/* * Copyright (c) 1999 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * Portions Copyright (c) 1999 Apple Computer, Inc. All Rights * Reserved. This file contains Original Code and/or Modifications of * Original Code as defined in and that are subject to the Apple Public * Source License Version 1.1 (the "License"). You may not use this file * except in compliance with the License. Please obtain a copy of the * License at http://www.apple.com/publicsource and read it before using * this file. * * The Original Code and all software distributed under the License are * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT. Please see the * License for the specific language governing rights and limitations * under the License. * * @APPLE_LICENSE_HEADER_END@ */ /*- * Copyright (c) 1993 * 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[] = "@(#)kvm_getloadavg.c 8.1 (Berkeley) 6/4/93"; #endif /* LIBC_SCCS and not lint */ #include <sys/param.h> #include <sys/time.h> #include <sys/resource.h> #include <sys/ucred.h> #include <sys/proc.h> #include <sys/sysctl.h> #if defined(__APPLE__) #include <mach/machine/vm_param.h> #else #include <vm/vm_param.h> #endif /* !NeXT */ #include <db.h> #include <fcntl.h> #include <limits.h> #include <nlist.h> #include <kvm.h> #include "kvm_private.h" static struct nlist nl[] = { { "_averunnable" }, #define X_AVERUNNABLE 0 { "_fscale" }, #define X_FSCALE 1 { "" }, }; /* * kvm_getloadavg() -- Get system load averages, from live or dead kernels. * * Put `nelem' samples into `loadavg' array. * Return number of samples retrieved, or -1 on error. */ int kvm_getloadavg(kd, loadavg, nelem) kvm_t *kd; double loadavg[]; int nelem; { struct loadavg loadinfo; struct nlist *p; int fscale, i; if (ISALIVE(kd)) return (getloadavg(loadavg, nelem)); if (kvm_nlist(kd, nl) != 0) { for (p = nl; p->n_type != 0; ++p); _kvm_err(kd, kd->program, "%s: no such symbol", p->n_name); return (-1); } #define KREAD(kd, addr, obj) \ (kvm_read(kd, addr, (char *)(obj), sizeof(*obj)) != sizeof(*obj)) if (KREAD(kd, nl[X_AVERUNNABLE].n_value, &loadinfo)) { _kvm_err(kd, kd->program, "can't read averunnable"); return (-1); } /* * Old kernels have fscale separately; if not found assume * running new format. */ if (!KREAD(kd, nl[X_FSCALE].n_value, &fscale)) loadinfo.fscale = fscale; nelem = MIN(nelem, sizeof(loadinfo.ldavg) / sizeof(fixpt_t)); for (i = 0; i < nelem; i++) loadavg[i] = (double) loadinfo.ldavg[i] / loadinfo.fscale; return (nelem); }