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 <errno.h>
  20 #include <limits.h>
  21 #include <grp.h>
  22 #include <pwd.h>
  23 #include <stddef.h>
  24 #include <stdio.h>
  25 #include <time.h>
  26 #include <unistd.h>
  27
  28 extern int __getdtablesize __P ((void));
  29 extern size_t __getpagesize __P ((void));
  30
  31 /* Get the value of the system variable NAME.  */
  32 long int
  33 __sysconf (name)
  34      int name;
  35 {
  36   switch (name)
  37     {
  38     default:
  39       errno = EINVAL;
  40       return -1;
  41
  42     case _SC_ARG_MAX:
  43 #ifdef  ARG_MAX
  44       return ARG_MAX;
  45 #else
  46       return -1;
  47 #endif
  48
  49     case _SC_CHILD_MAX:
  50 #ifdef  CHILD_MAX
  51       return CHILD_MAX;
  52 #else
  53       return -1;
  54 #endif
  55
  56     case _SC_CLK_TCK:
  57 #ifdef  CLK_TCK
  58       return CLK_TCK;
  59 #else
  60       return 60;
  61 #endif
  62
  63     case _SC_NGROUPS_MAX:
  64 #ifdef  NGROUPS_MAX
  65       return NGROUPS_MAX;
  66 #else
  67       return -1;
  68 #endif
  69
  70     case _SC_OPEN_MAX:
  71       return __getdtablesize ();
  72
  73     case _SC_STREAM_MAX:
  74 #ifdef  STREAM_MAX
  75       return STREAM_MAX;
  76 #else
  77       return FOPEN_MAX;
  78 #endif
  79
  80     case _SC_TZNAME_MAX:
  81       return __tzname_max ();
  82
  83     case _SC_JOB_CONTROL:
  84 #ifdef  _POSIX_JOB_CONTROL
  85       return 1;
  86 #else
  87       return -1;
  88 #endif
  89
  90     case _SC_SAVED_IDS:
  91 #ifdef  _POSIX_SAVED_IDS
  92       return 1;
  93 #else
  94       return -1;
  95 #endif
  96
  97     case _SC_REALTIME_SIGNALS:
  98 #ifdef  _POSIX_REALTIME_SIGNALS
  99       return 1;
 100 #else
 101       return -1;
 102 #endif
 103
 104     case _SC_PRIORITY_SCHEDULING:
 105 #ifdef  _POSIX_PRIORITY_SCHEDULING
 106       return 1;
 107 #else
 108       return -1;
 109 #endif
 110
 111     case _SC_TIMERS:
 112 #ifdef  _POSIX_TIMERS
 113       return 1;
 114 #else
 115       return -1;
 116 #endif
 117
 118     case _SC_ASYNCHRONOUS_IO:
 119 #ifdef  _POSIX_ASYNCHRONOUS_IO
 120       return 1;
 121 #else
 122       return -1;
 123 #endif
 124
 125     case _SC_PRIORITIZED_IO:
 126 #ifdef  _POSIX_PRIORITIZED_IO
 127       return 1;
 128 #else
 129       return -1;
 130 #endif
 131
 132     case _SC_SYNCHRONIZED_IO:
 133 #ifdef  _POSIX_SYNCHRONIZED_IO
 134       return 1;
 135 #else
 136       return -1;
 137 #endif
 138
 139     case _SC_FSYNC:
 140 #ifdef  _POSIX_FSYNC
 141       return 1;
 142 #else
 143       return -1;
 144 #endif
 145
 146     case _SC_MAPPED_FILES:
 147 #ifdef  _POSIX_MAPPED_FILES
 148       return 1;
 149 #else
 150       return -1;
 151 #endif
 152
 153     case _SC_MEMLOCK:
 154 #ifdef  _POSIX_MEMLOCK
 155       return 1;
 156 #else
 157       return -1;
 158 #endif
 159
 160     case _SC_MEMLOCK_RANGE:
 161 #ifdef  _POSIX_MEMLOCK_RANGE
 162       return 1;
 163 #else
 164       return -1;
 165 #endif
 166
 167     case _SC_MEMORY_PROTECTION:
