sysctlnametomib.c revision 90039 
1/*
2 * Copyright 2001 The FreeBSD Project. 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 *
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE FREEBSD PROJECT ``AS IS'' AND ANY
15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
16 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
17 * DISCLAIMED.  IN NO EVENT SHALL THE FREEBSD PROJECT BE LIABLE FOR
18 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: head/lib/libc/gen/sysctlnametomib.c 90039 2002-02-01 00:57:29Z obrien $");
29
30#include <sys/types.h>
31#include <sys/sysctl.h>
32
33/*
34 * This function uses a presently undocumented interface to the kernel
35 * to walk the tree and get the type so it can print the value.
36 * This interface is under work and consideration, and should probably
37 * be killed with a big axe by the first person who can find the time.
38 * (be aware though, that the proper interface isn't as obvious as it
39 * may seem, there are various conflicting requirements.
40 */
41int
42sysctlnametomib(const char *name, int *mibp, size_t *sizep)
43{
44	int oid[2];
45	int error;
46
47	oid[0] = 0;
48	oid[1] = 3;
49
50	*sizep *= sizeof (int);
51	error = sysctl(oid, 2, mibp, sizep, (void *)name, strlen(name));
52	*sizep /= sizeof (int);
53	return (error);
54}
55