sysdeps/posix/sysconf.c

   1 /* Copyright (C) 1991-2024 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, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <limits.h>
  20 #include <grp.h>
  21 #include <pwd.h>
  22 #include <stddef.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <time.h>
  27 #include <unistd.h>
  28 #include <sys/param.h>
  29 #include <sys/stat.h>
  30 #include <sys/sysinfo.h>
  31 #include <sys/types.h>
  32 #include <sys/uio.h>
  33 #include <regex.h>
  34 #include <signal.h>
  35 #include <sysconf-pthread_stack_min.h>
  36
  37 #define NEED_SPEC_ARRAY 0
  38 #include <posix-conf-vars.h>
  39
  40 #if !defined _XBS5_ILP32_OFF32 || !defined _XBS5_ILP32_OFFBIG \
  41    || !defined _XBS5_LP64_OFF64 || !defined _XBS5_LPBIG_OFFBIG \
  42    || !defined _POSIX_V6_ILP32_OFF32 || !defined _POSIX_V6_ILP32_OFFBIG \
  43    || !defined _POSIX_V6_LP64_OFF64 || !defined _POSIX_V6_LPBIG_OFFBIG \
  44    || !defined _POSIX_V7_ILP32_OFF32 || !defined _POSIX_V7_ILP32_OFFBIG \
  45    || !defined _POSIX_V7_LP64_OFF64 || !defined _POSIX_V7_LPBIG_OFFBIG
  46 # define NEED_CHECK_SPEC 1
  47 #else
  48 # define NEED_CHECK_SPEC 0
  49 #endif
  50
  51 #if NEED_CHECK_SPEC
  52 static long int __sysconf_check_spec (const char *spec);
  53 #endif
  54
  55
  56 /* Get the value of the system variable NAME.  */
  57 long int
  58 __sysconf (int name)
  59 {
  60   switch (name)
  61     {
  62       /* Also add obsolete or unnecessarily added constants here.  */
  63     case _SC_EQUIV_CLASS_MAX:
  64     default:
  65       __set_errno (EINVAL);
  66       return -1;
  67
  68     case _SC_ARG_MAX:
  69 #ifdef  ARG_MAX
  70       return ARG_MAX;
  71 #else
  72       return -1;
  73 #endif
  74
  75     case _SC_CHILD_MAX:
  76 #ifdef  CHILD_MAX
  77       return CHILD_MAX;
  78 #else
  79       return __get_child_max ();
  80 #endif
  81
  82     case _SC_CLK_TCK:
  83       return __getclktck ();
  84
  85     case _SC_NGROUPS_MAX:
  86 #ifdef  NGROUPS_MAX
  87       return NGROUPS_MAX;
  88 #else
  89       return -1;
  90 #endif
  91
  92     case _SC_OPEN_MAX:
  93       return __getdtablesize ();
  94
  95     case _SC_STREAM_MAX:
  96 #ifdef  STREAM_MAX
  97       return STREAM_MAX;
  98 #else
  99       return FOPEN_MAX;
 100 #endif
 101
 102     case _SC_TZNAME_MAX:
 103       return -1;
 104
 105     case _SC_JOB_CONTROL:
 106 #if CONF_IS_DEFINED_SET (_POSIX_JOB_CONTROL)
 107       return _POSIX_JOB_CONTROL;
 108 #else
 109       return -1;
 110 #endif
 111
 112     case _SC_SAVED_IDS:
 113 #if CONF_IS_DEFINED_SET (_POSIX_SAVED_IDS)
 114       return 1;
 115 #else
 116       return -1;
 117 #endif
 118
 119     case _SC_REALTIME_SIGNALS:
 120 #if CONF_IS_DEFINED_SET (_POSIX_REALTIME_SIGNALS)
 121       return _POSIX_REALTIME_SIGNALS;
 122 #else
 123       return -1;
 124 #endif
 125
 126     case _SC_PRIORITY_SCHEDULING:
 127 #if CONF_IS_DEFINED_SET (_POSIX_PRIORITY_SCHEDULING)
 128       return _POSIX_PRIORITY_SCHEDULING;
 129 #else
 130       return -1;
 131 #endif
 132
 133     case _SC_TIMERS:
 134 #if CONF_IS_DEFINED_SET (_POSIX_TIMERS)
 135       return _POSIX_TIMERS;
 136 #else
 137       return -1;
 138 #endif
 139
 140     case _SC_ASYNCHRONOUS_IO:
 141 #if CONF_IS_DEFINED_SET (_POSIX_ASYNCHRONOUS_IO)
 142       return _POSIX_ASYNCHRONOUS_IO;
 143 #else
 144       return -1;
 145 #endif
 146
 147     case _SC_PRIORITIZED_IO:
 148 #if CONF_IS_DEFINED_SET (_POSIX_PRIORITIZED_IO)
 149       return _POSIX_PRIORITIZED_IO;
 150 #else
 151       return -1;
 152 #endif
 153
 154     case _SC_SYNCHRONIZED_IO:
 155 #if CONF_IS_DEFINED_SET (_POSIX_SYNCHRONIZED_IO)
