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 Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 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/sysinfo.h>
  28 #include <sys/types.h>
  29 #include <regex.h>
  30
  31
  32 /* Get the value of the system variable NAME.  */
  33 long int
  34 __sysconf (name)
  35      int name;
  36 {
  37   switch (name)
  38     {
  39     default:
  40       __set_errno (EINVAL);
  41       return -1;
  42
  43     case _SC_ARG_MAX:
  44 #ifdef  ARG_MAX
  45       return ARG_MAX;
  46 #else
  47       return -1;
  48 #endif
  49
  50     case _SC_CHILD_MAX:
  51 #ifdef  CHILD_MAX
  52       return CHILD_MAX;
  53 #else
  54       return -1;
  55 #endif
  56
  57     case _SC_CLK_TCK:
  58       return __getclktck ();
  59
  60     case _SC_NGROUPS_MAX:
  61 #ifdef  NGROUPS_MAX
  62       return NGROUPS_MAX;
  63 #else
  64       return -1;
  65 #endif
  66
  67     case _SC_OPEN_MAX:
  68       return __getdtablesize ();
  69
  70     case _SC_STREAM_MAX:
  71 #ifdef  STREAM_MAX
  72       return STREAM_MAX;
  73 #else
  74       return FOPEN_MAX;
  75 #endif
  76
  77     case _SC_TZNAME_MAX:
  78       return __tzname_max ();
  79
  80     case _SC_JOB_CONTROL:
  81 #ifdef  _POSIX_JOB_CONTROL
  82       return 1;
  83 #else
  84       return -1;
  85 #endif
  86
  87     case _SC_SAVED_IDS:
  88 #ifdef  _POSIX_SAVED_IDS
  89       return 1;
  90 #else
  91       return -1;
  92 #endif
  93
  94     case _SC_REALTIME_SIGNALS:
  95 #ifdef  _POSIX_REALTIME_SIGNALS
  96       return 1;
  97 #else
  98       return -1;
  99 #endif
 100
 101     case _SC_PRIORITY_SCHEDULING:
 102 #ifdef  _POSIX_PRIORITY_SCHEDULING
 103       return 1;
 104 #else
 105       return -1;
 106 #endif
 107
 108     case _SC_TIMERS:
 109 #ifdef  _POSIX_TIMERS
 110       return 1;
 111 #else
 112       return -1;
 113 #endif
 114
 115     case _SC_ASYNCHRONOUS_IO:
 116 #ifdef  _POSIX_ASYNCHRONOUS_IO
 117       return 1;
 118 #else
 119       return -1;
 120 #endif
 121
 122     case _SC_PRIORITIZED_IO:
 123 #ifdef  _POSIX_PRIORITIZED_IO
 124       return 1;
 125 #else
 126       return -1;
 127 #endif
 128
 129     case _SC_SYNCHRONIZED_IO:
 130 #ifdef  _POSIX_SYNCHRONIZED_IO
 131       return 1;
 132 #else
 133       return -1;
 134 #endif
 135
 136     case _SC_FSYNC:
 137 #ifdef  _POSIX_FSYNC
 138       return 1;
 139 #else
 140       return -1;
 141 #endif
 142
 143     case _SC_MAPPED_FILES:
 144 #ifdef  _POSIX_MAPPED_FILES
 145       return 1;
 146 #else
 147       return -1;
 148 #endif
 149
 150     case _SC_MEMLOCK:
 151 #ifdef  _POSIX_MEMLOCK
 152       return 1;
 153 #else
 154       return -1;
 155 #endif
 156
 157     case _SC_MEMLOCK_RANGE:
 158 #ifdef  _POSIX_MEMLOCK_RANGE
 159       return 1;
 160 #else
 161       return -1;
 162 #endif
 163
 164     case _SC_MEMORY_PROTECTION:
 165 #ifdef  _POSIX_MEMORY_PROTECTION
 166       return 1;
 167 #else
 168       return -1;
 169 #endif
 170
 171     case _SC_MESSAGE_PASSING:
 172 #ifdef  _POSIX_MESSAGE_PASSING
 173       return 1;
 174 #else
 175       return -1;
 176 #endif
 177
 178     case _SC_SEMAPHORES:
 179 #ifdef  _POSIX_SEMAPHORES
 180       return 1;
 181 #else
 182       return -1;
 183 #endif
 184
 185     case _SC_SHARED_MEMORY_OBJECTS:
 186 #ifdef  _POSIX_SHARED_MEMORY_OBJECTS
 187       return 1;
 188 #else
 189       return -1;
 190 #endif
 191
 192     case _SC_VERSION:
 193       return _POSIX_VERSION;
 194
 195     case _SC_PAGESIZE:
 196       return __getpagesize ();
 197
 198     case _SC_AIO_LISTIO_MAX:
 199 #ifdef  AIO_LISTIO_MAX
 200       return AIO_LISTIO_MAX;
 201 #else
 202       return -1;
 203 #endif
 204
 205     case _SC_AIO_MAX:
 206 #ifdef  AIO_MAX
 207       return AIO_MAX;
 208 #else
 209       return -1;
 210 #endif
 211
 212     case _SC_AIO_PRIO_DELTA_MAX:
 213 #ifdef  AIO_PRIO_DELTA_MAX
 214       return AIO_PRIO_DELTA_MAX;
 215 #else
 216       return -1;
 217 #endif
 218
 219     case _SC_DELAYTIMER_MAX:
 220 #ifdef  DELAYTIMER_MAX
 221       return DELAYTIMER_MAX;
 222 #else
 223       return -1;
 224 #endif
 225
 226     case _SC_MQ_OPEN_MAX:
 227 #ifdef  MQ_OPEN_MAX
 228       return MQ_OPEN_MAX;
 229 #else
 230       return -1;
 231 #endif
 232
 233     case _SC_MQ_PRIO_MAX:
 234 #ifdef  MQ_PRIO_MAX
 235       return MQ_PRIO_MAX;
 236 #else
 237       return -1;
 238 #endif
 239
 240     case _SC_RTSIG_MAX:
 241 #ifdef  RTSIG_MAX
 242       return RTSIG_MAX;
 243 #else
 244       return -1;
 245 #endif
 246
 247     case _SC_SEM_NSEMS_MAX:
 248 #ifdef  SEM_NSEMS_MAX
 249       return SEM_NSEMS_MAX;
 250 #else
 251       return -1;
 252 #endif
 253
 254     case _SC_SEM_VALUE_MAX:
 255 #ifdef  SEM_VALUE_MAX
 256       return SEM_VALUE_MAX;
 257 #else
 258       return -1;
 259 #endif
 260
 261     case _SC_SIGQUEUE_MAX:
 262 #ifdef  SIGQUEUE_MAX
 263       return SIGQUEUE_MAX;
 264 #else
 265       return -1;
 266 #endif
 267
 268     case _SC_TIMER_MAX:
 269 #ifdef  TIMER_MAX
 270       return TIMER_MAX;
 271 #else
 272       return -1;
 273 #endif
 274
 275     case _SC_BC_BASE_MAX:
 276 #ifdef  BC_BASE_MAX
 277       return BC_BASE_MAX;
 278 #else
 279       return -1;
 280 #endif
 281
 282     case _SC_BC_DIM_MAX:
 283 #ifdef  BC_DIM_MAX
 284       return BC_DIM_MAX;
 285 #else
 286       return -1;
 287 #endif
 288
 289     case _SC_BC_SCALE_MAX:
 290 #ifdef  BC_SCALE_MAX
 291       return BC_SCALE_MAX;
 292 #else
 293       return -1;
 294 #endif
 295
 296     case _SC_BC_STRING_MAX:
 297 #ifdef  BC_STRING_MAX
 298       return BC_STRING_MAX;
 299 #else
 300       return -1;
 301 #endif
 302
 303     case _SC_COLL_WEIGHTS_MAX:
 304 #ifdef  COLL_WEIGHTS_MAX
 305       return COLL_WEIGHTS_MAX;
 306 #else
 307       return -1;
 308 #endif
 309
 310     case _SC_EXPR_NEST_MAX:
 311 #ifdef  EXPR_NEST_MAX
 312       return EXPR_NEST_MAX;
 313 #else
 314       return -1;
 315 #endif
 316
 317     case _SC_LINE_MAX:
 318 #ifdef  LINE_MAX
 319       return LINE_MAX;
 320 #else
 321       return -1;
 322 #endif
 323
 324     case _SC_RE_DUP_MAX:
 325 #ifdef  RE_DUP_MAX
 326       return RE_DUP_MAX;
 327 #else
 328       return -1;
 329 #endif
 330
 331     case _SC_CHARCLASS_NAME_MAX:
 332 #ifdef  CHARCLASS_NAME_MAX
 333       return CHARCLASS_NAME_MAX;
 334 #else
 335       return -1;
 336 #endif
 337
 338     case _SC_PII:
 339 #ifdef  _POSIX_PII
 340       return 1;
 341 #else
 342       return -1;
 343 #endif
 344
 345     case _SC_PII_XTI:
 346 #ifdef  _POSIX_PII_XTI
 347       return 1;
 348 #else
 349       return -1;
 350 #endif
 351
 352     case _SC_PII_SOCKET:
 353 #ifdef  _POSIX_PII_SOCKET
 354       return 1;
 355 #else
 356       return -1;
 357 #endif
 358
 359     case _SC_PII_INTERNET:
 360 #ifdef  _POSIX_PII_INTERNET
 361       return 1;
 362 #else
 363       return -1;
 364 #endif
 365
 366     case _SC_PII_OSI:
 367 #ifdef  _POSIX_PII_OSI
 368       return 1;
 369 #else
 370       return -1;
 371 #endif
 372
 373     case _SC_POLL:
 374 #ifdef  _POSIX_POLL
 375       return 1;
 376 #else
 377       return -1;
 378 #endif
 379
 380     case _SC_SELECT:
 381 #ifdef  _POSIX_SELECT
 382       return 1;
 383 #else
 384       return -1;
 385 #endif
 386
 387     case _SC_UIO_MAXIOV:
 388 #ifdef  UIO_MAXIOV
 389       return UIO_MAXIOV;
 390 #else
 391       return -1;
 392 #endif
 393
 394     case _SC_PII_INTERNET_STREAM:
 395 #ifdef  _POSIX_PII_INTERNET_STREAM
 396       return 1;
 397 #else
 398       return -1;
 399 #endif
 400
 401     case _SC_PII_INTERNET_DGRAM:
 402 #ifdef  _POSIX_PII_INTERNET_DGRAM
 403       return 1;
 404 #else
 405       return -1;
 406 #endif
 407
 408     case _SC_PII_OSI_COTS:
 409 #ifdef  _POSIX_PII_OSI_COTS
 410       return 1;
 411 #else
 412       return -1;
 413 #endif
 414
 415     case _SC_PII_OSI_CLTS:
 416 #ifdef  _POSIX_PII_OSI_CLTS
 417       return 1;
 418 #else
 419       return -1;
 420 #endif
 421
 422     case _SC_PII_OSI_M:
 423 #ifdef  _POSIX_PII_OSI_M
 424       return 1;
 425 #else
 426       return -1;
 427 #endif
 428
 429     case _SC_T_IOV_MAX:
 430 #ifdef  _T_IOV_MAX
 431       return _T_IOV_MAX;
 432 #else
 433       return -1;
 434 #endif
 435
 436     case _SC_2_VERSION:
 437       return _POSIX2_VERSION;
 438
 439     case _SC_2_C_BIND:
 440 #ifdef  _POSIX2_C_BIND
 441       return _POSIX2_C_BIND;
 442 #else
 443       return -1;
 444 #endif
 445
 446     case _SC_2_C_DEV:
 447 #ifdef  _POSIX2_C_DEV
 448       return _POSIX2_C_DEV;
 449 #else
 450       return -1;
 451 #endif
 452
 453     case _SC_2_C_VERSION:
 454 #ifdef  _POSIX2_C_VERSION
 455       return _POSIX2_C_VERSION;
