[issue12607] subprocess(stdout=..., stderr=sys.stdout) breaks stderr for child

[Ross Lagerwall]

Ross Lagerwall <rosslagerwall at gmail.com> added the comment:

It is indeed a problem.

It seems like the problem comes about due to the "swapping" of fds.
i.e. using stdout as stderr. The reverse appears to work due to the order in which the dup() calls are performed.

Attached is a patch which fixes the issue.

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keywords: +patch
nosy: +rosslagerwall
Added file: http://bugs.python.org/file22716/i12607.patch

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