kauth_cred_getgroups
kauth_cred_getgroups(cred, uuc->cr_groups, ng, UIO_SYSSPACE);
kauth_cred_getgroups(p->p_cred, ki->p_groups,
return kauth_cred_getgroups(l->l_cred, SCARG(uap, gidset), *retval,
int kauth_cred_getgroups(kauth_cred_t, gid_t *, size_t, enum uio_seg);