[issue30844] selectors: Add exceptional urgent data event

[STINNER Victor]

STINNER Victor added the comment:

I don't know anything about OOB data, so I continue to add more pointers :-)

https://en.wikipedia.org/wiki/Out-of-band_data

"Out of band data is a logically independent transmission channel between a pair of connected stream sockets."

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30844>
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