lib/libc/gen/sysconf.c

   1 /*-
   2  * Copyright (c) 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Sean Eric Fagan of Cygnus Support.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  * @(#)sysconf.c        8.2 (Berkeley) 3/20/94
  33  * $FreeBSD: src/lib/libc/gen/sysconf.c,v 1.26 2008/02/27 05:56:57 wollman Exp $
  34  */
  35
  36 #include <sys/param.h>
  37 #include <sys/time.h>
  38 #include <sys/sysctl.h>
  39 #include <sys/resource.h>
  40 #include <sys/socket.h>
  41
  42 #include <errno.h>
  43 #include <limits.h>
  44 #include <paths.h>
  45 #include <pthread.h>            /* we just need the limits */
  46 #include <time.h>
  47 #include <unistd.h>
  48
  49 #include "../stdlib/atexit.h"
  50 #include "../stdtime/tzfile.h"
  51
  52 #define _PATH_ZONEINFO  TZDIR   /* from tzfile.h */
  53
  54 /*
  55  * sysconf --
  56  *      get configurable system variables.
  57  *
  58  * XXX
  59  * POSIX 1003.1 (ISO/IEC 9945-1, 4.8.1.3) states that the variable values
  60  * not change during the lifetime of the calling process.  This would seem
  61  * to require that any change to system limits kill all running processes.
  62  * A workaround might be to cache the values when they are first retrieved
  63  * and then simply return the cached value on subsequent calls.  This is
  64  * less useful than returning up-to-date values, however.
  65  */
  66 long
  67 sysconf(int name)
  68 {
  69         struct rlimit rl;
  70         size_t len;
  71         int mib[2], sverrno, value;
  72         long lvalue, defaultresult;
  73         const char *path;
  74
  75         defaultresult = -1;
  76
  77         switch (name) {
  78         case _SC_ARG_MAX:
  79                 mib[0] = CTL_KERN;
  80                 mib[1] = KERN_ARGMAX;
  81                 break;
  82         case _SC_CHILD_MAX:
  83                 if (getrlimit(RLIMIT_NPROC, &rl) != 0)
  84                         return (-1);
  85                 if (rl.rlim_cur == RLIM_INFINITY)
  86                         return (-1);
  87                 if (rl.rlim_cur > LONG_MAX) {
  88                         errno = EOVERFLOW;
  89                         return (-1);
  90                 }
  91                 return ((long)rl.rlim_cur);
  92         case _SC_CLK_TCK:
  93                 return (CLK_TCK);
  94         case _SC_NGROUPS_MAX:
  95                 mib[0] = CTL_KERN;
  96                 mib[1] = KERN_NGROUPS;
  97                 break;
  98         case _SC_OPEN_MAX:
  99                 if (getrlimit(RLIMIT_NOFILE, &rl) != 0)
 100                         return (-1);
 101                 if (rl.rlim_cur == RLIM_INFINITY)
 102                         return (-1);
 103                 if (rl.rlim_cur > LONG_MAX) {
 104                         errno = EOVERFLOW;
 105                         return (-1);
 106                 }
 107                 return ((long)rl.rlim_cur);
 108         case _SC_STREAM_MAX:
 109                 if (getrlimit(RLIMIT_NOFILE, &rl) != 0)
 110                         return (-1);
 111                 if (rl.rlim_cur == RLIM_INFINITY)
 112                         return (-1);
 113                 if (rl.rlim_cur > LONG_MAX) {
 114                         errno = EOVERFLOW;
 115                         return (-1);
 116                 }
 117                 /*
 118                  * struct __sFILE currently has a limitation that
 119                  * file descriptors must fit in a signed short.
 120                  * This doesn't precisely capture the letter of POSIX
 121                  * but approximates the spirit.
