[issue2320] Race condition in subprocess using stdin

[Terry J. Reedy]

Changes by Terry J. Reedy <tjreedy at udel.edu>:


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stage:  -> unit test needed
versions: +Python 2.7, Python 3.2 -Python 2.5, Python 2.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue2320>
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