-int persona_set_groups(struct persona *persona, gid_t *groups, unsigned ngroups, uid_t gmuid);
-int persona_get_groups(struct persona *persona, unsigned *ngroups, gid_t *groups, unsigned groups_sz);
+int persona_set_groups(struct persona *persona, gid_t *groups, size_t ngroups, uid_t gmuid);
+int persona_get_groups(struct persona *persona, size_t *ngroups, gid_t *groups, size_t groups_sz);