1 /*- 2 * Copyright (c) 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)sysctl.c 8.2 (Berkeley) 1/4/94 30 * $FreeBSD: head/lib/libc/gen/sysctl.c 240176 2012-09-06 20:15:44Z trhodes $ 31 */ 32 33 #include <sys/param.h> 34 #include <sys/sysctl.h> 35 36 #include <errno.h> 37 #include <limits.h> 38 #include <paths.h> 39 #include <stdio.h> 40 #include <unistd.h> 41 #include <string.h> 42 43 extern int __sysctl(const int *name, u_int namelen, void *oldp, 44 size_t *oldlenp, const void *newp, size_t newlen); 45 46 int 47 sysctl(const int *name, u_int namelen, void *oldp, size_t *oldlenp, 48 const void *newp, size_t newlen) 49 { 50 int retval; 51 size_t orig_oldlen; 52 53 orig_oldlen = oldlenp ? *oldlenp : 0; 54 retval = __sysctl(name, namelen, oldp, oldlenp, newp, newlen); 55 /* 56 * All valid names under CTL_USER have a dummy entry in the sysctl 57 * tree (to support name lookups and enumerations) with an 58 * empty/zero value, and the true value is supplied by this routine. 59 * For all such names, __sysctl() is used solely to validate the 60 * name. 61 * 62 * Return here unless there was a successful lookup for a CTL_USER 63 * name. 64 */ 65 if (retval || name[0] != CTL_USER) 66 return (retval); 67 68 if (newp != NULL) { 69 errno = EPERM; 70 return (-1); 71 } 72 if (namelen != 2) { 73 errno = EINVAL; 74 return (-1); 75 } 76 77 switch (name[1]) { 78 case USER_CS_PATH: 79 if (oldp && orig_oldlen < sizeof(_PATH_STDPATH)) { 80 errno = ENOMEM; 81 return -1; 82 } 83 *oldlenp = sizeof(_PATH_STDPATH); 84 if (oldp != NULL) 85 memmove(oldp, _PATH_STDPATH, sizeof(_PATH_STDPATH)); 86 return (0); 87 } 88 89 if (oldp && *oldlenp < sizeof(int)) { 90 errno = ENOMEM; 91 return (-1); 92 } 93 *oldlenp = sizeof(int); 94 if (oldp == NULL) 95 return (0); 96 97 switch (name[1]) { 98 case USER_BC_BASE_MAX: 99 *(int *)oldp = BC_BASE_MAX; 100 return (0); 101 case USER_BC_DIM_MAX: 102 *(int *)oldp = BC_DIM_MAX; 103 return (0); 104 case USER_BC_SCALE_MAX: 105 *(int *)oldp = BC_SCALE_MAX; 106 return (0); 107 case USER_BC_STRING_MAX: 108 *(int *)oldp = BC_STRING_MAX; 109 return (0); 110 case USER_COLL_WEIGHTS_MAX: 111 *(int *)oldp = COLL_WEIGHTS_MAX; 112 return (0); 113 case USER_EXPR_NEST_MAX: 114 *(int *)oldp = EXPR_NEST_MAX; 115 return (0); 116 case USER_LINE_MAX: 117 *(int *)oldp = LINE_MAX; 118 return (0); 119 case USER_RE_DUP_MAX: 120 *(int *)oldp = RE_DUP_MAX; 121 return (0); 122 case USER_POSIX2_VERSION: 123 *(int *)oldp = _POSIX2_VERSION; 124 return (0); 125 case USER_POSIX2_C_BIND: 126 #if _POSIX2_C_BIND > 0 127 *(int *)oldp = 1; 128 #else 129 *(int *)oldp = 0; 130 #endif 131 return (0); 132 case USER_POSIX2_C_DEV: 133 #if _POSIX2_C_DEV > 0 134 *(int *)oldp = 1; 135 #else 136 *(int *)oldp = 0; 137 #endif 138 return (0); 139 case USER_POSIX2_CHAR_TERM: 140 #if _POSIX2_CHAR_TERM > 0 141 *(int *)oldp = 1; 142 #else 143 *(int *)oldp = 0; 144 #endif 145 return (0); 146 case USER_POSIX2_FORT_DEV: 147 #if _POSIX2_FORT_DEV > 0 148 *(int *)oldp = 1; 149 #else 150 *(int *)oldp = 0; 151 #endif 152 return (0); 153 case USER_POSIX2_FORT_RUN: 154 #if _POSIX2_FORT_RUN > 0 155 *(int *)oldp = 1; 156 #else 157 *(int *)oldp = 0; 158 #endif 159 return (0); 160 case USER_POSIX2_LOCALEDEF: 161 #if _POSIX2_LOCALEDEF > 0 162 *(int *)oldp = 1; 163 #else 164 *(int *)oldp = 0; 165 #endif 166 return (0); 167 case USER_POSIX2_SW_DEV: 168 #if _POSIX2_SW_DEV > 0 169 *(int *)oldp = 1; 170 #else 171 *(int *)oldp = 0; 172 #endif 173 return (0); 174 case USER_POSIX2_UPE: 175 #if _POSIX2_UPE > 0 176 *(int *)oldp = 1; 177 #else 178 *(int *)oldp = 0; 179 #endif 180 return (0); 181 case USER_STREAM_MAX: 182 *(int *)oldp = FOPEN_MAX; 183 return (0); 184 case USER_TZNAME_MAX: 185 *(int *)oldp = NAME_MAX; 186 return (0); 187 default: 188 errno = EINVAL; 189 return (-1); 190 } 191 /* NOTREACHED */ 192 } 193