/** \brief Memif control file descriptor update (callback function)
@param fd - new file descriptor to watch
@param events - event type(s) to watch for
/** \brief Memif control file descriptor update (callback function)
@param fd - new file descriptor to watch
@param events - event type(s) to watch for
This callback is called when there is new fd to watch for events on
or if fd is about to be closed (user mey want to stop watching for events on this fd).
This callback is called when there is new fd to watch for events on
or if fd is about to be closed (user mey want to stop watching for events on this fd).