 168 #ifdef  _POSIX_MEMORY_PROTECTION
 169       return 1;
 170 #else
 171       return -1;
 172 #endif
 173
 174     case _SC_MESSAGE_PASSING:
 175 #ifdef  _POSIX_MESSAGE_PASSING
 176       return 1;
 177 #else
 178       return -1;
 179 #endif
 180
 181     case _SC_SEMAPHORES:
 182 #ifdef  _POSIX_SEMAPHORES
 183       return 1;
 184 #else
 185       return -1;
 186 #endif
 187
 188     case _SC_SHARED_MEMORY_OBJECTS:
 189 #ifdef  _POSIX_SHARED_MEMORY_OBJECTS
 190       return 1;
 191 #else
 192       return -1;
 193 #endif
 194
 195     case _SC_VERSION:
 196       return _POSIX_VERSION;
 197
 198     case _SC_PAGESIZE:
 199       return __getpagesize ();
 200
 201     case _SC_AIO_LISTIO_MAX:
 202 #ifdef  AIO_LISTIO_MAX
 203       return AIO_LISTIO_MAX;
 204 #else
 205       return -1;
 206 #endif
 207
 208     case _SC_AIO_MAX:
 209 #ifdef  AIO_MAX
 210       return AIO_MAX;
 211 #else
 212       return -1;
 213 #endif
 214
 215     case _SC_AIO_PRIO_DELTA_MAX:
 216 #ifdef  AIO_PRIO_DELTA_MAX
 217       return AIO_PRIO_DELTA_MAX;
 218 #else
 219       return -1;
 220 #endif
 221
 222     case _SC_DELAYTIMER_MAX:
 223 #ifdef  DELAYTIMER_MAX
 224       return DELAYTIMER_MAX;
 225 #else
 226       return -1;
 227 #endif
 228
 229     case _SC_MQ_OPEN_MAX:
 230 #ifdef  MQ_OPEN_MAX
 231       return MQ_OPEN_MAX;
 232 #else
 233       return -1;
 234 #endif
 235
 236     case _SC_MQ_PRIO_MAX:
 237 #ifdef  MQ_PRIO_MAX
 238       return MQ_PRIO_MAX;
 239 #else
 240       return -1;
 241 #endif
 242
 243     case _SC_RTSIG_MAX:
 244 #ifdef  RTSIG_MAX
 245       return RTSIG_MAX;
 246 #else
 247       return -1;
 248 #endif
 249
 250     case _SC_SEM_NSEMS_MAX:
 251 #ifdef  SEM_NSEMS_MAX
 252       return SEM_NSEMS_MAX;
 253 #else
 254       return -1;
 255 #endif
 256
 257     case _SC_SEM_VALUE_MAX:
 258 #ifdef  SEM_VALUE_MAX
 259       return SEM_VALUE_MAX;
 260 #else
 261       return -1;
 262 #endif
 263
 264     case _SC_SIGQUEUE_MAX:
 265 #ifdef  SIGQUEUE_MAX
 266       return SIGQUEUE_MAX;
 267 #else
 268       return -1;
 269 #endif
 270
 271     case _SC_TIMER_MAX:
 272 #ifdef  TIMER_MAX
 273       return TIMER_MAX;
 274 #else
 275       return -1;
 276 #endif
 277
 278     case _SC_BC_BASE_MAX:
 279 #ifdef  BC_BASE_MAX
 280       return BC_BASE_MAX;
 281 #else
 282       return -1;
 283 #endif
 284
 285     case _SC_BC_DIM_MAX:
 286 #ifdef  BC_DIM_MAX
 287       return BC_DIM_MAX;
 288 #else
 289       return -1;
 290 #endif
 291
 292     case _SC_BC_SCALE_MAX:
 293 #ifdef  BC_SCALE_MAX
 294       return BC_SCALE_MAX;
 295 #else
 296       return -1;
 297 #endif
 298
 299     case _SC_BC_STRING_MAX:
 300 #ifdef  BC_STRING_MAX
 301       return BC_STRING_MAX;
 302 #else
 303       return -1;
 304 #endif
 305
 306     case _SC_COLL_WEIGHTS_MAX:
 307 #ifdef  COLL_WEIGHTS_MAX
 308       return COLL_WEIGHTS_MAX;
 309 #else
 310       return -1;
 311 #endif
 312
 313     case _SC_EQUIV_CLASS_MAX:
 314 #ifdef  EQUIV_CLASS_MAX
