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Date: Fri, 2 Mar 2012 12:22:41 -0800
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Subject: Re: Python - CGI-BIN - Apache Timeout Problem
From: Chris Rebert <clp2@rebertia.com>
To: "Sean Cavanaugh (scavanau)" <scavanau@cisco.com>
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Xref: csiph.com comp.lang.python:21147

On Fri, Mar 2, 2012 at 12:09 PM, Sean Cavanaugh (scavanau)
<scavanau@cisco.com> wrote:
<snip>
> THE PROBLEM:
>
> When I execute the scripts from the command line (#python main.py) it
> generates it fine (albeit slowly), it prints all the html code out includ=
ing
> the script.=C2=A0 The =E2=80=98core=E2=80=99 part of the script dumbed do=
wn to the lowest level
> is->
>
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 proc =3D subprocess.Popen(['/u=
sr/local/bin/python', 'tests.py'],
> stdout=3Dsubprocess.PIPE)
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 output =3D proc.stdout.read()

Note the red warning box about possible deadlock with .stdout.read()
and friends:
http://docs.python.org/library/subprocess.html#popen-objects

> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 print output
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 proc.stdout.close()

As the docs advise, try using .communicate()
[http://docs.python.org/library/subprocess.html#subprocess.Popen.communicat=
e
] instead:
    proc =3D subprocess.Popen(=E2=80=A6)
    out, err =3D proc.communicate()
    print out

> When I open main.py and execute the script it just hangs=E2=80=A6 it seem=
s to
> execute the script (I see pcap fires on the interface that I am testing o=
n
> the firewall) but its not executing correctly=E2=80=A6 or loading the ent=
ire
> webpage=E2=80=A6the webpage keeps chugging along and eventually gives me =
an error
> timeout.

The hanging makes me suspect that the aforementioned deadlock is occurring.

Cheers,
Chris
--
http://chrisrebert.com