1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
3  *
4 * Copyright 2019 Pawel Biernacki, Mysterious Code Ltd.
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 AUTHOR AND CONTRIBUTORS ``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 AUTHOR OR CONTRIBUTORS 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/cdefs.h>
30__FBSDID("$FreeBSD$");
31
32#include <sys/param.h>
33#include <sys/sysctl.h>
34#include <string.h>
35
36#include "libc_private.h"
37
38#define	SYSCTLBYNAME_OSREL	1201522
39
40extern int __sysctlbyname(const char *name, size_t namelen, void *oldp,
41    size_t *oldlenp, const void *newp, size_t newlen);
42
43int
44sysctlbyname(const char *name, void *oldp, size_t *oldlenp,
45    const void *newp, size_t newlen)
46{
47	int oid[CTL_MAXNAME];
48	size_t len;
49
50	if (__getosreldate() >= SYSCTLBYNAME_OSREL) {
51		len = strlen(name);
52		return (__sysctlbyname(name, len, oldp, oldlenp, newp,
53		    newlen));
54	}
55	len = nitems(oid);
56	if (sysctlnametomib(name, oid, &len) == -1)
57		return (-1);
58	return (sysctl(oid, len, oldp, oldlenp, newp, newlen));
59}
60