Function tun_destroy

freebsd/net/if_tuntap.c:616–649

}

static void
tun_destroy(struct tuntap_softc *tp)
{

	TUN_LOCK(tp);
	tp->tun_flags |= TUN_DYING;
	if (tp->tun_busy != 0)
		cv_wait_unlock(&tp->tun_cv, &tp->tun_mtx);
	else
		TUN_UNLOCK(tp);

	CURVNET_SET(TUN2IFP(tp)->if_vnet);

	/* destroy_dev will take care of any alias. */
	destroy_dev(tp->tun_dev);
	seldrain(&tp->tun_rsel);
	knlist_clear(&tp->tun_rsel.si_note, 0);
	knlist_destroy(&tp->tun_rsel.si_note);
	if ((tp->tun_flags & TUN_L2) != 0) {
		ether_ifdetach(TUN2IFP(tp));
	} else {
		bpfdetach(TUN2IFP(tp));
		if_detach(TUN2IFP(tp));
	}
	sx_xlock(&tun_ioctl_sx);
	TUN2IFP(tp)->if_softc = NULL;
	sx_xunlock(&tun_ioctl_sx);
	free_unr(tp->tun_drv->unrhdr, TUN2IFP(tp)->if_dunit);
	if_free(TUN2IFP(tp));
	mtx_destroy(&tp->tun_mtx);
	cv_destroy(&tp->tun_cv);
	free(tp, M_TUN);
	CURVNET_RESTORE();
}

static int
tun_clone_destroy(struct if_clone *ifc __unused, struct ifnet *ifp)