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 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