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/param.h>
30 #include <sys/sysctl.h>
31 #include <string.h>
32
33 extern int __sysctlbyname(const char *name, size_t namelen, void *oldp,
34 size_t *oldlenp, const void *newp, size_t newlen);
35
36 int
sysctlbyname(const char * name,void * oldp,size_t * oldlenp,const void * newp,size_t newlen)37 sysctlbyname(const char *name, void *oldp, size_t *oldlenp,
38 const void *newp, size_t newlen)
39 {
40 size_t len;
41 int oid[2];
42
43 if (__predict_true(strncmp(name, "user.", 5) != 0)) {
44 len = strlen(name);
45 return (__sysctlbyname(name, len, oldp, oldlenp, newp,
46 newlen));
47 } else {
48 len = nitems(oid);
49 if (sysctlnametomib(name, oid, &len) == -1)
50 return (-1);
51 return (sysctl(oid, (u_int)len, oldp, oldlenp, newp,
52 newlen));
53 }
54 }
55