#ifdef notyet
int (*d_open) __P((dev_t dev, int ifmt, int, struct proc *));
int (*d_close) __P((dev_t dev, int, int ifmt, struct proc *));
#ifdef notyet
int (*d_open) __P((dev_t dev, int ifmt, int, struct proc *));
int (*d_close) __P((dev_t dev, int, int ifmt, struct proc *));