gen/FreeBSD/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  * 4. 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
  33 #if defined(LIBC_SCCS) && !defined(lint)
  34 static char sccsid[] = "@(#)sysconf.c   8.2 (Berkeley) 3/20/94";
  35 #endif /* LIBC_SCCS and not lint */
  36 #include <sys/cdefs.h>
  37 __FBSDID("$FreeBSD: lib/libc/gen/sysconf.c r168718 $");
  38
  39 #include <sys/param.h>
  40 #include <sys/time.h>
  41 #include <sys/sysctl.h>
  42 #include <sys/resource.h>
  43 #include <sys/socket.h>
  44 #include <sys/aio.h>
  45 #include <sys/semaphore.h>
  46
  47 #include <errno.h>
  48 #include <limits.h>
  49 #include <paths.h>
  50 #include <pthread.h>            /* we just need the limits */
  51 #include <time.h>
  52 #include <unistd.h>
  53
  54 #include "../../stdlib/FreeBSD/atexit.h"
  55 #include "../../stdtime/FreeBSD/tzfile.h"
  56
  57 #define _PATH_ZONEINFO  TZDIR   /* from tzfile.h */
  58
  59 /*
  60  * sysconf --
  61  *      get configurable system variables.
  62  *
  63  * XXX
  64  * POSIX 1003.1 (ISO/IEC 9945-1, 4.8.1.3) states that the variable values
  65  * not change during the lifetime of the calling process.  This would seem
  66  * to require that any change to system limits kill all running processes.
  67  * A workaround might be to cache the values when they are first retrieved
  68  * and then simply return the cached value on subsequent calls.  This is
  69  * less useful than returning up-to-date values, however.
  70  */
  71 long
  72 sysconf(name)
  73         int name;
  74 {
  75         struct rlimit rl;
  76         quad_t qdvalue; /* for kern.sysv.shmmin */
  77         size_t len;
  78         int mib[3], sverrno, value;
  79         long lvalue, defaultresult;
  80         const char *path;
  81
  82         defaultresult = -1;
  83
  84         switch (name) {
  85         case _SC_ARG_MAX:
  86                 mib[0] = CTL_KERN;
  87                 mib[1] = KERN_ARGMAX;
  88                 break;
  89         case _SC_CHILD_MAX:
  90                 if (getrlimit(RLIMIT_NPROC, &rl) != 0)
  91                         return (-1);
  92                 if (rl.rlim_cur == RLIM_INFINITY)
  93                         return (-1);
  94                 if (rl.rlim_cur > LONG_MAX) {
  95                         errno = EOVERFLOW;
  96                         return (-1);
  97                 }
  98                 return ((long)rl.rlim_cur);
  99         case _SC_CLK_TCK:
 100                 return (CLK_TCK);
 101         case _SC_NGROUPS_MAX:
 102                 mib[0] = CTL_KERN;
 103                 mib[1] = KERN_NGROUPS;
 104                 break;
 105         case _SC_OPEN_MAX:
 106         case _SC_STREAM_MAX:    /* assume fds run out before memory does */
 107                 if (getrlimit(RLIMIT_NOFILE, &rl) != 0)
 108                         return (-1);
 109                 if (rl.rlim_cur == RLIM_INFINITY)
 110                         return (-1);
 111                 if (rl.rlim_cur > LONG_MAX) {
 112                         errno = EOVERFLOW;
 113                         return (-1);
 114                 }
 115                 return ((long)rl.rlim_cur);
 116         case _SC_JOB_CONTROL:
 117                 return (_POSIX_JOB_CONTROL);
 118         case _SC_SAVED_IDS:
 119                 /* XXX - must be 1 */
 120                 mib[0] = CTL_KERN;
 121                 mib[1] = KERN_SAVED_IDS;
 122                 goto yesno;
 123         case _SC_VERSION:
 124                 mib[0] = CTL_KERN;
 125                 mib[1] = KERN_POSIX1;
 126                 break;
 127         case _SC_BC_BASE_MAX:
 128                 return (BC_BASE_MAX);
 129         case _SC_BC_DIM_MAX:
 130                 return (BC_DIM_MAX);
 131         case _SC_BC_SCALE_MAX:
 132                 return (BC_SCALE_MAX);
 133         case _SC_BC_STRING_MAX:
 134                 return (BC_STRING_MAX);
 135         case _SC_COLL_WEIGHTS_MAX:
 136                 return (COLL_WEIGHTS_MAX);
 137         case _SC_EXPR_NEST_MAX:
 138                 return (EXPR_NEST_MAX);
 139         case _SC_LINE_MAX:
 140                 return (LINE_MAX);
 141         case _SC_RE_DUP_MAX:
 142                 return (RE_DUP_MAX);
 143         case _SC_2_VERSION:
 144                 /*
 145                  * This is something of a lie, but it would be silly at
 146                  * this point to try to deduce this from the contents
 147                  * of the filesystem.
 148                  */
 149                 return (_POSIX2_VERSION);
 150         case _SC_2_C_BIND:
 151                 return (_POSIX2_C_BIND);
 152         case _SC_2_C_DEV:
 153                 return (_POSIX2_C_DEV);
 154         case _SC_2_CHAR_TERM:
 155                 return (_POSIX2_CHAR_TERM);
 156         case _SC_2_FORT_DEV:
 157                 return (_POSIX2_FORT_DEV);
 158         case _SC_2_FORT_RUN:
 159                 return (_POSIX2_FORT_RUN);
 160         case _SC_2_LOCALEDEF:
 161                 return (_POSIX2_LOCALEDEF);
 162         case _SC_2_SW_DEV:
 163                 return (_POSIX2_SW_DEV);
 164         case _SC_2_UPE:
 165                 return (_POSIX2_UPE);
 166         case _SC_TZNAME_MAX:
 167                 path = _PATH_ZONEINFO;
 168 do_NAME_MAX:
 169                 sverrno = errno;
 170                 errno = 0;
 171                 lvalue = pathconf(path, _PC_NAME_MAX);
 172                 if (lvalue == -1 && errno != 0)
 173                         return (-1);
 174                 errno = sverrno;
 175                 return (lvalue);
 176
 177         case _SC_ASYNCHRONOUS_IO:
 178 #if _POSIX_ASYNCHRONOUS_IO == 0
 179                 mib[0] = CTL_P1003_1B;
 180                 mib[1] = CTL_P1003_1B_ASYNCHRONOUS_IO;
 181                 break;
 182 #else
 183                 return (_POSIX_ASYNCHRONOUS_IO);
 184 #endif
 185         case _SC_MAPPED_FILES:
 186                 return (_POSIX_MAPPED_FILES);
 187         case _SC_MEMLOCK:
 188                 return (_POSIX_MEMLOCK);
 189         case _SC_MEMLOCK_RANGE:
 190                 return (_POSIX_MEMLOCK_RANGE);
 191         case _SC_MEMORY_PROTECTION:
 192                 return (_POSIX_MEMORY_PROTECTION);
 193         case _SC_MESSAGE_PASSING:
 194 #if _POSIX_MESSAGE_PASSING == 0
 195                 mib[0] = CTL_P1003_1B;
 196                 mib[1] = CTL_P1003_1B_MESSAGE_PASSING;
 197                 goto yesno;
 198 #else
 199                 return (_POSIX_MESSAGE_PASSING);
 200 #endif
 201         case _SC_PRIORITIZED_IO:
 202 #if _POSIX_PRIORITIZED_IO == 0
 203                 mib[0] = CTL_P1003_1B;
 204                 mib[1] = CTL_P1003_1B_PRIORITIZED_IO;
 205                 goto yesno;
 206 #else
 207                 return (_POSIX_PRIORITIZED_IO);
 208 #endif
 209         case _SC_PRIORITY_SCHEDULING:
 210 #if _POSIX_PRIORITY_SCHEDULING == 0
 211                 mib[0] = CTL_P1003_1B;
 212                 mib[1] = CTL_P1003_1B_PRIORITY_SCHEDULING;
 213                 goto yesno;
 214 #else
 215                 return (_POSIX_PRIORITY_SCHEDULING);
 216 #endif
 217         case _SC_REALTIME_SIGNALS:
 218 #if _POSIX_REALTIME_SIGNALS == 0
 219                 mib[0] = CTL_P1003_1B;
 220                 mib[1] = CTL_P1003_1B_REALTIME_SIGNALS;
 221                 goto yesno;
