putctl4
extern int putctl4(queue_t *, uchar_t, uchar_t, uint16_t);
(void) putctl4(ppa->ppa_lower_wq, M_CTL, PPPCTL_MRU,
(void) putctl4(ppa->ppa_lower_wq, M_CTL, PPPCTL_MTU,
(void) putctl4(lwq, M_CTL, PPPCTL_MRU, ppa->ppa_mru);
(void) putctl4(lwq, M_CTL, PPPCTL_MTU, ppa->ppa_mtu);