sysdeps/posix/sysconf.c

   1 /* Copyright (C) 1991,1993,1995-1997,1999-2003,2004
   2    Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   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 <grp.h>
  23 #include <pwd.h>
  24 #include <stddef.h>
  25 #include <stdio.h>
  26 #include <time.h>
  27 #include <unistd.h>
  28 #include <sys/param.h>
  29 #include <sys/sysinfo.h>
  30 #include <sys/types.h>
  31 #include <regex.h>
  32
  33
  34 /* Get the value of the system variable NAME.  */
  35 long int
  36 __sysconf (name)
  37      int name;
  38 {
  39   switch (name)
  40     {
  41       /* Also add obsolete or unnecessarily added constants here.  */
  42     case _SC_EQUIV_CLASS_MAX:
  43     default:
  44       __set_errno (EINVAL);
  45       return -1;
  46
  47     case _SC_ARG_MAX:
  48 #ifdef  ARG_MAX
  49       return ARG_MAX;
  50 #else
  51       return -1;
  52 #endif
  53
  54     case _SC_CHILD_MAX:
  55 #ifdef  CHILD_MAX
  56       return CHILD_MAX;
  57 #else
  58       return -1;
  59 #endif
  60
  61     case _SC_CLK_TCK:
  62       return __getclktck ();
  63
  64     case _SC_NGROUPS_MAX:
  65 #ifdef  NGROUPS_MAX
  66       return NGROUPS_MAX;
  67 #else
  68       return -1;
  69 #endif
  70
  71     case _SC_OPEN_MAX:
  72       return __getdtablesize ();
  73
  74     case _SC_STREAM_MAX:
  75 #ifdef  STREAM_MAX
  76       return STREAM_MAX;
  77 #else
  78       return FOPEN_MAX;
  79 #endif
  80
  81     case _SC_TZNAME_MAX:
  82       return MAX (__tzname_max (), _POSIX_TZNAME_MAX);
  83
  84     case _SC_JOB_CONTROL:
  85 #ifdef  _POSIX_JOB_CONTROL
  86       return 1;
  87 #else
  88       return -1;
  89 #endif
  90
  91     case _SC_SAVED_IDS:
  92 #ifdef  _POSIX_SAVED_IDS
  93       return 1;
  94 #else
  95       return -1;
  96 #endif
  97
  98     case _SC_REALTIME_SIGNALS:
  99 #ifdef  _POSIX_REALTIME_SIGNALS
 100       return _POSIX_REALTIME_SIGNALS;
 101 #else
 102       return -1;
 103 #endif
 104
 105     case _SC_PRIORITY_SCHEDULING:
 106 #ifdef  _POSIX_PRIORITY_SCHEDULING
 107       return _POSIX_PRIORITY_SCHEDULING;
 108 #else
 109       return -1;
 110 #endif
 111
 112     case _SC_TIMERS:
 113 #ifdef  _POSIX_TIMERS
 114       return _POSIX_TIMERS;
 115 #else
 116       return -1;
 117 #endif
 118
 119     case _SC_ASYNCHRONOUS_IO:
 120 #ifdef  _POSIX_ASYNCHRONOUS_IO
 121       return _POSIX_ASYNCHRONOUS_IO;
 122 #else
 123       return -1;
 124 #endif
 125
 126     case _SC_PRIORITIZED_IO:
 127 #ifdef  _POSIX_PRIORITIZED_IO
 128       return _POSIX_PRIORITIZED_IO;
 129 #else
 130       return -1;
 131 #endif
 132
 133     case _SC_SYNCHRONIZED_IO:
 134 #ifdef  _POSIX_SYNCHRONIZED_IO
 135       return _POSIX_SYNCHRONIZED_IO;
 136 #else
 137       return -1;
 138 #endif
 139
 140     case _SC_FSYNC:
 141 #ifdef  _POSIX_FSYNC
 142       return _POSIX_FSYNC;
 143 #else
 144       return -1;
 145 #endif
 146
 147     case _SC_MAPPED_FILES:
 148 #ifdef  _POSIX_MAPPED_FILES
 149       return _POSIX_MAPPED_FILES;
 150 #else
 151       return -1;
 152 #endif
 153
 154     case _SC_MEMLOCK:
 155 #ifdef  _POSIX_MEMLOCK
 156       return _POSIX_MEMLOCK;
 157 #else
 158       return -1;
 159 #endif
 160
 161     case _SC_MEMLOCK_RANGE:
