date and time created 93/06/02 19:11:53 by mckusick

[unix-history] / usr / src / lib / libc / gen / getloadavg.c

/*-
 * Copyright (c) 1989 The Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)getloadavg.c	6.7 (Berkeley) %G%";
#endif /* LIBC_SCCS and not lint */

#include <sys/param.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/sysctl.h>
#include <vm/vm_param.h>

#include <stdlib.h>

/*
 * getloadavg() -- Get system load averages.
 *
 * Put `nelem' samples into `loadavg' array.
 * Return number of samples retrieved, or -1 on error.
 */
int
getloadavg(loadavg, nelem)
	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 = MIN(nelem, sizeof(loadinfo.ldavg) / sizeof(fixpt_t));
	for (i = 0; i < nelem; i++)
		loadavg[i] = (double) loadinfo.ldavg[i] / loadinfo.fscale;
	return (nelem);
}