1 /*- 2 * Copyright (c) 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)getloadavg.c 8.1 (Berkeley) 6/4/93 30 * $DragonFly: src/lib/libc/gen/getloadavg.c,v 1.4 2005/04/30 23:28:57 hmp Exp $ 31 */ 32 33 #include <sys/param.h> 34 #include <sys/time.h> 35 #include <sys/resource.h> 36 #include <sys/sysctl.h> 37 38 #include <stdlib.h> 39 40 /* 41 * getloadavg() -- Get system load averages. 42 * 43 * Put `nelem' samples into `loadavg' array. 44 * Return number of samples retrieved, or -1 on error. 45 */ 46 int 47 getloadavg(double loadavg[], int nelem) 48 { 49 struct loadavg loadinfo; 50 size_t i, size; 51 52 size = sizeof(loadinfo); 53 if (sysctlbyname("vm.loadavg", &loadinfo, &size, NULL, 0) < 0) 54 return (-1); 55 56 nelem = MIN(nelem, sizeof(loadinfo.ldavg) / sizeof(__uint64_t)); 57 for (i = 0; i < nelem; i++) 58 loadavg[i] = (double) loadinfo.ldavg[i] / loadinfo.fscale; 59 return (nelem); 60 } 61