[issue19017] selectors: towards uniform EBADF handling

[Antoine Pitrou]

Antoine Pitrou added the comment:

> Another possibility would be to silently fix those, i.e. in case of
> EBADF/POLLNVAL in select/poll, remove the offending FD from the list of
> monitored FDs.

Or we could remove the fd *and* still raise an error the first time, or at least a warning. It sounds like a programming error, so I'm not sure it's a good idea to silence it.

Note that Twisted still logs an error message. Also, Tornado lets errors through:
https://github.com/facebook/tornado/blob/master/tornado/ioloop.py#L652
https://github.com/facebook/tornado/blob/master/tornado/platform/select.py#L61

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