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

[STINNER Victor]

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

Since the commit c9207c6ce24a, test_signal fails on OpenIndiana:

http://www.python.org/dev/buildbot/all/builders/x86%20OpenIndiana%203.x/builds/1179
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ERROR: test_block_unlock (test.test_signal.PthreadSigmaskTests)
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Traceback (most recent call last):
  File "/export/home/buildbot/64bits/3.x.cea-indiana-amd64/build/Lib/test/test_signal.py", line 539, in test_block_unlock
    self.assertEqual(set(old_mask) ^ set(blocked), {signum})
  File "/export/home/buildbot/64bits/3.x.cea-indiana-amd64/build/Lib/test/test_signal.py", line 501, in handler
    1/0
ZeroDivisionError: division by zero

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<http://bugs.python.org/issue8407>
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