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: releng/11.0/lib/libc/gen/getloadavg.c 287793 2015-09-14 18:44:13Z rodrigc $"); 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