static int if_ppp_open __P((queue_t *, int, int, int));
static int if_ppp_close __P((queue_t *, int));
static int if_ppp_wput __P((queue_t *, mblk_t *));
static int if_ppp_open __P((queue_t *, int, int, int));
static int if_ppp_close __P((queue_t *, int));
static int if_ppp_wput __P((queue_t *, mblk_t *));