 156       return _POSIX_SYNCHRONIZED_IO;
 157 #else
 158       return -1;
 159 #endif
 160
 161     case _SC_FSYNC:
 162 #if CONF_IS_DEFINED_SET (_POSIX_FSYNC)
 163       return _POSIX_FSYNC;
 164 #else
 165       return -1;
 166 #endif
 167
 168     case _SC_MAPPED_FILES:
 169 #if CONF_IS_DEFINED_SET (_POSIX_MAPPED_FILES)
 170       return _POSIX_MAPPED_FILES;
 171 #else
 172       return -1;
 173 #endif
 174
 175     case _SC_MEMLOCK:
 176 #if CONF_IS_DEFINED_SET (_POSIX_MEMLOCK)
 177       return _POSIX_MEMLOCK;
 178 #else
 179       return -1;
 180 #endif
 181
 182     case _SC_MEMLOCK_RANGE:
 183 #if CONF_IS_DEFINED_SET (_POSIX_MEMLOCK_RANGE)
 184       return _POSIX_MEMLOCK_RANGE;
 185 #else
 186       return -1;
 187 #endif
 188
 189     case _SC_MEMORY_PROTECTION:
 190 #if CONF_IS_DEFINED_SET (_POSIX_MEMORY_PROTECTION)
 191       return _POSIX_MEMORY_PROTECTION;
 192 #else
 193       return -1;
 194 #endif
 195
 196     case _SC_MESSAGE_PASSING:
 197 #if CONF_IS_DEFINED_SET (_POSIX_MESSAGE_PASSING)
 198       return _POSIX_MESSAGE_PASSING;
 199 #else
 200       return -1;
 201 #endif
 202
 203     case _SC_SEMAPHORES:
 204 #if CONF_IS_DEFINED_SET (_POSIX_SEMAPHORES)
 205       return _POSIX_SEMAPHORES;
 206 #else
 207       return -1;
 208 #endif
 209
 210     case _SC_SHARED_MEMORY_OBJECTS:
 211 #if CONF_IS_DEFINED_SET (_POSIX_SHARED_MEMORY_OBJECTS)
 212       return _POSIX_SHARED_MEMORY_OBJECTS;
 213 #else
 214       return -1;
 215 #endif
 216
 217     case _SC_VERSION:
 218       return _POSIX_VERSION;
 219
 220     case _SC_PAGESIZE:
 221       return __getpagesize ();
 222
 223     case _SC_AIO_LISTIO_MAX:
 224 #ifdef  AIO_LISTIO_MAX
 225       return AIO_LISTIO_MAX;
 226 #else
 227       return -1;
 228 #endif
 229
 230     case _SC_AIO_MAX:
 231 #ifdef  AIO_MAX
 232       return AIO_MAX;
 233 #else
 234       return -1;
 235 #endif
 236
 237     case _SC_AIO_PRIO_DELTA_MAX:
 238 #ifdef  AIO_PRIO_DELTA_MAX
 239       return AIO_PRIO_DELTA_MAX;
 240 #else
 241       return -1;
 242 #endif
 243
 244     case _SC_DELAYTIMER_MAX:
 245 #ifdef  DELAYTIMER_MAX
 246       return DELAYTIMER_MAX;
 247 #else
 248       return -1;
 249 #endif
 250
 251     case _SC_MQ_OPEN_MAX:
 252 #ifdef  MQ_OPEN_MAX
 253       return MQ_OPEN_MAX;
 254 #else
 255       return -1;
 256 #endif
 257
 258     case _SC_MQ_PRIO_MAX:
 259 #ifdef  MQ_PRIO_MAX
 260       return MQ_PRIO_MAX;
 261 #else
 262       return -1;
 263 #endif
 264
 265     case _SC_RTSIG_MAX:
 266 #ifdef  RTSIG_MAX
 267       return RTSIG_MAX;
 268 #else
 269       return -1;
 270 #endif
 271
 272     case _SC_SEM_NSEMS_MAX:
 273 #ifdef  SEM_NSEMS_MAX
 274       return SEM_NSEMS_MAX;
 275 #else
 276       return -1;
 277 #endif
 278
 279     case _SC_SEM_VALUE_MAX:
 280 #ifdef  SEM_VALUE_MAX
 281       return SEM_VALUE_MAX;
 282 #else
 283       return -1;
 284 #endif
 285
 286     case _SC_SIGQUEUE_MAX:
 287 #ifdef  SIGQUEUE_MAX
 288       return SIGQUEUE_MAX;
 289 #else
 290       return -1;
 291 #endif
 292
 293     case _SC_TIMER_MAX:
 294 #ifdef  TIMER_MAX
 295       return TIMER_MAX;
 296 #else
 297       return -1;
 298 #endif
 299
 300     case _SC_BC_BASE_MAX:
 301 #ifdef  BC_BASE_MAX
 302       return BC_BASE_MAX;
 303 #else
 304       return -1;
 305 #endif
 306
 307     case _SC_BC_DIM_MAX:
 308 #ifdef  BC_DIM_MAX
 309       return BC_DIM_MAX;
 310 #else
 311       return -1;
 312 #endif
 313
 314     case _SC_BC_SCALE_MAX:
 315 #ifdef  BC_SCALE_MAX
 316       return BC_SCALE_MAX;
 317 #else
 318       return -1;
 319 #endif
 320
 321     case _SC_BC_STRING_MAX:
 322 #ifdef  BC_STRING_MAX
 323       return BC_STRING_MAX;
 324 #else
 325       return -1;
