sysdeps/posix/sysconf.c

   1 /* Copyright (C) 1991, 1993, 1995, 1996 Free Software Foundation, Inc.
   2 This file is part of the GNU C Library.
   3
   4 The GNU C Library is free software; you can redistribute it and/or
   5 modify it under the terms of the GNU Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 License, or (at your option) any later version.
   8
   9 The GNU C Library is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <ansidecl.h>
  20 #include <errno.h>
  21 #include <limits.h>
  22 #include <unistd.h>
  23 #include <stddef.h>
  24 #include <stdio.h>
  25 #include <time.h>
  26
  27 extern int EXFUN(__getdtablesize, (NOARGS));
  28 extern size_t EXFUN(__getpagesize, (NOARGS));
  29
  30 /* Get the value of the system variable NAME.  */
  31 long int
  32 DEFUN(__sysconf, (name), int name)
  33 {
  34   switch (name)
  35     {
  36     default:
  37       errno = EINVAL;
  38       return -1;
  39
  40     case _SC_ARG_MAX:
  41 #ifdef  ARG_MAX
  42       return ARG_MAX;
  43 #else
  44       return -1;
  45 #endif
  46
  47     case _SC_CHILD_MAX:
  48 #ifdef  CHILD_MAX
  49       return CHILD_MAX;
  50 #else
  51       return -1;
  52 #endif
  53
  54     case _SC_CLK_TCK:
  55 #ifdef  CLK_TCK
  56       return CLK_TCK;
  57 #else
  58       return 60;
  59 #endif
  60
  61     case _SC_NGROUPS_MAX:
  62 #ifdef  NGROUPS_MAX
  63       return NGROUPS_MAX;
  64 #else
  65       return -1;
  66 #endif
  67
  68     case _SC_OPEN_MAX:
  69       return __getdtablesize ();
  70
  71     case _SC_STREAM_MAX:
  72 #ifdef  STREAM_MAX
  73       return STREAM_MAX;
  74 #else
  75       return FOPEN_MAX;
  76 #endif
  77
  78     case _SC_TZNAME_MAX:
  79       return __tzname_max ();
  80
  81     case _SC_JOB_CONTROL:
  82 #ifdef  _POSIX_JOB_CONTROL
  83       return 1;
  84 #else
  85       return -1;
  86 #endif
  87
  88     case _SC_SAVED_IDS:
  89 #ifdef  _POSIX_SAVED_IDS
  90       return 1;
  91 #else
  92       return -1;
  93 #endif
  94
  95     case _SC_REALTIME_SIGNALS:
  96 #ifdef  _POSIX_REALTIME_SIGNALS
  97       return 1;
  98 #else
  99       return -1;
 100 #endif
 101
 102     case _SC_PRIORITY_SCHEDULING:
 103 #ifdef  _POSIX_PRIORITY_SCHEDULING
 104       return 1;
 105 #else
 106       return -1;
 107 #endif
 108
 109     case _SC_TIMERS:
 110 #ifdef  _POSIX_TIMERS
 111       return 1;
 112 #else
 113       return -1;
 114 #endif
 115
 116     case _SC_ASYNCHRONOUS_IO:
 117 #ifdef  _POSIX_ASYNCHRONOUS_IO
 118       return 1;
 119 #else
 120       return -1;
 121 #endif
 122
 123     case _SC_PRIORITIZED_IO:
 124 #ifdef  _POSIX_PRIORITIZED_IO
 125       return 1;
 126 #else
 127       return -1;
 128 #endif
 129
 130     case _SC_SYNCHRONIZED_IO:
 131 #ifdef  _POSIX_SYNCHRONIZED_IO
 132       return 1;
 133 #else
 134       return -1;
 135 #endif
 136
 137     case _SC_FSYNC:
 138 #ifdef  _POSIX_FSYNC
 139       return 1;
 140 #else
 141       return -1;
 142 #endif
 143
 144     case _SC_MAPPED_FILES:
 145 #ifdef  _POSIX_MAPPED_FILES
 146       return 1;
 147 #else
 148       return -1;
 149 #endif
 150
 151     case _SC_MEMLOCK:
 152 #ifdef  _POSIX_MEMLOCK
