1/*-
2 *  gloadavg.c - get load average for Linux
3 *  Copyright (C) 1993  Thomas Koenig
4 *
5 * SPDX-License-Identifier: BSD-2-Clause
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. The name of the author(s) may not be used to endorse or promote
13 *    products derived from this software without specific prior written
14 *    permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28#ifndef lint
29static const char rcsid[] =
30  "$FreeBSD$";
31#endif /* not lint */
32
33#ifndef __FreeBSD__
34#define _POSIX_SOURCE 1
35
36/* System Headers */
37
38#include <stdio.h>
39#else
40#include <stdlib.h>
41#endif
42
43/* Local headers */
44
45#include "gloadavg.h"
46
47/* Global functions */
48
49void perr(const char *fmt, ...);
50
51double
52gloadavg(void)
53/* return the current load average as a floating point number, or <0 for
54 * error
55 */
56{
57    double result;
58#ifndef __FreeBSD__
59    FILE *fp;
60
61    if((fp=fopen(PROC_DIR "loadavg","r")) == NULL)
62	result = -1.0;
63    else
64    {
65	if(fscanf(fp,"%lf",&result) != 1)
66	    result = -1.0;
67	fclose(fp);
68    }
69#else
70    if (getloadavg(&result, 1) != 1)
71	    perr("error in getloadavg");
72#endif
73    return result;
74}
75