 326 #endif
 327
 328     case _SC_COLL_WEIGHTS_MAX:
 329 #ifdef  COLL_WEIGHTS_MAX
 330       return COLL_WEIGHTS_MAX;
 331 #else
 332       return -1;
 333 #endif
 334
 335     case _SC_EXPR_NEST_MAX:
 336 #ifdef  EXPR_NEST_MAX
 337       return EXPR_NEST_MAX;
 338 #else
 339       return -1;
 340 #endif
 341
 342     case _SC_LINE_MAX:
 343 #ifdef  LINE_MAX
 344       return LINE_MAX;
 345 #else
 346       return -1;
 347 #endif
 348
 349     case _SC_RE_DUP_MAX:
 350 #ifdef  RE_DUP_MAX
 351       return RE_DUP_MAX;
 352 #else
 353       return -1;
 354 #endif
 355
 356     case _SC_CHARCLASS_NAME_MAX:
 357 #ifdef  CHARCLASS_NAME_MAX
 358       return CHARCLASS_NAME_MAX;
 359 #else
 360       return -1;
 361 #endif
 362
 363     case _SC_PII:
 364 #if CONF_IS_DEFINED_SET (_POSIX_PII)
 365       return 1;
 366 #else
 367       return -1;
 368 #endif
 369
 370     case _SC_PII_XTI:
 371 #if CONF_IS_DEFINED_SET (_POSIX_PII_XTI)
 372       return 1;
 373 #else
 374       return -1;
 375 #endif
 376
 377     case _SC_PII_SOCKET:
 378 #if CONF_IS_DEFINED_SET (_POSIX_PII_SOCKET)
 379       return 1;
 380 #else
 381       return -1;
 382 #endif
 383
 384     case _SC_PII_INTERNET:
 385 #if CONF_IS_DEFINED_SET (_POSIX_PII_INTERNET)
 386       return 1;
 387 #else
 388       return -1;
 389 #endif
 390
 391     case _SC_PII_OSI:
 392 #if CONF_IS_DEFINED_SET (_POSIX_PII_OSI)
 393       return 1;
 394 #else
 395       return -1;
 396 #endif
 397
 398     case _SC_POLL:
 399 #if CONF_IS_DEFINED_SET (_POSIX_POLL)
 400       return 1;
 401 #else
 402       return -1;
 403 #endif
 404
 405     case _SC_SELECT:
 406 #if CONF_IS_DEFINED_SET (_POSIX_SELECT)
 407       return 1;
 408 #else
 409       return -1;
 410 #endif
 411
 412       /* The same as _SC_IOV_MAX.  */
 413     case _SC_UIO_MAXIOV:
 414 #ifdef  UIO_MAXIOV
 415       return UIO_MAXIOV;
 416 #else
 417       return -1;
 418 #endif
 419
 420     case _SC_PII_INTERNET_STREAM:
 421 #if CONF_IS_DEFINED_SET (_POSIX_PII_INTERNET_STREAM)
 422       return 1;
 423 #else
 424       return -1;
 425 #endif
 426
 427     case _SC_PII_INTERNET_DGRAM:
 428 #if CONF_IS_DEFINED_SET (_POSIX_PII_INTERNET_DGRAM)
 429       return 1;
 430 #else
 431       return -1;
 432 #endif
 433
 434     case _SC_PII_OSI_COTS:
 435 #if CONF_IS_DEFINED_SET (_POSIX_PII_OSI_COTS)
 436       return 1;
 437 #else
 438       return -1;
 439 #endif
 440
 441     case _SC_PII_OSI_CLTS:
 442 #if CONF_IS_DEFINED_SET (_POSIX_PII_OSI_CLTS)
 443       return 1;
 444 #else
 445       return -1;
 446 #endif
 447
 448     case _SC_PII_OSI_M:
 449 #if CONF_IS_DEFINED_SET (_POSIX_PII_OSI_M)
 450       return 1;
 451 #else
 452       return -1;
 453 #endif
 454
 455     case _SC_T_IOV_MAX:
 456 #ifdef  _T_IOV_MAX
 457       return _T_IOV_MAX;
 458 #else
 459       return -1;
 460 #endif
 461
 462     case _SC_2_VERSION:
 463       return _POSIX2_VERSION;
 464
 465     case _SC_2_C_BIND:
 466 #ifdef  _POSIX2_C_BIND
 467       return _POSIX2_C_BIND;
 468 #else
 469       return -1;
 470 #endif
 471
 472     case _SC_2_C_DEV:
 473 #ifdef  _POSIX2_C_DEV
 474       return _POSIX2_C_DEV;
 475 #else
 476       return -1;
 477 #endif
 478
 479     case _SC_2_C_VERSION:
 480 #ifdef  _POSIX2_C_VERSION
 481       return _POSIX2_C_VERSION;
 482 #else
 483       return -1;
 484 #endif
 485
 486     case _SC_2_FORT_DEV:
 487 #ifdef  _POSIX2_FORT_DEV
 488       return _POSIX2_FORT_DEV;
 489 #else
 490       return -1;
 491 #endif
 492
 493     case _SC_2_FORT_RUN:
 494 #ifdef  _POSIX2_FORT_RUN
 495       return _POSIX2_FORT_RUN;
 496 #else
 497       return -1;
 498 #endif
 499
 500     case _SC_2_LOCALEDEF:
 501 #ifdef  _POSIX2_LOCALEDEF
 502       return _POSIX2_LOCALEDEF;
 503 #else
 504       return -1;
 505 #endif
 506
 507     case _SC_2_SW_DEV:
 508 #ifdef  _POSIX2_SW_DEV
 509       return _POSIX2_SW_DEV;
 510 #else
 511       return -1;
 512 #endif
 513
 514     case _SC_2_CHAR_TERM:
 515 #ifdef  _POSIX2_CHAR_TERM
 516       return _POSIX2_CHAR_TERM;
 517 #else
 518       return -1;
 519 #endif
 520
 521     case _SC_2_UPE:
 522 #ifdef  _POSIX2_UPE
 523       return _POSIX2_UPE;
 524 #else
 525       return -1;
 526 #endif
 527
 528       /* POSIX 1003.1c (POSIX Threads).  */
 529     case _SC_THREADS:
 530 #if CONF_IS_DEFINED_SET (_POSIX_THREADS)
 531       return _POSIX_THREADS;
 532 #else
 533       return -1;
 534 #endif
 535
 536     case _SC_THREAD_SAFE_FUNCTIONS:
 537 #if CONF_IS_DEFINED_SET (_POSIX_THREAD_SAFE_FUNCTIONS)
 538       return _POSIX_THREAD_SAFE_FUNCTIONS;
 539 #else
 540       return -1;
 541 #endif
 542
 543     case _SC_GETGR_R_SIZE_MAX:
 544       return NSS_BUFLEN_GROUP;
 545
 546     case _SC_GETPW_R_SIZE_MAX:
 547       return NSS_BUFLEN_PASSWD;
 548
 549     case _SC_LOGIN_NAME_MAX:
 550 #ifdef  LOGIN_NAME_MAX
 551       return LOGIN_NAME_MAX;
 552 #else
 553       return -1;
 554 #endif
 555
 556     case _SC_TTY_NAME_MAX:
 557 #ifdef  TTY_NAME_MAX
 558       return TTY_NAME_MAX;
 559 #else
 560       return -1;
 561 #endif
 562
 563     case _SC_THREAD_DESTRUCTOR_ITERATIONS:
 564 #if CONF_IS_DEFINED_SET (_POSIX_THREAD_DESTRUCTOR_ITERATIONS)
 565       return _POSIX_THREAD_DESTRUCTOR_ITERATIONS;
 566 #else
 567       return -1;
 568 #endif
 569
 570     case _SC_THREAD_KEYS_MAX:
 571 #ifdef  PTHREAD_KEYS_MAX
 572       return PTHREAD_KEYS_MAX;
 573 #else
 574       return -1;
 575 #endif
 576
 577     case _SC_THREAD_STACK_MIN:
 578       return __get_pthread_stack_min ();
 579
 580     case _SC_THREAD_THREADS_MAX:
 581 #ifdef  PTHREAD_THREADS_MAX
 582       return PTHREAD_THREADS_MAX;
 583 #else
 584       return -1;
 585 #endif
 586
 587     case _SC_THREAD_ATTR_STACKADDR:
 588 #if CONF_IS_DEFINED_SET (_POSIX_THREAD_ATTR_STACKADDR)
 589       return _POSIX_THREAD_ATTR_STACKADDR;
 590 #else
 591       return -1;
 592 #endif
 593
 594     case _SC_THREAD_ATTR_STACKSIZE:
 595 #if CONF_IS_DEFINED_SET (_POSIX_THREAD_ATTR_STACKSIZE)
 596       return _POSIX_THREAD_ATTR_STACKSIZE;
 597 #else
 598       return -1;
 599 #endif
 600
 601     case _SC_THREAD_PRIORITY_SCHEDULING:
 602 #if CONF_IS_DEFINED_SET (_POSIX_THREAD_PRIORITY_SCHEDULING)
 603       return _POSIX_THREAD_PRIORITY_SCHEDULING;
 604 #else
 605       return -1;
 606 #endif
 607
 608     case _SC_THREAD_PRIO_INHERIT:
 609 #if CONF_IS_DEFINED_SET (_POSIX_THREAD_PRIO_INHERIT)
 610       return _POSIX_THREAD_PRIO_INHERIT;
 611 #else
 612       return -1;
 613 #endif
 614
 615     case _SC_THREAD_PRIO_PROTECT:
 616 #if CONF_IS_DEFINED_SET (_POSIX_THREAD_PRIO_PROTECT)
 617       return _POSIX_THREAD_PRIO_PROTECT;
 618 #else
 619       return -1;
 620 #endif
 621
 622     case _SC_THREAD_PROCESS_SHARED:
 623 #if CONF_IS_DEFINED_SET (_POSIX_THREAD_PROCESS_SHARED)
 624       return _POSIX_THREAD_PROCESS_SHARED;
 625 #else
 626       return -1;
 627 #endif
 628
 629     case _SC_NPROCESSORS_CONF:
 630       return __get_nprocs_conf ();
 631
 632     case _SC_NPROCESSORS_ONLN:
 633       return __get_nprocs ();
 634
 635     case _SC_PHYS_PAGES:
 636       return __get_phys_pages ();
 637
 638     case _SC_AVPHYS_PAGES:
 639       return __get_avphys_pages ();
 640
 641     case _SC_ATEXIT_MAX:
 642       /* We have no limit since we use lists.  */
 643       return INT_MAX;
 644
 645     case _SC_PASS_MAX:
 646       /* We have no limit but since the return value might be used to
 647          allocate a buffer we restrict the value.  */
 648       return BUFSIZ;
 649
 650     case _SC_XOPEN_VERSION:
 651       return _XOPEN_VERSION;
 652
 653     case _SC_XOPEN_XCU_VERSION:
 654       return _XOPEN_XCU_VERSION;
 655
 656     case _SC_XOPEN_UNIX:
 657       return _XOPEN_UNIX;
 658
 659     case _SC_XOPEN_CRYPT:
 660 #ifdef  _XOPEN_CRYPT
 661       return _XOPEN_CRYPT;
 662 #else
 663       return -1;
 664 #endif
 665
 666     case _SC_XOPEN_ENH_I18N:
 667 #ifdef  _XOPEN_ENH_I18N
 668       return _XOPEN_ENH_I18N;
 669 #else
 670       return -1;
 671 #endif
 672
 673     case _SC_XOPEN_SHM:
 674 #ifdef  _XOPEN_SHM
 675       return _XOPEN_SHM;
 676 #else
 677       return -1;
 678 #endif
 679
 680     case _SC_XOPEN_XPG2:
 681 #ifdef  _XOPEN_XPG2
 682       return _XOPEN_XPG2;
 683 #else
 684       return -1;
 685 #endif
 686
 687     case _SC_XOPEN_XPG3:
 688 #ifdef  _XOPEN_XPG3
 689       return _XOPEN_XPG3;
 690 #else
 691       return -1;
 692 #endif
 693
 694     case _SC_XOPEN_XPG4:
 695 #ifdef  _XOPEN_XPG4
 696       return _XOPEN_XPG4;
 697 #else
 698       return -1;
 699 #endif
 700
 701     case _SC_CHAR_BIT:
 702       return CHAR_BIT;
 703
 704     case _SC_CHAR_MAX:
 705       return CHAR_MAX;
 706
 707     case _SC_CHAR_MIN:
 708       return CHAR_MIN;
 709
 710     case _SC_INT_MAX:
 711       return INT_MAX;
 712
 713     case _SC_INT_MIN:
 714       return INT_MIN;
 715
 716     case _SC_LONG_BIT:
 717       return sizeof (long int) * CHAR_BIT;
 718
 719     case _SC_WORD_BIT:
 720       return sizeof (int) * CHAR_BIT;
 721
 722     case _SC_MB_LEN_MAX:
 723       return MB_LEN_MAX;
 724
 725     case _SC_NZERO:
 726       return NZERO;
 727
 728     case _SC_SSIZE_MAX:
 729       return _POSIX_SSIZE_MAX;
 730
 731     case _SC_SCHAR_MAX:
 732       return SCHAR_MAX;
 733
 734     case _SC_SCHAR_MIN:
 735       return SCHAR_MIN;
 736
 737     case _SC_SHRT_MAX:
 738       return SHRT_MAX;
 739
 740     case _SC_SHRT_MIN:
 741       return SHRT_MIN;
 742
 743     case _SC_UCHAR_MAX:
 744       return UCHAR_MAX;
 745
 746     case _SC_UINT_MAX:
 747       return UINT_MAX;
 748
 749     case _SC_ULONG_MAX:
 750       return ULONG_MAX;
 751
 752     case _SC_USHRT_MAX:
 753       return USHRT_MAX;
 754
 755     case _SC_NL_ARGMAX:
 756 #ifdef  NL_ARGMAX
 757       return NL_ARGMAX;
 758 #else
 759       return -1;
 760 #endif
 761
 762     case _SC_NL_LANGMAX:
 763 #ifdef  NL_LANGMAX
 764       return NL_LANGMAX;
 765 #else
 766       return -1;
 767 #endif
 768
 769     case _SC_NL_MSGMAX:
 770 #ifdef  NL_MSGMAX
 771       return NL_MSGMAX;
 772 #else
 773       return -1;
 774 #endif
 775
 776     case _SC_NL_NMAX:
 777 #ifdef  NL_NMAX
 778       return NL_NMAX;
 779 #else
 780       return -1;
 781 #endif
 782
 783     case _SC_NL_SETMAX:
 784 #ifdef  NL_SETMAX
 785       return NL_SETMAX;
 786 #else
 787       return -1;
 788 #endif
 789
 790     case _SC_NL_TEXTMAX:
 791 #ifdef  NL_TEXTMAX
 792       return NL_TEXTMAX;
 793 #else
 794       return -1;
 795 #endif
 796
 797 #define START_ENV_GROUP(VERSION)                \
 798       /* Empty.  */
 799
 800 #define END_ENV_GROUP(VERSION)                  \
 801       /* Empty.  */
 802
 803 #define KNOWN_ABSENT_ENVIRONMENT(SC_PREFIX, ENV_PREFIX, SUFFIX) \
 804     case _SC_##SC_PREFIX##_##SUFFIX:                            \
 805       return _##ENV_PREFIX##_##SUFFIX;
 806
 807 #define KNOWN_PRESENT_ENVIRONMENT(SC_PREFIX, ENV_PREFIX, SUFFIX)        \
 808     case _SC_##SC_PREFIX##_##SUFFIX:                                    \
