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kqueue API: filter flags
EV_ADD, EV_DELETE: put and remove a filter
EV_ENABLE, EV_DISABLE: activate and disactivate a filter
EV_ONESHOT: when event occurs, remove filter
EV_CLEAR: reset event when user retrieves it
EV_EOF: set by filters to report EOF alike conditions
EV_ERROR: set by filters to report error conditions
Notes: