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 <stdlib.h>
  27 #include <string.h>
  28 #include <time.h>
  29 #include <unistd.h>
  30 #include <sys/param.h>
  31 #include <sys/stat.h>
  32 #include <sys/sysinfo.h>
  33 #include <sys/types.h>
  34 #include <regex.h>
  35
  36
  37 static long int __sysconf_check_spec (const char *spec);
  38
  39
  40 /* Get the value of the system variable NAME.  */
  41 long int
  42 __sysconf (name)
  43      int name;
  44 {
  45   switch (name)
  46     {
  47       /* Also add obsolete or unnecessarily added constants here.  */
  48     case _SC_EQUIV_CLASS_MAX:
  49     default:
  50       __set_errno (EINVAL);
  51       return -1;
  52
  53     case _SC_ARG_MAX:
  54 #ifdef  ARG_MAX
  55       return ARG_MAX;
  56 #else
  57       return -1;
  58 #endif
  59
  60     case _SC_CHILD_MAX:
  61 #ifdef  CHILD_MAX
  62       return CHILD_MAX;
  63 #else
  64       return -1;
  65 #endif
  66
  67     case _SC_CLK_TCK:
  68       return __getclktck ();
  69
  70     case _SC_NGROUPS_MAX:
  71 #ifdef  NGROUPS_MAX
  72       return NGROUPS_MAX;
  73 #else
  74       return -1;
  75 #endif
  76
  77     case _SC_OPEN_MAX:
  78       return __getdtablesize ();
  79
  80     case _SC_STREAM_MAX:
  81 #ifdef  STREAM_MAX
  82       return STREAM_MAX;
  83 #else
  84       return FOPEN_MAX;
  85 #endif
  86
  87     case _SC_TZNAME_MAX:
  88       return MAX (__tzname_max (), _POSIX_TZNAME_MAX);
  89
  90     case _SC_JOB_CONTROL:
  91 #ifdef  _POSIX_JOB_CONTROL
  92       return 1;
  93 #else
  94       return -1;
  95 #endif
  96
  97     case _SC_SAVED_IDS:
  98 #ifdef  _POSIX_SAVED_IDS
  99       return 1;
 100 #else
 101       return -1;
 102 #endif
 103
 104     case _SC_REALTIME_SIGNALS:
 105 #ifdef  _POSIX_REALTIME_SIGNALS
 106       return _POSIX_REALTIME_SIGNALS;
 107 #else
 108       return -1;
 109 #endif
 110
 111     case _SC_PRIORITY_SCHEDULING:
 112 #ifdef  _POSIX_PRIORITY_SCHEDULING
 113       return _POSIX_PRIORITY_SCHEDULING;
 114 #else
 115       return -1;
 116 #endif
 117
 118     case _SC_TIMERS:
 119 #ifdef  _POSIX_TIMERS
 120       return _POSIX_TIMERS;
 121 #else
 122       return -1;
 123 #endif
 124
 125     case _SC_ASYNCHRONOUS_IO:
 126 #ifdef  _POSIX_ASYNCHRONOUS_IO
 127       return _POSIX_ASYNCHRONOUS_IO;
 128 #else
 129       return -1;
 130 #endif
 131
 132     case _SC_PRIORITIZED_IO:
 133 #ifdef  _POSIX_PRIORITIZED_IO
 134       return _POSIX_PRIORITIZED_IO;
 135 #else
 136       return -1;
 137 #endif
 138
 139     case _SC_SYNCHRONIZED_IO:
 140 #ifdef  _POSIX_SYNCHRONIZED_IO
 141       return _POSIX_SYNCHRONIZED_IO;
 142 #else
 143       return -1;
 144 #endif
 145
 146     case _SC_FSYNC:
 147 #ifdef  _POSIX_FSYNC
 148       return _POSIX_FSYNC;
 149 #else
 150       return -1;
 151 #endif
 152
 153     case _SC_MAPPED_FILES:
 154 #ifdef  _POSIX_MAPPED_FILES
 155       return _POSIX_MAPPED_FILES;
 156 #else
 157       return -1;
 158 #endif
 159
 160     case _SC_MEMLOCK:
 161 #ifdef  _POSIX_MEMLOCK
 162       return _POSIX_MEMLOCK;
 163 #else
 164       return -1;
 165 #endif
 166
 167     case _SC_MEMLOCK_RANGE:
 168 #ifdef  _POSIX_MEMLOCK_RANGE
