[issue12304] expose signalfd(2) in the signal module

[STINNER Victor]

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

#8407 changed the wakeup fd: it now contains the signal number. pthread_sigmask() is now part of Python 3.3 (see also #8407).

signalfd() has advantages over the wakeup fd (msg103326):

 - it is handled in the kernel, the process is not interrupted. For example, system calls cannot fail with EINTR.
 - it gives much more information than the signal number (see signalfd_siginfo structure)
 - it is also possible to have several signalfds, each with a different signal mask. set_wakeup_fd is limited to a single fd per-process.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue12304>
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