kqueue: set proper errno for no threadpool, handle errnos properly #57
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Fixes #54
This fixes a few issues:
When an operation requesting a threadpool is registered with a loop that has no threadpool, we set the result to EPERM. We were forgetting to negate the result so we were seeing it as a success.
We used
errno()
to process results, but for manually constructed errnos (like the above), we'd read an invalid value because we don't actually set the errno threadlocal... and don't want to.We didn't have cancellation and permission denied as part of the error sets because we never hit them! Now we do! As we should.