1 /* $NetBSD: getloadavg.c,v 1.13 2003/08/07 16:42:50 agc Exp $ */ 2 3 /*- 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #if defined(LIBC_SCCS) && !defined(lint) 34 #if 0 35 static char sccsid[] = "@(#)getloadavg.c 8.1 (Berkeley) 6/4/93"; 36 #else 37 __RCSID("$NetBSD: getloadavg.c,v 1.13 2003/08/07 16:42:50 agc Exp $"); 38 #endif 39 #endif /* LIBC_SCCS and not lint */ 40 41 #include "namespace.h" 42 #include <sys/param.h> 43 #include <sys/time.h> 44 #include <sys/resource.h> 45 #include <sys/sysctl.h> 46 #include <uvm/uvm_param.h> 47 48 #include <assert.h> 49 #include <errno.h> 50 #include <stdlib.h> 51 52 #ifdef __weak_alias 53 __weak_alias(getloadavg,_getloadavg) 54 #endif 55 56 /* 57 * getloadavg() -- Get system load averages. 58 * 59 * Put `nelem' samples into `loadavg' array. 60 * Return number of samples retrieved, or -1 on error. 61 */ 62 int 63 getloadavg(loadavg, nelem) 64 double loadavg[]; 65 int nelem; 66 { 67 struct loadavg loadinfo; 68 int i, mib[2]; 69 size_t size; 70 71 _DIAGASSERT(loadavg != NULL); 72 _DIAGASSERT(nelem >= 0); 73 74 mib[0] = CTL_VM; 75 mib[1] = VM_LOADAVG; 76 size = sizeof(loadinfo); 77 if (sysctl(mib, 2, &loadinfo, &size, NULL, 0) < 0) 78 return (-1); 79 80 nelem = MIN((size_t) nelem, sizeof(loadinfo.ldavg) / sizeof(fixpt_t)); 81 for (i = 0; i < nelem; i++) 82 loadavg[i] = (double) loadinfo.ldavg[i] / loadinfo.fscale; 83 return (nelem); 84 } 85