rctl_entity_obtain_rset
rset = rctl_entity_obtain_rset(rde, p);
if (rctl_entity_obtain_rset(rde, rp) == rset) {
rctl_set_t *rctl_entity_obtain_rset(rctl_dict_entry_t *, struct proc *);
if ((rset = rctl_entity_obtain_rset(krde, curproc)) == NULL) {