 169       return _POSIX_MEMLOCK_RANGE;
 170 #else
 171       return -1;
 172 #endif
 173
 174     case _SC_MEMORY_PROTECTION:
 175 #ifdef  _POSIX_MEMORY_PROTECTION
 176       return _POSIX_MEMORY_PROTECTION;
 177 #else
 178       return -1;
 179 #endif
 180
 181     case _SC_MESSAGE_PASSING:
 182 #ifdef  _POSIX_MESSAGE_PASSING
 183       return _POSIX_MESSAGE_PASSING;
 184 #else
 185       return -1;
 186 #endif
 187
 188     case _SC_SEMAPHORES:
 189 #ifdef  _POSIX_SEMAPHORES
 190       return _POSIX_SEMAPHORES;
 191 #else
 192       return -1;
 193 #endif
 194
 195     case _SC_SHARED_MEMORY_OBJECTS:
 196 #ifdef  _POSIX_SHARED_MEMORY_OBJECTS
 197       return _POSIX_SHARED_MEMORY_OBJECTS;
 198 #else
 199       return -1;
 200 #endif
 201
 202     case _SC_VERSION:
 203       return _POSIX_VERSION;
 204
 205     case _SC_PAGESIZE:
 206       return __getpagesize ();
 207
 208     case _SC_AIO_LISTIO_MAX:
 209 #ifdef  AIO_LISTIO_MAX
 210       return AIO_LISTIO_MAX;
 211 #else
 212       return -1;
 213 #endif
 214
 215     case _SC_AIO_MAX:
 216 #ifdef  AIO_MAX
 217       return AIO_MAX;
 218 #else
 219       return -1;
 220 #endif
 221
 222     case _SC_AIO_PRIO_DELTA_MAX:
 223 #ifdef  AIO_PRIO_DELTA_MAX
 224       return AIO_PRIO_DELTA_MAX;
 225 #else
 226       return -1;
 227 #endif
 228
 229     case _SC_DELAYTIMER_MAX:
 230 #ifdef  DELAYTIMER_MAX
 231       return DELAYTIMER_MAX;
 232 #else
 233       return -1;
 234 #endif
 235
 236     case _SC_MQ_OPEN_MAX:
 237 #ifdef  MQ_OPEN_MAX
 238       return MQ_OPEN_MAX;
 239 #else
 240       return -1;
 241 #endif
 242
 243     case _SC_MQ_PRIO_MAX:
 244 #ifdef  MQ_PRIO_MAX
 245       return MQ_PRIO_MAX;
 246 #else
 247       return -1;
 248 #endif
 249
 250     case _SC_RTSIG_MAX:
 251 #ifdef  RTSIG_MAX
 252       return RTSIG_MAX;
 253 #else
 254       return -1;
 255 #endif
 256
 257     case _SC_SEM_NSEMS_MAX:
 258 #ifdef  SEM_NSEMS_MAX
 259       return SEM_NSEMS_MAX;
 260 #else
 261       return -1;
 262 #endif
 263
 264     case _SC_SEM_VALUE_MAX:
 265 #ifdef  SEM_VALUE_MAX
 266       return SEM_VALUE_MAX;
 267 #else
 268       return -1;
 269 #endif
 270
 271     case _SC_SIGQUEUE_MAX:
 272 #ifdef  SIGQUEUE_MAX
 273       return SIGQUEUE_MAX;
 274 #else
 275       return -1;
 276 #endif
 277
 278     case _SC_TIMER_MAX:
 279 #ifdef  TIMER_MAX
 280       return TIMER_MAX;
 281 #else
 282       return -1;
 283 #endif
 284
 285     case _SC_BC_BASE_MAX:
 286 #ifdef  BC_BASE_MAX
 287       return BC_BASE_MAX;
 288 #else
 289       return -1;
 290 #endif
 291
 292     case _SC_BC_DIM_MAX:
 293 #ifdef  BC_DIM_MAX
 294       return BC_DIM_MAX;
 295 #else
 296       return -1;
 297 #endif
 298
 299     case _SC_BC_SCALE_MAX:
 300 #ifdef  BC_SCALE_MAX
 301       return BC_SCALE_MAX;
 302 #else
 303       return -1;
 304 #endif
 305
 306     case _SC_BC_STRING_MAX:
 307 #ifdef  BC_STRING_MAX
 308       return BC_STRING_MAX;
 309 #else
 310       return -1;
 311 #endif
 312
 313     case _SC_COLL_WEIGHTS_MAX:
 314 #ifdef  COLL_WEIGHTS_MAX
 315       return COLL_WEIGHTS_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       /* The same as _SC_IOV_MAX.  */
 398     case _SC_UIO_MAXIOV:
 399 #ifdef  UIO_MAXIOV
