----
Constants:

* `LEAVE` - When returned will cause event callback to be cancelled
* `EV_READ`
* `EV_WRITE`
* `EV_TIMEOUT`
* `EVBUFFER_READ`
* `EVBUFFER_WRITE`
* `EVBUFFER_EOF`
* `EVBUFFER_ERROR`
* `EVBUFFER_TIMEOUT`

Functions:

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