sysdeps/posix/sysconf.c

   1 /* Copyright (C) 1991,93,95,96,97,99,2000,2001 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 Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the 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    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 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 #include <sys/param.h>
  28 #include <sys/sysinfo.h>
  29 #include <sys/types.h>
  30 #include <regex.h>
  31
  32
  33 /* Get the value of the system variable NAME.  */
  34 long int
  35 __sysconf (name)
  36      int name;
  37 {
  38   switch (name)
  39     {
  40     default:
  41       __set_errno (EINVAL);
  42       return -1;
  43
  44     case _SC_ARG_MAX:
  45 #ifdef  ARG_MAX
  46       return ARG_MAX;
  47 #else
  48       return -1;
  49 #endif
  50
  51     case _SC_CHILD_MAX:
  52 #ifdef  CHILD_MAX
  53       return CHILD_MAX;
  54 #else
  55       return -1;
  56 #endif
  57
  58     case _SC_CLK_TCK:
  59       return __getclktck ();
  60
  61     case _SC_NGROUPS_MAX:
  62 #ifdef  NGROUPS_MAX
  63       return NGROUPS_MAX;
  64 #else
  65       return -1;
  66 #endif
  67
  68     case _SC_OPEN_MAX:
  69       return __getdtablesize ();
  70
  71     case _SC_STREAM_MAX:
  72 #ifdef  STREAM_MAX
  73       return STREAM_MAX;
  74 #else
  75       return FOPEN_MAX;
  76 #endif
  77
  78     case _SC_TZNAME_MAX:
  79       return MAX (__tzname_max (), _POSIX_TZNAME_MAX);
  80
  81     case _SC_JOB_CONTROL:
  82 #ifdef  _POSIX_JOB_CONTROL
  83       return 1;
  84 #else
  85       return -1;
  86 #endif
  87
  88     case _SC_SAVED_IDS:
  89 #ifdef  _POSIX_SAVED_IDS
  90       return 1;
  91 #else
  92       return -1;
  93 #endif
  94
  95     case _SC_REALTIME_SIGNALS:
  96 #ifdef  _POSIX_REALTIME_SIGNALS
  97       return 1;
  98 #else
  99       return -1;
 100 #endif
 101
 102     case _SC_PRIORITY_SCHEDULING:
 103 #ifdef  _POSIX_PRIORITY_SCHEDULING
 104       return 1;
 105 #else
 106       return -1;
 107 #endif
 108
 109     case _SC_TIMERS:
 110 #ifdef  _POSIX_TIMERS
 111       return 1;
 112 #else
 113       return -1;
 114 #endif
 115
 116     case _SC_ASYNCHRONOUS_IO:
 117 #ifdef  _POSIX_ASYNCHRONOUS_IO
 118       return 1;
 119 #else
 120       return -1;
 121 #endif
 122
 123     case _SC_PRIORITIZED_IO:
 124 #ifdef  _POSIX_PRIORITIZED_IO
 125       return 1;
 126 #else
 127       return -1;
 128 #endif
 129
 130     case _SC_SYNCHRONIZED_IO:
 131 #ifdef  _POSIX_SYNCHRONIZED_IO
 132       return 1;
 133 #else
 134       return -1;
 135 #endif
 136
 137     case _SC_FSYNC:
 138 #ifdef  _POSIX_FSYNC
 139       return 1;
 140 #else
 141       return -1;
 142 #endif
 143
 144     case _SC_MAPPED_FILES:
 145 #ifdef  _POSIX_MAPPED_FILES
 146       return 1;
 147 #else
 148       return -1;
 149 #endif
 150
 151     case _SC_MEMLOCK:
 152 #ifdef  _POSIX_MEMLOCK
 153       return 1;
 154 #else
 155       return -1;
 156 #endif
 157
 158     case _SC_MEMLOCK_RANGE:
 159 #ifdef  _POSIX_MEMLOCK_RANGE
 160       return 1;
 161 #else
 162       return -1;
 163 #endif
 164
 165     case _SC_MEMORY_PROTECTION:
 166 #ifdef  _POSIX_MEMORY_PROTECTION
 167       return 1;
 168 #else
 169       return -1;
 170 #endif
 171
 172     case _SC_MESSAGE_PASSING:
 173 #ifdef  _POSIX_MESSAGE_PASSING
 174       return 1;
 175 #else
 176       return -1;
 177 #endif
 178
 179     case _SC_SEMAPHORES:
 180 #ifdef  _POSIX_SEMAPHORES
 181       return 1;
 182 #else
 183       return -1;
 184 #endif
 185
 186     case _SC_SHARED_MEMORY_OBJECTS:
 187 #ifdef  _POSIX_SHARED_MEMORY_OBJECTS
 188       return 1;
 189 #else
 190       return -1;
 191 #endif
 192
 193     case _SC_VERSION:
 194       return _POSIX_VERSION;
 195
 196     case _SC_PAGESIZE:
 197       return __getpagesize ();
 198
 199     case _SC_AIO_LISTIO_MAX:
 200 #ifdef  AIO_LISTIO_MAX
 201       return AIO_LISTIO_MAX;
 202 #else
 203       return -1;
 204 #endif
 205
 206     case _SC_AIO_MAX:
 207 #ifdef  AIO_MAX
 208       return AIO_MAX;
 209 #else
 210       return -1;
 211 #endif
 212
 213     case _SC_AIO_PRIO_DELTA_MAX:
 214 #ifdef  AIO_PRIO_DELTA_MAX
 215       return AIO_PRIO_DELTA_MAX;
 216 #else
 217       return -1;
 218 #endif
 219
 220     case _SC_DELAYTIMER_MAX:
 221 #ifdef  DELAYTIMER_MAX
 222       return DELAYTIMER_MAX;
 223 #else
 224       return -1;
 225 #endif
 226
 227     case _SC_MQ_OPEN_MAX:
 228 #ifdef  MQ_OPEN_MAX
 229       return MQ_OPEN_MAX;
 230 #else
 231       return -1;
 232 #endif
 233
 234     case _SC_MQ_PRIO_MAX:
 235 #ifdef  MQ_PRIO_MAX
 236       return MQ_PRIO_MAX;
 237 #else
 238       return -1;
 239 #endif
 240
 241     case _SC_RTSIG_MAX:
 242 #ifdef  RTSIG_MAX
 243       return RTSIG_MAX;
 244 #else
 245       return -1;
 246 #endif
 247
 248     case _SC_SEM_NSEMS_MAX:
 249 #ifdef  SEM_NSEMS_MAX
 250       return SEM_NSEMS_MAX;
 251 #else
 252       return -1;
 253 #endif
 254
 255     case _SC_SEM_VALUE_MAX:
 256 #ifdef  SEM_VALUE_MAX
 257       return SEM_VALUE_MAX;
 258 #else
 259       return -1;
 260 #endif
 261
 262     case _SC_SIGQUEUE_MAX:
 263 #ifdef  SIGQUEUE_MAX
 264       return SIGQUEUE_MAX;
 265 #else
 266       return -1;
 267 #endif
 268
 269     case _SC_TIMER_MAX:
 270 #ifdef  TIMER_MAX
 271       return TIMER_MAX;
 272 #else
 273       return -1;
 274 #endif
 275
 276     case _SC_BC_BASE_MAX:
 277 #ifdef  BC_BASE_MAX
 278       return BC_BASE_MAX;
 279 #else
 280       return -1;
 281 #endif
 282
 283     case _SC_BC_DIM_MAX:
 284 #ifdef  BC_DIM_MAX
 285       return BC_DIM_MAX;
 286 #else
 287       return -1;
 288 #endif
 289
 290     case _SC_BC_SCALE_MAX:
 291 #ifdef  BC_SCALE_MAX
 292       return BC_SCALE_MAX;
 293 #else
 294       return -1;
 295 #endif
 296
 297     case _SC_BC_STRING_MAX:
 298 #ifdef  BC_STRING_MAX
 299       return BC_STRING_MAX;
 300 #else
 301       return -1;
 302 #endif
 303
 304     case _SC_COLL_WEIGHTS_MAX:
 305 #ifdef  COLL_WEIGHTS_MAX
 306       return COLL_WEIGHTS_MAX;
 307 #else
 308       return -1;
 309 #endif
 310
 311     case _SC_EXPR_NEST_MAX:
 312 #ifdef  EXPR_NEST_MAX
 313       return EXPR_NEST_MAX;
 314 #else
 315       return -1;
 316 #endif
 317
 318     case _SC_LINE_MAX:
 319 #ifdef  LINE_MAX
 320       return LINE_MAX;
 321 #else
 322       return -1;
 323 #endif
 324
 325     case _SC_RE_DUP_MAX:
 326 #ifdef  RE_DUP_MAX
 327       return RE_DUP_MAX;
 328 #else
 329       return -1;
 330 #endif
 331
 332     case _SC_CHARCLASS_NAME_MAX:
 333 #ifdef  CHARCLASS_NAME_MAX
 334       return CHARCLASS_NAME_MAX;
 335 #else
 336       return -1;
 337 #endif
 338
 339     case _SC_PII:
 340 #ifdef  _POSIX_PII
 341       return 1;
 342 #else
 343       return -1;
 344 #endif
 345
 346     case _SC_PII_XTI:
 347 #ifdef  _POSIX_PII_XTI
 348       return 1;
 349 #else
 350       return -1;
 351 #endif
 352
 353     case _SC_PII_SOCKET:
 354 #ifdef  _POSIX_PII_SOCKET
 355       return 1;
 356 #else
 357       return -1;
 358 #endif
 359
 360     case _SC_PII_INTERNET:
 361 #ifdef  _POSIX_PII_INTERNET
 362       return 1;
 363 #else
 364       return -1;
 365 #endif
 366
 367     case _SC_PII_OSI:
 368 #ifdef  _POSIX_PII_OSI
 369       return 1;
 370 #else
 371       return -1;
 372 #endif
 373
 374     case _SC_POLL:
 375 #ifdef  _POSIX_POLL
 376       return 1;
 377 #else
 378       return -1;
 379 #endif
 380
 381     case _SC_SELECT:
 382 #ifdef  _POSIX_SELECT
 383       return 1;
 384 #else
 385       return -1;
 386 #endif
 387
 388     case _SC_UIO_MAXIOV:
 389 #ifdef  UIO_MAXIOV
 390       return UIO_MAXIOV;
 391 #else
 392       return -1;
 393 #endif
 394
 395     case _SC_PII_INTERNET_STREAM:
 396 #ifdef  _POSIX_PII_INTERNET_STREAM
 397       return 1;
 398 #else
 399       return -1;
 400 #endif
 401
 402     case _SC_PII_INTERNET_DGRAM:
 403 #ifdef  _POSIX_PII_INTERNET_DGRAM
 404       return 1;
 405 #else
 406       return -1;
 407 #endif
 408
 409     case _SC_PII_OSI_COTS:
 410 #ifdef  _POSIX_PII_OSI_COTS
 411       return 1;
 412 #else
 413       return -1;
 414 #endif
 415
 416     case _SC_PII_OSI_CLTS:
 417 #ifdef  _POSIX_PII_OSI_CLTS
 418       return 1;
 419 #else
 420       return -1;
 421 #endif
 422
 423     case _SC_PII_OSI_M:
 424 #ifdef  _POSIX_PII_OSI_M
 425       return 1;
 426 #else
 427       return -1;
 428 #endif
 429
 430     case _SC_T_IOV_MAX:
 431 #ifdef  _T_IOV_MAX
 432       return _T_IOV_MAX;
 433 #else
 434       return -1;
 435 #endif
 436
 437     case _SC_2_VERSION:
 438       return _POSIX2_VERSION;
 439
 440     case _SC_2_C_BIND:
 441 #ifdef  _POSIX2_C_BIND
 442       return _POSIX2_C_BIND;
 443 #else
 444       return -1;
 445 #endif
 446
 447     case _SC_2_C_DEV:
 448 #ifdef  _POSIX2_C_DEV
 449       return _POSIX2_C_DEV;
 450 #else
 451       return -1;
 452 #endif
 453
 454     case _SC_2_C_VERSION:
 455 #ifdef  _POSIX2_C_VERSION
 456       return _POSIX2_C_VERSION;
 457 #else
 458       return -1;
 459 #endif
 460
 461     case _SC_2_FORT_DEV:
 462 #ifdef  _POSIX2_FORT_DEV
 463       return _POSIX2_FORT_DEV;
 464 #else
 465       return -1;
 466 #endif
 467
 468     case _SC_2_LOCALEDEF:
 469 #ifdef  _POSIX2_LOCALEDEF
 470       return _POSIX2_LOCALEDEF;
 471 #else
 472       return -1;
 473 #endif
 474
 475     case _SC_2_SW_DEV:
 476 #ifdef  _POSIX2_SW_DEV
 477       return _POSIX2_SW_DEV;
 478 #else
 479       return -1;
 480 #endif
 481
 482     case _SC_2_CHAR_TERM:
 483 #ifdef  _POSIX2_CHAR_TERM
 484       return _POSIX2_CHAR_TERM;
 485 #else
 486       return -1;
 487 #endif
 488
 489     case _SC_2_UPE:
 490 #ifdef  _POSIX2_UPE
 491       return _POSIX2_UPE;
 492 #else
 493       return -1;
 494 #endif
 495
 496       /* POSIX 1003.1c (POSIX Threads).  */
 497     case _SC_THREADS:
 498 #ifdef  _POSIX_THREADS
 499       return 1;
 500 #else
 501       return -1;
 502 #endif
 503
 504     case _SC_THREAD_SAFE_FUNCTIONS:
 505 #ifdef  _POSIX_THREAD_SAFE_FUNCTIONS
 506       return 1;
 507 #else
 508       return -1;
 509 #endif
 510
 511     case _SC_GETGR_R_SIZE_MAX:
 512 #ifdef  NSS_BUFLEN_GROUP
 513       return NSS_BUFLEN_GROUP;
 514 #else
 515       return -1;
 516 #endif
 517
 518     case _SC_GETPW_R_SIZE_MAX:
 519 #ifdef  NSS_BUFLEN_PASSWD
 520       return NSS_BUFLEN_PASSWD;
 521 #else
 522       return -1;
 523 #endif
 524
 525     case _SC_LOGIN_NAME_MAX:
 526 #ifdef  _POSIX_LOGIN_NAME_MAX
 527       return _POSIX_LOGIN_NAME_MAX;
 528 #else
 529       return -1;
 530 #endif
 531
 532     case _SC_TTY_NAME_MAX:
 533 #ifdef  _POSIX_TTY_NAME_MAX
 534       return _POSIX_TTY_NAME_MAX;
 535 #else
 536       return -1;
 537 #endif
 538
 539     case _SC_THREAD_DESTRUCTOR_ITERATIONS:
 540 #ifdef  _POSIX_THREAD_DESTRUCTOR_ITERATIONS
 541       return _POSIX_THREAD_DESTRUCTOR_ITERATIONS;
 542 #else
 543       return -1;
 544 #endif
 545
 546     case _SC_THREAD_KEYS_MAX:
 547 #ifdef  PTHREAD_KEYS_MAX
 548       return PTHREAD_KEYS_MAX;
 549 #else
 550       return -1;
 551 #endif
 552
 553     case _SC_THREAD_STACK_MIN:
 554 #ifdef  PTHREAD_STACK_MIN
 555       return PTHREAD_STACK_MIN;
 556 #else
 557       return -1;
 558 #endif
 559
 560     case _SC_THREAD_THREADS_MAX:
 561 #ifdef  PTHREAD_THREADS_MAX
 562       return PTHREAD_THREADS_MAX;
 563 #else
 564       return -1;
 565 #endif
 566
 567     case _SC_THREAD_ATTR_STACKADDR:
 568 #ifdef  _POSIX_THREAD_ATTR_STACKADDR
 569       return 1;
 570 #else
 571       return -1;
 572 #endif
 573
 574     case _SC_THREAD_ATTR_STACKSIZE:
 575 #ifdef  _POSIX_THREAD_ATTR_STACKSIZE
 576       return 1;
 577 #else
 578       return -1;
 579 #endif
 580
 581     case _SC_THREAD_PRIORITY_SCHEDULING:
 582 #ifdef  _POSIX_THREAD_PRIORITY_SCHEDULING
 583       return 1;
 584 #else
 585       return -1;
 586 #endif
 587
 588     case _SC_THREAD_PRIO_INHERIT:
 589 #ifdef  _POSIX_THREAD_PRIO_INHERIT
 590       return 1;
 591 #else
 592       return -1;
 593 #endif
 594
 595     case _SC_THREAD_PRIO_PROTECT:
