1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 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 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #if defined(LIBC_SCCS) && !defined(lint) 33 static char sccsid[] = "@(#)sysctl.c 8.2 (Berkeley) 1/4/94"; 34 #endif /* LIBC_SCCS and not lint */ 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include <sys/param.h> 39 #include <sys/sysctl.h> 40 41 #include <errno.h> 42 #include <limits.h> 43 #include <paths.h> 44 #include <stdio.h> 45 #include <unistd.h> 46 #include <string.h> 47 48 extern int __sysctl(const int *name, u_int namelen, void *oldp, 49 size_t *oldlenp, const void *newp, size_t newlen); 50 51 int 52 sysctl(const int *name, u_int namelen, void *oldp, size_t *oldlenp, 53 const void *newp, size_t newlen) 54 { 55 int retval; 56 size_t orig_oldlen; 57 58 orig_oldlen = oldlenp ? *oldlenp : 0; 59 retval = __sysctl(name, namelen, oldp, oldlenp, newp, newlen); 60 /* 61 * All valid names under CTL_USER have a dummy entry in the sysctl 62 * tree (to support name lookups and enumerations) with an 63 * empty/zero value, and the true value is supplied by this routine. 64 * For all such names, __sysctl() is used solely to validate the 65 * name. 66 * 67 * Return here unless there was a successful lookup for a CTL_USER 68 * name. 69 */ 70 if (retval || name[0] != CTL_USER) 71 return (retval); 72 73 if (newp != NULL) { 74 errno = EPERM; 75 return (-1); 76 } 77 if (namelen != 2) { 78 errno = EINVAL; 79 return (-1); 80 } 81 82 switch (name[1]) { 83 case USER_CS_PATH: 84 if (oldp && orig_oldlen < sizeof(_PATH_STDPATH)) { 85 errno = ENOMEM; 86 return -1; 87 } 88 *oldlenp = sizeof(_PATH_STDPATH); 89 if (oldp != NULL) 90 memmove(oldp, _PATH_STDPATH, sizeof(_PATH_STDPATH)); 91 return (0); 92 } 93 94 if (oldp && *oldlenp < sizeof(int)) { 95 errno = ENOMEM; 96 return (-1); 97 } 98 *oldlenp = sizeof(int); 99 if (oldp == NULL) 100 return (0); 101 102 switch (name[1]) { 103 case USER_BC_BASE_MAX: 104 *(int *)oldp = BC_BASE_MAX; 105 return (0); 106 case USER_BC_DIM_MAX: 107 *(int *)oldp = BC_DIM_MAX; 108 return (0); 109 case USER_BC_SCALE_MAX: 110 *(int *)oldp = BC_SCALE_MAX; 111 return (0); 112 case USER_BC_STRING_MAX: 113 *(int *)oldp = BC_STRING_MAX; 114 return (0); 115 case USER_COLL_WEIGHTS_MAX: 116 *(int *)oldp = COLL_WEIGHTS_MAX; 117 return (0); 118 case USER_EXPR_NEST_MAX: 119 *(int *)oldp = EXPR_NEST_MAX; 120 return (0); 121 case USER_LINE_MAX: 122 *(int *)oldp = LINE_MAX; 123 return (0); 124 case USER_RE_DUP_MAX: 125 *(int *)oldp = RE_DUP_MAX; 126 return (0); 127 case USER_POSIX2_VERSION: 128 *(int *)oldp = _POSIX2_VERSION; 129 return (0); 130 case USER_POSIX2_C_BIND: 131 #ifdef POSIX2_C_BIND 132 *(int *)oldp = 1; 133 #else 134 *(int *)oldp = 0; 135 #endif 136 return (0); 137 case USER_POSIX2_C_DEV: 138 #ifdef POSIX2_C_DEV 139 *(int *)oldp = 1; 140 #else 141 *(int *)oldp = 0; 142 #endif 143 return (0); 144 case USER_POSIX2_CHAR_TERM: 145 #ifdef POSIX2_CHAR_TERM 146 *(int *)oldp = 1; 147 #else 148 *(int *)oldp = 0; 149 #endif 150 return (0); 151 case USER_POSIX2_FORT_DEV: 152 #ifdef POSIX2_FORT_DEV 153 *(int *)oldp = 1; 154 #else 155 *(int *)oldp = 0; 156 #endif 157 return (0); 158 case USER_POSIX2_FORT_RUN: 159 #ifdef POSIX2_FORT_RUN 160 *(int *)oldp = 1; 161 #else 162 *(int *)oldp = 0; 163 #endif 164 return (0); 165 case USER_POSIX2_LOCALEDEF: 166 #ifdef POSIX2_LOCALEDEF 167 *(int *)oldp = 1; 168 #else 169 *(int *)oldp = 0; 170 #endif 171 return (0); 172 case USER_POSIX2_SW_DEV: 173 #ifdef POSIX2_SW_DEV 174 *(int *)oldp = 1; 175 #else 176 *(int *)oldp = 0; 177 #endif 178 return (0); 179 case USER_POSIX2_UPE: 180 #ifdef POSIX2_UPE 181 *(int *)oldp = 1; 182 #else 183 *(int *)oldp = 0; 184 #endif 185 return (0); 186 case USER_STREAM_MAX: 187 *(int *)oldp = FOPEN_MAX; 188 return (0); 189 case USER_TZNAME_MAX: 190 *(int *)oldp = NAME_MAX; 191 return (0); 192 default: 193 errno = EINVAL; 194 return (-1); 195 } 196 /* NOTREACHED */ 197 } 198