 400       return UIO_MAXIOV;
 401 #else
 402       return -1;
 403 #endif
 404
 405     case _SC_PII_INTERNET_STREAM:
 406 #ifdef  _POSIX_PII_INTERNET_STREAM
 407       return 1;
 408 #else
 409       return -1;
 410 #endif
 411
 412     case _SC_PII_INTERNET_DGRAM:
 413 #ifdef  _POSIX_PII_INTERNET_DGRAM
 414       return 1;
 415 #else
 416       return -1;
 417 #endif
 418
 419     case _SC_PII_OSI_COTS:
 420 #ifdef  _POSIX_PII_OSI_COTS
 421       return 1;
 422 #else
 423       return -1;
 424 #endif
 425
 426     case _SC_PII_OSI_CLTS:
 427 #ifdef  _POSIX_PII_OSI_CLTS
 428       return 1;
 429 #else
 430       return -1;
 431 #endif
 432
 433     case _SC_PII_OSI_M:
 434 #ifdef  _POSIX_PII_OSI_M
 435       return 1;
 436 #else
 437       return -1;
 438 #endif
 439
 440     case _SC_T_IOV_MAX:
 441 #ifdef  _T_IOV_MAX
 442       return _T_IOV_MAX;
 443 #else
 444       return -1;
 445 #endif
 446
 447     case _SC_2_VERSION:
 448       return _POSIX2_VERSION;
 449
 450     case _SC_2_C_BIND:
 451 #ifdef  _POSIX2_C_BIND
 452       return _POSIX2_C_BIND;
 453 #else
 454       return -1;
 455 #endif
 456
 457     case _SC_2_C_DEV:
 458 #ifdef  _POSIX2_C_DEV
 459       return _POSIX2_C_DEV;
 460 #else
 461       return -1;
 462 #endif
 463
 464     case _SC_2_C_VERSION:
 465 #ifdef  _POSIX2_C_VERSION
 466       return _POSIX2_C_VERSION;
 467 #else
 468       return -1;
 469 #endif
 470
 471     case _SC_2_FORT_DEV:
 472 #ifdef  _POSIX2_FORT_DEV
 473       return _POSIX2_FORT_DEV;
 474 #else
 475       return -1;
 476 #endif
 477
 478     case _SC_2_FORT_RUN:
 479 #ifdef  _POSIX2_FORT_RUN
 480       return _POSIX2_FORT_RUN;
 481 #else
 482       return -1;
 483 #endif
 484
 485     case _SC_2_LOCALEDEF:
 486 #ifdef  _POSIX2_LOCALEDEF
 487       return _POSIX2_LOCALEDEF;
 488 #else
 489       return -1;
 490 #endif
 491
 492     case _SC_2_SW_DEV:
 493 #ifdef  _POSIX2_SW_DEV
 494       return _POSIX2_SW_DEV;
 495 #else
 496       return -1;
 497 #endif
 498
 499     case _SC_2_CHAR_TERM:
 500 #ifdef  _POSIX2_CHAR_TERM
 501       return _POSIX2_CHAR_TERM;
 502 #else
 503       return -1;
 504 #endif
 505
 506     case _SC_2_UPE:
 507 #ifdef  _POSIX2_UPE
 508       return _POSIX2_UPE;
 509 #else
 510       return -1;
 511 #endif
 512
 513       /* POSIX 1003.1c (POSIX Threads).  */
 514     case _SC_THREADS:
 515 #ifdef  _POSIX_THREADS
 516       return _POSIX_THREADS;
 517 #else
 518       return -1;
 519 #endif
 520
 521     case _SC_THREAD_SAFE_FUNCTIONS:
 522 #ifdef  _POSIX_THREAD_SAFE_FUNCTIONS
 523       return _POSIX_THREAD_SAFE_FUNCTIONS;
 524 #else
 525       return -1;
 526 #endif
 527
 528     case _SC_GETGR_R_SIZE_MAX:
 529       return NSS_BUFLEN_GROUP;
 530
 531     case _SC_GETPW_R_SIZE_MAX:
 532       return NSS_BUFLEN_PASSWD;
 533
 534     case _SC_LOGIN_NAME_MAX:
 535 #ifdef  LOGIN_NAME_MAX
 536       return LOGIN_NAME_MAX;
 537 #else
 538       return -1;
 539 #endif
 540
 541     case _SC_TTY_NAME_MAX:
 542 #ifdef  TTY_NAME_MAX
 543       return TTY_NAME_MAX;
 544 #else
 545       return -1;
 546 #endif
 547
 548     case _SC_THREAD_DESTRUCTOR_ITERATIONS:
 549 #ifdef  _POSIX_THREAD_DESTRUCTOR_ITERATIONS