 222 #else
 223                 return (_POSIX_REALTIME_SIGNALS);
 224 #endif
 225         case _SC_SEMAPHORES:
 226 #if _POSIX_SEMAPHORES == 0
 227                 mib[0] = CTL_P1003_1B;
 228                 mib[1] = CTL_P1003_1B_SEMAPHORES;
 229                 goto yesno;
 230 #else
 231                 return (_POSIX_SEMAPHORES);
 232 #endif
 233         case _SC_FSYNC:
 234                 return (_POSIX_FSYNC);
 235
 236         case _SC_SHARED_MEMORY_OBJECTS:
 237                 return (_POSIX_SHARED_MEMORY_OBJECTS);
 238         case _SC_SYNCHRONIZED_IO:
 239 #if _POSIX_SYNCHRONIZED_IO == 0
 240                 mib[0] = CTL_P1003_1B;
 241                 mib[1] = CTL_P1003_1B_SYNCHRONIZED_IO;
 242                 goto yesno;
 243 #else
 244                 return (_POSIX_SYNCHRONIZED_IO);
 245 #endif
 246         case _SC_TIMERS:
 247 #if _POSIX_TIMERS == 0
 248                 mib[0] = CTL_P1003_1B;
 249                 mib[1] = CTL_P1003_1B_TIMERS;
 250                 goto yesno;
 251 #else
 252                 return (_POSIX_TIMERS);
 253 #endif
 254         case _SC_AIO_LISTIO_MAX:
 255 #if defined(CTL_P1003_1B) && defined(CTL_P1003_1B_AIO_LISTIO_MAX)
 256                 mib[0] = CTL_P1003_1B;
 257                 mib[1] = CTL_P1003_1B_AIO_LISTIO_MAX;
 258 #else
 259                 mib[0] = CTL_KERN;;
 260                 mib[1] = KERN_AIOMAX;
 261 #endif
 262                 break;
 263         case _SC_AIO_MAX:
 264 #if defined(CTL_P1003_1B) && defined(CTL_P1003_1B_AIO_MAX)
 265                 mib[0] = CTL_P1003_1B;
 266                 mib[1] = CTL_P1003_1B_AIO_MAX;
 267 #else
 268                 mib[0] = CTL_KERN;;
 269                 mib[1] = KERN_AIOMAX;
 270 #endif
 271                 break;
 272         case _SC_AIO_PRIO_DELTA_MAX:
 273 #if defined(CTL_P1003_1B) && defined(CTL_P1003_1B_AIO_PRIO_DELTA_MAX)
 274                 mib[0] = CTL_P1003_1B;
 275                 mib[1] = CTL_P1003_1B_AIO_PRIO_DELTA_MAX;
 276                 break;
 277 #else
 278                 return (-1);
 279 #endif
 280         case _SC_DELAYTIMER_MAX:
 281 #if defined(CTL_P1003_1B) && defined(CTL_P1003_1B_DELAYTIMER_MAX)
 282                 mib[0] = CTL_P1003_1B;
 283                 mib[1] = CTL_P1003_1B_DELAYTIMER_MAX;
 284                 goto yesno;
 285 #else
 286                 return (-1);
 287 #endif
 288         case _SC_MQ_OPEN_MAX:
 289 #if defined(CTL_P1003_1B) && defined(CTL_P1003_1B_MQ_OPEN_MAX)
 290                 mib[0] = CTL_P1003_1B;
 291                 mib[1] = CTL_P1003_1B_MQ_OPEN_MAX;
 292                 goto yesno;
 293 #else
 294                 return (-1);
 295 #endif
 296         case _SC_PAGESIZE:
 297                 defaultresult = getpagesize();
 298 #if defined(CTL_P1003_1B) && defined(CTL_P1003_1B_PAGESIZE)
