[issue32038] Add API to intercept socket.close()

[Yury Selivanov]

Yury Selivanov <yselivanov at gmail.com> added the comment:

> Oh, sock._decref_socketios() must be uesd here to really close the socket if it was closed in the meanwhile:

There's also 'sock._closed' attribute that sock.close() and sock. _decref_socketios() interact with.. Alright, let me play with this in uvloop.  So far it looks like we don't need any new APIs :)

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<https://bugs.python.org/issue32038>
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