From: Roger Pack <lists@...>
Date: 2012-09-15T08:29:33+09:00
Subject: Re: IO#popen and exit status

>> not work either. I think io.close does already all the cleanup.
>
> $? can be used after close.
>
> I hope this documentation helps.

Just so there is no confusion for others that run into this since google 
brought me straight here, you can do:

a = IO.popen(process)
a.close
and $? will be set immediately after the call to close succeeds.

Process.waitpid is not necessary.

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