-int ttyopen(),ttylclose(),ttread(),ttwrite(),nullioctl(),ttstart();
-int ttymodem(), nullmodem(), ttyinput();
+int ttyopen __P((dev_t dev, struct tty *tp));
+int ttylclose __P((struct tty *tp, int flags));
+int ttread __P((struct tty *, struct uio *, int flags));
+int ttwrite __P((struct tty *, struct uio *, int flags));
+int nullioctl __P((struct tty *tp, int cmd, caddr_t data,
+ int flag, struct proc *p));
+int ttyinput __P((int c, struct tty *tp));
+int ttstart __P((struct tty *tp));
+int ttymodem __P((struct tty *tp, int flags));
+int nullmodem __P((struct tty *tp, int flags));