text: /*	$NetBSD: kvm_getloadavg.c,v 1.4 1997/08/15 02:21:58 mikel Exp $	*/
  
  /*-
   * 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.
   */
  
  #include <sys/cdefs.h>
  #if defined(LIBC_SCCS) && !defined(lint)
  #if 0
  static char sccsid[] = "@(#)kvm_getloadavg.c	8.1 (Berkeley) 6/4/93";
  #else
  __RCSID("$NetBSD: kvm_getloadavg.c,v 1.4 1997/08/15 02:21:58 mikel Exp $");
  #endif
  #endif /* LIBC_SCCS and not lint */
  
  #include <sys/param.h>
  #include <sys/time.h>
  #include <sys/resource.h>
  #include <sys/proc.h>
  #include <sys/sysctl.h>
  #include <vm/vm_param.h>
  
  #include <db.h>
  #include <fcntl.h>
  #include <limits.h>
  #include <nlist.h>
  #include <kvm.h>
  #include <stdlib.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);
  }
  