sysdeps/unix/sysv/sysv4/sysconf.c

   1 /* Copyright (C) 1993,1995,1996,1997,2002,2004 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Brendan Kehoe (brendan@zen.org).
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <errno.h>
  21 #include <limits.h>
  22 #include <unistd.h>
  23 #include <stdio.h>
  24 #include <time.h>
  25 #include <sysconfig.h>
  26
  27 extern int __sysconfig (int);
  28
  29 /* Get the value of the system variable NAME.  */
  30 long int
  31 __sysconf (name)
  32      int name;
  33 {
  34   switch (name)
  35     {
  36     default:
  37       __set_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       return __sysconfig (_CONFIG_CLK_TCK);
  56
  57     case _SC_NGROUPS_MAX:
  58 #ifdef  NGROUPS_MAX
  59       return NGROUPS_MAX;
  60 #else
  61       return -1;
  62 #endif
  63
  64       /* Both of these are looking for _CONFIG_OPEN_FILES.  */
  65     case _SC_OPEN_MAX:
  66     case _SC_STREAM_MAX:
  67       return __sysconfig (_CONFIG_OPEN_FILES);
  68
  69     case _SC_TZNAME_MAX:
  70       return __tzname_max ();
  71
  72     case _SC_JOB_CONTROL:
  73 #ifdef  _POSIX_JOB_CONTROL
  74       return 1;
  75 #else
  76       return -1;
  77 #endif
  78
  79     case _SC_SAVED_IDS:
  80 #ifdef  _POSIX_SAVED_IDS
  81       return 1;
  82 #else
  83       return -1;
  84 #endif
  85
  86     case _SC_REALTIME_SIGNALS:
  87 #ifdef  _POSIX_REALTIME_SIGNALS
  88       return 1;
  89 #else
  90       return -1;
  91 #endif
  92
  93     case _SC_PRIORITY_SCHEDULING:
  94 #ifdef  _POSIX_PRIORITY_SCHEDULING
  95       return 1;
  96 #else
  97       return -1;
  98 #endif
  99
 100     case _SC_TIMERS:
 101 #ifdef  _POSIX_TIMERS
 102       return 1;
 103 #else
 104       return -1;
 105 #endif
 106
 107     case _SC_ASYNCHRONOUS_IO:
 108 #ifdef  _POSIX_ASYNCHRONOUS_IO
 109       return 1;
 110 #else
 111       return -1;
 112 #endif
 113
 114     case _SC_PRIORITIZED_IO:
 115 #ifdef  _POSIX_PRIORITIZED_IO
 116       return 1;
 117 #else
 118       return -1;
 119 #endif
 120
 121     case _SC_SYNCHRONIZED_IO:
 122 #ifdef  _POSIX_SYNCHRONIZED_IO
 123       return 1;
 124 #else
 125       return -1;
 126 #endif
 127
 128     case _SC_FSYNC:
 129 #ifdef  _POSIX_FSYNC
 130       return 1;
 131 #else
 132       return -1;
 133 #endif
 134
 135     case _SC_MAPPED_FILES:
 136 #ifdef  _POSIX_MAPPED_FILES
 137       return 1;
 138 #else
 139       return -1;
 140 #endif
 141
 142     case _SC_MEMLOCK:
 143 #ifdef  _POSIX_MEMLOCK
 144       return 1;
 145 #else
 146       return -1;
 147 #endif
 148
 149     case _SC_MEMLOCK_RANGE:
 150 #ifdef  _POSIX_MEMLOCK_RANGE
 151       return 1;
 152 #else
 153       return -1;
 154 #endif
 155
 156     case _SC_MEMORY_PROTECTION:
 157 #ifdef  _POSIX_MEMORY_PROTECTION
 158       return 1;
 159 #else
 160       return -1;
 161 #endif
 162
 163     case _SC_MESSAGE_PASSING:
 164 #ifdef  _POSIX_MESSAGE_PASSING
 165       return 1;
 166 #else
 167       return -1;
 168 #endif
 169
 170     case _SC_SEMAPHORES:
 171 #ifdef  _POSIX_SEMAPHORES
 172       return 1;
 173 #else
 174       return -1;
 175 #endif
 176
 177     case _SC_SHARED_MEMORY_OBJECTS:
 178 #ifdef  _POSIX_SHARED_MEMORY_OBJECTS
 179       return 1;
 180 #else
 181       return -1;
 182 #endif
 183
 184     case _SC_VERSION:
 185       return _POSIX_VERSION;
 186
 187     case _SC_PAGESIZE:
 188       return __sysconfig (_CONFIG_PAGESIZE);
 189
 190     case _SC_AIO_LISTIO_MAX:
 191 #ifdef  AIO_LISTIO_MAX
 192       return AIO_LISTIO_MAX;
 193 #else