 550       return _POSIX_THREAD_DESTRUCTOR_ITERATIONS;
 551 #else
 552       return -1;
 553 #endif
 554
 555     case _SC_THREAD_KEYS_MAX:
 556 #ifdef  PTHREAD_KEYS_MAX
 557       return PTHREAD_KEYS_MAX;
 558 #else
 559       return -1;
 560 #endif
 561
 562     case _SC_THREAD_STACK_MIN:
 563 #ifdef  PTHREAD_STACK_MIN
 564       return PTHREAD_STACK_MIN;
 565 #else
 566       return -1;
 567 #endif
 568
 569     case _SC_THREAD_THREADS_MAX:
 570 #ifdef  PTHREAD_THREADS_MAX
 571       return PTHREAD_THREADS_MAX;
 572 #else
 573       return -1;
 574 #endif
 575
 576     case _SC_THREAD_ATTR_STACKADDR:
 577 #ifdef  _POSIX_THREAD_ATTR_STACKADDR
 578       return _POSIX_THREAD_ATTR_STACKADDR;
 579 #else
 580       return -1;
 581 #endif
 582
 583     case _SC_THREAD_ATTR_STACKSIZE:
 584 #ifdef  _POSIX_THREAD_ATTR_STACKSIZE
 585       return _POSIX_THREAD_ATTR_STACKSIZE;
 586 #else
 587       return -1;
 588 #endif
 589
 590     case _SC_THREAD_PRIORITY_SCHEDULING:
 591 #ifdef  _POSIX_THREAD_PRIORITY_SCHEDULING
 592       return _POSIX_THREAD_PRIORITY_SCHEDULING;
 593 #else
 594       return -1;
 595 #endif
 596
 597     case _SC_THREAD_PRIO_INHERIT:
 598 #ifdef  _POSIX_THREAD_PRIO_INHERIT
 599       return _POSIX_THREAD_PRIO_INHERIT;
 600 #else
 601       return -1;
 602 #endif
 603
 604     case _SC_THREAD_PRIO_PROTECT:
 605 #ifdef  _POSIX_THREAD_PRIO_PROTECT
 606       return _POSIX_THREAD_PRIO_PROTECT;
 607 #else
 608       return -1;
 609 #endif
 610
 611     case _SC_THREAD_PROCESS_SHARED:
 612 #ifdef  _POSIX_THREAD_PROCESS_SHARED
 613       return _POSIX_THREAD_PROCESS_SHARED;
 614 #else
 615       return -1;
 616 #endif
 617
 618     case _SC_NPROCESSORS_CONF:
 619       return __get_nprocs_conf ();
 620
 621     case _SC_NPROCESSORS_ONLN:
 622       return __get_nprocs ();
 623
 624     case _SC_PHYS_PAGES:
 625       return __get_phys_pages ();
 626
 627     case _SC_AVPHYS_PAGES:
 628       return __get_avphys_pages ();
 629
 630     case _SC_ATEXIT_MAX:
 631       /* We have no limit since we use lists.  */
 632       return INT_MAX;
 633
 634     case _SC_PASS_MAX:
 635       /* We have no limit but since the return value might be used to
 636          allocate a buffer we restrict the value.  */
 637       return BUFSIZ;
 638
 639     case _SC_XOPEN_VERSION:
 640       return _XOPEN_VERSION;
 641
 642     case _SC_XOPEN_XCU_VERSION:
 643       return _XOPEN_XCU_VERSION;
 644
 645     case _SC_XOPEN_UNIX:
 646       return _XOPEN_UNIX;
 647
 648     case _SC_XOPEN_CRYPT:
 649 #ifdef  _XOPEN_CRYPT
 650       return _XOPEN_CRYPT;
 651 #else
 652       return -1;
 653 #endif
 654
 655     case _SC_XOPEN_ENH_I18N:
 656 #ifdef  _XOPEN_ENH_I18N
 657       return _XOPEN_ENH_I18N;
 658 #else
 659       return -1;
 660 #endif
 661
 662     case _SC_XOPEN_SHM:
 663 #ifdef  _XOPEN_SHM
 664       return _XOPEN_SHM;
 665 #else
 666       return -1;
 667 #endif
 668
 669     case _SC_XOPEN_XPG2:
 670 #ifdef  _XOPEN_XPG2
 671       return _XOPEN_XPG2;
 672 #else
 673       return -1;
 674 #endif
 675
 676     case _SC_XOPEN_XPG3:
 677 #ifdef  _XOPEN_XPG3
 678       return _XOPEN_XPG3;
 679 #else
 680       return -1;
 681 #endif
 682
