# Callback method on events: EOF, user-defined timeout and unrecoverable errors
	#
	# Returns `true` if the native handles to `self` can be released.
	fun event_callback(events: Int): Bool
	do
		if events & bev_event_error != 0 or events & bev_event_eof != 0 then
			if events & bev_event_error != 0 then
				var sock_err = evutil_socket_error
				# Ignore some normal errors and print the others for debugging
				if sock_err == 110 then
					# Connection timed out (ETIMEDOUT)
				else if sock_err == 104 then
					# Connection reset by peer (ECONNRESET)
				else
					print_error "libevent error event: {evutil_socket_error_to_string(sock_err)} ({sock_err})"
				end
			end
			force_close
			return true
		end

		return false
	end