 162 #ifdef  _POSIX_MEMLOCK_RANGE
 163       return _POSIX_MEMLOCK_RANGE;
 164 #else
 165       return -1;
 166 #endif
 167
 168     case _SC_MEMORY_PROTECTION:
 169 #ifdef  _POSIX_MEMORY_PROTECTION
 170       return _POSIX_MEMORY_PROTECTION;
 171 #else
 172       return -1;
 173 #endif
 174
 175     case _SC_MESSAGE_PASSING:
 176 #ifdef  _POSIX_MESSAGE_PASSING
 177       return _POSIX_MESSAGE_PASSING;
 178 #else
 179       return -1;
 180 #endif
 181
 182     case _SC_SEMAPHORES:
 183 #ifdef  _POSIX_SEMAPHORES
 184       return _POSIX_SEMAPHORES;
 185 #else
 186       return -1;
 187 #endif
 188
 189     case _SC_SHARED_MEMORY_OBJECTS:
 190 #ifdef  _POSIX_SHARED_MEMORY_OBJECTS
 191       return _POSIX_SHARED_MEMORY_OBJECTS;
 192 #else
 193       return -1;
 194 #endif
 195
 196     case _SC_VERSION:
 197       return _POSIX_VERSION;
 198
 199     case _SC_PAGESIZE:
 200       return __getpagesize ();
 201
 202     case _SC_AIO_LISTIO_MAX:
 203 #ifdef  AIO_LISTIO_MAX
 204       return AIO_LISTIO_MAX;
 205 #else
 206       return -1;
 207 #endif
 208
 209     case _SC_AIO_MAX:
 210 #ifdef  AIO_MAX
 211       return AIO_MAX;
 212 #else
 213       return -1;
 214 #endif
 215
 216     case _SC_AIO_PRIO_DELTA_MAX:
 217 #ifdef  AIO_PRIO_DELTA_MAX
 218       return AIO_PRIO_DELTA_MAX;
 219 #else
 220       return -1;
 221 #endif
 222
 223     case _SC_DELAYTIMER_MAX:
 224 #ifdef  DELAYTIMER_MAX
 225       return DELAYTIMER_MAX;
 226 #else
 227       return -1;
 228 #endif
 229
 230     case _SC_MQ_OPEN_MAX:
 231 #ifdef  MQ_OPEN_MAX
 232       return MQ_OPEN_MAX;
 233 #else
 234       return -1;
 235 #endif
 236
 237     case _SC_MQ_PRIO_MAX:
 238 #ifdef  MQ_PRIO_MAX
 239       return MQ_PRIO_MAX;
 240 #else
 241       return -1;
 242 #endif
 243
 244     case _SC_RTSIG_MAX:
 245 #ifdef  RTSIG_MAX
 246       return RTSIG_MAX;
 247 #else
 248       return -1;
 249 #endif
 250
 251     case _SC_SEM_NSEMS_MAX:
 252 #ifdef  SEM_NSEMS_MAX
 253       return SEM_NSEMS_MAX;
 254 #else
 255       return -1;
 256 #endif
 257
 258     case _SC_SEM_VALUE_MAX:
 259 #ifdef  SEM_VALUE_MAX
 260       return SEM_VALUE_MAX;
 261 #else
 262       return -1;
 263 #endif
 264
 265     case _SC_SIGQUEUE_MAX:
 266 #ifdef  SIGQUEUE_MAX
 267       return SIGQUEUE_MAX;
 268 #else
 269       return -1;
 270 #endif
 271
 272     case _SC_TIMER_MAX:
 273 #ifdef  TIMER_MAX
 274       return TIMER_MAX;
 275 #else
 276       return -1;
 277 #endif
 278
 279     case _SC_BC_BASE_MAX:
 280 #ifdef  BC_BASE_MAX
 281       return BC_BASE_MAX;
 282 #else
 283       return -1;
 284 #endif
 285
 286     case _SC_BC_DIM_MAX:
 287 #ifdef  BC_DIM_MAX
 288       return BC_DIM_MAX;
 289 #else
 290       return -1;
 291 #endif
 292
 293     case _SC_BC_SCALE_MAX:
 294 #ifdef  BC_SCALE_MAX
 295       return BC_SCALE_MAX;
 296 #else
 297       return -1;
 298 #endif
 299
 300     case _SC_BC_STRING_MAX:
 301 #ifdef  BC_STRING_MAX
 302       return BC_STRING_MAX;
 303 #else
 304       return -1;
 305 #endif
 306
 307     case _SC_COLL_WEIGHTS_MAX:
 308 #ifdef  COLL_WEIGHTS_MAX
 309       return COLL_WEIGHTS_MAX;
 310 #else
 311       return -1;
 312 #endif
 313
 314     case _SC_EXPR_NEST_MAX:
 315 #ifdef  EXPR_NEST_MAX
 316       return EXPR_NEST_MAX;