 596 #ifdef  _POSIX_THREAD_PRIO_PROTECT
 597       return 1;
 598 #else
 599       return -1;
 600 #endif
 601
 602     case _SC_THREAD_PROCESS_SHARED:
 603 #ifdef  _POSIX_THREAD_PROCESS_SHARED
 604       return 1;
 605 #else
 606       return -1;
 607 #endif
 608
 609     case _SC_NPROCESSORS_CONF:
 610       return __get_nprocs_conf ();
 611
 612     case _SC_NPROCESSORS_ONLN:
 613       return __get_nprocs ();
 614
 615     case _SC_PHYS_PAGES:
 616       return __get_phys_pages ();
 617
 618     case _SC_AVPHYS_PAGES:
 619       return __get_avphys_pages ();
 620
 621     case _SC_ATEXIT_MAX:
 622       /* We have no limit since we use lists.  */
 623       return INT_MAX;
 624
 625     case _SC_PASS_MAX:
 626       /* We have no limit but since the return value might be used to
 627          allocate a buffer we restrict the value.  */
 628       return BUFSIZ;
 629
 630     case _SC_XOPEN_VERSION:
 631       return _XOPEN_VERSION;
 632
 633     case _SC_XOPEN_XCU_VERSION:
 634       return _XOPEN_XCU_VERSION;
 635
 636     case _SC_XOPEN_UNIX:
 637       return _XOPEN_UNIX;
 638
 639     case _SC_XOPEN_CRYPT:
 640 #ifdef  _XOPEN_CRYPT
 641       return _XOPEN_CRYPT;
 642 #else
 643       return -1;
 644 #endif
 645
 646     case _SC_XOPEN_ENH_I18N:
 647 #ifdef  _XOPEN_ENH_I18N
 648       return _XOPEN_ENH_I18N;
 649 #else
 650       return -1;
 651 #endif
 652
 653     case _SC_XOPEN_SHM:
 654 #ifdef  _XOPEN_SHM
 655       return _XOPEN_SHM;
 656 #else
 657       return -1;
 658 #endif
 659
 660     case _SC_XOPEN_XPG2:
 661 #ifdef  _XOPEN_XPG2
 662       return _XOPEN_XPG2;
 663 #else
 664       return -1;
 665 #endif
 666
 667     case _SC_XOPEN_XPG3:
 668 #ifdef  _XOPEN_XPG3
 669       return _XOPEN_XPG3;
 670 #else
 671       return -1;
 672 #endif
 673
 674     case _SC_XOPEN_XPG4:
 675 #ifdef  _XOPEN_XPG4
 676       return _XOPEN_XPG4;
 677 #else
 678       return -1;
 679 #endif
 680
 681     case _SC_CHAR_BIT:
 682       return CHAR_BIT;
 683
 684     case _SC_CHAR_MAX:
 685       return CHAR_MAX;
 686
 687     case _SC_CHAR_MIN:
 688       return CHAR_MIN;
 689
 690     case _SC_INT_MAX:
 691       return INT_MAX;
 692
 693     case _SC_INT_MIN:
 694       return INT_MIN;
 695
 696     case _SC_LONG_BIT:
 697       return sizeof (long int) * CHAR_BIT;
 698
 699     case _SC_WORD_BIT:
 700       return sizeof (int) * CHAR_BIT;
 701
 702     case _SC_MB_LEN_MAX:
 703       return MB_LEN_MAX;
 704
 705     case _SC_NZERO:
 706       return NZERO;
 707
 708     case _SC_SSIZE_MAX:
 709       return _POSIX_SSIZE_MAX;
 710
 711     case _SC_SCHAR_MAX:
 712       return SCHAR_MAX;
 713
 714     case _SC_SCHAR_MIN:
 715       return SCHAR_MIN;
 716
 717     case _SC_SHRT_MAX:
 718       return SHRT_MAX;
 719
 720     case _SC_SHRT_MIN:
 721       return SHRT_MIN;
 722
 723     case _SC_UCHAR_MAX:
 724       return UCHAR_MAX;
 725
 726     case _SC_UINT_MAX:
 727       return UINT_MAX;
 728
 729     case _SC_ULONG_MAX:
 730       return ULONG_MAX;
