xref: /titanic_44/usr/src/uts/common/syscall/getloadavg.c (revision 87308b749adb04ab3f564c765b089962af3edb4d)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License, Version 1.0 only
6  * (the "License").  You may not use this file except in compliance
7  * with the License.
8  *
9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10  * or http://www.opensolaris.org/os/licensing.
11  * See the License for the specific language governing permissions
12  * and limitations under the License.
13  *
14  * When distributing Covered Code, include this CDDL HEADER in each
15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16  * If applicable, add the following below this CDDL HEADER, with the
17  * fields enclosed by brackets "[]" replaced with your own identifying
18  * information: Portions Copyright [yyyy] [name of copyright owner]
19  *
20  * CDDL HEADER END
21  */
22 /*
23  * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
25  * Copyright 2011 Joyent, Inc.  All rights reserved.
26  */
27 
28 #include <sys/types.h>
29 #include <sys/systm.h>
30 #include <sys/errno.h>
31 #include <sys/loadavg.h>
32 #include <sys/zone.h>
33 #include <sys/pool_pset.h>
34 
35 /*
36  * Extract elements of the raw avenrun array from the kernel for the
37  * implementation of getloadavg(3c)
38  */
39 int
40 getloadavg(int *buf, int nelem)
41 {
42 	int *loadbuf = &avenrun[0];
43 	int error;
44 
45 	if (nelem < 0)
46 		return (set_errno(EINVAL));
47 	if (nelem > LOADAVG_NSTATS)
48 		nelem = LOADAVG_NSTATS;
49 
50 	if (!INGLOBALZONE(curproc)) {
51 		loadbuf = &curproc->p_zone->zone_avenrun[0];
52 	}
53 
54 	error = copyout(loadbuf, buf, nelem * sizeof (avenrun[0]));
55 	if (error)
56 		return (set_errno(EFAULT));
57 	return (nelem);
58 }
59