 317 #else
 318       return -1;
 319 #endif
 320
 321     case _SC_LINE_MAX:
 322 #ifdef  LINE_MAX
 323       return LINE_MAX;
 324 #else
 325       return -1;
 326 #endif
 327
 328     case _SC_RE_DUP_MAX:
 329 #ifdef  RE_DUP_MAX
 330       return RE_DUP_MAX;
 331 #else
 332       return -1;
 333 #endif
 334
 335     case _SC_CHARCLASS_NAME_MAX:
 336 #ifdef  CHARCLASS_NAME_MAX
 337       return CHARCLASS_NAME_MAX;
 338 #else
 339       return -1;
 340 #endif
 341
 342     case _SC_PII:
 343 #ifdef  _POSIX_PII
 344       return 1;
 345 #else
 346       return -1;
 347 #endif
 348
 349     case _SC_PII_XTI:
 350 #ifdef  _POSIX_PII_XTI
 351       return 1;
 352 #else
 353       return -1;
 354 #endif
 355
 356     case _SC_PII_SOCKET:
 357 #ifdef  _POSIX_PII_SOCKET
 358       return 1;
 359 #else
 360       return -1;
 361 #endif
 362
 363     case _SC_PII_INTERNET:
 364 #ifdef  _POSIX_PII_INTERNET
 365       return 1;
 366 #else
 367       return -1;
 368 #endif
 369
 370     case _SC_PII_OSI:
 371 #ifdef  _POSIX_PII_OSI
 372       return 1;
 373 #else
 374       return -1;
 375 #endif
 376
 377     case _SC_POLL:
 378 #ifdef  _POSIX_POLL
 379       return 1;
 380 #else
 381       return -1;
 382 #endif
 383
 384     case _SC_SELECT:
 385 #ifdef  _POSIX_SELECT
 386       return 1;
 387 #else
 388       return -1;
 389 #endif
 390
 391       /* The same as _SC_IOV_MAX.  */
 392     case _SC_UIO_MAXIOV:
 393 #ifdef  UIO_MAXIOV
 394       return UIO_MAXIOV;
 395 #else
 396       return -1;
 397 #endif
 398
 399     case _SC_PII_INTERNET_STREAM:
 400 #ifdef  _POSIX_PII_INTERNET_STREAM
 401       return 1;
 402 #else
 403       return -1;
 404 #endif
 405
 406     case _SC_PII_INTERNET_DGRAM:
 407 #ifdef  _POSIX_PII_INTERNET_DGRAM
 408       return 1;
 409 #else
 410       return -1;
 411 #endif
 412
 413     case _SC_PII_OSI_COTS:
 414 #ifdef  _POSIX_PII_OSI_COTS
 415       return 1;
 416 #else
 417       return -1;
 418 #endif
 419
 420     case _SC_PII_OSI_CLTS:
 421 #ifdef  _POSIX_PII_OSI_CLTS
 422       return 1;
 423 #else
 424       return -1;
 425 #endif
 426
 427     case _SC_PII_OSI_M:
 428 #ifdef  _POSIX_PII_OSI_M
 429       return 1;
 430 #else
 431       return -1;
 432 #endif
 433
 434     case _SC_T_IOV_MAX:
 435 #ifdef  _T_IOV_MAX
 436       return _T_IOV_MAX;
 437 #else
 438       return -1;
 439 #endif
 440
 441     case _SC_2_VERSION:
 442       return _POSIX2_VERSION;
 443
 444     case _SC_2_C_BIND:
 445 #ifdef  _POSIX2_C_BIND
 446       return _POSIX2_C_BIND;
 447 #else
 448       return -1;
 449 #endif
 450
 451     case _SC_2_C_DEV:
 452 #ifdef  _POSIX2_C_DEV
 453       return _POSIX2_C_DEV;
 454 #else
 455       return -1;
 456 #endif
 457
 458     case _SC_2_C_VERSION:
 459 #ifdef  _POSIX2_C_VERSION
 460       return _POSIX2_C_VERSION;
 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_FORT_RUN:
 473 #ifdef  _POSIX2_FORT_RUN
 474       return _POSIX2_FORT_RUN;
 475 #else
 476       return -1;
 477 #endif
 478
 479     case _SC_2_LOCALEDEF:
 480 #ifdef  _POSIX2_LOCALEDEF
 481       return _POSIX2_LOCALEDEF;
 482 #else
 483       return -1;
 484 #endif
 485
 486     case _SC_2_SW_DEV:
 487 #ifdef  _POSIX2_SW_DEV
 488       return _POSIX2_SW_DEV;
 489 #else
