STINNER Victor added the comment:

I don't understand why os.dup2() is more reliable than os.pipe() for a unit 
test?

Is subprocess_close-default-1.diff portable? test_os uses hasattr(os, "dup2"). 
In Modules/posixmodule.c, it looks like the function is always defined!?

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<http://bugs.python.org/issue18763>
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