, not the target
> process itself.  Therfore, I cannot stop the target process for the
> returned PID is not of that process.


>  prgm = program I want to run (compiled C)
>  logfile = file I want to pipe output to
>  What I need to do based on a simple shell call:  program >& logfile
> (yes, that's it)

Use the stdout and stderr arguments. Something like this (untested):

f = open(logfile, "w")
proc = subprocess.Popen(["program","with","arguments"], stdout=f, stderr=f)

Gabriel Genellina

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