 490       return -1;
 491 #endif
 492
 493     case _SC_2_CHAR_TERM:
 494 #ifdef  _POSIX2_CHAR_TERM
 495       return _POSIX2_CHAR_TERM;
 496 #else
 497       return -1;
 498 #endif
 499
 500     case _SC_2_UPE:
 501 #ifdef  _POSIX2_UPE
 502       return _POSIX2_UPE;
 503 #else
 504       return -1;
 505 #endif
 506
 507       /* POSIX 1003.1c (POSIX Threads).  */
 508     case _SC_THREADS:
 509 #ifdef  _POSIX_THREADS
 510       return _POSIX_THREADS;
 511 #else
 512       return -1;
 513 #endif
 514
 515     case _SC_THREAD_SAFE_FUNCTIONS:
 516 #ifdef  _POSIX_THREAD_SAFE_FUNCTIONS
 517       return _POSIX_THREAD_SAFE_FUNCTIONS;
 518 #else
 519       return -1;
 520 #endif
 521
 522     case _SC_GETGR_R_SIZE_MAX:
 523       return NSS_BUFLEN_GROUP;
 524
 525     case _SC_GETPW_R_SIZE_MAX:
 526       return NSS_BUFLEN_PASSWD;
 527
 528     case _SC_LOGIN_NAME_MAX:
 529 #ifdef  LOGIN_NAME_MAX
 530       return LOGIN_NAME_MAX;
 531 #else
 532       return -1;
 533 #endif
 534
 535     case _SC_TTY_NAME_MAX:
 536 #ifdef  TTY_NAME_MAX
 537       return TTY_NAME_MAX;
 538 #else
 539       return -1;
 540 #endif
 541
 542     case _SC_THREAD_DESTRUCTOR_ITERATIONS:
 543 #ifdef  _POSIX_THREAD_DESTRUCTOR_ITERATIONS
 544       return _POSIX_THREAD_DESTRUCTOR_ITERATIONS;
 545 #else
 546       return -1;
 547 #endif
 548
 549     case _SC_THREAD_KEYS_MAX:
 550 #ifdef  PTHREAD_KEYS_MAX
 551       return PTHREAD_KEYS_MAX;
 552 #else
 553       return -1;
 554 #endif
 555
 556     case _SC_THREAD_STACK_MIN:
 557 #ifdef  PTHREAD_STACK_MIN
 558       return PTHREAD_STACK_MIN;
 559 #else
 560       return -1;
 561 #endif
 562
 563     case _SC_THREAD_THREADS_MAX:
 564 #ifdef  PTHREAD_THREADS_MAX
 565       return PTHREAD_THREADS_MAX;
 566 #else
 567       return -1;
 568 #endif
 569
 570     case _SC_THREAD_ATTR_STACKADDR:
 571 #ifdef  _POSIX_THREAD_ATTR_STACKADDR
 572       return _POSIX_THREAD_ATTR_STACKADDR;
 573 #else
 574       return -1;
 575 #endif
 576
 577     case _SC_THREAD_ATTR_STACKSIZE:
 578 #ifdef  _POSIX_THREAD_ATTR_STACKSIZE
 579       return _POSIX_THREAD_ATTR_STACKSIZE;
 580 #else
 581       return -1;
 582 #endif
 583
 584     case _SC_THREAD_PRIORITY_SCHEDULING:
 585 #ifdef  _POSIX_THREAD_PRIORITY_SCHEDULING
 586       return _POSIX_THREAD_PRIORITY_SCHEDULING;
 587 #else
 588       return -1;
 589 #endif
 590
 591     case _SC_THREAD_PRIO_INHERIT:
 592 #ifdef  _POSIX_THREAD_PRIO_INHERIT
 593       return _POSIX_THREAD_PRIO_INHERIT;
 594 #else
 595       return -1;
 596 #endif
 597
 598     case _SC_THREAD_PRIO_PROTECT:
 599 #ifdef  _POSIX_THREAD_PRIO_PROTECT
 600       return _POSIX_THREAD_PRIO_PROTECT;
 601 #else
 602       return -1;
 603 #endif
 604
 605     case _SC_THREAD_PROCESS_SHARED:
 606 #ifdef  _POSIX_THREAD_PROCESS_SHARED
 607       return _POSIX_THREAD_PROCESS_SHARED;
 608 #else
 609       return -1;
 610 #endif
 611
 612     case _SC_NPROCESSORS_CONF:
 613       return __get_nprocs_conf ();
 614
 615     case _SC_NPROCESSORS_ONLN:
 616       return __get_nprocs ();
 617
 618     case _SC_PHYS_PAGES:
 619       return __get_phys_pages ();
 620
 621     case _SC_AVPHYS_PAGES:
 622       return __get_avphys_pages ();
 623
 624     case _SC_ATEXIT_MAX:
 625       /* We have no limit since we use lists.  */
