PRIV_PRPRIV_SIZE
prsz = PRIV_PRPRIV_SIZE(old_prpriv);
sz = PRIV_PRPRIV_SIZE(ppriv);
int sz = PRIV_PRPRIV_SIZE(pr);
end = (char *)pr + PRIV_PRPRIV_SIZE(pr);
sz = PRIV_PRPRIV_SIZE(pprv) + sizeof (long);
(void) memcpy(&ctl[1], pprv, PRIV_PRPRIV_SIZE(pprv));
pprivsz = PRIV_PRPRIV_SIZE(ppriv);