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/* $OpenBSD: getloadavg.c,v 1.7 2015/01/16 16:48:51 deraadt Exp $ */
/*-
* Copyright (c) 1989, 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. 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/time.h>
#include <sys/resource.h>
#include <sys/sysctl.h>
#include <stdlib.h>
#define MINIMUM(a, b) (((a) < (b)) ? (a) : (b))
/*
* getloadavg() -- Get system load averages.
*
* Put `nelem' samples into `loadavg' array.
* Return number of samples retrieved, or -1 on error.
*/
int
getloadavg(double loadavg[], int nelem)
{
struct loadavg loadinfo;
int i, mib[2];
size_t size;
mib[0] = CTL_VM;
mib[1] = VM_LOADAVG;
size = sizeof(loadinfo);
if (sysctl(mib, 2, &loadinfo, &size, NULL, 0) < 0)
return (-1);
nelem = MINIMUM(nelem, sizeof(loadinfo.ldavg) / sizeof(fixpt_t));
for (i = 0; i < nelem; i++)
loadavg[i] = (double) loadinfo.ldavg[i] / loadinfo.fscale;
return (nelem);
}
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