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
29 static const char rcsid[] =
30 "$FreeBSD: stable/12/libexec/atrun/gloadavg.c 326274 2017-11-27 15:25:02Z pfg $";
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
49 void perr(const char *fmt, ...);
50
51 double
gloadavg(void)52 gloadavg(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