gloadavg.c revision 21673 
1/*
2 *  gloadavg.c - get load average for Linux
3 *  Copyright (C) 1993  Thomas Koenig
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. The name of the author(s) may not be used to endorse or promote
11 *    products derived from this software without specific prior written
12 *    permission.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#ifndef __FreeBSD__
27#define _POSIX_SOURCE 1
28
29/* System Headers */
30
31#include <stdio.h>
32#else
33#include <stdlib.h>
34#endif
35
36/* Local headers */
37
38#include "gloadavg.h"
39
40/* File scope variables */
41
42static char rcsid[] = "$FreeBSD: head/libexec/atrun/gloadavg.c 21673 1997-01-14 07:20:47Z jkh $";
43
44/* Global functions */
45
46double
47gloadavg(void)
48/* return the current load average as a floating point number, or <0 for
49 * error
50 */
51{
52    double result;
53#ifndef __FreeBSD__
54    FILE *fp;
55
56    if((fp=fopen(PROC_DIR "loadavg","r")) == NULL)
57	result = -1.0;
58    else
59    {
60	if(fscanf(fp,"%lf",&result) != 1)
61	    result = -1.0;
62	fclose(fp);
63    }
64#else
65    if (getloadavg(&result, 1) != 1)
66	    perr("Error in getloadavg");
67#endif
68    return result;
69}
70