sysdeps/posix/sysconf.c

   1 /* Copyright (C) 1991, 1993, 1995, 1996, 1997 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
  29
  30 /* Get the value of the system variable NAME.  */
  31 long int
  32 __sysconf (name)
  33      int name;
  34 {
  35   switch (name)
  36     {
  37     default:
  38       __set_errno (EINVAL);
  39       return -1;
  40
  41     case _SC_ARG_MAX:
  42 #ifdef  ARG_MAX
  43       return ARG_MAX;
  44 #else
  45       return -1;
  46 #endif
  47
  48     case _SC_CHILD_MAX:
  49 #ifdef  CHILD_MAX
  50       return CHILD_MAX;
  51 #else
  52       return -1;
  53 #endif
  54
  55     case _SC_CLK_TCK:
  56 #ifdef  CLK_TCK
  57       return CLK_TCK;
  58 #else
  59       return 60;
  60 #endif
  61
  62     case _SC_NGROUPS_MAX:
  63 #ifdef  NGROUPS_MAX
  64       return NGROUPS_MAX;
  65 #else
  66       return -1;
  67 #endif
  68
  69     case _SC_OPEN_MAX:
  70       return __getdtablesize ();
  71
  72     case _SC_STREAM_MAX:
  73 #ifdef  STREAM_MAX
  74       return STREAM_MAX;
  75 #else
  76       return FOPEN_MAX;
  77 #endif
  78
  79     case _SC_TZNAME_MAX:
  80       return __tzname_max ();
  81
  82     case _SC_JOB_CONTROL:
  83 #ifdef  _POSIX_JOB_CONTROL
  84       return 1;
  85 #else
  86       return -1;
  87 #endif
  88
  89     case _SC_SAVED_IDS:
  90 #ifdef  _POSIX_SAVED_IDS
  91       return 1;
  92 #else
  93       return -1;
  94 #endif
  95
  96     case _SC_REALTIME_SIGNALS:
  97 #ifdef  _POSIX_REALTIME_SIGNALS
  98       return 1;
  99 #else
 100       return -1;
 101 #endif
 102
 103     case _SC_PRIORITY_SCHEDULING:
 104 #ifdef  _POSIX_PRIORITY_SCHEDULING
 105       return 1;
 106 #else
 107       return -1;
 108 #endif
 109
 110     case _SC_TIMERS:
 111 #ifdef  _POSIX_TIMERS
 112       return 1;
 113 #else
 114       return -1;
 115 #endif
 116
 117     case _SC_ASYNCHRONOUS_IO:
 118 #ifdef  _POSIX_ASYNCHRONOUS_IO
 119       return 1;
 120 #else
 121       return -1;
 122 #endif
 123
 124     case _SC_PRIORITIZED_IO:
 125 #ifdef  _POSIX_PRIORITIZED_IO
 126       return 1;
 127 #else
 128       return -1;
 129 #endif
 130
 131     case _SC_SYNCHRONIZED_IO:
 132 #ifdef  _POSIX_SYNCHRONIZED_IO
 133       return 1;
 134 #else
 135       return -1;
 136 #endif
 137
 138     case _SC_FSYNC:
 139 #ifdef  _POSIX_FSYNC
 140       return 1;
 141 #else
 142       return -1;
 143 #endif
 144
 145     case _SC_MAPPED_FILES:
 146 #ifdef  _POSIX_MAPPED_FILES
 147       return 1;
 148 #else
 149       return -1;
 150 #endif
 151
 152     case _SC_MEMLOCK:
 153 #ifdef  _POSIX_MEMLOCK
 154       return 1;
 155 #else
 156       return -1;
 157 #endif
 158
 159     case _SC_MEMLOCK_RANGE:
 160 #ifdef  _POSIX_MEMLOCK_RANGE
 161       return 1;
 162 #else
 163       return -1;
 164 #endif
