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/asterisk/trunk/lib/python/asterisk/sippversion.py
<https://reviewboard.asterisk.org/r/3258/#comment20564>

    The problem you mentioned would only occur when both stdout and stderr have 
their own pipe.
    
    Like this:
    
    >>> x = Popen('(seq 100000 >&2; seq 10)', shell=True, stdout=PIPE, 
stderr=PIPE)
    >>> for y in x.stdout:
    ...     print y
    ... 
    (infinite wait)
    
    In the above case, stderr is redirected to stdout, so that problem doesn't 
occur.
    
    However, the process is never reaped.
    
    An:
    
        sipp_process.wait()
    
    should take care of that.


- wdoekes


On Feb. 24, 2014, 5:55 p.m., Scott Griepentrog wrote:
> 
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> https://reviewboard.asterisk.org/r/3258/
> -----------------------------------------------------------
> 
> (Updated Feb. 24, 2014, 5:55 p.m.)
> 
> 
> Review request for Asterisk Developers.
> 
> 
> Repository: testsuite
> 
> 
> Description
> -------
> 
> While running the testsuite I noticed it would occasionally fail to start, 
> complaining of being unable to kill sipp (code introduced svn r4677 and 
> https://reviewboard.asterisk.org/r/3198/).  I tracked this back to an 
> instance of sipp that was used to check the version number, and revised the 
> method used to read the stdout per python manual "Warning Use communicate() 
> rather than .stdin.write, .stdout.read or .stderr.read to avoid deadlocks due 
> to any of the other OS pipe buffers filling up and blocking the child 
> process.".  The version check process was then cleanly terminated before 
> checking for sipp instances leftover from a previous test run via pidof sipp.
> 
> NOTE: other instances where popen.stdout is used may exist in the testsuite 
> that could be causing similar random issues.
> 
> 
> Diffs
> -----
> 
>   /asterisk/trunk/lib/python/asterisk/sippversion.py 4735 
> 
> Diff: https://reviewboard.asterisk.org/r/3258/diff/
> 
> 
> Testing
> -------
> 
> 
> Thanks,
> 
> Scott Griepentrog
> 
>

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