 626       return INT_MAX;
 627
 628     case _SC_PASS_MAX:
 629       /* We have no limit but since the return value might be used to
 630          allocate a buffer we restrict the value.  */
 631       return BUFSIZ;
 632
 633     case _SC_XOPEN_VERSION:
 634       return _XOPEN_VERSION;
 635
 636     case _SC_XOPEN_XCU_VERSION:
 637       return _XOPEN_XCU_VERSION;
 638
 639     case _SC_XOPEN_UNIX:
 640       return _XOPEN_UNIX;
 641
 642     case _SC_XOPEN_CRYPT:
 643 #ifdef  _XOPEN_CRYPT
 644       return _XOPEN_CRYPT;
 645 #else
 646       return -1;
 647 #endif
 648
 649     case _SC_XOPEN_ENH_I18N:
 650 #ifdef  _XOPEN_ENH_I18N
 651       return _XOPEN_ENH_I18N;
 652 #else
 653       return -1;
 654 #endif
 655
 656     case _SC_XOPEN_SHM:
 657 #ifdef  _XOPEN_SHM
 658       return _XOPEN_SHM;
 659 #else
 660       return -1;
 661 #endif
 662
 663     case _SC_XOPEN_XPG2:
 664 #ifdef  _XOPEN_XPG2
 665       return _XOPEN_XPG2;
 666 #else
 667       return -1;
 668 #endif
 669
 670     case _SC_XOPEN_XPG3:
 671 #ifdef  _XOPEN_XPG3
 672       return _XOPEN_XPG3;
 673 #else
 674       return -1;
 675 #endif
 676
 677     case _SC_XOPEN_XPG4:
 678 #ifdef  _XOPEN_XPG4
 679       return _XOPEN_XPG4;
 680 #else
 681       return -1;
 682 #endif
 683
 684     case _SC_CHAR_BIT:
 685       return CHAR_BIT;
 686
 687     case _SC_CHAR_MAX:
 688       return CHAR_MAX;
 689
 690     case _SC_CHAR_MIN:
 691       return CHAR_MIN;
 692
 693     case _SC_INT_MAX:
 694       return INT_MAX;
 695
 696     case _SC_INT_MIN:
 697       return INT_MIN;
 698
 699     case _SC_LONG_BIT:
 700       return sizeof (long int) * CHAR_BIT;
 701
 702     case _SC_WORD_BIT:
 703       return sizeof (int) * CHAR_BIT;
 704
 705     case _SC_MB_LEN_MAX:
 706       return MB_LEN_MAX;
 707
 708     case _SC_NZERO:
 709       return NZERO;
 710
 711     case _SC_SSIZE_MAX:
 712       return _POSIX_SSIZE_MAX;
 713
 714     case _SC_SCHAR_MAX:
 715       return SCHAR_MAX;
 716
 717     case _SC_SCHAR_MIN:
 718       return SCHAR_MIN;
 719
 720     case _SC_SHRT_MAX:
 721       return SHRT_MAX;
 722
 723     case _SC_SHRT_MIN:
 724       return SHRT_MIN;
 725
 726     case _SC_UCHAR_MAX:
 727       return UCHAR_MAX;
 728
 729     case _SC_UINT_MAX:
 730       return UINT_MAX;
 731
 732     case _SC_ULONG_MAX:
 733       return ULONG_MAX;
 734
 735     case _SC_USHRT_MAX:
 736       return USHRT_MAX;
 737
 738     case _SC_NL_ARGMAX:
 739 #ifdef  NL_ARGMAX
 740       return NL_ARGMAX;
 741 #else
 742       return -1;
 743 #endif
 744
 745     case _SC_NL_LANGMAX:
 746 #ifdef  NL_LANGMAX
 747       return NL_LANGMAX;
 748 #else
 749       return -1;
 750 #endif
 751
 752     case _SC_NL_MSGMAX:
 753 #ifdef  NL_MSGMAX
 754       return NL_MSGMAX;
 755 #else
 756       return -1;
 757 #endif
 758
 759     case _SC_NL_NMAX:
 760 #ifdef  NL_NMAX
 761       return NL_NMAX;
 762 #else
 763       return -1;
 764 #endif
 765
 766     case _SC_NL_SETMAX:
 767 #ifdef  NL_SETMAX
 768       return NL_SETMAX;
 769 #else
 770       return -1;
 771 #endif
 772
 773     case _SC_NL_TEXTMAX:
 774 #ifdef  NL_TEXTMAX
 775       return NL_TEXTMAX;
 776 #else
 777       return -1;
 778 #endif
 779