 153       return 1;
 154 #else
 155       return -1;
 156 #endif
 157
 158     case _SC_MEMLOCK_RANGE:
 159 #ifdef  _POSIX_MEMLOCK_RANGE
 160       return 1;
 161 #else
 162       return -1;
 163 #endif
 164
 165     case _SC_MEMORY_PROTECTION:
 166 #ifdef  _POSIX_MEMORY_PROTECTION
 167       return 1;
 168 #else
 169       return -1;
 170 #endif
 171
 172     case _SC_MESSAGE_PASSING:
 173 #ifdef  _POSIX_MESSAGE_PASSING
 174       return 1;
 175 #else
 176       return -1;
 177 #endif
 178
 179     case _SC_SEMAPHORES:
 180 #ifdef  _POSIX_SEMAPHORES
 181       return 1;
 182 #else
 183       return -1;
 184 #endif
 185
 186     case _SC_SHARED_MEMORY_OBJECTS:
 187 #ifdef  _POSIX_SHARED_MEMORY_OBJECTS
 188       return 1;
 189 #else
 190       return -1;
 191 #endif
 192
 193     case _SC_VERSION:
 194       return _POSIX_VERSION;
 195
 196     case _SC_PAGESIZE:
 197       return __getpagesize ();
 198
 199     case _SC_BC_BASE_MAX:
 200 #ifdef  BC_BASE_MAX
 201       return BC_BASE_MAX;
 202 #else
 203       return -1;
 204 #endif
 205
 206     case _SC_BC_DIM_MAX:
 207 #ifdef  BC_DIM_MAX
 208       return BC_DIM_MAX;
 209 #else
 210       return -1;
 211 #endif
 212
 213     case _SC_BC_SCALE_MAX:
 214 #ifdef  BC_SCALE_MAX
 215       return BC_SCALE_MAX;
 216 #else
 217       return -1;
 218 #endif
 219
 220     case _SC_BC_STRING_MAX:
 221 #ifdef  BC_STRING_MAX
 222       return BC_STRING_MAX;
 223 #else
 224       return -1;
 225 #endif
 226
 227     case _SC_EQUIV_CLASS_MAX:
 228 #ifdef  EQUIV_CLASS_MAX
 229       return EQUIV_CLASS_MAX;
 230 #else
 231       return -1;
 232 #endif
 233
 234     case _SC_EXPR_NEST_MAX:
 235 #ifdef  EXPR_NEST_MAX
 236       return EXPR_NEST_MAX;
 237 #else
 238       return -1;
 239 #endif
 240
 241     case _SC_LINE_MAX:
 242 #ifdef  LINE_MAX
 243       return LINE_MAX;
 244 #else
 245       return -1;
 246 #endif
 247
 248     case _SC_RE_DUP_MAX:
 249 #ifdef  RE_DUP_MAX
 250       return RE_DUP_MAX;
 251 #else
 252       return -1;
 253 #endif
 254
 255     case _SC_CHARCLASS_NAME_MAX:
 256 #ifdef  CHARCLASS_NAME_MAX
 257       return CHARCLASS_NAME_MAX;
 258 #else
 259       return -1;
 260 #endif
 261
 262     case _SC_2_VERSION:
 263       /* This is actually supposed to return the version
 264          of the 1003.2 utilities on the system {POSIX2_VERSION}.  */
 265       return _POSIX2_C_VERSION;
 266
 267     case _SC_2_C_BIND:
 268 #ifdef  _POSIX2_C_BIND
 269       return _POSIX2_C_BIND;
 270 #else
 271       return -1;
 272 #endif
 273
 274     case _SC_2_C_DEV:
 275 #ifdef  _POSIX2_C_DEV
 276       return _POSIX2_C_DEV;
 277 #else
 278       return -1;
 279 #endif
 280
 281     case _SC_2_FORT_DEV:
 282 #ifdef  _POSIX2_FORT_DEV
 283       return _POSIX2_FORT_DEV;
 284 #else
 285       return -1;
 286 #endif
 287
 288     case _SC_2_LOCALEDEF:
 289 #ifdef  _POSIX2_LOCALEDEF
 290       return _POSIX2_LOCALEDEF;
 291 #else
 292       return -1;
 293 #endif
 294
 295     case _SC_2_SW_DEV:
 296 #ifdef  _POSIX2_SW_DEV
 297       return _POSIX2_SW_DEV;
 298 #else
 299       return -1;
 300 #endif
 301     }
 302 }
 303
 304 weak_alias (__sysconf, sysconf)