TUN_STAYUP        175 net/if_tun.c   	tp->tun_flags = TUN_INITED|TUN_STAYUP;
TUN_STAYUP        316 net/if_tun.c   		tp->tun_flags &= ~TUN_STAYUP;
TUN_STAYUP        362 net/if_tun.c   	if (!(tp->tun_flags & TUN_STAYUP))