popen breaks input channel for IRB
----------------------------------

                 Key: JRUBY-3405
                 URL: http://jira.codehaus.org/browse/JRUBY-3405
             Project: JRuby
          Issue Type: Bug
          Components: Core Classes/Modules
    Affects Versions: JRuby 1.1.6
            Reporter: Charles Oliver Nutter
             Fix For: JRuby 1.2


This is pretty ugly. After doing an IO.popen("sleep 60") in IRB, the console 
becomes nearly unresponsive. Only a few characters get through, and only after 
pressing the key several times. I'm not sure what's going on, but 1.1.6 behaves 
the same way and we need to fix it for 1.2.

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