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