[issue28884] Python 3.5.2 non-segfaulting bugs (from PyPy)

[Armin Rigo]

Armin Rigo added the comment:

(B1) on modern Linux: if the first call in the process to
  socketpair() ends in a EINVAL, then cpython will (possibly wrongly)
  assume it was caused by SOCK_CLOEXEC and not use SOCK_CLOEXEC at all
  in the future

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28884>
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