sysdeps/unix/sysv/sysv4/sysconf.c

   1 /* Copyright (C) 1993, 1995, 1996 Free Software Foundation, Inc.
   2    Contributed by Brendan Kehoe (brendan@zen.org).
   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 <errno.h>
  20 #include <limits.h>
  21 #include <unistd.h>
  22 #include <stdio.h>
  23 #include <time.h>
  24 #include <sysconfig.h>
  25
  26 extern int __sysconfig __P ((int));
  27
  28 /* Get the value of the system variable NAME.  */
  29 long int
  30 __sysconf (name)
  31      int name;
  32 {
  33   switch (name)
  34     {
  35     default:
  36       __set_errno (EINVAL);
  37       return -1;
  38
  39     case _SC_ARG_MAX:
  40 #ifdef  ARG_MAX
  41       return ARG_MAX;
  42 #else
  43       return -1;
  44 #endif
  45
  46     case _SC_CHILD_MAX:
  47 #ifdef  CHILD_MAX
  48       return CHILD_MAX;
  49 #else
  50       return -1;
  51 #endif
  52
  53     case _SC_CLK_TCK:
  54       return __sysconfig (_CONFIG_CLK_TCK);
  55
  56     case _SC_NGROUPS_MAX:
  57 #ifdef  NGROUPS_MAX
  58       return NGROUPS_MAX;
  59 #else
  60       return -1;
  61 #endif
  62
  63       /* Both of these are looking for _CONFIG_OPEN_FILES.  */
  64     case _SC_OPEN_MAX:
  65     case _SC_STREAM_MAX:
  66       return __sysconfig (_CONFIG_OPEN_FILES);
  67
  68     case _SC_TZNAME_MAX:
  69       return __tzname_max ();
  70
  71     case _SC_JOB_CONTROL:
  72 #ifdef  _POSIX_JOB_CONTROL
  73       return 1;
  74 #else
  75       return -1;
  76 #endif
  77
  78     case _SC_SAVED_IDS:
  79 #ifdef  _POSIX_SAVED_IDS
  80       return 1;
  81 #else
  82       return -1;
  83 #endif
  84
  85     case _SC_REALTIME_SIGNALS:
  86 #ifdef  _POSIX_REALTIME_SIGNALS
  87       return 1;
  88 #else
  89       return -1;
  90 #endif
  91
  92     case _SC_PRIORITY_SCHEDULING:
  93 #ifdef  _POSIX_PRIORITY_SCHEDULING
  94       return 1;
  95 #else
  96       return -1;
  97 #endif
  98
  99     case _SC_TIMERS:
 100 #ifdef  _POSIX_TIMERS
 101       return 1;
 102 #else
 103       return -1;
 104 #endif
 105
 106     case _SC_ASYNCHRONOUS_IO:
 107 #ifdef  _POSIX_ASYNCHRONOUS_IO
 108       return 1;
 109 #else
 110       return -1;
 111 #endif
 112
 113     case _SC_PRIORITIZED_IO:
 114 #ifdef  _POSIX_PRIORITIZED_IO
 115       return 1;
 116 #else
 117       return -1;
 118 #endif
 119
 120     case _SC_SYNCHRONIZED_IO:
 121 #ifdef  _POSIX_SYNCHRONIZED_IO
 122       return 1;
 123 #else
 124       return -1;
 125 #endif
 126
 127     case _SC_FSYNC:
 128 #ifdef  _POSIX_FSYNC
 129       return 1;
 130 #else
 131       return -1;
 132 #endif
 133
 134     case _SC_MAPPED_FILES:
 135 #ifdef  _POSIX_MAPPED_FILES
 136       return 1;
 137 #else
 138       return -1;
 139 #endif
 140
 141     case _SC_MEMLOCK:
 142 #ifdef  _POSIX_MEMLOCK
 143       return 1;
 144 #else
 145       return -1;
 146 #endif
 147
 148     case _SC_MEMLOCK_RANGE:
 149 #ifdef  _POSIX_MEMLOCK_RANGE
 150       return 1;
 151 #else
 152       return -1;
 153 #endif
 154
 155     case _SC_MEMORY_PROTECTION:
 156 #ifdef  _POSIX_MEMORY_PROTECTION
 157       return 1;
 158 #else
 159       return -1;
 160 #endif
 161
 162     case _SC_MESSAGE_PASSING:
 163 #ifdef  _POSIX_MESSAGE_PASSING
 164       return 1;
 165 #else
 166       return -1;
 167 #endif
 168
 169     case _SC_SEMAPHORES:
 170 #ifdef  _POSIX_SEMAPHORES
 171       return 1;
 172 #else
 173       return -1;
 174 #endif
 175
 176     case _SC_SHARED_MEMORY_OBJECTS:
 177 #ifdef  _POSIX_SHARED_MEMORY_OBJECTS
 178       return 1;
 179 #else
 180       return -1;
 181 #endif
 182
 183     case _SC_VERSION:
 184       return _POSIX_VERSION;
 185
 186     case _SC_PAGESIZE:
