#ifndef lint
    static	char *sccsid = "@(#)hertz.c	1.4 (Berkeley) 03/24/85";
#endif lint

#include <sys/time.h>

    /*
     *	discover the tick frequency of the machine
     *	if something goes wrong, we return 0, an impossible hertz.
     */
#define	HZ_WRONG	0

hertz()
{
	struct itimerval tim;

	tim.it_interval.tv_sec = 0;
	tim.it_interval.tv_usec = 1;
	tim.it_value.tv_sec = 0;
	tim.it_value.tv_usec = 0;
	setitimer(ITIMER_REAL, &tim, 0);
	setitimer(ITIMER_REAL, 0, &tim);
	if (tim.it_interval.tv_usec < 2)
		return(HZ_WRONG);
	return (1000000 / tim.it_interval.tv_usec);
}