 731
 732     case _SC_USHRT_MAX:
 733       return USHRT_MAX;
 734
 735     case _SC_NL_ARGMAX:
 736 #ifdef  NL_ARGMAX
 737       return NL_ARGMAX;
 738 #else
 739       return -1;
 740 #endif
 741
 742     case _SC_NL_LANGMAX:
 743 #ifdef  NL_LANGMAX
 744       return NL_LANGMAX;
 745 #else
 746       return -1;
 747 #endif
 748
 749     case _SC_NL_MSGMAX:
 750 #ifdef  NL_MSGMAX
 751       return NL_MSGMAX;
 752 #else
 753       return -1;
 754 #endif
 755
 756     case _SC_NL_NMAX:
 757 #ifdef  NL_NMAX
 758       return NL_NMAX;
 759 #else
 760       return -1;
 761 #endif
 762
 763     case _SC_NL_SETMAX:
 764 #ifdef  NL_SETMAX
 765       return NL_SETMAX;
 766 #else
 767       return -1;
 768 #endif
 769
 770     case _SC_NL_TEXTMAX:
 771 #ifdef  NL_TEXTMAX
 772       return NL_TEXTMAX;
 773 #else
 774       return -1;
 775 #endif
 776
 777     case _SC_XBS5_ILP32_OFF32:
 778 #ifdef _XBS5_ILP32_OFF32
 779       return _XBS5_ILP32_OFF32;
 780 #else
 781       return -1;
 782 #endif
 783     case _SC_XBS5_ILP32_OFFBIG:
 784 #ifdef _XBS5_ILP32_OFFBIG
 785       return _XBS5_ILP32_OFFBIG;
 786 #else
 787       return -1;
 788 #endif
 789     case _SC_XBS5_LP64_OFF64:
 790 #ifdef _XBS5_LP64_OFF64
 791       return _XBS5_LP64_OFF64;
 792 #else
 793       return -1;
 794 #endif
 795     case _SC_XBS5_LPBIG_OFFBIG:
 796 #ifdef _XBS5_LPBIG_OFFBIG
 797       return _XBS5_LPBIG_OFFBIG;
 798 #else
 799       return -1;
 800 #endif
 801
 802     case _SC_V6_ILP32_OFF32:
 803 #ifdef _POSIX_V6_ILP32_OFF32
 804       return _POSIX_V6_ILP32_OFF32;
 805 #else
 806       return -1;
 807 #endif
 808     case _SC_V6_ILP32_OFFBIG:
 809 #ifdef _POSIX_V6_ILP32_OFFBIG
 810       return _POSIX_V6_ILP32_OFFBIG;
 811 #else
 812       return -1;
 813 #endif
 814     case _SC_V6_LP64_OFF64:
 815 #ifdef _POSIX_V6_LP64_OFF64
 816       return _POSIX_V6_LP64_OFF64;
 817 #else
 818       return -1;
 819 #endif
 820     case _SC_V6_LPBIG_OFFBIG:
 821 #ifdef _POSIX_V6_LPBIG_OFFBIG
 822       return _POSIX_V6_LPBIG_OFFBIG;
 823 #else
 824       return -1;
 825 #endif
 826
 827     case _SC_XOPEN_LEGACY:
 828       return _XOPEN_LEGACY;
 829
 830     case _SC_XOPEN_REALTIME:
 831 #ifdef _XOPEN_REALTIME
 832       return _XOPEN_REALTIME;
 833 #else
 834       return -1;
 835 #endif
 836     case _SC_XOPEN_REALTIME_THREADS:
 837 #ifdef _XOPEN_REALTIME_THREADS
 838       return _XOPEN_REALTIME_THREADS;
 839 #else
 840       return -1;
 841 #endif
 842
 843     case _SC_ADVISORY_INFO:
 844 #ifdef _POSIX_ADVISORY_INFO
 845       return _POSIX_ADVISORY_INFO;
 846 #else
 847       return -1;
 848 #endif
 849
 850     case _SC_BARRIERS:
 851 #ifdef _POSIX_BARRIERS
 852       return _POSIX_BARRIERS;
 853 #else
 854       return -1;
 855 #endif
 856
 857     case _SC_BASE:
 858 #ifdef _POSIX_BASE
 859       return _POSIX_BASE;
 860 #else
 861       return -1;
 862 #endif
 863     case _SC_C_LANG_SUPPORT:
 864 #ifdef _POSIX_C_LANG_SUPPORT
 865       return _POSIX_C_LANG_SUPPORT;
