[issue7523] add SOCK_NONBLOCK and SOCK_CLOEXEC to socket module

[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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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue7523>
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