PRIV_CRED_SETUID
if (priv_check(td, PRIV_CRED_SETUID) ||
case PRIV_CRED_SETUID:
(error = priv_check_cred(oldcred, PRIV_CRED_SETUID)) != 0)
priv_check_cred(oldcred, PRIV_CRED_SETUID) == 0)
case PRIV_CRED_SETUID:
case PRIV_CRED_SETUID: