sysdeps/posix/sysconf.c

   1 /* Copyright (C) 1991,1993,1995-1997,1999-2003,2004,2006,2009
   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 #define NEED_CHECK_SPEC \
  38   (!defined _XBS5_ILP32_OFF32 || !defined _XBS5_ILP32_OFFBIG \
  39    || !defined _XBS5_LP64_OFF64 || !defined _XBS5_LPBIG_OFFBIG \
  40    || !defined _POSIX_V6_ILP32_OFF32 || !defined _POSIX_V6_ILP32_OFFBIG \
  41    || !defined _POSIX_V6_LP64_OFF64 || !defined _POSIX_V6_LPBIG_OFFBIG \
  42    || !defined _POSIX_V7_ILP32_OFF32 || !defined _POSIX_V7_ILP32_OFFBIG \
  43    || !defined _POSIX_V7_LP64_OFF64 || !defined _POSIX_V7_LPBIG_OFFBIG)
  44 #if NEED_CHECK_SPEC
  45 static long int __sysconf_check_spec (const char *spec);
  46 #endif
  47
  48
  49 /* Get the value of the system variable NAME.  */
  50 long int
  51 __sysconf (name)
  52      int name;
  53 {
  54   switch (name)
  55     {
  56       /* Also add obsolete or unnecessarily added constants here.  */
  57     case _SC_EQUIV_CLASS_MAX:
  58     default:
  59       __set_errno (EINVAL);
  60       return -1;
  61
  62     case _SC_ARG_MAX:
  63 #ifdef  ARG_MAX
  64       return ARG_MAX;
  65 #else
  66       return -1;
  67 #endif
  68
  69     case _SC_CHILD_MAX:
  70 #ifdef  CHILD_MAX
  71       return CHILD_MAX;
  72 #else
  73       return __get_child_max ();
  74 #endif
  75
  76     case _SC_CLK_TCK:
  77       return __getclktck ();
  78
  79     case _SC_NGROUPS_MAX:
  80 #ifdef  NGROUPS_MAX
  81       return NGROUPS_MAX;
  82 #else
  83       return -1;
  84 #endif
  85
  86     case _SC_OPEN_MAX:
  87       return __getdtablesize ();
  88
  89     case _SC_STREAM_MAX:
  90 #ifdef  STREAM_MAX
  91       return STREAM_MAX;
  92 #else
  93       return FOPEN_MAX;
  94 #endif
  95
  96     case _SC_TZNAME_MAX:
  97       return MAX (__tzname_max (), _POSIX_TZNAME_MAX);
  98
  99     case _SC_JOB_CONTROL:
 100 #if _POSIX_JOB_CONTROL > 0
 101       return _POSIX_JOB_CONTROL;
 102 #else
 103       return -1;
 104 #endif
 105
 106     case _SC_SAVED_IDS:
 107 #if _POSIX_SAVED_IDS > 0
 108       return 1;
 109 #else
 110       return -1;
 111 #endif
 112
 113     case _SC_REALTIME_SIGNALS:
 114 #if _POSIX_REALTIME_SIGNALS > 0
 115       return _POSIX_REALTIME_SIGNALS;
 116 #else
 117       return -1;
 118 #endif
 119
 120     case _SC_PRIORITY_SCHEDULING:
 121 #if _POSIX_PRIORITY_SCHEDULING > 0
 122       return _POSIX_PRIORITY_SCHEDULING;
 123 #else
 124       return -1;
 125 #endif
 126
 127     case _SC_TIMERS:
 128 #if _POSIX_TIMERS > 0
 129       return _POSIX_TIMERS;
 130 #else
 131       return -1;
 132 #endif
 133
 134     case _SC_ASYNCHRONOUS_IO:
 135 #if _POSIX_ASYNCHRONOUS_IO > 0
 136       return _POSIX_ASYNCHRONOUS_IO;
 137 #else
 138       return -1;
 139 #endif
 140
 141     case _SC_PRIORITIZED_IO:
 142 #if _POSIX_PRIORITIZED_IO > 0
 143       return _POSIX_PRIORITIZED_IO;
 144 #else
 145       return -1;
 146 #endif
 147
 148     case _SC_SYNCHRONIZED_IO:
 149 #if _POSIX_SYNCHRONIZED_IO > 0
 150       return _POSIX_SYNCHRONIZED_IO;
 151 #else
 152       return -1;
 153 #endif
 154
 155     case _SC_FSYNC:
 156 #if _POSIX_FSYNC > 0
 157       return _POSIX_FSYNC;
 158 #else
 159       return -1;
 160 #endif
 161
 162     case _SC_MAPPED_FILES:
 163 #if _POSIX_MAPPED_FILES > 0
 164       return _POSIX_MAPPED_FILES;
 165 #else
 166       return -1;
 167 #endif
 168
 169     case _SC_MEMLOCK:
 170 #if _POSIX_MEMLOCK > 0
 171       return _POSIX_MEMLOCK;
 172 #else
 173       return -1;
 174 #endif
 175
 176     case _SC_MEMLOCK_RANGE:
 177 #if _POSIX_MEMLOCK_RANGE > 0
 178       return _POSIX_MEMLOCK_RANGE;
 179 #else
 180       return -1;
 181 #endif
 182
 183     case _SC_MEMORY_PROTECTION:
 184 #if _POSIX_MEMORY_PROTECTION > 0
 185       return _POSIX_MEMORY_PROTECTION;
 186 #else
 187       return -1;
 188 #endif
 189
 190     case _SC_MESSAGE_PASSING:
 191 #if _POSIX_MESSAGE_PASSING > 0
 192       return _POSIX_MESSAGE_PASSING;
 193 #else
 194       return -1;
 195 #endif
 196
 197     case _SC_SEMAPHORES:
 198 #if _POSIX_SEMAPHORES > 0
 199       return _POSIX_SEMAPHORES;
 200 #else
 201       return -1;
 202 #endif
 203
 204     case _SC_SHARED_MEMORY_OBJECTS:
 205 #if _POSIX_SHARED_MEMORY_OBJECTS > 0
 206       return _POSIX_SHARED_MEMORY_OBJECTS;
 207 #else
 208       return -1;
 209 #endif
 210
 211     case _SC_VERSION:
 212       return _POSIX_VERSION;
 213
 214     case _SC_PAGESIZE:
 215       return __getpagesize ();
 216
 217     case _SC_AIO_LISTIO_MAX:
 218 #ifdef  AIO_LISTIO_MAX
 219       return AIO_LISTIO_MAX;
 220 #else
 221       return -1;
 222 #endif
 223
 224     case _SC_AIO_MAX:
 225 #ifdef  AIO_MAX
 226       return AIO_MAX;
 227 #else
 228       return -1;
 229 #endif
 230
 231     case _SC_AIO_PRIO_DELTA_MAX:
 232 #ifdef  AIO_PRIO_DELTA_MAX
 233       return AIO_PRIO_DELTA_MAX;
 234 #else
 235       return -1;
 236 #endif
 237
 238     case _SC_DELAYTIMER_MAX:
 239 #ifdef  DELAYTIMER_MAX
 240       return DELAYTIMER_MAX;
 241 #else
 242       return -1;
 243 #endif
 244
 245     case _SC_MQ_OPEN_MAX:
 246 #ifdef  MQ_OPEN_MAX
 247       return MQ_OPEN_MAX;
 248 #else
 249       return -1;
 250 #endif
 251
 252     case _SC_MQ_PRIO_MAX:
 253 #ifdef  MQ_PRIO_MAX
 254       return MQ_PRIO_MAX;
 255 #else
 256       return -1;
 257 #endif
 258
 259     case _SC_RTSIG_MAX:
 260 #ifdef  RTSIG_MAX
 261       return RTSIG_MAX;
 262 #else
 263       return -1;
 264 #endif
 265
 266     case _SC_SEM_NSEMS_MAX:
 267 #ifdef  SEM_NSEMS_MAX
 268       return SEM_NSEMS_MAX;
 269 #else
 270       return -1;
 271 #endif
 272
 273     case _SC_SEM_VALUE_MAX:
 274 #ifdef  SEM_VALUE_MAX
 275       return SEM_VALUE_MAX;
 276 #else
 277       return -1;
 278 #endif
 279
 280     case _SC_SIGQUEUE_MAX:
 281 #ifdef  SIGQUEUE_MAX
 282       return SIGQUEUE_MAX;
 283 #else
 284       return -1;
 285 #endif
 286
 287     case _SC_TIMER_MAX:
 288 #ifdef  TIMER_MAX
 289       return TIMER_MAX;
 290 #else
 291       return -1;
 292 #endif
 293
 294     case _SC_BC_BASE_MAX:
 295 #ifdef  BC_BASE_MAX
 296       return BC_BASE_MAX;
 297 #else
 298       return -1;
 299 #endif
 300
 301     case _SC_BC_DIM_MAX:
 302 #ifdef  BC_DIM_MAX
 303       return BC_DIM_MAX;
 304 #else
 305       return -1;
 306 #endif
 307
 308     case _SC_BC_SCALE_MAX:
 309 #ifdef  BC_SCALE_MAX
 310       return BC_SCALE_MAX;
 311 #else
 312       return -1;
 313 #endif
 314
 315     case _SC_BC_STRING_MAX:
 316 #ifdef  BC_STRING_MAX
 317       return BC_STRING_MAX;
 318 #else
 319       return -1;
 320 #endif
 321
 322     case _SC_COLL_WEIGHTS_MAX:
 323 #ifdef  COLL_WEIGHTS_MAX
 324       return COLL_WEIGHTS_MAX;
 325 #else
 326       return -1;
 327 #endif
 328
 329     case _SC_EXPR_NEST_MAX:
 330 #ifdef  EXPR_NEST_MAX
 331       return EXPR_NEST_MAX;
 332 #else
 333       return -1;
 334 #endif
 335
 336     case _SC_LINE_MAX:
 337 #ifdef  LINE_MAX
 338       return LINE_MAX;
 339 #else
 340       return -1;
 341 #endif
 342
 343     case _SC_RE_DUP_MAX:
 344 #ifdef  RE_DUP_MAX
 345       return RE_DUP_MAX;
 346 #else
 347       return -1;
 348 #endif
 349
 350     case _SC_CHARCLASS_NAME_MAX:
 351 #ifdef  CHARCLASS_NAME_MAX
 352       return CHARCLASS_NAME_MAX;
 353 #else
 354       return -1;
 355 #endif
 356
 357     case _SC_PII:
 358 #if _POSIX_PII > 0
 359       return 1;
 360 #else
 361       return -1;
 362 #endif
 363
 364     case _SC_PII_XTI:
 365 #if _POSIX_PII_XTI > 0
 366       return 1;
 367 #else
 368       return -1;
 369 #endif
 370
 371     case _SC_PII_SOCKET:
 372 #if _POSIX_PII_SOCKET > 0
 373       return 1;
 374 #else
 375       return -1;
 376 #endif
 377
 378     case _SC_PII_INTERNET:
 379 #if _POSIX_PII_INTERNET > 0
 380       return 1;
 381 #else
 382       return -1;
 383 #endif
 384
 385     case _SC_PII_OSI:
 386 #if _POSIX_PII_OSI > 0
 387       return 1;
 388 #else
 389       return -1;
 390 #endif
 391
 392     case _SC_POLL:
 393 #if _POSIX_POLL > 0
 394       return 1;
 395 #else
 396       return -1;
 397 #endif
 398
 399     case _SC_SELECT:
 400 #if _POSIX_SELECT > 0
 401       return 1;
 402 #else
 403       return -1;
 404 #endif
 405
 406       /* The same as _SC_IOV_MAX.  */
 407     case _SC_UIO_MAXIOV:
 408 #ifdef  UIO_MAXIOV
 409       return UIO_MAXIOV;
 410 #else
 411       return -1;
 412 #endif
 413
 414     case _SC_PII_INTERNET_STREAM:
 415 #if _POSIX_PII_INTERNET_STREAM > 0
 416       return 1;
 417 #else
 418       return -1;
 419 #endif
 420
 421     case _SC_PII_INTERNET_DGRAM:
 422 #if _POSIX_PII_INTERNET_DGRAM > 0
 423       return 1;
 424 #else
 425       return -1;
 426 #endif
 427
 428     case _SC_PII_OSI_COTS:
 429 #if _POSIX_PII_OSI_COTS > 0
 430       return 1;
 431 #else
 432       return -1;
 433 #endif
 434
 435     case _SC_PII_OSI_CLTS:
 436 #if _POSIX_PII_OSI_CLTS > 0
 437       return 1;
 438 #else
 439       return -1;
 440 #endif
 441
 442     case _SC_PII_OSI_M:
 443 #if _POSIX_PII_OSI_M > 0
 444       return 1;
 445 #else
 446       return -1;
 447 #endif
 448
 449     case _SC_T_IOV_MAX:
 450 #ifdef  _T_IOV_MAX
 451       return _T_IOV_MAX;
 452 #else
 453       return -1;
 454 #endif
 455
 456     case _SC_2_VERSION:
 457       return _POSIX2_VERSION;
 458
 459     case _SC_2_C_BIND:
 460 #ifdef  _POSIX2_C_BIND
 461       return _POSIX2_C_BIND;
 462 #else
 463       return -1;
 464 #endif
 465
 466     case _SC_2_C_DEV:
 467 #ifdef  _POSIX2_C_DEV
 468       return _POSIX2_C_DEV;
 469 #else
 470       return -1;
 471 #endif
 472
 473     case _SC_2_C_VERSION:
 474 #ifdef  _POSIX2_C_VERSION
 475       return _POSIX2_C_VERSION;
 476 #else
 477       return -1;
 478 #endif
 479
 480     case _SC_2_FORT_DEV:
 481 #ifdef  _POSIX2_FORT_DEV
 482       return _POSIX2_FORT_DEV;
 483 #else
 484       return -1;
 485 #endif
 486
 487     case _SC_2_FORT_RUN:
 488 #ifdef  _POSIX2_FORT_RUN
 489       return _POSIX2_FORT_RUN;
 490 #else
 491       return -1;
 492 #endif
 493
 494     case _SC_2_LOCALEDEF:
 495 #ifdef  _POSIX2_LOCALEDEF
 496       return _POSIX2_LOCALEDEF;
 497 #else
 498       return -1;
 499 #endif
 500
 501     case _SC_2_SW_DEV:
 502 #ifdef  _POSIX2_SW_DEV
 503       return _POSIX2_SW_DEV;
 504 #else
 505       return -1;
 506 #endif
 507
 508     case _SC_2_CHAR_TERM:
 509 #ifdef  _POSIX2_CHAR_TERM
 510       return _POSIX2_CHAR_TERM;
 511 #else
 512       return -1;
 513 #endif
 514
 515     case _SC_2_UPE:
 516 #ifdef  _POSIX2_UPE
 517       return _POSIX2_UPE;
 518 #else
 519       return -1;
 520 #endif
 521
 522       /* POSIX 1003.1c (POSIX Threads).  */
 523     case _SC_THREADS:
 524 #if _POSIX_THREADS > 0
 525       return _POSIX_THREADS;
 526 #else
 527       return -1;
 528 #endif
 529
 530     case _SC_THREAD_SAFE_FUNCTIONS:
 531 #if _POSIX_THREAD_SAFE_FUNCTIONS > 0
 532       return _POSIX_THREAD_SAFE_FUNCTIONS;
 533 #else
 534       return -1;
 535 #endif
 536
 537     case _SC_GETGR_R_SIZE_MAX:
 538       return NSS_BUFLEN_GROUP;
 539
 540     case _SC_GETPW_R_SIZE_MAX:
 541       return NSS_BUFLEN_PASSWD;
 542
 543     case _SC_LOGIN_NAME_MAX:
 544 #ifdef  LOGIN_NAME_MAX
 545       return LOGIN_NAME_MAX;
 546 #else
 547       return -1;
 548 #endif
 549
 550     case _SC_TTY_NAME_MAX:
 551 #ifdef  TTY_NAME_MAX
 552       return TTY_NAME_MAX;
 553 #else
 554       return -1;
 555 #endif
 556
 557     case _SC_THREAD_DESTRUCTOR_ITERATIONS:
 558 #if _POSIX_THREAD_DESTRUCTOR_ITERATIONS > 0
 559       return _POSIX_THREAD_DESTRUCTOR_ITERATIONS;
 560 #else
 561       return -1;
 562 #endif
 563
 564     case _SC_THREAD_KEYS_MAX:
 565 #ifdef  PTHREAD_KEYS_MAX
 566       return PTHREAD_KEYS_MAX;
 567 #else
 568       return -1;
 569 #endif
 570
 571     case _SC_THREAD_STACK_MIN:
 572 #ifdef  PTHREAD_STACK_MIN
 573       return PTHREAD_STACK_MIN;
 574 #else
 575       return -1;
 576 #endif
 577
 578     case _SC_THREAD_THREADS_MAX:
 579 #ifdef  PTHREAD_THREADS_MAX
 580       return PTHREAD_THREADS_MAX;
 581 #else
 582       return -1;
 583 #endif
 584
 585     case _SC_THREAD_ATTR_STACKADDR:
 586 #if _POSIX_THREAD_ATTR_STACKADDR > 0
 587       return _POSIX_THREAD_ATTR_STACKADDR;
 588 #else
 589       return -1;
 590 #endif
 591
 592     case _SC_THREAD_ATTR_STACKSIZE:
 593 #if _POSIX_THREAD_ATTR_STACKSIZE > 0
 594       return _POSIX_THREAD_ATTR_STACKSIZE;
 595 #else
 596       return -1;
 597 #endif
 598
 599     case _SC_THREAD_PRIORITY_SCHEDULING:
 600 #if _POSIX_THREAD_PRIORITY_SCHEDULING > 0
 601       return _POSIX_THREAD_PRIORITY_SCHEDULING;
 602 #else
 603       return -1;
 604 #endif
 605
 606     case _SC_THREAD_PRIO_INHERIT:
 607 #if _POSIX_THREAD_PRIO_INHERIT > 0
 608       return _POSIX_THREAD_PRIO_INHERIT;
 609 #else
 610       return -1;
 611 #endif
 612
 613     case _SC_THREAD_PRIO_PROTECT:
 614 #if _POSIX_THREAD_PRIO_PROTECT > 0
 615       return _POSIX_THREAD_PRIO_PROTECT;
 616 #else
 617       return -1;
 618 #endif
 619
 620     case _SC_THREAD_PROCESS_SHARED:
 621 #if _POSIX_THREAD_PROCESS_SHARED > 0
 622       return _POSIX_THREAD_PROCESS_SHARED;
 623 #else
 624       return -1;
 625 #endif
 626
 627     case _SC_NPROCESSORS_CONF:
 628       return __get_nprocs_conf ();
 629
 630     case _SC_NPROCESSORS_ONLN:
 631       return __get_nprocs ();
 632
 633     case _SC_PHYS_PAGES:
 634       return __get_phys_pages ();
 635
 636     case _SC_AVPHYS_PAGES:
 637       return __get_avphys_pages ();
 638
 639     case _SC_ATEXIT_MAX:
 640       /* We have no limit since we use lists.  */
 641       return INT_MAX;
 642
 643     case _SC_PASS_MAX:
 644       /* We have no limit but since the return value might be used to
 645          allocate a buffer we restrict the value.  */
 646       return BUFSIZ;
 647
 648     case _SC_XOPEN_VERSION:
 649       return _XOPEN_VERSION;
 650
 651     case _SC_XOPEN_XCU_VERSION:
 652       return _XOPEN_XCU_VERSION;
 653
 654     case _SC_XOPEN_UNIX:
 655       return _XOPEN_UNIX;
 656
 657     case _SC_XOPEN_CRYPT:
 658 #ifdef  _XOPEN_CRYPT
 659       return _XOPEN_CRYPT;
 660 #else
 661       return -1;
 662 #endif
 663
 664     case _SC_XOPEN_ENH_I18N:
 665 #ifdef  _XOPEN_ENH_I18N
 666       return _XOPEN_ENH_I18N;
 667 #else
 668       return -1;
 669 #endif
 670
 671     case _SC_XOPEN_SHM:
 672 #ifdef  _XOPEN_SHM
 673       return _XOPEN_SHM;
 674 #else
 675       return -1;
 676 #endif
 677
 678     case _SC_XOPEN_XPG2:
 679 #ifdef  _XOPEN_XPG2
 680       return _XOPEN_XPG2;
 681 #else
 682       return -1;
 683 #endif
 684
 685     case _SC_XOPEN_XPG3:
 686 #ifdef  _XOPEN_XPG3
 687       return _XOPEN_XPG3;
 688 #else
 689       return -1;
 690 #endif
 691
 692     case _SC_XOPEN_XPG4:
 693 #ifdef  _XOPEN_XPG4
 694       return _XOPEN_XPG4;
 695 #else
 696       return -1;
 697 #endif
 698
 699     case _SC_CHAR_BIT:
 700       return CHAR_BIT;
 701
 702     case _SC_CHAR_MAX:
 703       return CHAR_MAX;
 704
 705     case _SC_CHAR_MIN:
 706       return CHAR_MIN;
 707
 708     case _SC_INT_MAX:
 709       return INT_MAX;
 710
 711     case _SC_INT_MIN:
 712       return INT_MIN;
 713
 714     case _SC_LONG_BIT:
 715       return sizeof (long int) * CHAR_BIT;
 716
 717     case _SC_WORD_BIT:
 718       return sizeof (int) * CHAR_BIT;
 719
 720     case _SC_MB_LEN_MAX:
 721       return MB_LEN_MAX;
 722
 723     case _SC_NZERO:
 724       return NZERO;
 725
 726     case _SC_SSIZE_MAX:
 727       return _POSIX_SSIZE_MAX;
 728
 729     case _SC_SCHAR_MAX:
 730       return SCHAR_MAX;
 731
 732     case _SC_SCHAR_MIN:
 733       return SCHAR_MIN;
 734
 735     case _SC_SHRT_MAX:
 736       return SHRT_MAX;
 737
 738     case _SC_SHRT_MIN:
 739       return SHRT_MIN;
 740
 741     case _SC_UCHAR_MAX:
 742       return UCHAR_MAX;
 743
 744     case _SC_UINT_MAX:
 745       return UINT_MAX;
 746
 747     case _SC_ULONG_MAX:
 748       return ULONG_MAX;
 749
 750     case _SC_USHRT_MAX:
 751       return USHRT_MAX;
 752
 753     case _SC_NL_ARGMAX:
 754 #ifdef  NL_ARGMAX
 755       return NL_ARGMAX;
 756 #else
 757       return -1;
 758 #endif
 759
 760     case _SC_NL_LANGMAX:
 761 #ifdef  NL_LANGMAX
 762       return NL_LANGMAX;
 763 #else
 764       return -1;
 765 #endif
 766
 767     case _SC_NL_MSGMAX:
 768 #ifdef  NL_MSGMAX
 769       return NL_MSGMAX;
 770 #else
 771       return -1;
 772 #endif
 773
 774     case _SC_NL_NMAX:
 775 #ifdef  NL_NMAX
 776       return NL_NMAX;
 777 #else
 778       return -1;
 779 #endif
 780
 781     case _SC_NL_SETMAX:
 782 #ifdef  NL_SETMAX
 783       return NL_SETMAX;
 784 #else
 785       return -1;
 786 #endif
 787
 788     case _SC_NL_TEXTMAX:
 789 #ifdef  NL_TEXTMAX
 790       return NL_TEXTMAX;
 791 #else
 792       return -1;
 793 #endif
 794
 795     case _SC_XBS5_ILP32_OFF32:
 796 #ifdef _XBS5_ILP32_OFF32
 797       return _XBS5_ILP32_OFF32;
 798 #else
 799       return __sysconf_check_spec ("ILP32_OFF32");
 800 #endif
 801     case _SC_XBS5_ILP32_OFFBIG:
 802 #ifdef _XBS5_ILP32_OFFBIG
 803       return _XBS5_ILP32_OFFBIG;
 804 #else
 805       return __sysconf_check_spec ("ILP32_OFFBIG");
 806 #endif
 807     case _SC_XBS5_LP64_OFF64:
 808 #ifdef _XBS5_LP64_OFF64
 809       return _XBS5_LP64_OFF64;
 810 #else
 811       return __sysconf_check_spec ("LP64_OFF64");
 812 #endif
 813     case _SC_XBS5_LPBIG_OFFBIG:
 814 #ifdef _XBS5_LPBIG_OFFBIG
 815       return _XBS5_LPBIG_OFFBIG;
 816 #else
 817       return __sysconf_check_spec ("LPBIG_OFFBIG");
 818 #endif
 819
 820     case _SC_V6_ILP32_OFF32:
 821 #ifdef _POSIX_V6_ILP32_OFF32
 822       return _POSIX_V6_ILP32_OFF32;
 823 #else
 824       return __sysconf_check_spec ("ILP32_OFF32");
 825 #endif
 826     case _SC_V6_ILP32_OFFBIG:
 827 #ifdef _POSIX_V6_ILP32_OFFBIG
 828       return _POSIX_V6_ILP32_OFFBIG;
 829 #else
 830       return __sysconf_check_spec ("ILP32_OFFBIG");
 831 #endif
 832     case _SC_V6_LP64_OFF64:
 833 #ifdef _POSIX_V6_LP64_OFF64
 834       return _POSIX_V6_LP64_OFF64;
 835 #else
 836       return __sysconf_check_spec ("LP64_OFF64");
 837 #endif
 838     case _SC_V6_LPBIG_OFFBIG:
 839 #ifdef _POSIX_V6_LPBIG_OFFBIG
 840       return _POSIX_V6_LPBIG_OFFBIG;
 841 #else
 842       return __sysconf_check_spec ("LPBIG_OFFBIG");
 843 #endif
 844
 845     case _SC_V7_ILP32_OFF32:
 846 #ifdef _POSIX_V7_ILP32_OFF32
 847       return _POSIX_V7_ILP32_OFF32;
 848 #else
 849       return __sysconf_check_spec ("ILP32_OFF32");
 850 #endif
 851     case _SC_V7_ILP32_OFFBIG:
 852 #ifdef _POSIX_V7_ILP32_OFFBIG
 853       return _POSIX_V7_ILP32_OFFBIG;
 854 #else
 855       return __sysconf_check_spec ("ILP32_OFFBIG");
 856 #endif
 857     case _SC_V7_LP64_OFF64:
 858 #ifdef _POSIX_V7_LP64_OFF64
 859       return _POSIX_V7_LP64_OFF64;
 860 #else
 861       return __sysconf_check_spec ("LP64_OFF64");
 862 #endif
 863     case _SC_V7_LPBIG_OFFBIG:
 864 #ifdef _POSIX_V7_LPBIG_OFFBIG
 865       return _POSIX_V7_LPBIG_OFFBIG;
 866 #else
 867       return __sysconf_check_spec ("LPBIG_OFFBIG");
 868 #endif
 869
 870     case _SC_XOPEN_LEGACY:
 871       return _XOPEN_LEGACY;
 872
 873     case _SC_XOPEN_REALTIME:
 874 #ifdef _XOPEN_REALTIME
 875       return _XOPEN_REALTIME;
 876 #else
 877       return -1;
 878 #endif
 879     case _SC_XOPEN_REALTIME_THREADS:
 880 #ifdef _XOPEN_REALTIME_THREADS
 881       return _XOPEN_REALTIME_THREADS;
 882 #else
 883       return -1;
 884 #endif
 885
 886     case _SC_ADVISORY_INFO:
 887 #if _POSIX_ADVISORY_INFO > 0
 888       return _POSIX_ADVISORY_INFO;
 889 #else
 890       return -1;
 891 #endif
 892
 893     case _SC_BARRIERS:
 894 #if _POSIX_BARRIERS > 0
 895       return _POSIX_BARRIERS;
 896 #else
 897       return -1;
 898 #endif
 899
 900     case _SC_BASE:
 901 #if _POSIX_BASE > 0
 902       return _POSIX_BASE;
 903 #else
 904       return -1;
 905 #endif
 906     case _SC_C_LANG_SUPPORT:
 907 #if _POSIX_C_LANG_SUPPORT > 0
 908       return _POSIX_C_LANG_SUPPORT;
 909 #else
 910       return -1;
 911 #endif
 912     case _SC_C_LANG_SUPPORT_R:
 913 #if _POSIX_C_LANG_SUPPORT_R > 0
 914       return _POSIX_C_LANG_SUPPORT_R;
 915 #else
 916       return -1;
 917 #endif
 918
 919     case _SC_CLOCK_SELECTION:
 920 #if _POSIX_CLOCK_SELECTION > 0
 921       return _POSIX_CLOCK_SELECTION;
 922 #else
 923       return -1;
 924 #endif
 925
 926     case _SC_CPUTIME:
 927 #if _POSIX_CPUTIME > 0
 928       return _POSIX_CPUTIME;
 929 #else
 930       return -1;
 931 #endif
 932
 933     case _SC_DEVICE_IO:
 934 #if _POSIX_DEVICE_IO > 0
 935       return _POSIX_DEVICE_IO;
 936 #else
 937       return -1;
 938 #endif
 939     case _SC_DEVICE_SPECIFIC:
 940 #if _POSIX_DEVICE_SPCIFIC > 0
 941       return _POSIX_DEVICE_SPECIFIC;
 942 #else
 943       return -1;
 944 #endif
 945     case _SC_DEVICE_SPECIFIC_R:
 946 #if _POSIX_DEVICE_SPCIFIC_R > 0
 947       return _POSIX_DEVICE_SPECIFIC_R;
 948 #else
 949       return -1;
 950 #endif
 951
 952     case _SC_FD_MGMT:
 953 #if _POSIX_FD_MGMT > 0
 954       return _POSIX_FD_MGMT;
 955 #else
 956       return -1;
 957 #endif
 958
 959     case _SC_FIFO:
 960 #if _POSIX_FIFO > 0
 961       return _POSIX_FIFO;
 962 #else
 963       return -1;
 964 #endif
 965     case _SC_PIPE:
 966 #if _POSIX_PIPE > 0
 967       return _POSIX_PIPE;
 968 #else
 969       return -1;
 970 #endif
 971
 972     case _SC_FILE_ATTRIBUTES:
 973 #if _POSIX_FILE_ATTRIBUTES > 0
 974       return _POSIX_FILE_ATTRIBUTES;
 975 #else
 976       return -1;
 977 #endif
 978     case _SC_FILE_LOCKING:
 979 #if _POSIX_FILE_LOCKING > 0
 980       return _POSIX_FILE_LOCKING;
 981 #else
 982       return -1;
 983 #endif
 984     case _SC_FILE_SYSTEM:
 985 #if _POSIX_FILE_SYSTEM > 0
 986       return _POSIX_FILE_SYSTEM;
 987 #else
 988       return -1;
 989 #endif
 990
 991     case _SC_MONOTONIC_CLOCK:
 992 #if _POSIX_MONOTONIC_CLOCK
 993       return _POSIX_MONOTONIC_CLOCK;
 994 #else
 995       return -1;
 996 #endif
 997
 998     case _SC_MULTI_PROCESS:
 999 #if _POSIX_MULTI_PROCESS > 0
1000       return _POSIX_MULTI_PROCESS;
1001 #else
1002       return -1;
1003 #endif
1004     case _SC_SINGLE_PROCESS:
1005 #if _POSIX_SINGLE_PROCESS > 0
1006       return _POSIX_SINGLE_PROCESS;
1007 #else
1008       return -1;
1009 #endif
1010
1011     case _SC_NETWORKING:
1012 #if _POSIX_NETWORKING > 0
1013       return _POSIX_NETWORKING;
1014 #else
1015       return -1;
1016 #endif
1017
1018     case _SC_READER_WRITER_LOCKS:
1019 #if _POSIX_READER_WRITER_LOCKS > 0
1020       return _POSIX_READER_WRITER_LOCKS;
1021 #else
1022       return -1;
1023 #endif
1024     case _SC_SPIN_LOCKS:
1025 #if _POSIX_SPIN_LOCKS > 0
1026       return _POSIX_SPIN_LOCKS;
1027 #else
1028       return -1;
1029 #endif
1030
1031     case _SC_REGEXP:
1032 #if _POSIX_REGEXP > 0
1033       return _POSIX_REGEXP;
1034 #else
1035       return -1;
1036 #endif
1037     case _SC_REGEX_VERSION:
1038 #if _POSIX_REGEX_VERSION > 0
1039       return _POSIX_REGEX_VERSION;
1040 #else
1041       return -1;
1042 #endif
1043
1044     case _SC_SHELL:
1045 #if _POSIX_SHELL > 0
1046       return _POSIX_SHELL;
1047 #else
1048       return -1;
1049 #endif
1050
1051     case _SC_SIGNALS:
1052 #ifdef _POSUX_SIGNALS
1053       return _POSIX_SIGNALS;
1054 #else
1055       return -1;
1056 #endif
1057
1058     case _SC_SPAWN:
1059 #if _POSIX_SPAWN > 0
1060       return _POSIX_SPAWN;
1061 #else
1062       return -1;
1063 #endif
1064
1065     case _SC_SPORADIC_SERVER:
1066 #if _POSIX_SPORADIC_SERVER > 0
1067       return _POSIX_SPORADIC_SERVER;
1068 #else
1069       return -1;
1070 #endif
1071     case _SC_THREAD_SPORADIC_SERVER:
1072 #if _POSIX_THREAD_SPORADIC_SERVER > 0
1073       return _POSIX_THREAD_SPORADIC_SERVER;
1074 #else
1075       return -1;
1076 #endif
1077
1078     case _SC_SYSTEM_DATABASE:
1079 #if _POSIX_SYSTEM_DATABASE > 0
1080       return _POSIX_SYSTEM_DATABASE;
1081 #else
1082       return -1;
1083 #endif
1084     case _SC_SYSTEM_DATABASE_R:
1085 #if _POSIX_SYSTEM_DATABASE_R > 0
1086       return _POSIX_SYSTEM_DATABASE_R;
1087 #else
1088       return -1;
1089 #endif
1090
1091     case _SC_THREAD_CPUTIME:
1092 #if _POSIX_THREAD_CPUTIME > 0
1093       return _POSIX_THREAD_CPUTIME;
1094 #else
1095       return -1;
1096 #endif
1097
1098     case _SC_TIMEOUTS:
1099 #if _POSIX_TIMEOUTS > 0
1100       return _POSIX_TIMEOUTS;
1101 #else
1102       return -1;
1103 #endif
1104
1105     case _SC_TYPED_MEMORY_OBJECTS:
1106 #if _POSIX_TYPED_MEMORY_OBJECTS > 0
1107       return _POSIX_TYPED_MEMORY_OBJECTS;
1108 #else
1109       return -1;
1110 #endif
1111
1112     case _SC_USER_GROUPS:
1113 #if _POSIX_USER_GROUPS > 0
1114       return _POSIX_USER_GROUPS;
1115 #else
1116       return -1;
1117 #endif
1118     case _SC_USER_GROUPS_R:
1119 #if _POSIX_USER_GROUPS_R > 0
1120       return _POSIX_USER_GROUPS_R;
1121 #else
1122       return -1;
1123 #endif
1124
1125     case _SC_2_PBS:
1126 #ifdef _POSIX2_PBS
1127       return _POSIX2_PBS;
1128 #else
1129       return -1;
1130 #endif
1131     case _SC_2_PBS_ACCOUNTING:
1132 #ifdef _POSIX2_PBS_ACCOUNTING
1133       return _POSIX2_PBS_ACCOUNTING;
1134 #else
1135       return -1;
1136 #endif
1137     case _SC_2_PBS_CHECKPOINT:
1138 #ifdef _POSIX2_PBS_CHECKPOINT
1139       return _POSIX2_PBS_CHECKPOINT;
1140 #else
1141       return -1;
1142 #endif
1143     case _SC_2_PBS_LOCATE:
1144 #ifdef _POSIX2_PBS_LOCATE
1145       return _POSIX2_PBS_LOCATE;
1146 #else
1147       return -1;
1148 #endif
1149     case _SC_2_PBS_MESSAGE:
1150 #ifdef _POSIX2_PBS_MESSAGE
1151       return _POSIX2_PBS_MESSAGE;
1152 #else
1153       return -1;
1154 #endif
1155     case _SC_2_PBS_TRACK:
1156 #ifdef _POSIX2_PBS_TRACK
1157       return _POSIX2_PBS_TRACK;
1158 #else
1159       return -1;
1160 #endif
1161
1162     case _SC_SYMLOOP_MAX:
1163 #ifdef SYMLOOP_MAX
1164       return SYMLOOP_MAX;
1165 #else
1166       return -1;
1167 #endif
1168
1169     case _SC_STREAMS:
1170 #ifdef _XOPEN_STREAMS
1171       return _XOPEN_STREAMS;
1172 #else
1173       return -1;
1174 #endif
1175
1176     case _SC_HOST_NAME_MAX:
1177 #ifdef HOST_NAME_MAX
1178       return HOST_NAME_MAX;
1179 #else
1180       return -1;
1181 #endif
1182
1183     case _SC_TRACE:
1184 #if _POSIX_TRACE > 0
1185       return _POSIX_TRACE;
1186 #else
1187       return -1;
1188 #endif
1189     case _SC_TRACE_EVENT_FILTER:
1190 #if _POSIX_TRACE_EVENT_FILTER > 0
1191       return _POSIX_TRACE_EVENT_FILTER;
1192 #else
1193       return -1;
1194 #endif
1195     case _SC_TRACE_INHERIT:
1196 #if _POSIX_TRACE_INHERIT > 0
1197       return _POSIX_TRACE_INHERIT;
1198 #else
1199       return -1;
1200 #endif
1201     case _SC_TRACE_LOG:
1202 #if _POSIX_TRACE_LOG > 0
1203       return _POSIX_TRACE_LOG;
1204 #else
1205       return -1;
1206 #endif
1207
1208     case _SC_TRACE_EVENT_NAME_MAX:
1209     case _SC_TRACE_NAME_MAX:
1210     case _SC_TRACE_SYS_MAX:
1211     case _SC_TRACE_USER_EVENT_MAX:
1212       /* No support for tracing.  */
1213
1214     case _SC_XOPEN_STREAMS:
1215       /* No support for STREAMS.  */
1216       return -1;
1217
1218     case _SC_LEVEL1_ICACHE_SIZE:
1219     case _SC_LEVEL1_ICACHE_ASSOC:
1220     case _SC_LEVEL1_ICACHE_LINESIZE:
1221     case _SC_LEVEL1_DCACHE_SIZE:
1222     case _SC_LEVEL1_DCACHE_ASSOC:
1223     case _SC_LEVEL1_DCACHE_LINESIZE:
1224     case _SC_LEVEL2_CACHE_SIZE:
1225     case _SC_LEVEL2_CACHE_ASSOC:
1226     case _SC_LEVEL2_CACHE_LINESIZE:
1227     case _SC_LEVEL3_CACHE_SIZE:
1228     case _SC_LEVEL3_CACHE_ASSOC:
1229     case _SC_LEVEL3_CACHE_LINESIZE:
1230     case _SC_LEVEL4_CACHE_SIZE:
1231     case _SC_LEVEL4_CACHE_ASSOC:
1232       /* In general we cannot determine these values.  Therefore we
1233          return zero which indicates that no information is
1234          available.  */
1235       return 0;
1236
1237     case _SC_IPV6:
1238 #if _POSIX_IPV6 > 0
1239       return _POSIX_IPV6;
1240 #else
1241       return -1;
1242 #endif
1243
1244     case _SC_RAW_SOCKETS:
1245 #if _POSIX_RAW_SOCKETS > 0
1246       return _POSIX_RAW_SOCKETS;
1247 #else
1248       return -1;
1249 #endif
1250     }
1251 }
1252
1253 #undef __sysconf
1254 weak_alias (__sysconf, sysconf)
1255 libc_hidden_def (__sysconf)
1256
1257 #if NEED_CHECK_SPEC
1258 static long int
1259 __sysconf_check_spec (const char *spec)
1260 {
1261   int save_errno = errno;
1262
1263   const char *getconf_dir = __secure_getenv ("GETCONF_DIR") ?: GETCONF_DIR;
1264   size_t getconf_dirlen = strlen (getconf_dir);
1265   size_t speclen = strlen (spec);
1266
1267   char name[getconf_dirlen + sizeof ("/POSIX_V6_") + speclen];
1268   memcpy (mempcpy (mempcpy (name, getconf_dir, getconf_dirlen),
1269                    "/POSIX_V6_", sizeof ("/POSIX_V6_") - 1),
1270           spec, speclen + 1);
1271
1272   struct stat64 st;
1273   long int ret = __xstat64 (_STAT_VER, name, &st) >= 0 ? 1 : -1;
1274
1275   __set_errno (save_errno);
1276   return ret;
1277 }
1278 #endif