TUN_NBIO          273 net/if_tun.c   	open = tp->tun_flags & (TUN_OPEN|TUN_NBIO|TUN_ASYNC);
TUN_NBIO          350 net/if_tun.c   	tp->tun_flags &= ~(TUN_OPEN|TUN_NBIO|TUN_ASYNC);
TUN_NBIO          652 net/if_tun.c   			tp->tun_flags |= TUN_NBIO;
TUN_NBIO          654 net/if_tun.c   			tp->tun_flags &= ~TUN_NBIO;
TUN_NBIO          737 net/if_tun.c   			if (tp->tun_flags & TUN_NBIO && ioflag & IO_NDELAY) {