[issue7523] add SOCK_NONBLOCK and SOCK_CLOEXEC to socket module

[Vetoshkin Nikita]

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

Thanks! I can see the problem now, but I think checking should be done like this:
>>> fcntl.fcntl(c, fcntl.F_GETFD) & fcntl.FD_CLOEXEC
0
>>> fcntl.fcntl(s, fcntl.F_GETFD) & fcntl.FD_CLOEXEC
1
and with accept4() call I've got flag set:
>>> fcntl.fcntl(c, fcntl.F_GETFD) & fcntl.FD_CLOEXEC
1
>>> fcntl.fcntl(s, fcntl.F_GETFD) & fcntl.FD_CLOEXEC
1

Don't know how to properly check if accept4 is available.

Second attempt - dropping flags from sock_type should be done on Python level in socket.py and I don't quite like idea to check if SOCK_CLOEXEC is in locals every time.

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Added file: http://bugs.python.org/file19206/issue7523_py3k_accept4.diff

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