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/*
* gloadavg.c - get load average for Linux
* Copyright (C) 1993 Thomas Koenig
*
* 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. The name of the author(s) may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``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 AUTHOR(S) 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, WETHER 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.
*/
#ifndef lint
static const char rcsid[] =
"$FreeBSD$";
#endif /* not lint */
#ifndef __FreeBSD__
#define _POSIX_SOURCE 1
/* System Headers */
#include <stdio.h>
#else
#include <stdlib.h>
#endif
/* Local headers */
#include "gloadavg.h"
/* Global functions */
void perr(const char *a);
double
gloadavg(void)
/* return the current load average as a floating point number, or <0 for
* error
*/
{
double result;
#ifndef __FreeBSD__
FILE *fp;
if((fp=fopen(PROC_DIR "loadavg","r")) == NULL)
result = -1.0;
else
{
if(fscanf(fp,"%lf",&result) != 1)
result = -1.0;
fclose(fp);
}
#else
if (getloadavg(&result, 1) != 1)
perr("error in getloadavg");
#endif
return result;
}
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