/*
 * Copyright (c) 1983 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that: (1) source distributions retain this entire copyright
 * notice and comment, and (2) distributions including binaries display
 * the following acknowledgement:  ``This product includes software
 * developed by the University of California, Berkeley and its contributors''
 * in the documentation or other materials provided with the distribution
 * and in all advertising materials mentioning features or use of this
 * software. Neither the name of the University nor the names of its
 * contributors may be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */
#include <sys/time.h>
#include "hertz.h"


#ifdef __MSDOS__
# define HERTZ 18
#endif

int
hertz()
{
#ifdef HERTZ
    return HERTZ;
#else
    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;
    } /* if */
    return 1000000 / tim.it_interval.tv_usec;
#endif
} /* hertz */