Merge from vendor branch BZIP:
[dragonfly.git] / lib / libc / gen / getloadavg.3
CommitLineData
984263bc
MD
1.\" Copyright (c) 1989, 1991, 1993
2.\" The Regents of the University of California. All rights reserved.
3.\"
4.\" Redistribution and use in source and binary forms, with or without
5.\" modification, are permitted provided that the following conditions
6.\" are met:
7.\" 1. Redistributions of source code must retain the above copyright
8.\" notice, this list of conditions and the following disclaimer.
9.\" 2. Redistributions in binary form must reproduce the above copyright
10.\" notice, this list of conditions and the following disclaimer in the
11.\" documentation and/or other materials provided with the distribution.
12.\" 3. All advertising materials mentioning features or use of this software
13.\" must display the following acknowledgement:
14.\" This product includes software developed by the University of
15.\" California, Berkeley and its contributors.
16.\" 4. Neither the name of the University nor the names of its contributors
17.\" may be used to endorse or promote products derived from this software
18.\" without specific prior written permission.
19.\"
20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30.\" SUCH DAMAGE.
31.\"
32.\" @(#)getloadavg.3 8.1 (Berkeley) 6/4/93
33.\" $FreeBSD: src/lib/libc/gen/getloadavg.3,v 1.6.2.2 2001/12/14 18:33:51 ru Exp $
1de703da 34.\" $DragonFly: src/lib/libc/gen/getloadavg.3,v 1.2 2003/06/17 04:26:42 dillon Exp $
984263bc
MD
35.\"
36.Dd June 4, 1993
37.Dt GETLOADAVG 3
38.Os
39.Sh NAME
40.Nm getloadavg
41.Nd get system load averages
42.Sh LIBRARY
43.Lb libc
44.Sh SYNOPSIS
45.In stdlib.h
46.Ft int
47.Fn getloadavg "double loadavg[]" "int nelem"
48.Sh DESCRIPTION
49The
50.Fn getloadavg
51function returns the number of processes in the system run queue
52averaged over various periods of time.
53Up to
54.Fa nelem
55samples are retrieved and assigned to successive elements of
56.Fa loadavg Ns Bq .
57The system imposes a maximum of 3 samples, representing averages
58over the last 1, 5, and 15 minutes, respectively.
59.Sh DIAGNOSTICS
60If the load average was unobtainable, \-1 is returned; otherwise,
61the number of samples actually retrieved is returned.
62.Sh SEE ALSO
63.Xr uptime 1 ,
64.Xr kvm_getloadavg 3 ,
65.Xr sysctl 3
66.Sh HISTORY
67The
68.Fn getloadavg
69function appeared in
70.Bx 4.3 Reno .