 315       return EQUIV_CLASS_MAX;
 316 #else
 317       return -1;
 318 #endif
 319
 320     case _SC_EXPR_NEST_MAX:
 321 #ifdef  EXPR_NEST_MAX
 322       return EXPR_NEST_MAX;
 323 #else
 324       return -1;
 325 #endif
 326
 327     case _SC_LINE_MAX:
 328 #ifdef  LINE_MAX
 329       return LINE_MAX;
 330 #else
 331       return -1;
 332 #endif
 333
 334     case _SC_RE_DUP_MAX:
 335 #ifdef  RE_DUP_MAX
 336       return RE_DUP_MAX;
 337 #else
 338       return -1;
 339 #endif
 340
 341     case _SC_CHARCLASS_NAME_MAX:
 342 #ifdef  CHARCLASS_NAME_MAX
 343       return CHARCLASS_NAME_MAX;
 344 #else
 345       return -1;
 346 #endif
 347
 348     case _SC_PII:
 349 #ifdef  _POSIX_PII
 350       return 1;
 351 #else
 352       return -1;
 353 #endif
 354
 355     case _SC_PII_XTI:
 356 #ifdef  _POSIX_PII_XTI
 357       return 1;
 358 #else
 359       return -1;
 360 #endif
 361
 362     case _SC_PII_SOCKET:
 363 #ifdef  _POSIX_PII_SOCKET
 364       return 1;
 365 #else
 366       return -1;
 367 #endif
 368
 369     case _SC_PII_INTERNET:
 370 #ifdef  _POSIX_PII_INTERNET
 371       return 1;
 372 #else
 373       return -1;
 374 #endif
 375
 376     case _SC_PII_OSI:
 377 #ifdef  _POSIX_PII_OSI
 378       return 1;
 379 #else
 380       return -1;
 381 #endif
 382
 383     case _SC_POLL:
 384 #ifdef  _POSIX_POLL
 385       return 1;
 386 #else
 387       return -1;
 388 #endif
 389
 390     case _SC_SELECT:
 391 #ifdef  _POSIX_SELECT
 392       return 1;
 393 #else
 394       return -1;
 395 #endif
 396
 397     case _SC_UIO_MAXIOV:
 398 #ifdef  UIO_MAXIOV
 399       return UIO_MAXIOV;
 400 #else
 401       return -1;
 402 #endif
 403
 404     case _SC_PII_INTERNET_STREAM:
 405 #ifdef  _POSIX_PII_INTERNET_STREAM
 406       return 1;
 407 #else
 408       return -1;
 409 #endif
 410
 411     case _SC_PII_INTERNET_DGRAM:
 412 #ifdef  _POSIX_PII_INTERNET_DGRAM
 413       return 1;
 414 #else
 415       return -1;
 416 #endif
 417
 418     case _SC_PII_OSI_COTS:
 419 #ifdef  _POSIX_PII_OSI_COTS
 420       return 1;
 421 #else
 422       return -1;
 423 #endif
 424
 425     case _SC_PII_OSI_CLTS:
 426 #ifdef  _POSIX_PII_OSI_CLTS
 427       return 1;
 428 #else
 429       return -1;
 430 #endif
 431
 432     case _SC_PII_OSI_M:
 433 #ifdef  _POSIX_PII_OSI_M
 434       return 1;
 435 #else
 436       return -1;
 437 #endif
 438
 439     case _SC_T_IOV_MAX:
 440 #ifdef  _T_IOV_MAX
 441       return _T_IOV_MAX;
 442 #else
 443       return -1;
 444 #endif
 445
 446     case _SC_2_VERSION:
 447       /* This is actually supposed to return the version
 448          of the 1003.2 utilities on the system {POSIX2_VERSION}.  */
 449       return _POSIX2_C_VERSION;
 450
 451     case _SC_2_C_BIND:
 452 #ifdef  _POSIX2_C_BIND
 453       return _POSIX2_C_BIND;
 454 #else
 455       return -1;
 456 #endif
 457
 458     case _SC_2_C_DEV:
 459 #ifdef  _POSIX2_C_DEV
 460       return _POSIX2_C_DEV;
 461 #else
 462       return -1;
 463 #endif
 464
 465     case _SC_2_FORT_DEV:
