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 * 4. 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 30 #if defined(LIBC_SCCS) && !defined(lint) 31 static char sccsid[] = "@(#)sysctl.c 8.2 (Berkeley) 1/4/94"; 32 #endif /* LIBC_SCCS and not lint */ 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 36 #include <sys/param.h> 37 #include <sys/sysctl.h> 38 39 #include <errno.h> 40 #include <limits.h> 41 #include <paths.h> 42 #include <stdio.h> 43 #include <unistd.h> 44 #include <string.h> 45 46 extern int __sysctl(const int *name, u_int namelen, void *oldp, 47 size_t *oldlenp, const void *newp, size_t newlen); 48 49 int 50 sysctl(const int *name, u_int namelen, void *oldp, size_t *oldlenp, 51 const void *newp, size_t newlen) 52 { 53 int retval; 54 size_t orig_oldlen; 55 56 orig_oldlen = oldlenp ? *oldlenp : 0; 57 retval = __sysctl(name, namelen, oldp, oldlenp, newp, newlen); 58 /* 59 * All valid names under CTL_USER have a dummy entry in the sysctl 60 * tree (to support name lookups and enumerations) with an 61 * empty/zero value, and the true value is supplied by this routine. 62 * For all such names, __sysctl() is used solely to validate the 63 * name. 64 * 65 * Return here unless there was a successful lookup for a CTL_USER 66 * name. 67 */ 68 if (retval || name[0] != CTL_USER) 69 return (retval); 70 71 if (newp != NULL) { 72 errno = EPERM; 73 return (-1); 74 } 75 if (namelen != 2) { 76 errno = EINVAL; 77 return (-1); 78 } 79 80 switch (name[1]) { 81 case USER_CS_PATH: 82 if (oldp && orig_oldlen < sizeof(_PATH_STDPATH)) { 83 errno = ENOMEM; 84 return -1; 85 } 86 *oldlenp = sizeof(_PATH_STDPATH); 87 if (oldp != NULL) 88 memmove(oldp, _PATH_STDPATH, sizeof(_PATH_STDPATH)); 89 return (0); 90 } 91 92 if (oldp && *oldlenp < sizeof(int)) { 93 errno = ENOMEM; 94 return (-1); 95 } 96 *oldlenp = sizeof(int); 97 if (oldp == NULL) 98 return (0); 99 100 switch (name[1]) { 101 case USER_BC_BASE_MAX: 102 *(int *)oldp = BC_BASE_MAX; 103 return (0); 104 case USER_BC_DIM_MAX: 105 *(int *)oldp = BC_DIM_MAX; 106 return (0); 107 case USER_BC_SCALE_MAX: 108 *(int *)oldp = BC_SCALE_MAX; 109 return (0); 110 case USER_BC_STRING_MAX: 111 *(int *)oldp = BC_STRING_MAX; 112 return (0); 113 case USER_COLL_WEIGHTS_MAX: 114 *(int *)oldp = COLL_WEIGHTS_MAX; 115 return (0); 116 case USER_EXPR_NEST_MAX: 117 *(int *)oldp = EXPR_NEST_MAX; 118 return (0); 119 case USER_LINE_MAX: 120 *(int *)oldp = LINE_MAX; 121 return (0); 122 case USER_RE_DUP_MAX: 123 *(int *)oldp = RE_DUP_MAX; 124 return (0); 125 case USER_POSIX2_VERSION: 126 *(int *)oldp = _POSIX2_VERSION; 127 return (0); 128 case USER_POSIX2_C_BIND: 129 #ifdef POSIX2_C_BIND 130 *(int *)oldp = 1; 131 #else 132 *(int *)oldp = 0; 133 #endif 134 return (0); 135 case USER_POSIX2_C_DEV: 136 #ifdef POSIX2_C_DEV 137 *(int *)oldp = 1; 138 #else 139 *(int *)oldp = 0; 140 #endif 141 return (0); 142 case USER_POSIX2_CHAR_TERM: 143 #ifdef POSIX2_CHAR_TERM 144 *(int *)oldp = 1; 145 #else 146 *(int *)oldp = 0; 147 #endif 148 return (0); 149 case USER_POSIX2_FORT_DEV: 150 #ifdef POSIX2_FORT_DEV 151 *(int *)oldp = 1; 152 #else 153 *(int *)oldp = 0; 154 #endif 155 return (0); 156 case USER_POSIX2_FORT_RUN: 157 #ifdef POSIX2_FORT_RUN 158 *(int *)oldp = 1; 159 #else 160 *(int *)oldp = 0; 161 #endif 162 return (0); 163 case USER_POSIX2_LOCALEDEF: 164 #ifdef POSIX2_LOCALEDEF 165 *(int *)oldp = 1; 166 #else 167 *(int *)oldp = 0; 168 #endif 169 return (0); 170 case USER_POSIX2_SW_DEV: 171 #ifdef POSIX2_SW_DEV 172 *(int *)oldp = 1; 173 #else 174 *(int *)oldp = 0; 175 #endif 176 return (0); 177 case USER_POSIX2_UPE: 178 #ifdef POSIX2_UPE 179 *(int *)oldp = 1; 180 #else 181 *(int *)oldp = 0; 182 #endif 183 return (0); 184 case USER_STREAM_MAX: 185 *(int *)oldp = FOPEN_MAX; 186 return (0); 187 case USER_TZNAME_MAX: 188 *(int *)oldp = NAME_MAX; 189 return (0); 190 default: 191 errno = EINVAL; 192 return (-1); 193 } 194 /* NOTREACHED */ 195 } 196