From: James Dinkel <jdinkel@...>
Date: 2008-09-27T03:58:59+09:00
Subject: Re: popen3 mysteriously hangs

Ara Howard wrote:
> 
> you are clogging the buffer with stdout and so the child process goes
> to sleep.  you have to use some caution getting both stdout and stderr
> from a child process because a full buffer for either will block the
> child.  probably the simplest way to do what you want is
> 
>    gem install systemu
> 
> 
>    stdout, stderr, status = systemu command
> 
> 
> this also works on windows  if you need to handle the output in
> realtime try using open4 (gem install open4) as it abstracts that
> threaded reading for you.
> 

I don't need realtime output, I just need the output when it's all done. 
Is there any way to flush stdout and stderr while the program is 
running?  I really only need the last 50 lines or so of stdout and only 
the very last line of stderr.

I'll have a look at systemu, too.  Thanks.
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