 194       return -1;
 195 #endif
 196
 197     case _SC_AIO_MAX:
 198 #ifdef  AIO_MAX
 199       return AIO_MAX;
 200 #else
 201       return -1;
 202 #endif
 203
 204     case _SC_AIO_PRIO_DELTA_MAX:
 205 #ifdef  AIO_PRIO_DELTA_MAX
 206       return AIO_PRIO_DELTA_MAX;
 207 #else
 208       return -1;
 209 #endif
 210
 211     case _SC_DELAYTIMER_MAX:
 212 #ifdef  DELAYTIMER_MAX
 213       return DELAYTIMER_MAX;
 214 #else
 215       return -1;
 216 #endif
 217
 218     case _SC_MQ_OPEN_MAX:
 219 #ifdef  MQ_OPEN_MAX
 220       return MQ_OPEN_MAX;
 221 #else
 222       return -1;
 223 #endif
 224
 225     case _SC_MQ_PRIO_MAX:
 226 #ifdef  MQ_PRIO_MAX
 227       return MQ_PRIO_MAX;
 228 #else
 229       return -1;
 230 #endif
 231
 232     case _SC_RTSIG_MAX:
 233 #ifdef  RTSIG_MAX
 234       return RTSIG_MAX;
 235 #else
 236       return -1;
 237 #endif
 238
 239     case _SC_SEM_NSEMS_MAX:
 240 #ifdef  SEM_NSEMS_MAX
 241       return SEM_NSEMS_MAX;
 242 #else
 243       return -1;
 244 #endif
 245
 246     case _SC_SEM_VALUE_MAX:
 247 #ifdef  SEM_VALUE_MAX
 248       return SEM_VALUE_MAX;
 249 #else
 250       return -1;
 251 #endif
 252
 253     case _SC_SIGQUEUE_MAX:
 254 #ifdef  SIGQUEUE_MAX
 255       return SIGQUEUE_MAX;
 256 #else
 257       return -1;
 258 #endif
 259
 260     case _SC_TIMER_MAX:
 261 #ifdef  TIMER_MAX
 262       return TIMER_MAX;
 263 #else
 264       return -1;
 265 #endif
 266
 267     case _SC_BC_BASE_MAX:
 268 #ifdef  BC_BASE_MAX
 269       return BC_BASE_MAX;
 270 #else
 271       return -1;
 272 #endif
 273
 274     case _SC_BC_DIM_MAX:
 275 #ifdef  BC_DIM_MAX
 276       return BC_DIM_MAX;
 277 #else
 278       return -1;
 279 #endif
 280
 281     case _SC_BC_SCALE_MAX:
 282 #ifdef  BC_SCALE_MAX
 283       return BC_SCALE_MAX;
 284 #else
 285       return -1;
 286 #endif
 287
 288     case _SC_BC_STRING_MAX:
 289 #ifdef  BC_STRING_MAX
 290       return BC_STRING_MAX;
 291 #else
 292       return -1;
 293 #endif
 294
 295     case _SC_EQUIV_CLASS_MAX:
 296 #ifdef  EQUIV_CLASS_MAX
 297       return EQUIV_CLASS_MAX;
 298 #else
 299       return -1;
 300 #endif
 301
 302     case _SC_EXPR_NEST_MAX:
 303 #ifdef  EXPR_NEST_MAX
 304       return EXPR_NEST_MAX;
 305 #else
 306       return -1;
 307 #endif
 308
 309     case _SC_LINE_MAX:
 310 #ifdef  LINE_MAX
 311       return LINE_MAX;
 312 #else
 313       return -1;
 314 #endif
 315
 316     case _SC_RE_DUP_MAX:
 317 #ifdef  RE_DUP_MAX
 318       return RE_DUP_MAX;
 319 #else
 320       return -1;
 321 #endif
 322
 323     case _SC_CHARCLASS_NAME_MAX:
 324 #ifdef  CHARCLASS_NAME_MAX
 325       return CHARCLASS_NAME_MAX;
 326 #else
 327       return -1;
 328 #endif
 329
 330     case _SC_2_VERSION:
 331       /* This is actually supposed to return the version
 332          of the 1003.2 utilities on the system {POSIX2_VERSION}.  */
 333       return _POSIX2_C_VERSION;
 334
 335     case _SC_2_C_BIND:
 336 #ifdef  _POSIX2_C_BIND
 337       return _POSIX2_C_BIND;
 338 #else
 339       return -1;
 340 #endif
 341
 342     case _SC_2_C_DEV:
 343 #ifdef  _POSIX2_C_DEV
 344       return _POSIX2_C_DEV;
 345 #else
 346       return -1;
 347 #endif
 348
 349     case _SC_2_FORT_DEV:
 350 #ifdef  _POSIX2_FORT_DEV
 351       return _POSIX2_FORT_DEV;
 352 #else
 353       return -1;
 354 #endif
 355
 356     case _SC_2_SW_DEV:
 357 #ifdef  _POSIX2_SW_DEV
 358       return _POSIX2_SW_DEV;
 359 #else
 360       return -1;
 361 #endif
 362     }
 363 }
 364
 365 weak_alias (__sysconf, sysconf)
 366 libc_hidden_def (__sysconf)