subprocess help

[Влатко Станковиќ]

>
>
>
> ---------- Forwarded message ----------
>> From: Steven D'Aprano <steve+comp.lang.python at pearwood.info>
>> To: python-list at python.org
>> Cc:
>> Date: 16 Apr 2014 12:06:16 GMT
>> Subject: Re: subprocess help
>> On Wed, 16 Apr 2014 12:47:03 +0200, Влатко Станковиќ wrote:
>> > Hello,
>> > I'm having some sort of 'problem' when using subprocess calls. This is
>> > the code snipet that i am using:
>> >
>> > capture_server1 = '''xvfb-run --auto-servernum ... '''
>> > server1_download = subprocess.Popen(shlex.split(capture_server1),
>> >                                     stdin=subprocess.PIPE,
>> >                                     stdout=subprocess.PIPE,
>> >                                     stderr=subprocess.PIPE)
>> >
>> > out_s1, err_s1 = server1_download.communicate()
>> > time.sleep(2)
>> What's the difference between the server1 code (shown above) and the
>> server2 code (not shown, but identical as far as I can tell)?
>> You have to identify what files are remaining open. What does the xvfb-
>> run process do? What are the rest of the arguments?
>> My guess is that, depending on the arguments, sometimes xvfb-run leaves
>> files open even after the process terminates. You should monitor the open
>> files with lsof which is available on most Linux systems. I don't know
>> how to do that on other operating systems.
>> My guess is that, depending on the arguments, sometimes xvfb-run leaves
>> files open even after the process terminates. You should monitor the open
>> files with lsof which is available on most Linux systems. I don't know
>> how to do that on other operating systems.
>> --
>> Steven
>
>
>  --

https://mail.python.org/mailman/listinfo/python-list


 xvfb-run accepts some parameters and calls CutyCapt with parameters for it
The command is this:

xvfb-run --auto-servernum --server-num=55 --server-args "-screen 0,
> 1024x768x24" {0} --url="{1}" --private-browsing=on --out={2}


So server1, opens a process with CutyCapt which points to server1
address/url, does its thing and saves the result in out
Server2 in the other hand has a different address/url, different
server-num, and different out

As a workarround i've added close_fds=True, preexec_fn=os.setsid, and
after communicate(), i am doing os.killpg(server1.pid, signal.SIGUSR1)

Although i am not sure if this will work 100% because i have to wait X days
until something crashes

Any ideas are welcomed

P.S. After adding os.killpg, lsof and ps aux dont show more than 4 or 5
xvfb and cutycapt processes while running

Thanks and Regards
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/python-list/attachments/20140417/3f75f5d6/attachment.html>