 187       return __sysconfig (_CONFIG_PAGESIZE);
 188
 189     case _SC_AIO_LISTIO_MAX:
 190 #ifdef  AIO_LISTIO_MAX
 191       return AIO_LISTIO_MAX;
 192 #else
 193       return -1;
 194 #endif
 195
 196     case _SC_AIO_MAX:
 197 #ifdef  AIO_MAX
 198       return AIO_MAX;
 199 #else
 200       return -1;
 201 #endif
 202
 203     case _SC_AIO_PRIO_DELTA_MAX:
 204 #ifdef  AIO_PRIO_DELTA_MAX
 205       return AIO_PRIO_DELTA_MAX;
 206 #else
 207       return -1;
 208 #endif
 209
 210     case _SC_DELAYTIMER_MAX:
 211 #ifdef  DELAYTIMER_MAX
 212       return DELAYTIMER_MAX;
 213 #else
 214       return -1;
 215 #endif
 216
 217     case _SC_MQ_OPEN_MAX:
 218 #ifdef  MQ_OPEN_MAX
 219       return MQ_OPEN_MAX;
 220 #else
 221       return -1;
 222 #endif
 223
 224     case _SC_MQ_PRIO_MAX:
 225 #ifdef  MQ_PRIO_MAX
 226       return MQ_PRIO_MAX;
 227 #else
 228       return -1;
 229 #endif
 230
 231     case _SC_RTSIG_MAX:
 232 #ifdef  RTSIG_MAX
 233       return RTSIG_MAX;
 234 #else
 235       return -1;
 236 #endif
 237
 238     case _SC_SEM_NSEMS_MAX:
 239 #ifdef  SEM_NSEMS_MAX
 240       return SEM_NSEMS_MAX;
 241 #else
 242       return -1;
 243 #endif
 244
 245     case _SC_SEM_VALUE_MAX:
 246 #ifdef  SEM_VALUE_MAX
 247       return SEM_VALUE_MAX;
 248 #else
 249       return -1;
 250 #endif
 251
 252     case _SC_SIGQUEUE_MAX:
 253 #ifdef  SIGQUEUE_MAX
 254       return SIGQUEUE_MAX;
 255 #else
 256       return -1;
 257 #endif
 258
 259     case _SC_TIMER_MAX:
 260 #ifdef  TIMER_MAX
 261       return TIMER_MAX;
 262 #else
 263       return -1;
 264 #endif
 265
 266     case _SC_BC_BASE_MAX:
 267 #ifdef  BC_BASE_MAX
 268       return BC_BASE_MAX;
 269 #else
 270       return -1;
 271 #endif
 272
 273     case _SC_BC_DIM_MAX:
 274 #ifdef  BC_DIM_MAX
 275       return BC_DIM_MAX;
 276 #else
 277       return -1;
 278 #endif
 279
 280     case _SC_BC_SCALE_MAX:
 281 #ifdef  BC_SCALE_MAX
 282       return BC_SCALE_MAX;
 283 #else
 284       return -1;
 285 #endif
 286
 287     case _SC_BC_STRING_MAX:
 288 #ifdef  BC_STRING_MAX
 289       return BC_STRING_MAX;
 290 #else
 291       return -1;
 292 #endif
 293
 294     case _SC_EQUIV_CLASS_MAX:
 295 #ifdef  EQUIV_CLASS_MAX
 296       return EQUIV_CLASS_MAX;
 297 #else
 298       return -1;
 299 #endif
 300
 301     case _SC_EXPR_NEST_MAX:
 302 #ifdef  EXPR_NEST_MAX
 303       return EXPR_NEST_MAX;
 304 #else
 305       return -1;
 306 #endif
 307
 308     case _SC_LINE_MAX:
 309 #ifdef  LINE_MAX
 310       return LINE_MAX;
 311 #else
 312       return -1;
 313 #endif
 314
 315     case _SC_RE_DUP_MAX:
 316 #ifdef  RE_DUP_MAX
 317       return RE_DUP_MAX;
 318 #else
 319       return -1;
 320 #endif
 321
 322     case _SC_CHARCLASS_NAME_MAX:
 323 #ifdef  CHARCLASS_NAME_MAX
 324       return CHARCLASS_NAME_MAX;
 325 #else
 326       return -1;
 327 #endif
 328
 329     case _SC_2_VERSION:
 330       /* This is actually supposed to return the version
 331          of the 1003.2 utilities on the system {POSIX2_VERSION}.  */
 332       return _POSIX2_C_VERSION;
 333
 334     case _SC_2_C_BIND:
 335 #ifdef  _POSIX2_C_BIND
 336       return _POSIX2_C_BIND;
 337 #else
 338       return -1;
 339 #endif
 340
 341     case _SC_2_C_DEV:
 342 #ifdef  _POSIX2_C_DEV
 343       return _POSIX2_C_DEV;
 344 #else
 345       return -1;
 346 #endif
 347
 348     case _SC_2_FORT_DEV:
 349 #ifdef  _POSIX2_FORT_DEV
 350       return _POSIX2_FORT_DEV;
 351 #else
 352       return -1;
 353 #endif
 354
 355     case _SC_2_SW_DEV:
 356 #ifdef  _POSIX2_SW_DEV
 357       return _POSIX2_SW_DEV;
 358 #else
 359       return -1;
 360 #endif
 361     }
 362 }
 363
 364 weak_alias (__sysconf, sysconf)