sysctlbyname.c revision 1.3 
1/*	$NetBSD: sysctlbyname.c,v 1.3 2005/06/12 05:21:27 lukem Exp $ */
2
3/*-
4 * Copyright (c) 2003,2004 The NetBSD Foundation, Inc.
5 *	All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Andrew Brown.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of The NetBSD Foundation nor the names of its
19 *    contributors may be used to endorse or promote products derived
20 *    from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
24 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
25 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
26 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
32 * POSSIBILITY OF SUCH DAMAGE.
33 */
34
35#include <sys/cdefs.h>
36#if defined(LIBC_SCCS) && !defined(lint)
37__RCSID("$NetBSD: sysctlbyname.c,v 1.3 2005/06/12 05:21:27 lukem Exp $");
38#endif /* LIBC_SCCS and not lint */
39
40#include "namespace.h"
41#include <sys/param.h>
42#include <sys/sysctl.h>
43
44#ifdef __weak_alias
45__weak_alias(sysctlbyname,_sysctlbyname)
46#endif
47
48/*
49 * trivial sysctlbyname() function for the "lazy".
50 */
51int
52sysctlbyname(const char *gname, void *oldp, size_t *oldlenp, void *newp,
53	     size_t newlen)
54{
55	int name[CTL_MAXNAME], rc;
56	u_int namelen;
57
58	rc = sysctlgetmibinfo(gname, &name[0], &namelen, NULL, NULL, NULL,
59			      SYSCTL_VERSION);
60	if (rc == 0)
61		rc = sysctl(&name[0], namelen, oldp, oldlenp, newp, newlen);
62	return (rc);
63}
64