tun_unit           97 net/if_tun.c   	int		tun_unit;
tun_unit          174 net/if_tun.c   	tp->tun_unit = unit;
tun_unit          257 net/if_tun.c   		if (tp->tun_unit == unit)
tun_unit          272 net/if_tun.c   	unit = tp->tun_unit;