MAXWAIT
if (secs > MAXWAIT)
if (alarm(MAXWAIT) < 0) {
static int waittime = MAXWAIT; /* timeout for each packet */
static int waittime = MAXWAIT; /* timeout for each packet */
if (MAXWAIT > 0 && (t - tref) >= MAXWAIT) {
#ifndef MAXWAIT
#if MAXWAIT < 0