Function tun_create_device

freebsd/net/if_tuntap.c:795–833

MODULE_VERSION(if_tap, 1);

static int
tun_create_device(struct tuntap_driver *drv, int unit, struct ucred *cr,
    struct cdev **dev, const char *name)
{
	struct make_dev_args args;
	struct tuntap_softc *tp;
	int error;

	tp = malloc(sizeof(*tp), M_TUN, M_WAITOK | M_ZERO);
	mtx_init(&tp->tun_mtx, "tun_mtx", NULL, MTX_DEF);
	cv_init(&tp->tun_cv, "tun_condvar");
	tp->tun_flags = drv->ident_flags;
	tp->tun_drv = drv;

	make_dev_args_init(&args);
	if (cr != NULL)
		args.mda_flags = MAKEDEV_REF;
	args.mda_devsw = &drv->cdevsw;
	args.mda_cr = cr;
	args.mda_uid = UID_UUCP;
	args.mda_gid = GID_DIALER;
	args.mda_mode = 0600;
	args.mda_unit = unit;
	args.mda_si_drv1 = tp;
	error = make_dev_s(&args, dev, "%s", name);
	if (error != 0) {
		free(tp, M_TUN);
		return (error);
	}

	KASSERT((*dev)->si_drv1 != NULL,
	    ("Failed to set si_drv1 at %s creation", name));
	tp->tun_dev = *dev;
	knlist_init_mtx(&tp->tun_rsel.si_note, &tp->tun_mtx);
	mtx_lock(&tunmtx);
	TAILQ_INSERT_TAIL(&tunhead, tp, tun_list);
	mtx_unlock(&tunmtx);
	return (0);
}

static void
tunstart(struct ifnet *ifp)