 866 #else
 867       return -1;
 868 #endif
 869     case _SC_C_LANG_SUPPORT_R:
 870 #ifdef _POSIX_C_LANG_SUPPORT_R
 871       return _POSIX_C_LANG_SUPPORT_R;
 872 #else
 873       return -1;
 874 #endif
 875
 876     case _SC_CLOCK_SELECTION:
 877 #ifdef _POSIX_CLOCK_SELECTION
 878       return _POSIX_CLOCK_SELECTION;
 879 #else
 880       return -1;
 881 #endif
 882
 883     case _SC_CPUTIME:
 884 #ifdef _POSIX_CPUTIME
 885       return _POSIX_CPUTIME;
 886 #else
 887       return -1;
 888 #endif
 889
 890     case _SC_DEVICE_IO:
 891 #ifdef _POSIX_DEVICE_IO
 892       return _POSIX_DEVICE_IO;
 893 #else
 894       return -1;
 895 #endif
 896     case _SC_DEVICE_SPECIFIC:
 897 #ifdef _POSIX_DEVICE_SPCIFIC
 898       return _POSIX_DEVICE_SPECIFIC;
 899 #else
 900       return -1;
 901 #endif
 902     case _SC_DEVICE_SPECIFIC_R:
 903 #ifdef _POSIX_DEVICE_SPCIFIC_R
 904       return _POSIX_DEVICE_SPECIFIC_R;
 905 #else
 906       return -1;
 907 #endif
 908
 909     case _SC_FD_MGMT:
 910 #ifdef _POSIX_FD_MGMT
 911       return _POSIX_FD_MGMT;
 912 #else
 913       return -1;
 914 #endif
 915
 916     case _SC_FIFO:
 917 #ifdef _POSIX_FIFO
 918       return _POSIX_FIFO;
 919 #else
 920       return -1;
 921 #endif
 922     case _SC_PIPE:
 923 #ifdef _POSIX_PIPE
 924       return _POSIX_PIPE;
 925 #else
 926       return -1;
 927 #endif
 928
 929     case _SC_FILE_ATTRIBUTES:
 930 #ifdef _POSIX_FILE_ATTRIBUTES
 931       return _POSIX_FILE_ATTRIBUTES;
 932 #else
 933       return -1;
 934 #endif
 935     case _SC_FILE_LOCKING:
 936 #ifdef _POSIX_FILE_LOCKING
 937       return _POSIX_FILE_LOCKING;
 938 #else
 939       return -1;
 940 #endif
 941     case _SC_FILE_SYSTEM:
 942 #ifdef _POSIX_FILE_SYSTEM
 943       return _POSIX_FILE_SYSTEM;
 944 #else
 945       return -1;
 946 #endif
 947
 948     case _SC_MONOTONIC_CLOCK:
 949 #ifdef _POSIX_MONOTONIC_CLOCK
 950       return _POSIX_MONOTONIC_CLOCK;
 951 #else
 952       return -1;
 953 #endif
 954
 955     case _SC_MULTI_PROCESS:
 956 #ifdef _POSIX_MULTI_PROCESS
 957       return _POSIX_MULTI_PROCESS;
 958 #else
 959       return -1;
 960 #endif
 961     case _SC_SINGLE_PROCESS:
 962 #ifdef _POSIX_SINGLE_PROCESS
 963       return _POSIX_SINGLE_PROCESS;
 964 #else
 965       return -1;
 966 #endif
 967
 968     case _SC_NETWORKING:
 969 #ifdef _POSIX_NETWORKING
 970       return _POSIX_NETWORKING;
 971 #else
 972       return -1;
 973 #endif
 974
 975     case _SC_READER_WRITER_LOCKS:
 976 #ifdef _POSIX_READER_WRITER_LOCKS
 977       return _POSIX_READER_WRITER_LOCKS;
 978 #else
 979       return -1;
 980 #endif
 981     case _SC_SPIN_LOCKS:
 982 #ifdef _POSIX_SPIN_LOCKS
 983       return _POSIX_SPIN_LOCKS;
 984 #else
 985       return -1;
 986 #endif
 987
 988     case _SC_REGEXP:
 989 #ifdef _POSIX_REGEXP
 990       return _POSIX_REGEXP;
 991 #else
 992       return -1;
 993 #endif
 994     case _SC_REGEX_VERSION:
 995 #ifdef _POSIX_REGEX_VERSION
 996       return _POSIX_REGEX_VERSION;