 466 #ifdef  _POSIX2_FORT_DEV
 467       return _POSIX2_FORT_DEV;
 468 #else
 469       return -1;
 470 #endif
 471
 472     case _SC_2_LOCALEDEF:
 473 #ifdef  _POSIX2_LOCALEDEF
 474       return _POSIX2_LOCALEDEF;
 475 #else
 476       return -1;
 477 #endif
 478
 479     case _SC_2_SW_DEV:
 480 #ifdef  _POSIX2_SW_DEV
 481       return _POSIX2_SW_DEV;
 482 #else
 483       return -1;
 484 #endif
 485
 486       /* POSIX 1003.1c (POSIX Threads).  */
 487     case _SC_THREADS:
 488 #ifdef  _POSIX_THREADS
 489       return 1;
 490 #else
 491       return -1;
 492 #endif
 493
 494     case _SC_THREAD_SAFE_FUNCTIONS:
 495 #ifdef  _POSIX_THREAD_SAFE_FUNCTIONS
 496       return 1;
 497 #else
 498       return -1;
 499 #endif
 500
 501     case _SC_GETGR_R_SIZE_MAX:
 502 #ifdef  NSS_BUFLEN_GROUP
 503       return NSS_BUFLEN_GROUP;
 504 #else
 505       return -1;
 506 #endif
 507
 508     case _SC_GETPW_R_SIZE_MAX:
 509 #ifdef  NSS_BUFLEN_PASSWD
 510       return NSS_BUFLEN_PASSWD;
 511 #else
 512       return -1;
 513 #endif
 514
 515     case _SC_LOGIN_NAME_MAX:
 516 #ifdef  _POSIX_LOGIN_NAME_MAX
 517       return _POSIX_LOGIN_NAME_MAX;
 518 #else
 519       return -1;
 520 #endif
 521
 522     case _SC_TTY_NAME_MAX:
 523 #ifdef  _POSIX_TTY_NAME_MAX
 524       return _POSIX_TTY_NAME_MAX;
 525 #else
 526       return -1;
 527 #endif
 528
 529     case _SC_THREAD_DESTRUCTOR_ITERATIONS:
 530 #ifdef  _POSIX_THREAD_DESTRUCTOR_ITERATIONS
 531       return _POSIX_THREAD_DESTRUCTOR_ITERATIONS;
 532 #else
 533       return -1;
 534 #endif
 535
 536     case _SC_THREAD_KEYS_MAX:
 537 #ifdef  PTHREAD_KEYS_MAX
 538       return PTHREAD_KEYS_MAX;
 539 #else
 540       return -1;
 541 #endif
 542
 543     case _SC_THREAD_STACK_MIN:
 544 #ifdef  PTHREAD_STACK_MIN
 545       return PTHREAD_STACK_MIN;
 546 #else
 547       return -1;
 548 #endif
 549
 550     case _SC_THREAD_THREADS_MAX:
 551 #ifdef  PTHREAD_THREADS_MAX
 552       return PTHREAD_THREADS_MAX;
 553 #else
 554       return -1;
 555 #endif
 556
 557     case _SC_THREAD_ATTR_STACKADDR:
 558 #ifdef  _POSIX_THREAD_ATTR_STACKADDR
 559       return 1;
 560 #else
 561       return -1;
 562 #endif
 563
 564     case _SC_THREAD_ATTR_STACKSIZE:
 565 #ifdef  _POSIX_THREAD_ATTR_STACKSIZE
 566       return 1;
 567 #else
 568       return -1;
 569 #endif
 570
 571     case _SC_THREAD_PRIORITY_SCHEDULING:
 572 #ifdef  _POSIX_THREAD_PRIORITY_SCHEDULING
 573       return 1;
 574 #else
 575       return -1;
 576 #endif
 577
 578     case _SC_THREAD_PRIO_INHERIT:
 579 #ifdef  _POSIX_THREAD_PRIO_INHERIT
 580       return 1;
 581 #else
 582       return -1;
 583 #endif
 584
 585     case _SC_THREAD_PRIO_PROTECT:
 586 #ifdef  _POSIX_THREAD_PRIO_PROTECT
 587       return 1;
 588 #else
 589       return -1;
 590 #endif
 591
 592     case _SC_THREAD_PROCESS_SHARED:
 593 #ifdef  _POSIX_THREAD_PROCESS_SHARED
 594       return 1;
 595 #else
 596       return -1;
 597 #endif
 598     }
 599 }
 600
 601 weak_alias (__sysconf, sysconf)