 299                 mib[0] = CTL_P1003_1B;
 300                 mib[1] = CTL_P1003_1B_PAGESIZE;
 301                 goto yesno;
 302 #else
 303                 return defaultresult;
 304 #endif
 305         case _SC_RTSIG_MAX:
 306 #if defined(CTL_P1003_1B) && defined(CTL_P1003_1B_RTSIG_MAX)
 307                 mib[0] = CTL_P1003_1B;
 308                 mib[1] = CTL_P1003_1B_RTSIG_MAX;
 309                 goto yesno;
 310 #else
 311                 return (-1);
 312 #endif
 313         case _SC_SEM_NSEMS_MAX:
 314 #if defined(CTL_P1003_1B) && defined(CTL_P1003_1B_RTSIG_MAX)
 315                 mib[0] = CTL_P1003_1B;
 316                 mib[1] = CTL_P1003_1B_SEM_NSEMS_MAX;
 317                 goto yesno;
 318 #else
 319                 len = sizeof(value);
 320                 return (sysctlbyname("kern.sysv.semmns", &value, &len, NULL, 0) == -1 ? -1 : value);
 321 #endif
 322
 323         case _SC_SEM_VALUE_MAX:
 324 #if SEM_VALUE_MAX == 0
 325                 mib[0] = CTL_P1003_1B;
 326                 mib[1] = CTL_P1003_1B_SEM_VALUE_MAX;
 327                 goto yesno;
 328 #else
 329                 return (SEM_VALUE_MAX);
 330 #endif
 331         case _SC_SIGQUEUE_MAX:
 332 #if defined(CTL_P1003_1B) && defined(CTL_P1003_1B_SIGQUEUE_MAX)
 333                 mib[0] = CTL_P1003_1B;
 334                 mib[1] = CTL_P1003_1B_SIGQUEUE_MAX;
 335                 goto yesno;
 336 #else
 337                 return (-1);
 338 #endif
 339         case _SC_TIMER_MAX:
 340 #if defined(CTL_P1003_1B) && defined(CTL_P1003_1B_TIMER_MAX)
 341                 mib[0] = CTL_P1003_1B;
 342                 mib[1] = CTL_P1003_1B_TIMER_MAX;
 343 #else
 344                 return (-1);
 345 #endif
 346
 347 yesno:
 348                 len = sizeof(value);
 349                 if (sysctl(mib, 2, &value, &len, NULL, 0) == -1)
 350                         return (-1);
 351                 if (value == 0)
 352                         return (defaultresult);
 353                 return ((long)value);
 354
 355         case _SC_2_PBS:
 356         case _SC_2_PBS_ACCOUNTING:
 357         case _SC_2_PBS_CHECKPOINT:
 358         case _SC_2_PBS_LOCATE:
 359         case _SC_2_PBS_MESSAGE:
 360         case _SC_2_PBS_TRACK:
 361 #if _POSIX2_PBS == 0
 362 #error "don't know how to determine _SC_2_PBS"
 363                 /*
 364                  * This probably requires digging through the filesystem
 365                  * to see if the appropriate package has been installed.
 366                  * Since we don't currently support this option at all,
 367                  * it's not worth the effort to write the code now.
 368                  * Figuring out which of the sub-options are supported
 369                  * would be even more difficult, so it's probably easier
 370                  * to always say ``no''.
