ucred_getlabel
if ((clabel = ucred_getlabel(uc)) == NULL) {
sl = ucred_getlabel(uc);
extern bslabel_t *ucred_getlabel(const ucred_t *);
if (ucred_getlabel(uc) != NULL) {
(void) m_label_dup(&ul, ucred_getlabel(uc));
token = au_to_label(ucred_getlabel(uc));