xref: /dragonfly/libexec/atrun/gloadavg.c (revision 19fe1c42)
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  * $FreeBSD: src/libexec/atrun/gloadavg.c,v 1.6 2007/06/15 10:12:37 yar Exp $
26  * $DragonFly: src/libexec/atrun/gloadavg.c,v 1.3 2004/02/03 23:24:50 rob Exp $
27  */
28 
29 /* System Headers */
30 
31 #include <stdlib.h>
32 
33 /* Local headers */
34 
35 #include "gloadavg.h"
36 
37 /* Global functions */
38 
39 void perr(const char *fmt, ...);
40 
41 double
42 gloadavg(void)
43 /* return the current load average as a floating point number, or <0 for
44  * error
45  */
46 {
47     double result;
48     if (getloadavg(&result, 1) != 1)
49 	    perr("error in getloadavg");
50     return result;
51 }
52