1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright 2001 The FreeBSD Project. All Rights Reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE FREEBSD PROJECT ``AS IS'' AND ANY
17 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19 * DISCLAIMED. IN NO EVENT SHALL THE FREEBSD PROJECT BE LIABLE FOR
20 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/types.h>
30 #include <sys/sysctl.h>
31 #include <string.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 */
41 int
sysctlnametomib(const char * name,int * mibp,size_t * sizep)42 sysctlnametomib(const char *name, int *mibp, size_t *sizep)
43 {
44 int oid[2];
45 int error;
46
47 oid[0] = CTL_SYSCTL;
48 oid[1] = CTL_SYSCTL_NAME2OID;
49
50 *sizep *= sizeof(int);
51 error = sysctl(oid, 2, mibp, sizep, name, strlen(name));
52 *sizep /= sizeof(int);
53 return (error);
54 }
55