gettick
extern int gettick(void); /* XXX put in header file */
tick = gettick();
int gettick(void);
otick = gettick();
tick = gettick();
return (rtclock_tval - gettick());
extern int gettick(void); /* XXX put in header file */
tick = gettick();
int gettick(void);
otick = gettick();
tick = gettick();
return (rtclock_tval - gettick());
base = gettick();
now = gettick();