 456 #else
 457       return -1;
 458 #endif
 459
 460     case _SC_2_FORT_DEV:
 461 #ifdef  _POSIX2_FORT_DEV
 462       return _POSIX2_FORT_DEV;
 463 #else
 464       return -1;
 465 #endif
 466
 467     case _SC_2_LOCALEDEF:
 468 #ifdef  _POSIX2_LOCALEDEF
 469       return _POSIX2_LOCALEDEF;
 470 #else
 471       return -1;
 472 #endif
 473
 474     case _SC_2_SW_DEV:
 475 #ifdef  _POSIX2_SW_DEV
 476       return _POSIX2_SW_DEV;
 477 #else
 478       return -1;
 479 #endif
 480
 481     case _SC_2_CHAR_TERM:
 482 #ifdef  _POSIX2_CHAR_TERM
 483       return _POSIX2_CHAR_TERM;
 484 #else
 485       return -1;
 486 #endif
 487
 488     case _SC_2_UPE:
 489 #ifdef  _POSIX2_UPE
 490       return _POSIX2_UPE;
 491 #else
 492       return -1;
 493 #endif
 494
 495       /* POSIX 1003.1c (POSIX Threads).  */
 496     case _SC_THREADS:
 497 #ifdef  _POSIX_THREADS
 498       return 1;
 499 #else
 500       return -1;
 501 #endif
 502
 503     case _SC_THREAD_SAFE_FUNCTIONS:
 504 #ifdef  _POSIX_THREAD_SAFE_FUNCTIONS
 505       return 1;
 506 #else
 507       return -1;
 508 #endif
 509
 510     case _SC_GETGR_R_SIZE_MAX:
 511 #ifdef  NSS_BUFLEN_GROUP
 512       return NSS_BUFLEN_GROUP;
 513 #else
 514       return -1;
 515 #endif
 516
 517     case _SC_GETPW_R_SIZE_MAX:
 518 #ifdef  NSS_BUFLEN_PASSWD
 519       return NSS_BUFLEN_PASSWD;
 520 #else
 521       return -1;
 522 #endif
 523
 524     case _SC_LOGIN_NAME_MAX:
 525 #ifdef  _POSIX_LOGIN_NAME_MAX
 526       return _POSIX_LOGIN_NAME_MAX;
 527 #else
 528       return -1;
 529 #endif
 530
 531     case _SC_TTY_NAME_MAX:
 532 #ifdef  _POSIX_TTY_NAME_MAX
 533       return _POSIX_TTY_NAME_MAX;
 534 #else
 535       return -1;
 536 #endif
 537
 538     case _SC_THREAD_DESTRUCTOR_ITERATIONS:
 539 #ifdef  _POSIX_THREAD_DESTRUCTOR_ITERATIONS
 540       return _POSIX_THREAD_DESTRUCTOR_ITERATIONS;
 541 #else
 542       return -1;
 543 #endif
 544
 545     case _SC_THREAD_KEYS_MAX:
 546 #ifdef  PTHREAD_KEYS_MAX
 547       return PTHREAD_KEYS_MAX;
 548 #else
 549       return -1;
 550 #endif
 551
 552     case _SC_THREAD_STACK_MIN:
 553 #ifdef  PTHREAD_STACK_MIN
 554       return PTHREAD_STACK_MIN;
 555 #else
 556       return -1;
 557 #endif
 558
 559     case _SC_THREAD_THREADS_MAX:
 560 #ifdef  PTHREAD_THREADS_MAX
 561       return PTHREAD_THREADS_MAX;
 562 #else
 563       return -1;
 564 #endif
 565
 566     case _SC_THREAD_ATTR_STACKADDR:
 567 #ifdef  _POSIX_THREAD_ATTR_STACKADDR
 568       return 1;
 569 #else
 570       return -1;
 571 #endif
 572
 573     case _SC_THREAD_ATTR_STACKSIZE:
 574 #ifdef  _POSIX_THREAD_ATTR_STACKSIZE
 575       return 1;
 576 #else
 577       return -1;
 578 #endif
 579
 580     case _SC_THREAD_PRIORITY_SCHEDULING:
 581 #ifdef  _POSIX_THREAD_PRIORITY_SCHEDULING
 582       return 1;
 583 #else
 584       return -1;
 585 #endif
 586
 587     case _SC_THREAD_PRIO_INHERIT:
 588 #ifdef  _POSIX_THREAD_PRIO_INHERIT
 589       return 1;
 590 #else
 591       return -1;
 592 #endif
 593
 594     case _SC_THREAD_PRIO_PROTECT:
 595 #ifdef  _POSIX_THREAD_PRIO_PROTECT
 596       return 1;
 597 #else
 598       return -1;
 599 #endif
 600
 601     case _SC_THREAD_PROCESS_SHARED:
 602 #ifdef  _POSIX_THREAD_PROCESS_SHARED
 603       return 1;
 604 #else
 605       return -1;
 606 #endif
 607
 608     case _SC_NPROCESSORS_CONF:
 609       return __get_nprocs_conf ();
 610
 611     case _SC_NPROCESSORS_ONLN:
 612       return __get_nprocs ();
 613
 614     case _SC_PHYS_PAGES:
 615       return __get_phys_pages ();
 616
 617     case _SC_AVPHYS_PAGES:
 618       return __get_avphys_pages ();
 619
 620     case _SC_ATEXIT_MAX:
 621       /* We have no limit since we use lists.  */
 622       return INT_MAX;
 623
 624     case _SC_PASS_MAX:
 625       /* We have no limit but since the return value might be used to
 626          allocate a buffer we restrict the value.  */
 627       return BUFSIZ;
 628
 629     case _SC_XOPEN_VERSION:
 630       return _XOPEN_VERSION;
 631
 632     case _SC_XOPEN_XCU_VERSION:
 633       return _XOPEN_XCU_VERSION;
 634
 635     case _SC_XOPEN_UNIX:
 636       return _XOPEN_UNIX;
 637
 638     case _SC_XOPEN_CRYPT:
 639 #ifdef  _XOPEN_CRYPT
 640       return _XOPEN_CRYPT;
 641 #else
 642       return -1;
 643 #endif
 644
 645     case _SC_XOPEN_ENH_I18N:
 646 #ifdef  _XOPEN_ENH_I18N
 647       return _XOPEN_ENH_I18N;
 648 #else
 649       return -1;
 650 #endif
 651
 652     case _SC_XOPEN_SHM:
 653 #ifdef  _XOPEN_SHM
 654       return _XOPEN_SHM;
 655 #else
 656       return -1;
 657 #endif
 658
 659     case _SC_XOPEN_XPG2:
 660 #ifdef  _XOPEN_XPG2
 661       return _XOPEN_XPG2;
 662 #else
 663       return -1;
 664 #endif
 665
 666     case _SC_XOPEN_XPG3:
 667 #ifdef  _XOPEN_XPG3
 668       return _XOPEN_XPG3;
 669 #else
 670       return -1;
 671 #endif
 672
 673     case _SC_XOPEN_XPG4:
 674 #ifdef  _XOPEN_XPG4
 675       return _XOPEN_XPG4;
 676 #else
 677       return -1;
 678 #endif
 679
 680     case _SC_CHAR_BIT:
 681       return CHAR_BIT;
 682
 683     case _SC_CHAR_MAX:
 684       return CHAR_MAX;
 685
 686     case _SC_CHAR_MIN:
 687       return CHAR_MIN;
 688
 689     case _SC_INT_MAX:
 690       return INT_MAX;
 691
 692     case _SC_INT_MIN:
 693       return INT_MIN;
 694
 695     case _SC_LONG_BIT:
 696       return sizeof (long int) * CHAR_BIT;
 697
 698     case _SC_WORD_BIT:
 699       return sizeof (int) * CHAR_BIT;
 700
 701     case _SC_MB_LEN_MAX:
 702       return MB_LEN_MAX;
 703
 704     case _SC_NZERO:
 705       return NZERO;
 706
 707     case _SC_SSIZE_MAX:
 708       return _POSIX_SSIZE_MAX;
 709
 710     case _SC_SCHAR_MAX:
 711       return SCHAR_MAX;
 712
 713     case _SC_SCHAR_MIN:
 714       return SCHAR_MIN;
 715