 165
 166     case _SC_MEMORY_PROTECTION:
 167 #ifdef  _POSIX_MEMORY_PROTECTION
 168       return 1;
 169 #else
 170       return -1;
 171 #endif
 172
 173     case _SC_MESSAGE_PASSING:
 174 #ifdef  _POSIX_MESSAGE_PASSING
 175       return 1;
 176 #else
 177       return -1;
 178 #endif
 179
 180     case _SC_SEMAPHORES:
 181 #ifdef  _POSIX_SEMAPHORES
 182       return 1;
 183 #else
 184       return -1;
 185 #endif
 186
 187     case _SC_SHARED_MEMORY_OBJECTS:
 188 #ifdef  _POSIX_SHARED_MEMORY_OBJECTS
 189       return 1;
 190 #else
 191       return -1;
 192 #endif
 193
 194     case _SC_VERSION:
 195       return _POSIX_VERSION;
 196
 197     case _SC_PAGESIZE:
 198       return __getpagesize ();
 199
 200     case _SC_AIO_LISTIO_MAX:
 201 #ifdef  AIO_LISTIO_MAX
 202       return AIO_LISTIO_MAX;
 203 #else
 204       return -1;
 205 #endif
 206
 207     case _SC_AIO_MAX:
 208 #ifdef  AIO_MAX
 209       return AIO_MAX;
 210 #else
 211       return -1;
 212 #endif
 213
 214     case _SC_AIO_PRIO_DELTA_MAX:
 215 #ifdef  AIO_PRIO_DELTA_MAX
 216       return AIO_PRIO_DELTA_MAX;
 217 #else
 218       return -1;
 219 #endif
 220
 221     case _SC_DELAYTIMER_MAX:
 222 #ifdef  DELAYTIMER_MAX
 223       return DELAYTIMER_MAX;
 224 #else
 225       return -1;
 226 #endif
 227
 228     case _SC_MQ_OPEN_MAX:
 229 #ifdef  MQ_OPEN_MAX
 230       return MQ_OPEN_MAX;
 231 #else
 232       return -1;
 233 #endif
 234
 235     case _SC_MQ_PRIO_MAX:
 236 #ifdef  MQ_PRIO_MAX
 237       return MQ_PRIO_MAX;
 238 #else
 239       return -1;
 240 #endif
 241
 242     case _SC_RTSIG_MAX:
 243 #ifdef  RTSIG_MAX
 244       return RTSIG_MAX;
 245 #else
 246       return -1;
 247 #endif
 248
 249     case _SC_SEM_NSEMS_MAX:
 250 #ifdef  SEM_NSEMS_MAX
 251       return SEM_NSEMS_MAX;
 252 #else
 253       return -1;
 254 #endif
 255
 256     case _SC_SEM_VALUE_MAX:
 257 #ifdef  SEM_VALUE_MAX
 258       return SEM_VALUE_MAX;
 259 #else
 260       return -1;
 261 #endif
 262
 263     case _SC_SIGQUEUE_MAX:
 264 #ifdef  SIGQUEUE_MAX
 265       return SIGQUEUE_MAX;
 266 #else
 267       return -1;
 268 #endif
 269
 270     case _SC_TIMER_MAX:
 271 #ifdef  TIMER_MAX
 272       return TIMER_MAX;
 273 #else
 274       return -1;
 275 #endif
 276
 277     case _SC_BC_BASE_MAX:
 278 #ifdef  BC_BASE_MAX
 279       return BC_BASE_MAX;
 280 #else
 281       return -1;
 282 #endif
 283
 284     case _SC_BC_DIM_MAX:
 285 #ifdef  BC_DIM_MAX
 286       return BC_DIM_MAX;
 287 #else
 288       return -1;
 289 #endif
 290
 291     case _SC_BC_SCALE_MAX:
 292 #ifdef  BC_SCALE_MAX
 293       return BC_SCALE_MAX;
 294 #else
 295       return -1;
 296 #endif
 297
 298     case _SC_BC_STRING_MAX:
 299 #ifdef  BC_STRING_MAX
 300       return BC_STRING_MAX;
 301 #else
 302       return -1;