 997 #else
 998       return -1;
 999 #endif
1000
1001     case _SC_SHELL:
1002 #ifdef _POSIX_SHELL
1003       return _POSIX_SHELL;
1004 #else
1005       return -1;
1006 #endif
1007
1008     case _SC_SIGNALS:
1009 #ifdef _POSUX_SIGNALS
1010       return _POSIX_SIGNALS;
1011 #else
1012       return -1;
1013 #endif
1014
1015     case _SC_SPAWN:
1016 #ifdef _POSIX_SPAWN
1017       return _POSIX_SPAWN;
1018 #else
1019       return -1;
1020 #endif
1021
1022     case _SC_SPORADIC_SERVER:
1023 #ifdef _POSIX_SPORADIC_SERVER
1024       return _POSIX_SPORADIC_SERVER;
1025 #else
1026       return -1;
1027 #endif
1028     case _SC_THREAD_SPORADIC_SERVER:
1029 #ifdef _POSIX_THREAD_SPORADIC_SERVER
1030       return _POSIX_THREAD_SPORADIC_SERVER;
1031 #else
1032       return -1;
1033 #endif
1034
1035     case _SC_SYSTEM_DATABASE:
1036 #ifdef _POSIX_SYSTEM_DATABASE
1037       return _POSIX_SYSTEM_DATABASE;
1038 #else
1039       return -1;
1040 #endif
1041     case _SC_SYSTEM_DATABASE_R:
1042 #ifdef _POSIX_SYSTEM_DATABASE_R
1043       return _POSIX_SYSTEM_DATABASE_R;
1044 #else
1045       return -1;
1046 #endif
1047
1048     case _SC_THREAD_CPUTIME:
1049 #ifdef _POSIX_THREAD_CPUTIME
1050       return _POSIX_THREAD_CPUTIME;
1051 #else
1052       return -1;
1053 #endif
1054
1055     case _SC_TIMEOUTS:
1056 #ifdef _POSIX_TIMEOUTS
1057       return _POSIX_TIMEOUTS;
1058 #else
1059       return -1;
1060 #endif
1061
1062     case _SC_TYPED_MEMORY_OBJECTS:
1063 #ifdef _POSIX_TYPED_MEMORY_OBJECTS
1064       return _POSIX_TYPED_MEMORY_OBJECTS;
1065 #else
1066       return -1;
1067 #endif
1068
1069     case _SC_USER_GROUPS:
1070 #ifdef _POSIX_USER_GROUPS
1071       return _POSIX_USER_GROUPS;
1072 #else
1073       return -1;
1074 #endif
1075     case _SC_USER_GROUPS_R:
1076 #ifdef _POSIX_USER_GROUPS_R
1077       return _POSIX_USER_GROUPS_R;
1078 #else
1079       return -1;
1080 #endif
1081
1082     case _SC_2_PBS:
1083 #ifdef _POSIX2_PBS
1084       return _POSIX2_PBS;
1085 #else
1086       return -1;
1087 #endif
1088     case _SC_2_PBS_ACCOUNTING:
1089 #ifdef _POSIX2_PBS_ACCOUNTING
1090       return _POSIX2_PBS_ACCOUNTING;
1091 #else
1092       return -1;
1093 #endif
1094     case _SC_2_PBS_CHECKPOINT:
1095 #ifdef _POSIX2_PBS_CHECKPOINT
1096       return _POSIX2_PBS_CHECKPOINT;
1097 #else
1098       return -1;
1099 #endif
1100     case _SC_2_PBS_LOCATE:
1101 #ifdef _POSIX2_PBS_LOCATE
1102       return _POSIX2_PBS_LOCATE;
1103 #else
1104       return -1;
1105 #endif
1106     case _SC_2_PBS_TRACK:
1107 #ifdef _POSIX2_PBS_TRACK
1108       return _POSIX2_PBS_TRACK;
1109 #else
1110       return -1;
1111 #endif
1112
1113     case _SC_SYMLOOP_MAX:
1114 #ifdef SYMLOOP_MAX
1115       return SYMLOOP_MAX;
1116 #else
1117       return -1;
1118 #endif
1119
1120     case _SC_STREAMS:
1121 #ifdef _XOPEN_STREAMS
1122       return _XOPEN_STREAMS;
1123 #else
1124       return -1;
1125 #endif
1126     }
1127 }
1128
1129 #undef __sysconf
1130 weak_alias (__sysconf, sysconf)