 122                  */
 123                 if (rl.rlim_cur > SHRT_MAX)
 124                         return (SHRT_MAX);
 125
 126                 return ((long)rl.rlim_cur);
 127         case _SC_JOB_CONTROL:
 128                 return (_POSIX_JOB_CONTROL);
 129         case _SC_SAVED_IDS:
 130                 /* XXX - must be 1 */
 131                 mib[0] = CTL_KERN;
 132                 mib[1] = KERN_SAVED_IDS;
 133                 goto yesno;
 134         case _SC_VERSION:
 135                 mib[0] = CTL_KERN;
 136                 mib[1] = KERN_POSIX1;
 137                 break;
 138         case _SC_BC_BASE_MAX:
 139                 return (BC_BASE_MAX);
 140         case _SC_BC_DIM_MAX:
 141                 return (BC_DIM_MAX);
 142         case _SC_BC_SCALE_MAX:
 143                 return (BC_SCALE_MAX);
 144         case _SC_BC_STRING_MAX:
 145                 return (BC_STRING_MAX);
 146         case _SC_COLL_WEIGHTS_MAX:
 147                 return (COLL_WEIGHTS_MAX);
 148         case _SC_EXPR_NEST_MAX:
 149                 return (EXPR_NEST_MAX);
 150         case _SC_LINE_MAX:
 151                 return (LINE_MAX);
 152         case _SC_RE_DUP_MAX:
 153                 return (RE_DUP_MAX);
 154         case _SC_2_VERSION:
 155                 /*
 156                  * This is something of a lie, but it would be silly at
 157                  * this point to try to deduce this from the contents
 158                  * of the filesystem.
 159                  */
 160                 return (_POSIX2_VERSION);
 161         case _SC_2_C_BIND:
 162                 return (_POSIX2_C_BIND);
 163         case _SC_2_C_DEV:
 164                 return (_POSIX2_C_DEV);
 165         case _SC_2_CHAR_TERM:
 166                 return (_POSIX2_CHAR_TERM);
 167         case _SC_2_FORT_DEV:
 168                 return (_POSIX2_FORT_DEV);
 169         case _SC_2_FORT_RUN:
 170                 return (_POSIX2_FORT_RUN);
 171         case _SC_2_LOCALEDEF:
 172                 return (_POSIX2_LOCALEDEF);
 173         case _SC_2_SW_DEV:
 174                 return (_POSIX2_SW_DEV);
 175         case _SC_2_UPE:
 176                 return (_POSIX2_UPE);
 177         case _SC_TZNAME_MAX:
 178                 path = _PATH_ZONEINFO;
 179 do_NAME_MAX:
 180                 sverrno = errno;
 181                 errno = 0;
 182                 lvalue = pathconf(path, _PC_NAME_MAX);
 183                 if (lvalue == -1 && errno != 0)
 184                         return (-1);
 185                 errno = sverrno;
 186                 return (lvalue);
 187
 188         case _SC_ASYNCHRONOUS_IO:
 189 #if _POSIX_ASYNCHRONOUS_IO == 0
 190                 mib[0] = CTL_P1003_1B;
 191                 mib[1] = CTL_P1003_1B_ASYNCHRONOUS_IO;
 192                 break;
 193 #else
 194                 return (_POSIX_ASYNCHRONOUS_IO);
 195 #endif
 196         case _SC_MAPPED_FILES:
 197                 return (_POSIX_MAPPED_FILES);
 198         case _SC_MEMLOCK:
 199                 return (_POSIX_MEMLOCK);
 200         case _SC_MEMLOCK_RANGE:
 201                 return (_POSIX_MEMLOCK_RANGE);
 202         case _SC_MEMORY_PROTECTION:
 203                 return (_POSIX_MEMORY_PROTECTION);
 204         case _SC_MESSAGE_PASSING:
 205                 return (_POSIX_MESSAGE_PASSING);
 206         case _SC_PRIORITIZED_IO:
 207 #if _POSIX_PRIORITIZED_IO == 0
 208                 mib[0] = CTL_P1003_1B;
 209                 mib[1] = CTL_P1003_1B_PRIORITIZED_IO;
 210                 goto yesno;
 211 #else
 212                 return (_POSIX_PRIORITIZED_IO);
 213 #endif
 214         case _SC_PRIORITY_SCHEDULING:
 215 #if _POSIX_PRIORITY_SCHEDULING == 0
 216                 mib[0] = CTL_P1003_1B;
 217                 mib[1] = CTL_P1003_1B_PRIORITY_SCHEDULING;
 218                 goto yesno;
 219 #else
