[issue12981] rewrite multiprocessing (senfd|recvfd) in Python

[Charles-François Natali]

Changes by Charles-François Natali <neologix at free.fr>:


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dependencies:  -_XOPEN_SOURCE and _XOPEN_SOURCE_EXTENDED usage on Solaris
resolution:  -> fixed
stage:  -> committed/rejected

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue12981>
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