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/* $OpenBSD: kvm_getloadavg.c,v 1.9 2009/10/27 23:59:28 deraadt Exp $ */ |
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/* $NetBSD: kvm_getloadavg.c,v 1.2 1996/03/18 22:33:31 thorpej Exp $ */ |
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/*- |
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* Copyright (c) 1993 |
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* The Regents of the University of California. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. Neither the name of the University nor the names of its contributors |
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* may be used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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*/ |
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#include <sys/param.h> |
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#include <sys/time.h> |
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#include <sys/resource.h> |
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#include <sys/proc.h> |
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#include <sys/sysctl.h> |
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#include <db.h> |
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#include <fcntl.h> |
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#include <limits.h> |
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#include <nlist.h> |
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#include <stdlib.h> |
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#include <kvm.h> |
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#include "kvm_private.h" |
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static struct nlist nl[] = { |
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{ "_averunnable" }, |
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#define X_AVERUNNABLE 0 |
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{ "_fscale" }, |
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#define X_FSCALE 1 |
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{ "" }, |
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}; |
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/* |
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* kvm_getloadavg() -- Get system load averages, from live or dead kernels. |
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* |
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* Put `nelem' samples into `loadavg' array. |
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* Return number of samples retrieved, or -1 on error. |
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*/ |
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int |
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kvm_getloadavg(kvm_t *kd, double loadavg[], int nelem) |
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{ |
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struct loadavg loadinfo; |
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struct nlist *p; |
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int fscale, i; |
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if (ISALIVE(kd)) |
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return (getloadavg(loadavg, nelem)); |
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if (kvm_nlist(kd, nl) != 0) { |
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for (p = nl; p->n_type != 0; ++p) |
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; |
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_kvm_err(kd, kd->program, |
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"%s: no such symbol", p->n_name); |
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return (-1); |
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} |
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if (KREAD(kd, nl[X_AVERUNNABLE].n_value, &loadinfo)) { |
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_kvm_err(kd, kd->program, "can't read averunnable"); |
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return (-1); |
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} |
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/* |
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* Old kernels have fscale separately; if not found assume |
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* running new format. |
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*/ |
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if (!KREAD(kd, nl[X_FSCALE].n_value, &fscale)) |
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loadinfo.fscale = fscale; |
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nelem = MIN(nelem, sizeof(loadinfo.ldavg) / sizeof(fixpt_t)); |
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for (i = 0; i < nelem; i++) |
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loadavg[i] = (double) loadinfo.ldavg[i] / loadinfo.fscale; |
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return (nelem); |
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} |