 220                 return (_POSIX_PRIORITY_SCHEDULING);
 221 #endif
 222         case _SC_REALTIME_SIGNALS:
 223 #if _POSIX_REALTIME_SIGNALS == 0
 224                 mib[0] = CTL_P1003_1B;
 225                 mib[1] = CTL_P1003_1B_REALTIME_SIGNALS;
 226                 goto yesno;
 227 #else
 228                 return (_POSIX_REALTIME_SIGNALS);
 229 #endif
 230         case _SC_SEMAPHORES:
 231 #if _POSIX_SEMAPHORES == 0
 232                 mib[0] = CTL_P1003_1B;
 233                 mib[1] = CTL_P1003_1B_SEMAPHORES;
 234                 goto yesno;
 235 #else
 236                 return (_POSIX_SEMAPHORES);
 237 #endif
 238         case _SC_FSYNC:
 239                 return (_POSIX_FSYNC);
 240
 241         case _SC_SHARED_MEMORY_OBJECTS:
 242                 return (_POSIX_SHARED_MEMORY_OBJECTS);
 243         case _SC_SYNCHRONIZED_IO:
 244 #if _POSIX_SYNCHRONIZED_IO == 0
 245                 mib[0] = CTL_P1003_1B;
 246                 mib[1] = CTL_P1003_1B_SYNCHRONIZED_IO;
 247                 goto yesno;
 248 #else
 249                 return (_POSIX_SYNCHRONIZED_IO);
 250 #endif
 251         case _SC_TIMERS:
 252 #if _POSIX_TIMERS == 0
 253                 mib[0] = CTL_P1003_1B;
 254                 mib[1] = CTL_P1003_1B_TIMERS;
 255                 goto yesno;
 256 #else
 257                 return (_POSIX_TIMERS);
 258 #endif
 259         case _SC_AIO_LISTIO_MAX:
 260                 mib[0] = CTL_P1003_1B;
 261                 mib[1] = CTL_P1003_1B_AIO_LISTIO_MAX;
 262                 break;
 263         case _SC_AIO_MAX:
 264                 mib[0] = CTL_P1003_1B;
 265                 mib[1] = CTL_P1003_1B_AIO_MAX;
 266                 break;
 267         case _SC_AIO_PRIO_DELTA_MAX:
 268                 mib[0] = CTL_P1003_1B;
 269                 mib[1] = CTL_P1003_1B_AIO_PRIO_DELTA_MAX;
 270                 break;
 271         case _SC_DELAYTIMER_MAX:
 272                 mib[0] = CTL_P1003_1B;
 273                 mib[1] = CTL_P1003_1B_DELAYTIMER_MAX;
 274                 goto yesno;
 275         case _SC_PAGESIZE:
 276                 defaultresult = getpagesize();
 277                 mib[0] = CTL_P1003_1B;
 278                 mib[1] = CTL_P1003_1B_PAGESIZE;
 279                 goto yesno;
 280         case _SC_RTSIG_MAX:
 281                 mib[0] = CTL_P1003_1B;
 282                 mib[1] = CTL_P1003_1B_RTSIG_MAX;
 283                 goto yesno;
 284         case _SC_SEM_NSEMS_MAX:
 285                 mib[0] = CTL_P1003_1B;
 286                 mib[1] = CTL_P1003_1B_SEM_NSEMS_MAX;
 287                 goto yesno;
 288         case _SC_SEM_VALUE_MAX:
 289                 mib[0] = CTL_P1003_1B;
 290                 mib[1] = CTL_P1003_1B_SEM_VALUE_MAX;
 291                 goto yesno;
 292         case _SC_SIGQUEUE_MAX:
 293                 mib[0] = CTL_P1003_1B;
 294                 mib[1] = CTL_P1003_1B_SIGQUEUE_MAX;
 295                 goto yesno;
 296         case _SC_TIMER_MAX:
 297                 mib[0] = CTL_P1003_1B;
 298                 mib[1] = CTL_P1003_1B_TIMER_MAX;
 299 yesno:
 300                 len = sizeof(value);
 301                 if (sysctl(mib, 2, &value, &len, NULL, 0) == -1)
 302                         return (-1);
 303                 if (value == 0)
 304                         return (defaultresult);
 305                 return ((long)value);
 306
 307         case _SC_2_PBS:
 308         case _SC_2_PBS_ACCOUNTING:
 309         case _SC_2_PBS_CHECKPOINT:
 310         case _SC_2_PBS_LOCATE:
 311         case _SC_2_PBS_MESSAGE:
 312         case _SC_2_PBS_TRACK:
 313 #if _POSIX2_PBS == 0
 314 #error "don't know how to determine _SC_2_PBS"
 315                 /*
 316                  * This probably requires digging through the filesystem
 317                  * to see if the appropriate package has been installed.
 318                  * Since we don't currently support this option at all,
 319                  * it's not worth the effort to write the code now.
 320                  * Figuring out which of the sub-options are supported
 321                  * would be even more difficult, so it's probably easier
 322                  * to always say ``no''.
 323                  */
 324 #else
 325                 return (_POSIX2_PBS);
 326 #endif
 327         case _SC_ADVISORY_INFO:
 328 #if _POSIX_ADVISORY_INFO == 0
 329 #error "_POSIX_ADVISORY_INFO"
 330 #else
 331                 return (_POSIX_ADVISORY_INFO);
 332 #endif
 333         case _SC_BARRIERS:
 334 #if _POSIX_BARRIERS == 0
 335 #error "_POSIX_BARRIERS"
 336 #else
 337                 return (_POSIX_BARRIERS);
 338 #endif
 339         case _SC_CLOCK_SELECTION:
 340 #if _POSIX_CLOCK_SELECTION == 0
 341 #error "_POSIX_CLOCK_SELECTION"
 342 #else
 343                 return (_POSIX_CLOCK_SELECTION);
 344 #endif
 345         case _SC_CPUTIME:
 346 #if _POSIX_CPUTIME == 0
 347 #error "_POSIX_CPUTIME"
 348 #else
 349                 return (_POSIX_CPUTIME);
 350 #endif
 351 #ifdef notdef
 352         case _SC_FILE_LOCKING:
 353                 /*
 354                  * XXX - The standard doesn't tell us how to define
 355                  * _POSIX_FILE_LOCKING, so we can't answer this one.
 356                  */
 357 #endif
 358 #if _POSIX_THREAD_SAFE_FUNCTIONS > -1
 359         case _SC_GETGR_R_SIZE_MAX:
 360         case _SC_GETPW_R_SIZE_MAX:
 361 #error "somebody needs to implement this"
 362 #endif
 363         case _SC_HOST_NAME_MAX:
 364                 return (MAXHOSTNAMELEN - 1); /* does not include \0 */
 365         case _SC_LOGIN_NAME_MAX:
 366                 return (MAXLOGNAME);
 367         case _SC_MONOTONIC_CLOCK:
 368 #if _POSIX_MONOTONIC_CLOCK == 0
 369 #error "_POSIX_MONOTONIC_CLOCK"
 370 #else
 371                 return (_POSIX_MONOTONIC_CLOCK);
 372 #endif
 373         case _SC_MQ_OPEN_MAX:
 374                 len = sizeof(lvalue);
 375                 if (sysctlbyname("kern.mqueue.mq_open_max", &lvalue, &len,
 376                         NULL, 0) == -1)
 377                         return (-1);
 378                 return (lvalue);
 379
 380         case _SC_MQ_PRIO_MAX:
 381                 len = sizeof(lvalue);
 382                 if (sysctlbyname("kern.mqueue.mq_prio_max", &lvalue, &len,
 383                         NULL, 0) == -1)
 384                         return (-1);
 385                 return (lvalue);
 386
 387         case _SC_READER_WRITER_LOCKS:
 388                 return (_POSIX_READER_WRITER_LOCKS);
 389         case _SC_REGEXP:
 390                 return (_POSIX_REGEXP);
 391         case _SC_SHELL:
 392                 return (_POSIX_SHELL);
 393         case _SC_SPAWN:
 394                 return (_POSIX_SPAWN);
 395         case _SC_SPIN_LOCKS:
 396                 return (_POSIX_SPIN_LOCKS);
 397         case _SC_SPORADIC_SERVER:
 398 #if _POSIX_SPORADIC_SERVER == 0
 399 #error "_POSIX_SPORADIC_SERVER"
 400 #else
 401                 return (_POSIX_SPORADIC_SERVER);
 402 #endif
 403         case _SC_THREAD_ATTR_STACKADDR:
 404                 return (_POSIX_THREAD_ATTR_STACKADDR);
 405         case _SC_THREAD_ATTR_STACKSIZE:
 406                 return (_POSIX_THREAD_ATTR_STACKSIZE);
 407         case _SC_THREAD_CPUTIME:
 408                 return (_POSIX_THREAD_CPUTIME);
 409         case _SC_THREAD_DESTRUCTOR_ITERATIONS:
 410                 return (PTHREAD_DESTRUCTOR_ITERATIONS);
 411         case _SC_THREAD_KEYS_MAX:
 412                 return (PTHREAD_KEYS_MAX);
 413         case _SC_THREAD_PRIO_INHERIT:
 414                 return (_POSIX_THREAD_PRIO_INHERIT);
 415         case _SC_THREAD_PRIO_PROTECT:
 416                 return (_POSIX_THREAD_PRIO_PROTECT);
 417         case _SC_THREAD_PRIORITY_SCHEDULING:
 418                 return (_POSIX_THREAD_PRIORITY_SCHEDULING);
 419         case _SC_THREAD_PROCESS_SHARED:
 420                 return (_POSIX_THREAD_PROCESS_SHARED);
 421         case _SC_THREAD_SAFE_FUNCTIONS:
 422                 return (_POSIX_THREAD_SAFE_FUNCTIONS);
 423         case _SC_THREAD_STACK_MIN:
 424                 return (PTHREAD_STACK_MIN);
 425         case _SC_THREAD_THREADS_MAX:
 426                 return (PTHREAD_THREADS_MAX); /* XXX wrong type! */
 427         case _SC_TIMEOUTS:
 428                 return (_POSIX_TIMEOUTS);
 429         case _SC_THREADS:
 430                 return (_POSIX_THREADS);
 431         case _SC_TRACE:
 432 #if _POSIX_TRACE == 0
 433 #error "_POSIX_TRACE"
 434                 /* While you're implementing this, also do the ones below. */
 435 #else
 436                 return (_POSIX_TRACE);
 437 #endif
 438 #if _POSIX_TRACE > -1
 439         case _SC_TRACE_EVENT_FILTER:
 440                 return (_POSIX_TRACE_EVENT_FILTER);
 441         case _SC_TRACE_INHERIT:
 442                 return (_POSIX_TRACE_INHERIT);
 443         case _SC_TRACE_LOG:
 444                 return (_POSIX_TRACE_LOG);
 445 #endif
 446         case _SC_TTY_NAME_MAX:
 447                 path = _PATH_DEV;
 448                 goto do_NAME_MAX;
 449         case _SC_TYPED_MEMORY_OBJECTS:
 450 #if _POSIX_TYPED_MEMORY_OBJECTS == 0
 451 #error "_POSIX_TYPED_MEMORY_OBJECTS"
 452 #else
 453                 return (_POSIX_TYPED_MEMORY_OBJECTS);
 454 #endif
 455         case _SC_V6_ILP32_OFF32:
 456 #if _V6_ILP32_OFF32 == 0
 457                 if (sizeof(int) * CHAR_BIT == 32 &&
 458                     sizeof(int) == sizeof(long) &&
 459                     sizeof(long) == sizeof(void *) &&
 460                     sizeof(void *) == sizeof(off_t))
 461                         return 1;
 462                 else
 463                         return -1;
 464 #else
 465                 return (_V6_ILP32_OFF32);
 466 #endif
 467         case _SC_V6_ILP32_OFFBIG:
 468 #if _V6_ILP32_OFFBIG == 0
 469                 if (sizeof(int) * CHAR_BIT == 32 &&
 470                     sizeof(int) == sizeof(long) &&
 471                     sizeof(long) == sizeof(void *) &&
 472                     sizeof(off_t) * CHAR_BIT >= 64)
 473                         return 1;
 474                 else
 475                         return -1;
 476 #else
 477                 return (_V6_ILP32_OFFBIG);
 478 #endif
 479         case _SC_V6_LP64_OFF64:
 480 #if _V6_LP64_OFF64 == 0
 481                 if (sizeof(int) * CHAR_BIT == 32 &&
 482                     sizeof(long) * CHAR_BIT == 64 &&
