11573Srgrimes/*-
21573Srgrimes * Copyright (c) 1989, 1993
31573Srgrimes *	The Regents of the University of California.  All rights reserved.
41573Srgrimes *
51573Srgrimes * Redistribution and use in source and binary forms, with or without
61573Srgrimes * modification, are permitted provided that the following conditions
71573Srgrimes * are met:
81573Srgrimes * 1. Redistributions of source code must retain the above copyright
91573Srgrimes *    notice, this list of conditions and the following disclaimer.
101573Srgrimes * 2. Redistributions in binary form must reproduce the above copyright
111573Srgrimes *    notice, this list of conditions and the following disclaimer in the
121573Srgrimes *    documentation and/or other materials provided with the distribution.
131573Srgrimes * 4. Neither the name of the University nor the names of its contributors
141573Srgrimes *    may be used to endorse or promote products derived from this software
151573Srgrimes *    without specific prior written permission.
161573Srgrimes *
171573Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
181573Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
191573Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
201573Srgrimes * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
211573Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
221573Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
231573Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
241573Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
251573Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
261573Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
271573Srgrimes * SUCH DAMAGE.
281573Srgrimes */
291573Srgrimes
301573Srgrimes#if defined(LIBC_SCCS) && !defined(lint)
311573Srgrimesstatic char sccsid[] = "@(#)getloadavg.c	8.1 (Berkeley) 6/4/93";
321573Srgrimes#endif /* LIBC_SCCS and not lint */
3392986Sobrien#include <sys/cdefs.h>
3492986Sobrien__FBSDID("$FreeBSD$");
351573Srgrimes
361573Srgrimes#include <sys/param.h>
371573Srgrimes#include <sys/time.h>
381573Srgrimes#include <sys/resource.h>
391573Srgrimes#include <sys/sysctl.h>
401573Srgrimes#include <vm/vm_param.h>
411573Srgrimes
421573Srgrimes#include <stdlib.h>
431573Srgrimes
441573Srgrimes/*
451573Srgrimes * getloadavg() -- Get system load averages.
461573Srgrimes *
471573Srgrimes * Put `nelem' samples into `loadavg' array.
481573Srgrimes * Return number of samples retrieved, or -1 on error.
491573Srgrimes */
501573Srgrimesint
51287793Srodrigcgetloadavg(double loadavg[], int nelem)
521573Srgrimes{
531573Srgrimes	struct loadavg loadinfo;
541573Srgrimes	int i, mib[2];
551573Srgrimes	size_t size;
561573Srgrimes
571573Srgrimes	mib[0] = CTL_VM;
581573Srgrimes	mib[1] = VM_LOADAVG;
591573Srgrimes	size = sizeof(loadinfo);
601573Srgrimes	if (sysctl(mib, 2, &loadinfo, &size, NULL, 0) < 0)
611573Srgrimes		return (-1);
621573Srgrimes
631573Srgrimes	nelem = MIN(nelem, sizeof(loadinfo.ldavg) / sizeof(fixpt_t));
641573Srgrimes	for (i = 0; i < nelem; i++)
651573Srgrimes		loadavg[i] = (double) loadinfo.ldavg[i] / loadinfo.fscale;
661573Srgrimes	return (nelem);
671573Srgrimes}
68