 780     case _SC_XBS5_ILP32_OFF32:
 781 #ifdef _XBS5_ILP32_OFF32
 782       return _XBS5_ILP32_OFF32;
 783 #else
 784       return -1;
 785 #endif
 786     case _SC_XBS5_ILP32_OFFBIG:
 787 #ifdef _XBS5_ILP32_OFFBIG
 788       return _XBS5_ILP32_OFFBIG;
 789 #else
 790       return -1;
 791 #endif
 792     case _SC_XBS5_LP64_OFF64:
 793 #ifdef _XBS5_LP64_OFF64
 794       return _XBS5_LP64_OFF64;
 795 #else
 796       return -1;
 797 #endif
 798     case _SC_XBS5_LPBIG_OFFBIG:
 799 #ifdef _XBS5_LPBIG_OFFBIG
 800       return _XBS5_LPBIG_OFFBIG;
 801 #else
 802       return -1;
 803 #endif
 804
 805     case _SC_V6_ILP32_OFF32:
 806 #ifdef _POSIX_V6_ILP32_OFF32
 807       return _POSIX_V6_ILP32_OFF32;
 808 #else
 809       return -1;
 810 #endif
 811     case _SC_V6_ILP32_OFFBIG:
 812 #ifdef _POSIX_V6_ILP32_OFFBIG
 813       return _POSIX_V6_ILP32_OFFBIG;
 814 #else
 815       return -1;
 816 #endif
 817     case _SC_V6_LP64_OFF64:
 818 #ifdef _POSIX_V6_LP64_OFF64
 819       return _POSIX_V6_LP64_OFF64;
 820 #else
 821       return -1;
 822 #endif
 823     case _SC_V6_LPBIG_OFFBIG:
 824 #ifdef _POSIX_V6_LPBIG_OFFBIG
 825       return _POSIX_V6_LPBIG_OFFBIG;
 826 #else
 827       return -1;
 828 #endif
 829
 830     case _SC_XOPEN_LEGACY:
 831       return _XOPEN_LEGACY;
 832
 833     case _SC_XOPEN_REALTIME:
 834 #ifdef _XOPEN_REALTIME
 835       return _XOPEN_REALTIME;
 836 #else
 837       return -1;
 838 #endif
 839     case _SC_XOPEN_REALTIME_THREADS:
 840 #ifdef _XOPEN_REALTIME_THREADS
 841       return _XOPEN_REALTIME_THREADS;
 842 #else
 843       return -1;
 844 #endif
 845
 846     case _SC_ADVISORY_INFO:
 847 #ifdef _POSIX_ADVISORY_INFO
 848       return _POSIX_ADVISORY_INFO;
 849 #else
 850       return -1;
 851 #endif
 852
 853     case _SC_BARRIERS:
 854 #ifdef _POSIX_BARRIERS
 855       return _POSIX_BARRIERS;
 856 #else
 857       return -1;
 858 #endif
 859
 860     case _SC_BASE:
 861 #ifdef _POSIX_BASE
 862       return _POSIX_BASE;
 863 #else
 864       return -1;
 865 #endif
 866     case _SC_C_LANG_SUPPORT:
 867 #ifdef _POSIX_C_LANG_SUPPORT
 868       return _POSIX_C_LANG_SUPPORT;
 869 #else
 870       return -1;
 871 #endif
 872     case _SC_C_LANG_SUPPORT_R:
 873 #ifdef _POSIX_C_LANG_SUPPORT_R
 874       return _POSIX_C_LANG_SUPPORT_R;
 875 #else
 876       return -1;
 877 #endif
 878
 879     case _SC_CLOCK_SELECTION:
 880 #ifdef _POSIX_CLOCK_SELECTION
 881       return _POSIX_CLOCK_SELECTION;
 882 #else
 883       return -1;
 884 #endif
 885
 886     case _SC_CPUTIME:
 887 #ifdef _POSIX_CPUTIME
 888       return _POSIX_CPUTIME;
 889 #else
 890       return -1;
 891 #endif
 892
 893     case _SC_DEVICE_IO:
 894 #ifdef _POSIX_DEVICE_IO
 895       return _POSIX_DEVICE_IO;
 896 #else
 897       return -1;
 898 #endif
 899     case _SC_DEVICE_SPECIFIC:
 900 #ifdef _POSIX_DEVICE_SPCIFIC
 901       return _POSIX_DEVICE_SPECIFIC;
 902 #else
 903       return -1;
 904 #endif
 905     case _SC_DEVICE_SPECIFIC_R:
 906 #ifdef _POSIX_DEVICE_SPCIFIC_R
 907       return _POSIX_DEVICE_SPECIFIC_R;
 908 #else
 909       return -1;
 910 #endif
 911
 912     case _SC_FD_MGMT:
 913 #ifdef _POSIX_FD_MGMT
 914       return _POSIX_FD_MGMT;
 915 #else
 916       return -1;
 917 #endif
 918
 919     case _SC_FIFO:
