ev_io - is my file descriptor readable or writableev_io - is this file descriptor readable or writableev_timer - relative and optionally recurring timeoutsev_periodic - to cron or not to cron itev_signal - signal me when a signal gets signalledev_io - is my file descriptor readable or writableev_io - is this file descriptor readable or writableI/O watchers check whether a file descriptor is readable or writable in each iteration of the event loop (This behaviour is called level-triggering because you keep receiving events as long as the