 683     case _SC_XOPEN_XPG4:
 684 #ifdef  _XOPEN_XPG4
 685       return _XOPEN_XPG4;
 686 #else
 687       return -1;
 688 #endif
 689
 690     case _SC_CHAR_BIT:
 691       return CHAR_BIT;
 692
 693     case _SC_CHAR_MAX:
 694       return CHAR_MAX;
 695
 696     case _SC_CHAR_MIN:
 697       return CHAR_MIN;
 698
 699     case _SC_INT_MAX:
 700       return INT_MAX;
 701
 702     case _SC_INT_MIN:
 703       return INT_MIN;
 704
 705     case _SC_LONG_BIT:
 706       return sizeof (long int) * CHAR_BIT;
 707
 708     case _SC_WORD_BIT:
 709       return sizeof (int) * CHAR_BIT;
 710
 711     case _SC_MB_LEN_MAX:
 712       return MB_LEN_MAX;
 713
 714     case _SC_NZERO:
 715       return NZERO;
 716
 717     case _SC_SSIZE_MAX:
 718       return _POSIX_SSIZE_MAX;
 719
 720     case _SC_SCHAR_MAX:
 721       return SCHAR_MAX;
 722
 723     case _SC_SCHAR_MIN:
 724       return SCHAR_MIN;
 725
 726     case _SC_SHRT_MAX:
 727       return SHRT_MAX;
 728
 729     case _SC_SHRT_MIN:
 730       return SHRT_MIN;
 731
 732     case _SC_UCHAR_MAX:
 733       return UCHAR_MAX;
 734
 735     case _SC_UINT_MAX:
 736       return UINT_MAX;
 737
 738     case _SC_ULONG_MAX:
 739       return ULONG_MAX;
 740
 741     case _SC_USHRT_MAX:
 742       return USHRT_MAX;
 743
 744     case _SC_NL_ARGMAX:
 745 #ifdef  NL_ARGMAX
 746       return NL_ARGMAX;
 747 #else
 748       return -1;
 749 #endif
 750
 751     case _SC_NL_LANGMAX:
 752 #ifdef  NL_LANGMAX
 753       return NL_LANGMAX;
 754 #else
 755       return -1;
 756 #endif
 757
 758     case _SC_NL_MSGMAX:
 759 #ifdef  NL_MSGMAX
 760       return NL_MSGMAX;
 761 #else
 762       return -1;
 763 #endif
 764
 765     case _SC_NL_NMAX:
 766 #ifdef  NL_NMAX
 767       return NL_NMAX;
 768 #else
 769       return -1;
 770 #endif
 771
 772     case _SC_NL_SETMAX:
 773 #ifdef  NL_SETMAX
 774       return NL_SETMAX;
 775 #else
 776       return -1;
 777 #endif
 778
 779     case _SC_NL_TEXTMAX:
 780 #ifdef  NL_TEXTMAX
 781       return NL_TEXTMAX;
 782 #else
 783       return -1;
 784 #endif
 785
 786     case _SC_XBS5_ILP32_OFF32:
 787 #ifdef _XBS5_ILP32_OFF32
 788       return _XBS5_ILP32_OFF32;
 789 #else
 790       return __sysconf_check_spec ("ILP32_OFF32");
 791 #endif
 792     case _SC_XBS5_ILP32_OFFBIG:
 793 #ifdef _XBS5_ILP32_OFFBIG
 794       return _XBS5_ILP32_OFFBIG;
 795 #else
 796       return __sysconf_check_spec ("ILP32_OFFBIG");
 797 #endif
 798     case _SC_XBS5_LP64_OFF64:
 799 #ifdef _XBS5_LP64_OFF64
 800       return _XBS5_LP64_OFF64;
 801 #else
 802       return __sysconf_check_spec ("LP64_OFF64");
 803 #endif
 804     case _SC_XBS5_LPBIG_OFFBIG:
 805 #ifdef _XBS5_LPBIG_OFFBIG
 806       return _XBS5_LPBIG_OFFBIG;
 807 #else
 808       return __sysconf_check_spec ("LPBIG_OFFBIG");
 809 #endif
 810
 811     case _SC_V6_ILP32_OFF32:
 812 #ifdef _POSIX_V6_ILP32_OFF32
 813       return _POSIX_V6_ILP32_OFF32;
 814 #else
 815       return __sysconf_check_spec ("ILP32_OFF32");
 816 #endif
 817     case _SC_V6_ILP32_OFFBIG:
 818 #ifdef _POSIX_V6_ILP32_OFFBIG
 819       return _POSIX_V6_ILP32_OFFBIG;
 820 #else
 821       return __sysconf_check_spec ("ILP32_OFFBIG");
 822 #endif
 823     case _SC_V6_LP64_OFF64:
 824 #ifdef _POSIX_V6_LP64_OFF64
 825       return _POSIX_V6_LP64_OFF64;
 826 #else
 827       return __sysconf_check_spec ("LP64_OFF64");
 828 #endif
 829     case _SC_V6_LPBIG_OFFBIG:
 830 #ifdef _POSIX_V6_LPBIG_OFFBIG
 831       return _POSIX_V6_LPBIG_OFFBIG;
 832 #else
 833       return __sysconf_check_spec ("LPBIG_OFFBIG");
 834 #endif
 835
 836     case _SC_XOPEN_LEGACY:
 837       return _XOPEN_LEGACY;
 838
 839     case _SC_XOPEN_REALTIME:
 840 #ifdef _XOPEN_REALTIME
 841       return _XOPEN_REALTIME;
 842 #else
 843       return -1;
 844 #endif
 845     case _SC_XOPEN_REALTIME_THREADS:
 846 #ifdef _XOPEN_REALTIME_THREADS
 847       return _XOPEN_REALTIME_THREADS;
 848 #else
 849       return -1;
 850 #endif
 851
 852     case _SC_ADVISORY_INFO:
 853 #ifdef _POSIX_ADVISORY_INFO
 854       return _POSIX_ADVISORY_INFO;
 855 #else
 856       return -1;
 857 #endif
 858
 859     case _SC_BARRIERS:
 860 #ifdef _POSIX_BARRIERS
 861       return _POSIX_BARRIERS;
 862 #else
 863       return -1;
 864 #endif
 865
 866     case _SC_BASE:
 867 #ifdef _POSIX_BASE
 868       return _POSIX_BASE;
 869 #else
 870       return -1;
 871 #endif
 872     case _SC_C_LANG_SUPPORT:
 873 #ifdef _POSIX_C_LANG_SUPPORT
 874       return _POSIX_C_LANG_SUPPORT;
 875 #else
 876       return -1;
 877 #endif
 878     case _SC_C_LANG_SUPPORT_R:
 879 #ifdef _POSIX_C_LANG_SUPPORT_R
 880       return _POSIX_C_LANG_SUPPORT_R;
 881 #else
 882       return -1;
 883 #endif
 884
 885     case _SC_CLOCK_SELECTION:
 886 #ifdef _POSIX_CLOCK_SELECTION
 887       return _POSIX_CLOCK_SELECTION;
 888 #else
 889       return -1;
 890 #endif
 891
 892     case _SC_CPUTIME:
 893 #ifdef _POSIX_CPUTIME
 894       return _POSIX_CPUTIME;
 895 #else
 896       return -1;
 897 #endif
 898
 899     case _SC_DEVICE_IO:
 900 #ifdef _POSIX_DEVICE_IO
 901       return _POSIX_DEVICE_IO;
 902 #else
 903       return -1;
 904 #endif
 905     case _SC_DEVICE_SPECIFIC:
 906 #ifdef _POSIX_DEVICE_SPCIFIC
 907       return _POSIX_DEVICE_SPECIFIC;
 908 #else
 909       return -1;
 910 #endif
 911     case _SC_DEVICE_SPECIFIC_R:
 912 #ifdef _POSIX_DEVICE_SPCIFIC_R
 913       return _POSIX_DEVICE_SPECIFIC_R;
 914 #else
 915       return -1;
 916 #endif
 917
 918     case _SC_FD_MGMT:
 919 #ifdef _POSIX_FD_MGMT
 920       return _POSIX_FD_MGMT;
 921 #else
 922       return -1;
 923 #endif
 924
 925     case _SC_FIFO:
 926 #ifdef _POSIX_FIFO
 927       return _POSIX_FIFO;
 928 #else
 929       return -1;
 930 #endif
 931     case _SC_PIPE:
 932 #ifdef _POSIX_PIPE
 933       return _POSIX_PIPE;
 934 #else
 935       return -1;
 936 #endif
 937
 938     case _SC_FILE_ATTRIBUTES:
 939 #ifdef _POSIX_FILE_ATTRIBUTES
 940       return _POSIX_FILE_ATTRIBUTES;
 941 #else
 942       return -1;
 943 #endif
 944     case _SC_FILE_LOCKING:
 945 #ifdef _POSIX_FILE_LOCKING
 946       return _POSIX_FILE_LOCKING;
 947 #else
 948       return -1;
 949 #endif
 950     case _SC_FILE_SYSTEM:
 951 #ifdef _POSIX_FILE_SYSTEM
 952       return _POSIX_FILE_SYSTEM;
 953 #else
 954       return -1;
 955 #endif
 956
 957     case _SC_MONOTONIC_CLOCK:
 958 #if _POSIX_MONOTONIC_CLOCK
 959       return _POSIX_MONOTONIC_CLOCK;
 960 #else
 961       return -1;
 962 #endif
 963
 964     case _SC_MULTI_PROCESS:
 965 #ifdef _POSIX_MULTI_PROCESS
 966       return _POSIX_MULTI_PROCESS;
 967 #else
 968       return -1;
 969 #endif
 970     case _SC_SINGLE_PROCESS:
 971 #ifdef _POSIX_SINGLE_PROCESS
 972       return _POSIX_SINGLE_PROCESS;
 973 #else
 974       return -1;
 975 #endif
 976
 977     case _SC_NETWORKING:
 978 #ifdef _POSIX_NETWORKING
 979       return _POSIX_NETWORKING;
 980 #else
 981       return -1;
 982 #endif
 983
 984     case _SC_READER_WRITER_LOCKS:
 985 #ifdef _POSIX_READER_WRITER_LOCKS
 986       return _POSIX_READER_WRITER_LOCKS;
 987 #else
 988       return -1;
 989 #endif
 990     case _SC_SPIN_LOCKS:
 991 #ifdef _POSIX_SPIN_LOCKS
 992       return _POSIX_SPIN_LOCKS;
 993 #else
 994       return -1;
 995 #endif
 996
 997     case _SC_REGEXP:
 998 #ifdef _POSIX_REGEXP
 999       return _POSIX_REGEXP;
1000 #else
1001       return -1;
1002 #endif
1003     case _SC_REGEX_VERSION:
1004 #ifdef _POSIX_REGEX_VERSION
1005       return _POSIX_REGEX_VERSION;
1006 #else
1007       return -1;
1008 #endif
1009
1010     case _SC_SHELL:
1011 #ifdef _POSIX_SHELL
1012       return _POSIX_SHELL;
1013 #else
1014       return -1;
1015 #endif
1016
1017     case _SC_SIGNALS:
1018 #ifdef _POSUX_SIGNALS
1019       return _POSIX_SIGNALS;
1020 #else
1021       return -1;
1022 #endif
1023
1024     case _SC_SPAWN:
1025 #ifdef _POSIX_SPAWN
1026       return _POSIX_SPAWN;
1027 #else
1028       return -1;
1029 #endif
1030
1031     case _SC_SPORADIC_SERVER:
1032 #ifdef _POSIX_SPORADIC_SERVER
1033       return _POSIX_SPORADIC_SERVER;
1034 #else
1035       return -1;
1036 #endif
1037     case _SC_THREAD_SPORADIC_SERVER:
1038 #ifdef _POSIX_THREAD_SPORADIC_SERVER
1039       return _POSIX_THREAD_SPORADIC_SERVER;
1040 #else
1041       return -1;
1042 #endif
1043
1044     case _SC_SYSTEM_DATABASE:
1045 #ifdef _POSIX_SYSTEM_DATABASE
1046       return _POSIX_SYSTEM_DATABASE;
1047 #else
1048       return -1;
1049 #endif
1050     case _SC_SYSTEM_DATABASE_R:
1051 #ifdef _POSIX_SYSTEM_DATABASE_R
1052       return _POSIX_SYSTEM_DATABASE_R;
1053 #else
1054       return -1;
1055 #endif
1056
1057     case _SC_THREAD_CPUTIME:
1058 #ifdef _POSIX_THREAD_CPUTIME
1059       return _POSIX_THREAD_CPUTIME;
1060 #else
1061       return -1;
1062 #endif
1063
1064     case _SC_TIMEOUTS:
1065 #ifdef _POSIX_TIMEOUTS
1066       return _POSIX_TIMEOUTS;
1067 #else
1068       return -1;
1069 #endif
1070
1071     case _SC_TYPED_MEMORY_OBJECTS:
1072 #ifdef _POSIX_TYPED_MEMORY_OBJECTS
1073       return _POSIX_TYPED_MEMORY_OBJECTS;
1074 #else
1075       return -1;
1076 #endif
1077
1078     case _SC_USER_GROUPS:
1079 #ifdef _POSIX_USER_GROUPS
1080       return _POSIX_USER_GROUPS;
1081 #else
1082       return -1;
1083 #endif
1084     case _SC_USER_GROUPS_R:
1085 #ifdef _POSIX_USER_GROUPS_R
1086       return _POSIX_USER_GROUPS_R;
1087 #else
1088       return -1;
1089 #endif
1090
1091     case _SC_2_PBS:
1092 #ifdef _POSIX2_PBS
1093       return _POSIX2_PBS;
1094 #else
1095       return -1;
1096 #endif
1097     case _SC_2_PBS_ACCOUNTING:
1098 #ifdef _POSIX2_PBS_ACCOUNTING
1099       return _POSIX2_PBS_ACCOUNTING;
1100 #else
1101       return -1;
1102 #endif
1103     case _SC_2_PBS_CHECKPOINT:
1104 #ifdef _POSIX2_PBS_CHECKPOINT
1105       return _POSIX2_PBS_CHECKPOINT;
1106 #else
1107       return -1;
1108 #endif
1109     case _SC_2_PBS_LOCATE:
1110 #ifdef _POSIX2_PBS_LOCATE
1111       return _POSIX2_PBS_LOCATE;
1112 #else
1113       return -1;
1114 #endif
1115     case _SC_2_PBS_MESSAGE:
1116 #ifdef _POSIX2_PBS_MESSAGE
1117       return _POSIX2_PBS_MESSAGE;
1118 #else
1119       return -1;
1120 #endif
1121     case _SC_2_PBS_TRACK:
1122 #ifdef _POSIX2_PBS_TRACK
1123       return _POSIX2_PBS_TRACK;
1124 #else
1125       return -1;
1126 #endif
1127
1128     case _SC_SYMLOOP_MAX:
1129 #ifdef SYMLOOP_MAX
1130       return SYMLOOP_MAX;
1131 #else
1132       return -1;
1133 #endif
1134
1135     case _SC_STREAMS:
1136 #ifdef _XOPEN_STREAMS
1137       return _XOPEN_STREAMS;
1138 #else
1139       return -1;
1140 #endif
1141
1142     case _SC_HOST_NAME_MAX:
1143 #ifdef HOST_NAME_MAX
1144       return HOST_NAME_MAX;
1145 #else
1146       return -1;
1147 #endif
1148
1149     case _SC_TRACE:
1150 #ifdef _POSIX_TRACE
1151       return _POSIX_TRACE;
1152 #else
1153       return -1;
1154 #endif
1155     case _SC_TRACE_EVENT_FILTER:
1156 #ifdef _POSIX_TRACE_EVENT_FILTER
1157       return _POSIX_TRACE_EVENT_FILTER;
1158 #else
1159       return -1;
1160 #endif
1161     case _SC_TRACE_INHERIT:
1162 #ifdef _POSIX_TRACE_INHERIT
1163       return _POSIX_TRACE_INHERIT;
1164 #else
1165       return -1;
1166 #endif
1167     case _SC_TRACE_LOG:
1168 #ifdef _POSIX_TRACE_LOG
1169       return _POSIX_TRACE_LOG;
1170 #else
1171       return -1;
1172 #endif
1173
1174     case _SC_LEVEL1_ICACHE_SIZE:
1175     case _SC_LEVEL1_ICACHE_ASSOC:
1176     case _SC_LEVEL1_ICACHE_LINESIZE:
1177     case _SC_LEVEL1_DCACHE_SIZE:
1178     case _SC_LEVEL1_DCACHE_ASSOC:
1179     case _SC_LEVEL1_DCACHE_LINESIZE:
1180     case _SC_LEVEL2_CACHE_SIZE:
1181     case _SC_LEVEL2_CACHE_ASSOC:
1182     case _SC_LEVEL2_CACHE_LINESIZE:
1183     case _SC_LEVEL3_CACHE_SIZE:
1184     case _SC_LEVEL3_CACHE_ASSOC:
1185     case _SC_LEVEL3_CACHE_LINESIZE:
1186     case _SC_LEVEL4_CACHE_SIZE:
1187     case _SC_LEVEL4_CACHE_ASSOC:
1188       /* In general we cannot determine these values.  Therefore we
1189          return zero which indicates that no information is
1190          available.  */
1191       return 0;
1192     }
1193 }
1194
1195 #undef __sysconf
1196 weak_alias (__sysconf, sysconf)
1197 libc_hidden_def (__sysconf)
1198
1199 static long int
1200 __sysconf_check_spec (const char *spec)
1201 {
1202   int save_errno = errno;
1203
1204   const char *getconf_dir = __secure_getenv ("GETCONF_DIR") ?: GETCONF_DIR;
1205   size_t getconf_dirlen = strlen (getconf_dir);
1206   size_t speclen = strlen (spec);
1207
1208   char name[getconf_dirlen + sizeof ("/_POSIX_V6_") + speclen];
1209   memcpy (mempcpy (mempcpy (name, getconf_dir, getconf_dirlen),
1210                    "/_POSIX_V6_", sizeof ("/_POSIX_V6_") - 1),
1211           spec, speclen + 1);
1212
1213   struct stat64 st;
1214   long int ret = __xstat64 (_STAT_VER, name, &st) >= 0 ? 1 : -1;
1215
1216   __set_errno (save_errno);
1217   return ret;
1218 }