 303 #endif
 304
 305     case _SC_COLL_WEIGHTS_MAX:
 306 #ifdef  COLL_WEIGHTS_MAX
 307       return COLL_WEIGHTS_MAX;
 308 #else
 309       return -1;
 310 #endif
 311
 312     case _SC_EQUIV_CLASS_MAX:
 313 #ifdef  EQUIV_CLASS_MAX
 314       return EQUIV_CLASS_MAX;
 315 #else
 316       return -1;
 317 #endif
 318
 319     case _SC_EXPR_NEST_MAX:
 320 #ifdef  EXPR_NEST_MAX
 321       return EXPR_NEST_MAX;
 322 #else
 323       return -1;
 324 #endif
 325
 326     case _SC_LINE_MAX:
 327 #ifdef  LINE_MAX
 328       return LINE_MAX;
 329 #else
 330       return -1;
 331 #endif
 332
 333     case _SC_RE_DUP_MAX:
 334 #ifdef  RE_DUP_MAX
 335       return RE_DUP_MAX;
 336 #else
 337       return -1;
 338 #endif
 339
 340     case _SC_CHARCLASS_NAME_MAX:
 341 #ifdef  CHARCLASS_NAME_MAX
 342       return CHARCLASS_NAME_MAX;
 343 #else
 344       return -1;
 345 #endif
 346
 347     case _SC_PII:
 348 #ifdef  _POSIX_PII
 349       return 1;
 350 #else
 351       return -1;
 352 #endif
 353
 354     case _SC_PII_XTI:
 355 #ifdef  _POSIX_PII_XTI
 356       return 1;
 357 #else
 358       return -1;
 359 #endif
 360
 361     case _SC_PII_SOCKET:
 362 #ifdef  _POSIX_PII_SOCKET
 363       return 1;
 364 #else
 365       return -1;
 366 #endif
 367
 368     case _SC_PII_INTERNET:
 369 #ifdef  _POSIX_PII_INTERNET
 370       return 1;
 371 #else
 372       return -1;
 373 #endif
 374
 375     case _SC_PII_OSI:
 376 #ifdef  _POSIX_PII_OSI
 377       return 1;
 378 #else
 379       return -1;
 380 #endif
 381
 382     case _SC_POLL:
 383 #ifdef  _POSIX_POLL
 384       return 1;
 385 #else
 386       return -1;
 387 #endif
 388
 389     case _SC_SELECT:
 390 #ifdef  _POSIX_SELECT
 391       return 1;
 392 #else
 393       return -1;
 394 #endif
 395
 396     case _SC_UIO_MAXIOV:
 397 #ifdef  UIO_MAXIOV
 398       return UIO_MAXIOV;
 399 #else
 400       return -1;
 401 #endif
 402
 403     case _SC_PII_INTERNET_STREAM:
 404 #ifdef  _POSIX_PII_INTERNET_STREAM
 405       return 1;
 406 #else
 407       return -1;
 408 #endif
 409
 410     case _SC_PII_INTERNET_DGRAM:
 411 #ifdef  _POSIX_PII_INTERNET_DGRAM
 412       return 1;
 413 #else
 414       return -1;
 415 #endif
 416
 417     case _SC_PII_OSI_COTS:
 418 #ifdef  _POSIX_PII_OSI_COTS
 419       return 1;
 420 #else
 421       return -1;
 422 #endif
 423
 424     case _SC_PII_OSI_CLTS:
 425 #ifdef  _POSIX_PII_OSI_CLTS
 426       return 1;
 427 #else
 428       return -1;
 429 #endif
 430
 431     case _SC_PII_OSI_M:
 432 #ifdef  _POSIX_PII_OSI_M
 433       return 1;
 434 #else
 435       return -1;
 436 #endif
 437
 438     case _SC_T_IOV_MAX:
 439 #ifdef  _T_IOV_MAX
 440       return _T_IOV_MAX;
 441 #else
 442       return -1;
 443 #endif
 444
 445     case _SC_2_VERSION:
 446       return _POSIX2_VERSION;
 447
 448     case _SC_2_C_BIND:
 449 #ifdef  _POSIX2_C_BIND
 450       return _POSIX2_C_BIND;
 451 #else
 452       return -1;
 453 #endif
 454
 455     case _SC_2_C_DEV:
 456 #ifdef  _POSIX2_C_DEV
 457       return _POSIX2_C_DEV;
 458 #else
 459       return -1;
 460 #endif
 461
 462     case _SC_2_C_VERSION:
 463 #ifdef  _POSIX2_C_VERSION
 464       return _POSIX2_C_VERSION;
 465 #else
 466       return -1;
 467 #endif
 468
 469     case _SC_2_FORT_DEV:
 470 #ifdef  _POSIX2_FORT_DEV
 471       return _POSIX2_FORT_DEV;
 472 #else
 473       return -1;
 474 #endif
 475
 476     case _SC_2_LOCALEDEF:
 477 #ifdef  _POSIX2_LOCALEDEF
 478       return _POSIX2_LOCALEDEF;
 479 #else
 480       return -1;
 481 #endif
 482
 483     case _SC_2_SW_DEV:
 484 #ifdef  _POSIX2_SW_DEV
 485       return _POSIX2_SW_DEV;
 486 #else
 487       return -1;
 488 #endif
 489
 490     case _SC_2_CHAR_TERM:
 491 #ifdef  _POSIX2_CHAR_TERM
 492       return _POSIX2_CHAR_TERM;
 493 #else
 494       return -1;
 495 #endif
 496
 497     case _SC_2_UPE:
 498 #ifdef  _POSIX2_UPE
 499       return _POSIX2_UPE;
 500 #else
 501       return -1;
 502 #endif
 503
 504       /* POSIX 1003.1c (POSIX Threads).  */
 505     case _SC_THREADS:
 506 #ifdef  _POSIX_THREADS
 507       return 1;
 508 #else
 509       return -1;
 510 #endif
 511
 512     case _SC_THREAD_SAFE_FUNCTIONS:
 513 #ifdef  _POSIX_THREAD_SAFE_FUNCTIONS
 514       return 1;
 515 #else
 516       return -1;
 517 #endif
 518
 519     case _SC_GETGR_R_SIZE_MAX:
 520 #ifdef  NSS_BUFLEN_GROUP
 521       return NSS_BUFLEN_GROUP;
 522 #else
 523       return -1;
 524 #endif
 525
 526     case _SC_GETPW_R_SIZE_MAX:
 527 #ifdef  NSS_BUFLEN_PASSWD
 528       return NSS_BUFLEN_PASSWD;
 529 #else
 530       return -1;
 531 #endif
 532
 533     case _SC_LOGIN_NAME_MAX:
 534 #ifdef  _POSIX_LOGIN_NAME_MAX
 535       return _POSIX_LOGIN_NAME_MAX;
 536 #else
 537       return -1;
 538 #endif
 539
 540     case _SC_TTY_NAME_MAX:
 541 #ifdef  _POSIX_TTY_NAME_MAX
 542       return _POSIX_TTY_NAME_MAX;
 543 #else
 544       return -1;
 545 #endif
 546
 547     case _SC_THREAD_DESTRUCTOR_ITERATIONS:
 548 #ifdef  _POSIX_THREAD_DESTRUCTOR_ITERATIONS
 549       return _POSIX_THREAD_DESTRUCTOR_ITERATIONS;
 550 #else
 551       return -1;
 552 #endif
 553
 554     case _SC_THREAD_KEYS_MAX:
 555 #ifdef  PTHREAD_KEYS_MAX
 556       return PTHREAD_KEYS_MAX;
 557 #else
 558       return -1;
 559 #endif
 560
 561     case _SC_THREAD_STACK_MIN:
 562 #ifdef  PTHREAD_STACK_MIN
 563       return PTHREAD_STACK_MIN;
 564 #else
 565       return -1;
 566 #endif
 567
 568     case _SC_THREAD_THREADS_MAX:
 569 #ifdef  PTHREAD_THREADS_MAX
 570       return PTHREAD_THREADS_MAX;
 571 #else
 572       return -1;
 573 #endif