 920 #ifdef _POSIX_FIFO
 921       return _POSIX_FIFO;
 922 #else
 923       return -1;
 924 #endif
 925     case _SC_PIPE:
 926 #ifdef _POSIX_PIPE
 927       return _POSIX_PIPE;
 928 #else
 929       return -1;
 930 #endif
 931
 932     case _SC_FILE_ATTRIBUTES:
 933 #ifdef _POSIX_FILE_ATTRIBUTES
 934       return _POSIX_FILE_ATTRIBUTES;
 935 #else
 936       return -1;
 937 #endif
 938     case _SC_FILE_LOCKING:
 939 #ifdef _POSIX_FILE_LOCKING
 940       return _POSIX_FILE_LOCKING;
 941 #else
 942       return -1;
 943 #endif
 944     case _SC_FILE_SYSTEM:
 945 #ifdef _POSIX_FILE_SYSTEM
 946       return _POSIX_FILE_SYSTEM;
 947 #else
 948       return -1;
 949 #endif
 950
 951     case _SC_MONOTONIC_CLOCK:
 952 #if _POSIX_MONOTONIC_CLOCK
 953       return _POSIX_MONOTONIC_CLOCK;
 954 #else
 955       return -1;
 956 #endif
 957
 958     case _SC_MULTI_PROCESS:
 959 #ifdef _POSIX_MULTI_PROCESS
 960       return _POSIX_MULTI_PROCESS;
 961 #else
 962       return -1;
 963 #endif
 964     case _SC_SINGLE_PROCESS:
 965 #ifdef _POSIX_SINGLE_PROCESS
 966       return _POSIX_SINGLE_PROCESS;
 967 #else
 968       return -1;
 969 #endif
 970
 971     case _SC_NETWORKING:
 972 #ifdef _POSIX_NETWORKING
 973       return _POSIX_NETWORKING;
 974 #else
 975       return -1;
 976 #endif
 977
 978     case _SC_READER_WRITER_LOCKS:
 979 #ifdef _POSIX_READER_WRITER_LOCKS
 980       return _POSIX_READER_WRITER_LOCKS;
 981 #else
 982       return -1;
 983 #endif
 984     case _SC_SPIN_LOCKS:
 985 #ifdef _POSIX_SPIN_LOCKS
 986       return _POSIX_SPIN_LOCKS;
 987 #else
 988       return -1;
 989 #endif
 990
 991     case _SC_REGEXP:
 992 #ifdef _POSIX_REGEXP
 993       return _POSIX_REGEXP;
 994 #else
 995       return -1;
 996 #endif
 997     case _SC_REGEX_VERSION:
 998 #ifdef _POSIX_REGEX_VERSION
 999       return _POSIX_REGEX_VERSION;
1000 #else
1001       return -1;
1002 #endif
1003
1004     case _SC_SHELL:
1005 #ifdef _POSIX_SHELL
1006       return _POSIX_SHELL;
1007 #else
1008       return -1;
1009 #endif
1010
1011     case _SC_SIGNALS:
1012 #ifdef _POSUX_SIGNALS
1013       return _POSIX_SIGNALS;
1014 #else
1015       return -1;
1016 #endif
1017
1018     case _SC_SPAWN:
1019 #ifdef _POSIX_SPAWN
1020       return _POSIX_SPAWN;
1021 #else
1022       return -1;
1023 #endif
1024
1025     case _SC_SPORADIC_SERVER:
1026 #ifdef _POSIX_SPORADIC_SERVER
1027       return _POSIX_SPORADIC_SERVER;
1028 #else
1029       return -1;
1030 #endif
1031     case _SC_THREAD_SPORADIC_SERVER:
1032 #ifdef _POSIX_THREAD_SPORADIC_SERVER
1033       return _POSIX_THREAD_SPORADIC_SERVER;
1034 #else
1035       return -1;
1036 #endif
1037
1038     case _SC_SYSTEM_DATABASE:
1039 #ifdef _POSIX_SYSTEM_DATABASE
1040       return _POSIX_SYSTEM_DATABASE;
1041 #else
1042       return -1;
1043 #endif
1044     case _SC_SYSTEM_DATABASE_R:
1045 #ifdef _POSIX_SYSTEM_DATABASE_R
1046       return _POSIX_SYSTEM_DATABASE_R;
1047 #else
1048       return -1;
1049 #endif
1050
1051     case _SC_THREAD_CPUTIME:
1052 #ifdef _POSIX_THREAD_CPUTIME
1053       return _POSIX_THREAD_CPUTIME;
1054 #else
1055       return -1;
1056 #endif
1057
1058     case _SC_TIMEOUTS:
1059 #ifdef _POSIX_TIMEOUTS
1060       return _POSIX_TIMEOUTS;
1061 #else
