TCPT_KEEP
TCP_TIMER_ARM(tp, TCPT_KEEP,
TCP_TIMER_ARM(tp, TCPT_KEEP, atomic_load_int(&tcp_keepidle));
TCP_TIMER_ARM(tp, TCPT_KEEP, atomic_load_int(&tcp_keepinit));
TCP_TIMER_ARM(tp, TCPT_KEEP, atomic_load_int(&tcp_keepidle));
if (tcp_timer_enter(inp, &so, &tp, TCPT_KEEP))
TCP_TIMER_ARM(tp, TCPT_KEEP, keepintvl);
TCP_TIMER_ARM(tp, TCPT_KEEP, atomic_load_int(&tcp_keepidle));
tcp_trace(TA_TIMER, ostate, tp, otp, NULL, TCPT_KEEP, 0);
TCP_TIMER_ARM(tp, TCPT_KEEP, atomic_load_int(&tcp_keepinit));