[docs] [issue19876] selectors (and asyncio?): document behaviour on closed files/sockets

[Guido van Rossum]

Guido van Rossum added the comment:

So I think this is why epoll doesn't raise OSError:

http://hg.python.org/cpython/file/44dacafdd48a/Modules/selectmodule.c#l1335

The Python wrapper explicitly checks for EBADF and turns this into a non-error result.

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