/*-
 * Copyright (c) 1989 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. 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 BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#if defined(LIBC_SCCS) && !defined(lint)
/*static char sccsid[] = "from: @(#)getloadavg.c	6.2 (Berkeley) 6/29/90";*/
static char rcsid[] = "$Id: getloadavg.c,v 1.3 1994/01/28 04:49:27 cgd Exp $";
#endif /* LIBC_SCCS and not lint */

#include <sys/types.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/kinfo.h>

/*
 *  getloadavg() -- Get system load averages.
 *
 *  Put `nelem' samples into `loadavg' array.
 *  Return number of samples retrieved, or -1 on error.
 */
getloadavg(loadavg, nelem)
	double loadavg[];
	int nelem;
{
	int needed, err, i;
	struct loadavg averunnable;

	needed = getkerninfo(KINFO_LOADAVG, NULL, NULL, 0);
	if (needed != sizeof(struct loadavg))
		return -1;

	err = getkerninfo(KINFO_LOADAVG, &averunnable, &needed, 0);
	if (err != 0 || needed != sizeof(struct loadavg))
		return -1;

	if (nelem > 3)
		nelem = 3;
	for (i = 0; i < nelem; i++)
		loadavg[i] = (double) averunnable.ldavg[i] / averunnable.fscale;
	return nelem;
}