 809       return _##ENV_PREFIX##_##SUFFIX;
 810
 811 #define UNKNOWN_ENVIRONMENT(SC_PREFIX, ENV_PREFIX, SUFFIX)      \
 812     case _SC_##SC_PREFIX##_##SUFFIX:                            \
 813       return __sysconf_check_spec (#SUFFIX);
 814
 815 #include <posix/posix-envs.def>
 816
 817 #undef START_ENV_GROUP
 818 #undef END_ENV_GROUP
 819 #undef KNOWN_ABSENT_ENVIRONMENT
 820 #undef KNOWN_PRESENT_ENVIRONMENT
 821 #undef UNKNOWN_ENVIRONMENT
 822
 823     case _SC_XOPEN_LEGACY:
 824       return _XOPEN_LEGACY;
 825
 826     case _SC_XOPEN_REALTIME:
 827 #ifdef _XOPEN_REALTIME
 828       return _XOPEN_REALTIME;
 829 #else
 830       return -1;
 831 #endif
 832     case _SC_XOPEN_REALTIME_THREADS:
 833 #ifdef _XOPEN_REALTIME_THREADS
 834       return _XOPEN_REALTIME_THREADS;
 835 #else
 836       return -1;
 837 #endif
 838
 839     case _SC_ADVISORY_INFO:
 840 #if CONF_IS_DEFINED_SET (_POSIX_ADVISORY_INFO)
 841       return _POSIX_ADVISORY_INFO;
 842 #else
 843       return -1;
 844 #endif
 845
 846     case _SC_BARRIERS:
 847 #if CONF_IS_DEFINED_SET (_POSIX_BARRIERS)
 848       return _POSIX_BARRIERS;
 849 #else
 850       return -1;
 851 #endif
 852
 853     case _SC_BASE:
 854 #if CONF_IS_DEFINED_SET (_POSIX_BASE)
 855       return _POSIX_BASE;
 856 #else
 857       return -1;
 858 #endif
 859     case _SC_C_LANG_SUPPORT:
 860 #if CONF_IS_DEFINED_SET (_POSIX_C_LANG_SUPPORT)
 861       return _POSIX_C_LANG_SUPPORT;
 862 #else
 863       return -1;
 864 #endif
 865     case _SC_C_LANG_SUPPORT_R:
 866 #if CONF_IS_DEFINED_SET (_POSIX_C_LANG_SUPPORT_R)
 867       return _POSIX_C_LANG_SUPPORT_R;
 868 #else
 869       return -1;
 870 #endif
 871
 872     case _SC_CLOCK_SELECTION:
 873 #if CONF_IS_DEFINED_SET (_POSIX_CLOCK_SELECTION)
 874       return _POSIX_CLOCK_SELECTION;
 875 #else
 876       return -1;
 877 #endif
 878
 879     case _SC_CPUTIME:
 880 #if CONF_IS_DEFINED_SET (_POSIX_CPUTIME)
 881       return _POSIX_CPUTIME;
 882 #else
 883       return -1;
 884 #endif
 885
 886     case _SC_DEVICE_IO:
 887 #if CONF_IS_DEFINED_SET (_POSIX_DEVICE_IO)
 888       return _POSIX_DEVICE_IO;
 889 #else
 890       return -1;
 891 #endif
 892     case _SC_DEVICE_SPECIFIC:
 893 #if CONF_IS_DEFINED_SET (_POSIX_DEVICE_SPECIFIC)
 894       return _POSIX_DEVICE_SPECIFIC;
 895 #else
 896       return -1;
 897 #endif
 898     case _SC_DEVICE_SPECIFIC_R:
 899 #if CONF_IS_DEFINED_SET (_POSIX_DEVICE_SPECIFIC_R)
 900       return _POSIX_DEVICE_SPECIFIC_R;
 901 #else
 902       return -1;
 903 #endif
 904
 905     case _SC_FD_MGMT:
 906 #if CONF_IS_DEFINED_SET (_POSIX_FD_MGMT)
 907       return _POSIX_FD_MGMT;
 908 #else
 909       return -1;
 910 #endif
 911
 912     case _SC_FIFO:
 913 #if CONF_IS_DEFINED_SET (_POSIX_FIFO)
 914       return _POSIX_FIFO;
 915 #else
 916       return -1;
 917 #endif
 918     case _SC_PIPE:
 919 #if CONF_IS_DEFINED_SET (_POSIX_PIPE)
 920       return _POSIX_PIPE;
 921 #else
 922       return -1;
 923 #endif
 924
 925     case _SC_FILE_ATTRIBUTES:
 926 #if CONF_IS_DEFINED_SET (_POSIX_FILE_ATTRIBUTES)
 927       return _POSIX_FILE_ATTRIBUTES;
 928 #else
 929       return -1;
 930 #endif
 931     case _SC_FILE_LOCKING:
 932 #if CONF_IS_DEFINED_SET (_POSIX_FILE_LOCKING)
 933       return _POSIX_FILE_LOCKING;
 934 #else
 935       return -1;
 936 #endif
 937     case _SC_FILE_SYSTEM:
 938 #if CONF_IS_DEFINED_SET (_POSIX_FILE_SYSTEM)
 939       return _POSIX_FILE_SYSTEM;
 940 #else
 941       return -1;
 942 #endif
 943
 944     case _SC_MONOTONIC_CLOCK:
 945 #if CONF_IS_DEFINED_SET (_POSIX_MONOTONIC_CLOCK)
 946       return _POSIX_MONOTONIC_CLOCK;
 947 #else
 948       return -1;
 949 #endif
 950