 716     case _SC_SHRT_MAX:
 717       return SHRT_MAX;
 718
 719     case _SC_SHRT_MIN:
 720       return SHRT_MIN;
 721
 722     case _SC_UCHAR_MAX:
 723       return UCHAR_MAX;
 724
 725     case _SC_UINT_MAX:
 726       return UINT_MAX;
 727
 728     case _SC_ULONG_MAX:
 729       return ULONG_MAX;
 730
 731     case _SC_USHRT_MAX:
 732       return USHRT_MAX;
 733
 734     case _SC_NL_ARGMAX:
 735 #ifdef  NL_ARGMAX
 736       return NL_ARGMAX;
 737 #else
 738       return -1;
 739 #endif
 740
 741     case _SC_NL_LANGMAX:
 742 #ifdef  NL_LANGMAX
 743       return NL_LANGMAX;
 744 #else
 745       return -1;
 746 #endif
 747
 748     case _SC_NL_MSGMAX:
 749 #ifdef  NL_MSGMAX
 750       return NL_MSGMAX;
 751 #else
 752       return -1;
 753 #endif
 754
 755     case _SC_NL_NMAX:
 756 #ifdef  NL_NMAX
 757       return NL_NMAX;
 758 #else
 759       return -1;
 760 #endif
 761
 762     case _SC_NL_SETMAX:
 763 #ifdef  NL_SETMAX
 764       return NL_SETMAX;
 765 #else
 766       return -1;
 767 #endif
 768
 769     case _SC_NL_TEXTMAX:
 770 #ifdef  NL_TEXTMAX
 771       return NL_TEXTMAX;
 772 #else
 773       return -1;
 774 #endif
 775
 776     case _SC_XBS5_ILP32_OFF32:
 777 #ifdef _XBS5_ILP32_OFF32
 778       return _XBS5_ILP32_OFF32;
 779 #else
 780       return -1;
 781 #endif
 782     case _SC_XBS5_ILP32_OFFBIG:
 783 #ifdef _XBS5_ILP32_OFFBIG
 784       return _XBS5_ILP32_OFFBIG;
 785 #else
 786       return -1;
 787 #endif
 788     case _SC_XBS5_LP64_OFF64:
 789 #ifdef _XBS5_LP64_OFF64
 790       return _XBS5_LP64_OFF64;
 791 #else
 792       return -1;
 793 #endif
 794     case _SC_XBS5_LPBIG_OFFBIG:
 795 #ifdef _XBS5_LPBIG_OFFBIG
 796       return _XBS5_LPBIG_OFFBIG;
 797 #else
 798       return -1;
 799 #endif
 800
 801     case _SC_XOPEN_LEGACY:
 802       return _XOPEN_LEGACY;
 803
 804     case _SC_XOPEN_REALTIME:
 805 #ifdef _XOPEN_REALTIME
 806       return _XOPEN_REALTIME;
 807 #else
 808       return -1;
 809 #endif
 810     case _SC_XOPEN_REALTIME_THREADS:
 811 #ifdef _XOPEN_REALTIME_THREADS
 812       return _XOPEN_REALTIME_THREADS;
 813 #else
 814       return -1;
 815 #endif
 816
 817     case _SC_ADVISORY_INFO:
 818 #ifdef _POSIX_ADVISORY_INFO
 819       return _POSIX_ADVISORY_INFO;
 820 #else
 821       return -1;
 822 #endif
 823
 824     case _SC_BARRIERS:
 825 #ifdef _POSIX_BARRIERS
 826       return _POSIX_BARRIERS;
 827 #else
 828       return -1;
 829 #endif
 830
 831     case _SC_BASE:
 832 #ifdef _POSIX_BASE
 833       return _POSIX_BASE;
 834 #else
 835       return -1;
 836 #endif
 837     case _SC_C_LANG_SUPPORT:
 838 #ifdef _POSIX_C_LANG_SUPPORT
 839       return _POSIX_C_LANG_SUPPORT;
 840 #else
 841       return -1;
 842 #endif
 843     case _SC_C_LANG_SUPPORT_R:
 844 #ifdef _POSIX_C_LANG_SUPPORT_R
 845       return _POSIX_C_LANG_SUPPORT_R;
 846 #else
 847       return -1;
 848 #endif
 849
