[issue18643] implement socketpair() on Windows

[STINNER Victor]

STINNER Victor added the comment:

> Victor, did you have a chance to test the patch?

I tested socketpair.diff (modified to use it even on Linux) on another computer, and test ran successfully.

On my main computer (Fedora 18, Linux kernel 3.9.4), the test is failing. With sendall_write.diff, the test does pass. test.support.PIPE_MAX_SIZE=4194305 (4 MB) on this computer. I don't know for the other one.

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<http://bugs.python.org/issue18643>
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