 951     case _SC_MULTI_PROCESS:
 952 #if CONF_IS_DEFINED_SET (_POSIX_MULTI_PROCESS)
 953       return _POSIX_MULTI_PROCESS;
 954 #else
 955       return -1;
 956 #endif
 957     case _SC_SINGLE_PROCESS:
 958 #if CONF_IS_DEFINED_SET (_POSIX_SINGLE_PROCESS)
 959       return _POSIX_SINGLE_PROCESS;
 960 #else
 961       return -1;
 962 #endif
 963
 964     case _SC_NETWORKING:
 965 #if CONF_IS_DEFINED_SET (_POSIX_NETWORKING)
 966       return _POSIX_NETWORKING;
 967 #else
 968       return -1;
 969 #endif
 970
 971     case _SC_READER_WRITER_LOCKS:
 972 #if CONF_IS_DEFINED_SET (_POSIX_READER_WRITER_LOCKS)
 973       return _POSIX_READER_WRITER_LOCKS;
 974 #else
 975       return -1;
 976 #endif
 977     case _SC_SPIN_LOCKS:
 978 #if CONF_IS_DEFINED_SET (_POSIX_SPIN_LOCKS)
 979       return _POSIX_SPIN_LOCKS;
 980 #else
 981       return -1;
 982 #endif
 983
 984     case _SC_REGEXP:
 985 #if CONF_IS_DEFINED_SET (_POSIX_REGEXP)
 986       return _POSIX_REGEXP;
 987 #else
 988       return -1;
 989 #endif
 990     /* _REGEX_VERSION has been removed with IEEE Std 1003.1-2001/Cor 2-2004,
 991        item XSH/TC2/D6/137.  */
 992     case _SC_REGEX_VERSION:
 993       return -1;
 994
 995     case _SC_SHELL:
 996 #if CONF_IS_DEFINED_SET (_POSIX_SHELL)
 997       return _POSIX_SHELL;
 998 #else
 999       return -1;
1000 #endif
1001
1002     case _SC_SIGNALS:
1003 #if CONF_IS_DEFINED (_POSIX_SIGNALS)
1004       return _POSIX_SIGNALS;
1005 #else
1006       return -1;
1007 #endif
1008
1009     case _SC_SPAWN:
1010 #if CONF_IS_DEFINED_SET (_POSIX_SPAWN)
1011       return _POSIX_SPAWN;
1012 #else
1013       return -1;
1014 #endif
1015
1016     case _SC_SPORADIC_SERVER:
1017 #if CONF_IS_DEFINED_SET (_POSIX_SPORADIC_SERVER)
1018       return _POSIX_SPORADIC_SERVER;
1019 #else
1020       return -1;
1021 #endif
1022     case _SC_THREAD_SPORADIC_SERVER:
1023 #if CONF_IS_DEFINED_SET (_POSIX_THREAD_SPORADIC_SERVER)
1024       return _POSIX_THREAD_SPORADIC_SERVER;
1025 #else
1026       return -1;
1027 #endif
1028
1029     case _SC_SYSTEM_DATABASE:
1030 #if CONF_IS_DEFINED_SET (_POSIX_SYSTEM_DATABASE)
1031       return _POSIX_SYSTEM_DATABASE;
1032 #else
1033       return -1;
1034 #endif
1035     case _SC_SYSTEM_DATABASE_R:
1036 #if CONF_IS_DEFINED_SET (_POSIX_SYSTEM_DATABASE_R)
1037       return _POSIX_SYSTEM_DATABASE_R;
1038 #else
1039       return -1;
1040 #endif
1041
1042     case _SC_THREAD_CPUTIME:
1043 #if CONF_IS_DEFINED_SET (_POSIX_THREAD_CPUTIME)
1044       return _POSIX_THREAD_CPUTIME;
1045 #else
1046       return -1;
1047 #endif
1048
1049     case _SC_TIMEOUTS:
1050 #if CONF_IS_DEFINED_SET (_POSIX_TIMEOUTS)
1051       return _POSIX_TIMEOUTS;
1052 #else
1053       return -1;
1054 #endif
1055
1056     case _SC_TYPED_MEMORY_OBJECTS:
1057 #if CONF_IS_DEFINED_SET (_POSIX_TYPED_MEMORY_OBJECTS)
1058       return _POSIX_TYPED_MEMORY_OBJECTS;
1059 #else
1060       return -1;
1061 #endif
1062
1063     case _SC_USER_GROUPS:
1064 #if CONF_IS_DEFINED_SET (_POSIX_USER_GROUPS)
1065       return _POSIX_USER_GROUPS;
1066 #else
1067       return -1;
1068 #endif
1069     case _SC_USER_GROUPS_R:
1070 #if CONF_IS_DEFINED_SET (_POSIX_USER_GROUPS_R)
1071       return _POSIX_USER_GROUPS_R;
1072 #else
1073       return -1;
1074 #endif
1075
1076     case _SC_2_PBS:
1077 #ifdef _POSIX2_PBS
1078       return _POSIX2_PBS;
1079 #else
1080       return -1;
1081 #endif
1082     case _SC_2_PBS_ACCOUNTING:
1083 #ifdef _POSIX2_PBS_ACCOUNTING
1084       return _POSIX2_PBS_ACCOUNTING;
1085 #else
1086       return -1;
1087 #endif
1088     case _SC_2_PBS_CHECKPOINT:
1089 #ifdef _POSIX2_PBS_CHECKPOINT
1090       return _POSIX2_PBS_CHECKPOINT;
1091 #else