1062       return -1;
1063 #endif
1064
1065     case _SC_TYPED_MEMORY_OBJECTS:
1066 #ifdef _POSIX_TYPED_MEMORY_OBJECTS
1067       return _POSIX_TYPED_MEMORY_OBJECTS;
1068 #else
1069       return -1;
1070 #endif
1071
1072     case _SC_USER_GROUPS:
1073 #ifdef _POSIX_USER_GROUPS
1074       return _POSIX_USER_GROUPS;
1075 #else
1076       return -1;
1077 #endif
1078     case _SC_USER_GROUPS_R:
1079 #ifdef _POSIX_USER_GROUPS_R
1080       return _POSIX_USER_GROUPS_R;
1081 #else
1082       return -1;
1083 #endif
1084
1085     case _SC_2_PBS:
1086 #ifdef _POSIX2_PBS
1087       return _POSIX2_PBS;
1088 #else
1089       return -1;
1090 #endif
1091     case _SC_2_PBS_ACCOUNTING:
1092 #ifdef _POSIX2_PBS_ACCOUNTING
1093       return _POSIX2_PBS_ACCOUNTING;
1094 #else
1095       return -1;
1096 #endif
1097     case _SC_2_PBS_CHECKPOINT:
1098 #ifdef _POSIX2_PBS_CHECKPOINT
1099       return _POSIX2_PBS_CHECKPOINT;
1100 #else
1101       return -1;
1102 #endif
1103     case _SC_2_PBS_LOCATE:
1104 #ifdef _POSIX2_PBS_LOCATE
1105       return _POSIX2_PBS_LOCATE;
1106 #else
1107       return -1;
1108 #endif
1109     case _SC_2_PBS_MESSAGE:
1110 #ifdef _POSIX2_PBS_MESSAGE
1111       return _POSIX2_PBS_MESSAGE;
1112 #else
1113       return -1;
1114 #endif
1115     case _SC_2_PBS_TRACK:
1116 #ifdef _POSIX2_PBS_TRACK
1117       return _POSIX2_PBS_TRACK;
1118 #else
1119       return -1;
1120 #endif
1121
1122     case _SC_SYMLOOP_MAX:
1123 #ifdef SYMLOOP_MAX
1124       return SYMLOOP_MAX;
1125 #else
1126       return -1;
1127 #endif
1128
1129     case _SC_STREAMS:
1130 #ifdef _XOPEN_STREAMS
1131       return _XOPEN_STREAMS;
1132 #else
1133       return -1;
1134 #endif
1135
1136     case _SC_HOST_NAME_MAX:
1137 #ifdef HOST_NAME_MAX
1138       return HOST_NAME_MAX;
1139 #else
1140       return -1;
1141 #endif
1142
1143     case _SC_TRACE:
1144 #ifdef _POSIX_TRACE
1145       return _POSIX_TRACE;
1146 #else
1147       return -1;
1148 #endif
1149     case _SC_TRACE_EVENT_FILTER:
1150 #ifdef _POSIX_TRACE_EVENT_FILTER
1151       return _POSIX_TRACE_EVENT_FILTER;
1152 #else
1153       return -1;
1154 #endif
1155     case _SC_TRACE_INHERIT:
1156 #ifdef _POSIX_TRACE_INHERIT
1157       return _POSIX_TRACE_INHERIT;
1158 #else
1159       return -1;
1160 #endif
1161     case _SC_TRACE_LOG:
1162 #ifdef _POSIX_TRACE_LOG
1163       return _POSIX_TRACE_LOG;
1164 #else
1165       return -1;
1166 #endif
1167
1168     case _SC_LEVEL1_ICACHE_SIZE:
1169     case _SC_LEVEL1_ICACHE_ASSOC:
1170     case _SC_LEVEL1_ICACHE_LINESIZE:
1171     case _SC_LEVEL1_DCACHE_SIZE:
1172     case _SC_LEVEL1_DCACHE_ASSOC:
1173     case _SC_LEVEL1_DCACHE_LINESIZE:
1174     case _SC_LEVEL2_CACHE_SIZE:
1175     case _SC_LEVEL2_CACHE_ASSOC:
1176     case _SC_LEVEL2_CACHE_LINESIZE:
1177     case _SC_LEVEL3_CACHE_SIZE:
1178     case _SC_LEVEL3_CACHE_ASSOC:
1179     case _SC_LEVEL3_CACHE_LINESIZE:
1180     case _SC_LEVEL4_CACHE_SIZE:
1181     case _SC_LEVEL4_CACHE_ASSOC:
1182       /* In general we cannot determine these values.  Therefore we
1183          return zero which indicates that no information is
1184          available.  */
1185       return 0;
1186     }
1187 }
1188
1189 #undef __sysconf
1190 weak_alias (__sysconf, sysconf)
1191 libc_hidden_def (__sysconf)