lib/libc/gen/sysctl.c

   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 }