1092       return -1;
1093 #endif
1094     case _SC_2_PBS_LOCATE:
1095 #ifdef _POSIX2_PBS_LOCATE
1096       return _POSIX2_PBS_LOCATE;
1097 #else
1098       return -1;
1099 #endif
1100     case _SC_2_PBS_MESSAGE:
1101 #ifdef _POSIX2_PBS_MESSAGE
1102       return _POSIX2_PBS_MESSAGE;
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       return -1;
1122
1123     case _SC_HOST_NAME_MAX:
1124 #ifdef HOST_NAME_MAX
1125       return HOST_NAME_MAX;
1126 #else
1127       return -1;
1128 #endif
1129
1130     case _SC_TRACE:
1131 #if CONF_IS_DEFINED_SET (_POSIX_TRACE)
1132       return _POSIX_TRACE;
1133 #else
1134       return -1;
1135 #endif
1136     case _SC_TRACE_EVENT_FILTER:
1137 #if CONF_IS_DEFINED_SET (_POSIX_TRACE_EVENT_FILTER)
1138       return _POSIX_TRACE_EVENT_FILTER;
1139 #else
1140       return -1;
1141 #endif
1142     case _SC_TRACE_INHERIT:
1143 #if CONF_IS_DEFINED_SET (_POSIX_TRACE_INHERIT)
1144       return _POSIX_TRACE_INHERIT;
1145 #else
1146       return -1;
1147 #endif
1148     case _SC_TRACE_LOG:
1149 #if CONF_IS_DEFINED_SET (_POSIX_TRACE_LOG)
1150       return _POSIX_TRACE_LOG;
1151 #else
1152       return -1;
1153 #endif
1154
1155     case _SC_TRACE_EVENT_NAME_MAX:
1156     case _SC_TRACE_NAME_MAX:
1157     case _SC_TRACE_SYS_MAX:
1158     case _SC_TRACE_USER_EVENT_MAX:
1159       /* No support for tracing.  */
1160
1161     case _SC_XOPEN_STREAMS:
1162       /* No support for STREAMS.  */
1163       return -1;
1164
1165     case _SC_LEVEL1_ICACHE_SIZE:
1166     case _SC_LEVEL1_ICACHE_ASSOC:
1167     case _SC_LEVEL1_ICACHE_LINESIZE:
1168     case _SC_LEVEL1_DCACHE_SIZE:
1169     case _SC_LEVEL1_DCACHE_ASSOC:
1170     case _SC_LEVEL1_DCACHE_LINESIZE:
1171     case _SC_LEVEL2_CACHE_SIZE:
1172     case _SC_LEVEL2_CACHE_ASSOC:
1173     case _SC_LEVEL2_CACHE_LINESIZE:
1174     case _SC_LEVEL3_CACHE_SIZE:
1175     case _SC_LEVEL3_CACHE_ASSOC:
1176     case _SC_LEVEL3_CACHE_LINESIZE:
1177     case _SC_LEVEL4_CACHE_SIZE:
1178     case _SC_LEVEL4_CACHE_ASSOC:
1179     case _SC_LEVEL4_CACHE_LINESIZE:
1180       /* In general we cannot determine these values.  Therefore we
1181          return zero which indicates that no information is
1182          available.  */
1183       return 0;
1184
1185     case _SC_IPV6:
1186 #if CONF_IS_DEFINED_SET (_POSIX_IPV6)
1187       return _POSIX_IPV6;
1188 #else
1189       return -1;
1190 #endif
1191
1192     case _SC_RAW_SOCKETS:
1193 #if CONF_IS_DEFINED_SET (_POSIX_RAW_SOCKETS)
1194       return _POSIX_RAW_SOCKETS;
1195 #else
1196       return -1;
1197 #endif
1198
1199     case _SC_SIGSTKSZ:
1200 #ifdef SIGSTKSZ
1201       return SIGSTKSZ;
1202 #else
1203       return -1;
1204 #endif
1205
1206     case _SC_MINSIGSTKSZ:
1207 #ifdef MINSIGSTKSZ
1208       return MINSIGSTKSZ;
1209 #else
1210       return -1;
1211 #endif
1212     }
1213 }
1214
1215 #undef __sysconf
1216 weak_alias (__sysconf, sysconf)
1217 libc_hidden_def (__sysconf)
1218
1219 #if NEED_CHECK_SPEC
1220 static long int
1221 __sysconf_check_spec (const char *spec)
1222 {
1223   int save_errno = errno;
1224
1225   const char *getconf_dir = __libc_secure_getenv ("GETCONF_DIR") ?: GETCONF_DIR;
1226   size_t getconf_dirlen = strlen (getconf_dir);
1227   size_t speclen = strlen (spec);
1228
1229   char name[getconf_dirlen + sizeof ("/POSIX_V6_") + speclen];
1230   memcpy (mempcpy (mempcpy (name, getconf_dir, getconf_dirlen),
1231                    "/POSIX_V6_", sizeof ("/POSIX_V6_") - 1),
1232           spec, speclen + 1);
1233
1234   struct __stat64_t64 st;
1235   long int ret = __stat64_time64 (name, &st) >= 0 ? 1 : -1;
1236
1237   __set_errno (save_errno);
1238   return ret;
1239 }
1240 #endif