 574
 575     case _SC_THREAD_ATTR_STACKADDR:
 576 #ifdef  _POSIX_THREAD_ATTR_STACKADDR
 577       return 1;
 578 #else
 579       return -1;
 580 #endif
 581
 582     case _SC_THREAD_ATTR_STACKSIZE:
 583 #ifdef  _POSIX_THREAD_ATTR_STACKSIZE
 584       return 1;
 585 #else
 586       return -1;
 587 #endif
 588
 589     case _SC_THREAD_PRIORITY_SCHEDULING:
 590 #ifdef  _POSIX_THREAD_PRIORITY_SCHEDULING
 591       return 1;
 592 #else
 593       return -1;
 594 #endif
 595
 596     case _SC_THREAD_PRIO_INHERIT:
 597 #ifdef  _POSIX_THREAD_PRIO_INHERIT
 598       return 1;
 599 #else
 600       return -1;
 601 #endif
 602
 603     case _SC_THREAD_PRIO_PROTECT:
 604 #ifdef  _POSIX_THREAD_PRIO_PROTECT
 605       return 1;
 606 #else
 607       return -1;
 608 #endif
 609
 610     case _SC_THREAD_PROCESS_SHARED:
 611 #ifdef  _POSIX_THREAD_PROCESS_SHARED
 612       return 1;
 613 #else
 614       return -1;
 615 #endif
 616
 617     case _SC_NPROCESSORS_CONF:
 618       return __get_nprocs_conf ();
 619
 620     case _SC_NPROCESSORS_ONLN:
 621       return __get_nprocs ();
 622
 623     case _SC_PHYS_PAGES:
 624       return __get_phys_pages ();
 625
 626     case _SC_AVPHYS_PAGES:
 627       return __get_avphys_pages ();
 628
 629     case _SC_ATEXIT_MAX:
 630       /* We have no limit since we use lists.  */
 631       return INT_MAX;
 632
 633     case _SC_PASS_MAX:
 634       /* We have no limit but since the return value might be used to
 635          allocate a buffer we restrict the value.  */
 636       return BUFSIZ;
 637
 638     case _SC_XOPEN_VERSION:
 639       return _XOPEN_VERSION;
 640
 641     case _SC_XOPEN_XCU_VERSION:
 642       return _XOPEN_XCU_VERSION;
 643
 644     case _SC_XOPEN_UNIX:
 645       return _XOPEN_UNIX;
 646
 647     case _SC_XOPEN_CRYPT:
 648 #ifdef  _XOPEN_CRYPT
 649       return _XOPEN_CRYPT;
 650 #else
 651       return -1;
 652 #endif
 653
 654     case _SC_XOPEN_ENH_I18N:
 655 #ifdef  _XOPEN_ENH_I18N
 656       return _XOPEN_ENH_I18N;
 657 #else
 658       return -1;
 659 #endif
 660
 661     case _SC_XOPEN_SHM:
 662 #ifdef  _XOPEN_SHM
 663       return _XOPEN_SHM;
 664 #else
 665       return -1;
 666 #endif
 667
 668     case _SC_XOPEN_XPG2:
 669 #ifdef  _XOPEN_XPG2
 670       return _XOPEN_XPG2;
 671 #else
 672       return -1;
 673 #endif
 674
 675     case _SC_XOPEN_XPG3:
 676 #ifdef  _XOPEN_XPG3
 677       return _XOPEN_XPG3;
 678 #else
 679       return -1;
 680 #endif
 681
 682     case _SC_XOPEN_XPG4:
 683 #ifdef  _XOPEN_XPG4
 684       return _XOPEN_XPG4;
 685 #else
 686       return -1;
 687 #endif
 688
 689     case _SC_CHAR_BIT:
 690       return CHAR_BIT;
 691
 692     case _SC_CHAR_MAX:
 693       return CHAR_MAX;
 694
 695     case _SC_CHAR_MIN:
 696       return CHAR_MIN;
 697
