[issue8407] expose signalfd(2) and pthread_sigmask in the signal module

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

> http://bugs.python.org/review/8407/show

Updated patch (version 2).

Note: sigpending() doesn't return an error code but -1 on error.

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Added file: http://bugs.python.org/file21901/pending_signals-2.patch

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