 850     case _SC_CLOCK_SELECTION:
 851 #ifdef _POSIX_CLOCK_SELECTION
 852       return _POSIX_CLOCK_SELECTION;
 853 #else
 854       return -1;
 855 #endif
 856
 857     case _SC_CPUTIME:
 858 #ifdef _POSIX_CPUTIME
 859       return _POSIX_CPUTIME;
 860 #else
 861       return -1;
 862 #endif
 863
 864     case _SC_DEVICE_IO:
 865 #ifdef _POSIX_DEVICE_IO
 866       return _POSIX_DEVICE_IO;
 867 #else
 868       return -1;
 869 #endif
 870     case _SC_DEVICE_SPECIFIC:
 871 #ifdef _POSIX_DEVICE_SPCIFIC
 872       return _POSIX_DEVICE_SPECIFIC;
 873 #else
 874       return -1;
 875 #endif
 876     case _SC_DEVICE_SPECIFIC_R:
 877 #ifdef _POSIX_DEVICE_SPCIFIC_R
 878       return _POSIX_DEVICE_SPECIFIC_R;
 879 #else
 880       return -1;
 881 #endif
 882
 883     case _SC_FD_MGMT:
 884 #ifdef _POSIX_FD_MGMT
 885       return _POSIX_FD_MGMT;
 886 #else
 887       return -1;
 888 #endif
 889
 890     case _SC_FIFO:
 891 #ifdef _POSIX_FIFO
 892       return _POSIX_FIFO;
 893 #else
 894       return -1;
 895 #endif
 896     case _SC_PIPE:
 897 #ifdef _POSIX_PIPE
 898       return _POSIX_PIPE;
 899 #else
 900       return -1;
 901 #endif
 902
 903     case _SC_FILE_ATTRIBUTES:
 904 #ifdef _POSIX_FILE_ATTRIBUTES
 905       return _POSIX_FILE_ATTRIBUTES;
 906 #else
 907       return -1;
 908 #endif
 909     case _SC_FILE_LOCKING:
 910 #ifdef _POSIX_FILE_LOCKING
 911       return _POSIX_FILE_LOCKING;
 912 #else
 913       return -1;
 914 #endif
 915     case _SC_FILE_SYSTEM:
 916 #ifdef _POSIX_FILE_SYSTEM
 917       return _POSIX_FILE_SYSTEM;
 918 #else
 919       return -1;
 920 #endif
 921
 922     case _SC_MONOTONIC_CLOCK:
 923 #ifdef _POSIX_MONOTONIC_CLOCK
 924       return _POSIX_MONOTONIC_CLOCK;
 925 #else
 926       return -1;
 927 #endif
 928
 929     case _SC_MULTIPLE_PROCESS:
 930 #ifdef _POSIX_MULTIPLE_PROCESS
 931       return _POSIX_MULTIPLE_PROCESS;
 932 #else
 933       return -1;
 934 #endif
 935     case _SC_SINGLE_PROCESS:
 936 #ifdef _POSIX_SINGLE_PROCESS
 937       return _POSIX_SINGLE_PROCESS;
 938 #else
 939       return -1;
 940 #endif
 941
 942     case _SC_NETWORKING:
 943 #ifdef _POSIX_NETWORKING
 944       return _POSIX_NETWORKING;
 945 #else
 946       return -1;
 947 #endif
 948
 949     case _SC_READER_WRITER_LOCKS:
 950 #ifdef _POSIX_READER_WRITER_LOCKS
 951       return _POSIX_READER_WRITER_LOCKS;
 952 #else
 953       return -1;
 954 #endif
 955     case _SC_SPIN_LOCKS:
 956 #ifdef _POSIX_SPIN_LOCKS
 957       return _POSIX_SPIN_LOCKS;
 958 #else
 959       return -1;
 960 #endif
 961
 962     case _SC_REGEXP:
 963 #ifdef _POSIX_REGEXP
 964       return _POSIX_REGEXP;
 965 #else
 966       return -1;
 967 #endif
 968     case _SC_REGEX_VERSION:
 969 #ifdef _POSIX_REGEX_VERSION
 970       return _POSIX_REGEX_VERSION;
 971 #else
 972       return -1;
 973 #endif
 974
 975     case _SC_SHELL:
 976 #ifdef _POSIX_SHELL
