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 __FreeBSD__
29 #define _POSIX_SOURCE 1
30
31 /* System Headers */
32
33 #include <stdio.h>
34 #else
35 #include <stdlib.h>
36 #endif
37
38 /* Local headers */
39
40 #include "gloadavg.h"
41
42 /* Global functions */
43
44 void perr(const char *fmt, ...);
45
46 double
gloadavg(void)47 gloadavg(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