need_holdoff = 0;
check_idle(arg)    caddr_t arg;{    struct ppp_idle idle;    time_t itime;    if (!get_idle_time(0, &idle))	return;    itime = MIN(idle.xmit_idle, idle.recv_idle);    if (itime >= idle_time_limit) {	/* link is idle: shut it down. */	syslog(LOG_INFO, "Terminating connection due to lack of activity.");	lcp_close(0, "Link inactive");    } else {	TIMEOUT(check_idle, NULL, idle_time_limit - itime);    }}