sysctl.c revision 1.15
1 /* $NetBSD: sysctl.c,v 1.15 2003/12/04 19:45:19 atatat Exp $ */ 2 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 #include <sys/cdefs.h> 33 #if defined(LIBC_SCCS) && !defined(lint) 34 #if 0 35 static char sccsid[] = "@(#)sysctl.c 8.2 (Berkeley) 1/4/94"; 36 #else 37 __RCSID("$NetBSD: sysctl.c,v 1.15 2003/12/04 19:45:19 atatat Exp $"); 38 #endif 39 #endif /* LIBC_SCCS and not lint */ 40 41 #include "namespace.h" 42 #include <sys/param.h> 43 #include <sys/sysctl.h> 44 45 #include <errno.h> 46 #include <paths.h> 47 #include <stdio.h> 48 #include <string.h> 49 #include <unistd.h> 50 #include "extern.h" 51 52 #ifdef __weak_alias 53 __weak_alias(sysctl,_sysctl) 54 #endif 55 56 /* 57 * handles requests off the user subtree 58 */ 59 static int user_sysctl(int *, u_int, void *, size_t *, const void *, size_t); 60 61 #include <stdlib.h> 62 63 int 64 sysctl(name, namelen, oldp, oldlenp, newp, newlen) 65 int *name; 66 unsigned int namelen; 67 void *oldp; 68 const void *newp; 69 size_t *oldlenp, newlen; 70 { 71 size_t oldlen, savelen; 72 int error; 73 74 if (name[0] != CTL_USER) 75 /* LINTED will fix when sysctl interface gets corrected */ 76 /* XXX when will that be? */ 77 return (__sysctl(name, namelen, oldp, oldlenp, 78 (void *)newp, newlen)); 79 80 oldlen = (oldlenp == NULL) ? 0 : *oldlenp; 81 savelen = oldlen; 82 error = user_sysctl(name + 1, namelen - 1, oldp, &oldlen, newp, newlen); 83 84 if (error != 0) { 85 errno = error; 86 return (-1); 87 } 88 89 if (oldlenp != NULL) { 90 *oldlenp = oldlen; 91 if (oldp != NULL && oldlen > savelen) { 92 errno = ENOMEM; 93 return (-1); 94 } 95 } 96 97 return (0); 98 } 99 100 static int 101 user_sysctl(name, namelen, oldp, oldlenp, newp, newlen) 102 int *name; 103 unsigned int namelen; 104 void *oldp; 105 const void *newp; 106 size_t *oldlenp, newlen; 107 { 108 #define _INT(s, n, v) { \ 109 .sysctl_flags = SYSCTL_IMMEDIATE|SYSCTL_PERMANENT|SYSCTL_READONLY| \ 110 SYSCTL_TYPE(CTLTYPE_INT), \ 111 .sysctl_size = sizeof(int), \ 112 .sysctl_name = (s), \ 113 .sysctl_num = (n), \ 114 .sysctl_un = { .scu_idata = (v), }, } 115 116 /* 117 * the nodes under the "user" node 118 */ 119 static const struct sysctlnode sysctl_usermib[] = { 120 #if defined(lint) 121 /* 122 * lint doesn't like my initializers 123 */ 124 0 125 #else /* !lint */ 126 { 127 .sysctl_flags = SYSCTL_READONLY|SYSCTL_PERMANENT| 128 SYSCTL_TYPE(CTLTYPE_STRING), 129 .sysctl_size = sizeof(_PATH_STDPATH), 130 .sysctl_name = "cs_path", 131 .sysctl_num = USER_CS_PATH, 132 .sysctl_un = { .scu_data = _PATH_STDPATH, }, 133 }, 134 _INT("bc_base_max", USER_BC_BASE_MAX, BC_BASE_MAX), 135 _INT("bc_dim_max", USER_BC_DIM_MAX, BC_DIM_MAX), 136 _INT("bc_scale_max", USER_BC_SCALE_MAX, BC_SCALE_MAX), 137 _INT("bc_string_max", USER_BC_STRING_MAX, BC_STRING_MAX), 138 _INT("coll_weights_max", USER_COLL_WEIGHTS_MAX, 139 COLL_WEIGHTS_MAX), 140 _INT("expr_nest_max", USER_EXPR_NEST_MAX, EXPR_NEST_MAX), 141 _INT("line_max", USER_LINE_MAX, LINE_MAX), 142 _INT("re_dup_max", USER_RE_DUP_MAX, RE_DUP_MAX), 143 _INT("posix2_version", USER_POSIX2_VERSION, _POSIX2_VERSION), 144 #ifdef POSIX2_C_BIND 145 _INT("posix2_c_bind", USER_POSIX2_C_BIND, 1), 146 #else 147 _INT("posix2_c_bind", USER_POSIX2_C_BIND, 0), 148 #endif 149 #ifdef POSIX2_C_DEV 150 _INT("posix2_c_dev", USER_POSIX2_C_DEV, 1), 151 #else 152 _INT("posix2_c_dev", USER_POSIX2_C_DEV, 0), 153 #endif 154 #ifdef POSIX2_CHAR_TERM 155 _INT("posix2_char_term", USER_POSIX2_CHAR_TERM, 1), 156 #else 157 _INT("posix2_char_term", USER_POSIX2_CHAR_TERM, 0), 158 #endif 159 #ifdef POSIX2_FORT_DEV 160 _INT("posix2_fort_dev", USER_POSIX2_FORT_DEV, 1), 161 #else 162 _INT("posix2_fort_dev", USER_POSIX2_FORT_DEV, 0), 163 #endif 164 #ifdef POSIX2_FORT_RUN 165 _INT("posix2_fort_run", USER_POSIX2_FORT_RUN, 1), 166 #else 167 _INT("posix2_fort_run", USER_POSIX2_FORT_RUN, 0), 168 #endif 169 #ifdef POSIX2_LOCALEDEF 170 _INT("posix2_localedef", USER_POSIX2_LOCALEDEF, 1), 171 #else 172 _INT("posix2_localedef", USER_POSIX2_LOCALEDEF, 0), 173 #endif 174 #ifdef POSIX2_SW_DEV 175 _INT("posix2_sw_dev", USER_POSIX2_SW_DEV, 1), 176 #else 177 _INT("posix2_sw_dev", USER_POSIX2_SW_DEV, 0), 178 #endif 179 #ifdef POSIX2_UPE 180 _INT("posix2_upe", USER_POSIX2_UPE, 1), 181 #else 182 _INT("posix2_upe", USER_POSIX2_UPE, 0), 183 #endif 184 _INT("stream_max", USER_STREAM_MAX, FOPEN_MAX), 185 _INT("tzname_max", USER_TZNAME_MAX, NAME_MAX), 186 _INT("atexit_max", USER_ATEXIT_MAX, -1), 187 #endif /* !lint */ 188 }; 189 #undef _INT 190 191 static const int clen = sizeof(sysctl_usermib) / 192 sizeof(sysctl_usermib[0]); 193 194 const struct sysctlnode *node; 195 int ni; 196 size_t l, sz; 197 198 /* 199 * none of these nodes are writable and they're all terminal (for now) 200 */ 201 if (newp != NULL || newlen != 0) 202 return (EPERM); 203 if (namelen != 1) 204 return (EINVAL); 205 206 l = *oldlenp; 207 if (name[0] == CTL_QUERY) { 208 sz = clen * sizeof(struct sysctlnode); 209 l = MIN(l, sz); 210 if (oldp != NULL) 211 memcpy(oldp, &sysctl_usermib[0], l); 212 *oldlenp = sz; 213 return (0); 214 } 215 216 node = &sysctl_usermib[0]; 217 for (ni = 0; ni < clen; ni++) 218 if (name[0] == node[ni].sysctl_num) 219 break; 220 if (ni == clen) 221 return (EOPNOTSUPP); 222 223 node = &node[ni]; 224 if (node->sysctl_flags & SYSCTL_IMMEDIATE) { 225 switch (SYSCTL_TYPE(node->sysctl_flags)) { 226 case CTLTYPE_INT: 227 newp = &node->sysctl_idata; 228 break; 229 case CTLTYPE_QUAD: 230 newp = &node->sysctl_qdata; 231 break; 232 default: 233 return (EINVAL); 234 } 235 } 236 else 237 newp = node->sysctl_data; 238 239 l = MIN(l, node->sysctl_size); 240 if (oldp != NULL) 241 memcpy(oldp, newp, l); 242 *oldlenp = node->sysctl_size; 243 244 return (0); 245 } 246
Indexes created Thu Sep 25 16:09:42 GMT 2025