[issue10115] Support accept4() for atomic setting of flags at socket creation

[Vetoshkin Nikita]

Vetoshkin Nikita <nikita.vetoshkin at gmail.com> added the comment:

Started implementing accept4() socket method and stuck on socket object's timeout attribute. What value should we assign to sock->sock_timeout if SOCK_NONBLOCK was specified in accept4() call? And in socket.py should we check as in original accept:
if getdefaulttimeout() is None and self.gettimeout():
   sock.setblocking(True)

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<http://bugs.python.org/issue10115>
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