 977       return _POSIX_SHELL;
 978 #else
 979       return -1;
 980 #endif
 981
 982     case _SC_SIGNALS:
 983 #ifdef _POSUX_SIGNALS
 984       return _POSIX_SIGNALS;
 985 #else
 986       return -1;
 987 #endif
 988
 989     case _SC_SPAWN:
 990 #ifdef _POSIX_SPAWN
 991       return _POSIX_SPAWN;
 992 #else
 993       return -1;
 994 #endif
 995
 996     case _SC_SPORADIC_SERVER:
 997 #ifdef _POSIX_SPORADIC_SERVER
 998       return _POSIX_SPORADIC_SERVER;
 999 #else
1000       return -1;
1001 #endif
1002     case _SC_THREAD_SPORADIC_SERVER:
1003 #ifdef _POSIX_THREAD_SPORADIC_SERVER
1004       return _POSIX_THREAD_SPORADIC_SERVER;
1005 #else
1006       return -1;
1007 #endif
1008
1009     case _SC_SYSTEM_DATABASE:
1010 #ifdef _POSIX_SYSTEM_DATABASE
1011       return _POSIX_SYSTEM_DATABASE;
1012 #else
1013       return -1;
1014 #endif
1015     case _SC_SYSTEM_DATABASE_R:
1016 #ifdef _POSIX_SYSTEM_DATABASE_R
1017       return _POSIX_SYSTEM_DATABASE_R;
1018 #else
1019       return -1;
1020 #endif
1021
1022     case _SC_THREAD_CPUTIME:
1023 #ifdef _POSIX_THREAD_CPUTIME
1024       return _POSIX_THREAD_CPUTIME;
1025 #else
1026       return -1;
1027 #endif
1028
1029     case _SC_TIMEOUTS:
1030 #ifdef _POSIX_TIMEOUTS
1031       return _POSIX_TIMEOUTS;
1032 #else
1033       return -1;
1034 #endif
1035
1036     case _SC_TYPED_MEMORY_OBJECTS:
1037 #ifdef _POSIX_TYPED_MEMORY_OBJECTS
1038       return _POSIX_TYPED_MEMORY_OBJECTS;
1039 #else
1040       return -1;
1041 #endif
1042
1043     case _SC_USER_GROUPS:
1044 #ifdef _POSIX_USER_GROUPS
1045       return _POSIX_USER_GROUPS;
1046 #else
1047       return -1;
1048 #endif
1049     case _SC_USER_GROUPS_R:
1050 #ifdef _POSIX_USER_GROUPS_R
1051       return _POSIX_USER_GROUPS_R;
1052 #else
1053       return -1;
1054 #endif
1055
1056     case _SC_2_PBS:
1057 #ifdef _POSIX2_PBS
1058       return _POSIX2_PBS;
1059 #else
1060       return -1;
1061 #endif
1062     case _SC_2_PBS_ACCOUNTING:
1063 #ifdef _POSIX2_PBS_ACCOUNTING
1064       return _POSIX2_PBS_ACCOUNTING;
1065 #else
1066       return -1;
1067 #endif
1068     case _SC_2_PBS_CHECKPOINT:
1069 #ifdef _POSIX2_PBS_CHECKPOINT
1070       return _POSIX2_PBS_CHECKPOINT;
1071 #else
1072       return -1;
1073 #endif
1074     case _SC_2_PBS_LOCATE:
1075 #ifdef _POSIX2_PBS_LOCATE
1076       return _POSIX2_PBS_LOCATE;
1077 #else
1078       return -1;
1079 #endif
1080     case _SC_2_PBS_TRACK:
1081 #ifdef _POSIX2_PBS_TRACK
1082       return _POSIX2_PBS_TRACK;
1083 #else
1084       return -1;
1085 #endif
1086
1087     case _SC_SYMLOOP:
1088 #ifdef SYMLOOP_MAX
1089       return SYMLOOP_MAX;
1090 #else
1091       return -1;
1092 #endif
1093
1094     case _SC_STREAMS:
1095 #ifdef _XOPEN_STREAMS
1096       return _XOPEN_STREAMS;
1097 #else
1098       return -1;
1099 #endif
1100     }
1101 }
1102
1103 #undef __sysconf
1104 weak_alias (__sysconf, sysconf)