 483                     sizeof(long) == sizeof(void *) &&
 484                     sizeof(void *) == sizeof(off_t))
 485                         return 1;
 486                 else
 487                         return -1;
 488 #else
 489                 return (_V6_LP64_OFF64);
 490 #endif
 491         case _SC_V6_LPBIG_OFFBIG:
 492 #if _V6_LPBIG_OFFBIG == 0
 493                 if (sizeof(int) * CHAR_BIT >= 32 &&
 494                     sizeof(long) * CHAR_BIT >= 64 &&
 495                     sizeof(void *) * CHAR_BIT >= 64 &&
 496                     sizeof(off_t) * CHAR_BIT >= 64)
 497                         return 1;
 498                 else
 499                         return -1;
 500 #else
 501                 return (_V6_LPBIG_OFFBIG);
 502 #endif
 503         case _SC_V7_ILP32_OFF32:
 504 #if _V7_ILP32_OFF32 == 0
 505                 if (sizeof(int) * CHAR_BIT == 32 &&
 506                     sizeof(int) == sizeof(long) &&
 507                     sizeof(long) == sizeof(void *) &&
 508                     sizeof(void *) == sizeof(off_t))
 509                         return 1;
 510                 else
 511                         return -1;
 512 #else
 513                 return (_V7_ILP32_OFF32);
 514 #endif
 515         case _SC_V7_ILP32_OFFBIG:
 516 #if _V7_ILP32_OFFBIG == 0
 517                 if (sizeof(int) * CHAR_BIT == 32 &&
 518                     sizeof(int) == sizeof(long) &&
 519                     sizeof(long) == sizeof(void *) &&
 520                     sizeof(off_t) * CHAR_BIT >= 64)
 521                         return 1;
 522                 else
 523                         return -1;
 524 #else
 525                 return (_V7_ILP32_OFFBIG);
 526 #endif
 527         case _SC_V7_LP64_OFF64:
 528 #if _V7_LP64_OFF64 == 0
 529                 if (sizeof(int) * CHAR_BIT == 32 &&
 530                     sizeof(long) * CHAR_BIT == 64 &&
 531                     sizeof(long) == sizeof(void *) &&
 532                     sizeof(void *) == sizeof(off_t))
 533                         return 1;
 534                 else
 535                         return -1;
 536 #else
 537                 return (_V7_LP64_OFF64);
 538 #endif
 539         case _SC_V7_LPBIG_OFFBIG:
 540 #if _V7_LPBIG_OFFBIG == 0
 541                 if (sizeof(int) * CHAR_BIT >= 32 &&
 542                     sizeof(long) * CHAR_BIT >= 64 &&
 543                     sizeof(void *) * CHAR_BIT >= 64 &&
 544                     sizeof(off_t) * CHAR_BIT >= 64)
 545                         return 1;
 546                 else
 547                         return -1;
 548 #else
 549                 return (_V7_LPBIG_OFFBIG);
 550 #endif
 551         case _SC_ATEXIT_MAX:
 552                 return (ATEXIT_SIZE);
 553         case _SC_IOV_MAX:
 554                 mib[0] = CTL_KERN;
 555                 mib[1] = KERN_IOV_MAX;
 556                 break;
 557         case _SC_XOPEN_CRYPT:
 558                 return (_XOPEN_CRYPT);
 559         case _SC_XOPEN_ENH_I18N:
 560                 return (_XOPEN_ENH_I18N);
 561         case _SC_XOPEN_LEGACY:
 562                 return (_XOPEN_LEGACY);
 563         case _SC_XOPEN_REALTIME:
 564 #if _XOPEN_REALTIME == 0
 565                 sverrno = errno;
 566                 value = sysconf(_SC_ASYNCHRONOUS_IO) > 0 &&