 698     case _SC_INT_MAX:
 699       return INT_MAX;
 700
 701     case _SC_INT_MIN:
 702       return INT_MIN;
 703
 704     case _SC_LONG_BIT:
 705       return sizeof (long int) * CHAR_BIT;
 706
 707     case _SC_WORD_BIT:
 708       return sizeof (int) * CHAR_BIT;
 709
 710     case _SC_MB_LEN_MAX:
 711       return MB_LEN_MAX;
 712
 713     case _SC_NZERO:
 714       return NZERO;
 715
 716     case _SC_SSIZE_MAX:
 717       return _POSIX_SSIZE_MAX;
 718
 719     case _SC_SCHAR_MAX:
 720       return SCHAR_MAX;
 721
 722     case _SC_SCHAR_MIN:
 723       return SCHAR_MIN;
 724
 725     case _SC_SHRT_MAX:
 726       return SHRT_MAX;
 727
 728     case _SC_SHRT_MIN:
 729       return SHRT_MIN;
 730
 731     case _SC_UCHAR_MAX:
 732       return UCHAR_MAX;
 733
 734     case _SC_UINT_MAX:
 735       return UINT_MAX;
 736
 737     case _SC_ULONG_MAX:
 738       return ULONG_MAX;
 739
 740     case _SC_USHRT_MAX:
 741       return USHRT_MAX;
 742
 743     case _SC_NL_ARGMAX:
 744 #ifdef  NL_ARGMAX
 745       return NL_ARGMAX;
 746 #else
 747       return -1;
 748 #endif
 749
 750     case _SC_NL_LANGMAX:
 751 #ifdef  NL_LANGMAX
 752       return NL_LANGMAX;
 753 #else
 754       return -1;
 755 #endif
 756
 757     case _SC_NL_MSGMAX:
 758 #ifdef  NL_MSGMAX
 759       return NL_MSGMAX;
 760 #else
 761       return -1;
 762 #endif
 763
 764     case _SC_NL_NMAX:
 765 #ifdef  NL_NMAX
 766       return NL_NMAX;
 767 #else
 768       return -1;
 769 #endif
 770
 771     case _SC_NL_SETMAX:
 772 #ifdef  NL_SETMAX
 773       return NL_SETMAX;
 774 #else
 775       return -1;
 776 #endif
 777
 778     case _SC_NL_TEXTMAX:
 779 #ifdef  NL_TEXTMAX
 780       return NL_TEXTMAX;
 781 #else
 782       return -1;
 783 #endif
 784
 785     case _SC_XBS5_ILP32_OFF32:
 786 #ifdef _XBS5_ILP32_OFF32
 787       return _XBS5_ILP32_OFF32;
 788 #else
 789       return -1;
 790 #endif
 791     case _SC_XBS5_ILP32_OFFBIG:
 792 #ifdef _XBS5_ILP32_OFFBIG
 793       return _XBS5_ILP32_OFFBIG;
 794 #else
 795       return -1;
 796 #endif
 797     case _SC_XBS5_LP64_OFF64:
 798 #ifdef _XBS5_LP64_OFF64
 799       return _XBS5_LP64_OFF64;
 800 #else
 801       return -1;
 802 #endif
 803     case _SC_XBS5_LPBIG_OFFBIG:
 804 #ifdef _XBS5_LPBIG_OFFBIG
 805       return _XBS5_LPBIG_OFFBIG;
 806 #else
 807       return -1;
 808 #endif
 809
 810     case _SC_XOPEN_LEGACY:
 811       return _XOPEN_LEGACY;
 812
 813     case _SC_XOPEN_REALTIME:
 814 #ifdef _XOPEN_REALTIME
 815       return _XOPEN_REALTIME;
 816 #else
 817       return -1;
 818 #endif
 819     case _SC_XOPEN_REALTIME_THREADS:
 820 #ifdef _XOPEN_REALTIME_THREADS
 821       return _XOPEN_REALTIME_THREADS;
 822 #else
 823       return -1;
 824 #endif
 825     }
 826 }
 827
 828 weak_alias (__sysconf, sysconf)