[issue1187] pipe fd handling issues in subprocess.py on POSIX

[Dustin J. Mitchell]

Dustin J. Mitchell <dustin at v.igoro.us> added the comment:

I see that, on running your fix_fileno.py, nothing is output to 
/tmp/stdout.test.  I don't necessarily see the link to your fix.  Could 
you describe the problem and/or add comments to your patch to explain why 
these checks are made?

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nosy: +djmitche

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