 567                         sysconf(_SC_MEMLOCK) > 0 &&
 568                         sysconf(_SC_MEMLOCK_RANGE) > 0 &&
 569                         sysconf(_SC_MESSAGE_PASSING) > 0 &&
 570                         sysconf(_SC_PRIORITY_SCHEDULING) > 0 &&
 571                         sysconf(_SC_REALTIME_SIGNALS) > 0 &&
 572                         sysconf(_SC_SEMAPHORES) > 0 &&
 573                         sysconf(_SC_SHARED_MEMORY_OBJECTS) > 0 &&
 574                         sysconf(_SC_SYNCHRONIZED_IO) > 0 &&
 575                         sysconf(_SC_TIMERS) > 0;
 576                 errno = sverrno;
 577                 if (value)
 578                         return (200112L);
 579                 else
 580                         return (-1);
 581 #else
 582                 return (_XOPEN_REALTIME);
 583 #endif
 584         case _SC_XOPEN_REALTIME_THREADS:
 585 #if _XOPEN_REALTIME_THREADS == 0
 586 #error "_XOPEN_REALTIME_THREADS"
 587 #else
 588                 return (_XOPEN_REALTIME_THREADS);
 589 #endif
 590         case _SC_XOPEN_SHM:
 591                 len = sizeof(lvalue);
 592                 sverrno = errno;
 593                 if (sysctlbyname("kern.ipc.shmmin", &lvalue, &len, NULL,
 594                     0) == -1) {
 595                         errno = sverrno;
 596                         return (-1);
 597                 }
 598                 errno = sverrno;
 599                 return (1);
 600         case _SC_XOPEN_STREAMS:
 601                 return (_XOPEN_STREAMS);
 602         case _SC_XOPEN_UNIX:
 603                 return (_XOPEN_UNIX);
 604 #ifdef _XOPEN_VERSION
 605         case _SC_XOPEN_VERSION:
 606                 return (_XOPEN_VERSION);
 607 #endif
 608 #ifdef _XOPEN_XCU_VERSION
 609         case _SC_XOPEN_XCU_VERSION:
 610                 return (_XOPEN_XCU_VERSION);
 611 #endif
 612         case _SC_SYMLOOP_MAX:
 613                 return (MAXSYMLINKS);
 614         case _SC_RAW_SOCKETS:
 615                 return (_POSIX_RAW_SOCKETS);
 616         case _SC_IPV6:
 617 #if _POSIX_IPV6 == 0
 618                 sverrno = errno;
 619                 value = socket(PF_INET6, SOCK_DGRAM, 0);
 620                 errno = sverrno;
 621                 if (value >= 0) {
 622                         close(value);
 623                         return (200112L);
 624                 } else
 625                         return (0);
 626 #else
 627                 return (_POSIX_IPV6);
 628 #endif
 629
 630         case _SC_NPROCESSORS_CONF:
 631         case _SC_NPROCESSORS_ONLN:
 632                 mib[0] = CTL_HW;
 633                 mib[1] = HW_NCPU;
 634                 break;
 635
 636 #ifdef _SC_PHYS_PAGES
 637         case _SC_PHYS_PAGES:
 638                 len = sizeof(lvalue);
 639                 if (sysctlbyname("hw.availpages", &lvalue, &len, NULL, 0) == -1)
 640                         return (-1);
 641                 return (lvalue);
 642 #endif
 643
 644         default:
 645                 errno = EINVAL;
 646                 return (-1);
 647         }
 648         len = sizeof(value);
 649         if (sysctl(mib, 2, &value, &len, NULL, 0) == -1)
 650                 value = -1;
 651         return ((long)value);
 652 }