HAST_KEEPALIVE
QUEUE_TAKE1(hio, send, ncomp, HAST_KEEPALIVE);
if (lastcheck + HAST_KEEPALIVE <= now) {
timeout.tv_sec = HAST_KEEPALIVE;
if (lastcheck + HAST_KEEPALIVE <= now) {
if (proto_timeout(res->hr_remotein, 2 * HAST_KEEPALIVE) == -1)