 371                  */
 372 #else
 373                 return (_POSIX2_PBS);
 374 #endif
 375         case _SC_ADVISORY_INFO:
 376 #if _POSIX_ADVISORY_INFO == 0
 377 #error "_POSIX_ADVISORY_INFO"
 378 #else
 379                 return (_POSIX_ADVISORY_INFO);
 380 #endif
 381         case _SC_BARRIERS:
 382 #if _POSIX_BARRIERS == 0
 383 #error "_POSIX_BARRIERS"
 384 #else
 385                 return (_POSIX_BARRIERS);
 386 #endif
 387         case _SC_CLOCK_SELECTION:
 388 #if _POSIX_CLOCK_SELECTION == 0
 389 #error "_POSIX_CLOCK_SELECTION"
 390 #else
 391                 return (_POSIX_CLOCK_SELECTION);
 392 #endif
 393         case _SC_CPUTIME:
 394 #if _POSIX_CPUTIME == 0
 395 #error "_POSIX_CPUTIME"
 396 #else
 397                 return (_POSIX_CPUTIME);
 398 #endif
 399         case _SC_FILE_LOCKING:
 400         case _SC_GETGR_R_SIZE_MAX:
 401 /*              return sizeof(group) + group_name_max + group_passwd_max + max_group_member*(MAXLOGNAME+1); */
 402                 return 4096;    /* INT_MAX is too big for Perl */
 403         case _SC_GETPW_R_SIZE_MAX:
 404                 return 4096;
 405         case _SC_HOST_NAME_MAX:
 406                 return (MAXHOSTNAMELEN - 1); /* does not include \0 */
 407         case _SC_LOGIN_NAME_MAX:
 408                 return (MAXLOGNAME);
 409         case _SC_MONOTONIC_CLOCK:
 410 #if _POSIX_MONOTONIC_CLOCK == 0
 411 #error "_POSIX_MONOTONIC_CLOCK"
 412 #else
 413                 return (_POSIX_MONOTONIC_CLOCK);
 414 #endif
 415         case _SC_MQ_PRIO_MAX:
 416                 return (-1);
 417         case _SC_READER_WRITER_LOCKS:
 418                 return (_POSIX_READER_WRITER_LOCKS);
 419         case _SC_REGEXP:
 420                 return (_POSIX_REGEXP);
 421         case _SC_SHELL:
 422                 return (_POSIX_SHELL);
 423         case _SC_SPAWN:
 424                 return (_POSIX_SPAWN);
 425         case _SC_SPIN_LOCKS:
 426                 return (_POSIX_SPIN_LOCKS);
 427         case _SC_SPORADIC_SERVER:
 428 #if _POSIX_SPORADIC_SERVER == 0
 429 #error "_POSIX_SPORADIC_SERVER"
 430 #else
 431                 return (_POSIX_SPORADIC_SERVER);
 432 #endif
 433         case _SC_THREAD_ATTR_STACKADDR:
 434                 return (_POSIX_THREAD_ATTR_STACKADDR);
 435         case _SC_THREAD_ATTR_STACKSIZE:
 436                 return (_POSIX_THREAD_ATTR_STACKSIZE);
 437         case _SC_THREAD_CPUTIME:
 438                 return (_POSIX_THREAD_CPUTIME);
 439         case _SC_THREAD_DESTRUCTOR_ITERATIONS:
 440                 return (PTHREAD_DESTRUCTOR_ITERATIONS);
 441         case _SC_THREAD_KEYS_MAX:
 442                 return (PTHREAD_KEYS_MAX);
 443         case _SC_THREAD_PRIO_INHERIT:
 444                 return (_POSIX_THREAD_PRIO_INHERIT);
 445         case _SC_THREAD_PRIO_PROTECT:
 446                 return (_POSIX_THREAD_PRIO_PROTECT);
 447         case _SC_THREAD_PRIORITY_SCHEDULING:
 448                 return (_POSIX_THREAD_PRIORITY_SCHEDULING);
 449         case _SC_THREAD_PROCESS_SHARED:
 450                 return (_POSIX_THREAD_PROCESS_SHARED);
 451         case _SC_THREAD_SAFE_FUNCTIONS:
 452                 return (_POSIX_THREAD_SAFE_FUNCTIONS);
 453         case _SC_THREAD_SPORADIC_SERVER:
 454                 return (_POSIX_THREAD_SPORADIC_SERVER);
 455         case _SC_THREAD_STACK_MIN:
 456                 return (PTHREAD_STACK_MIN);
 457         case _SC_THREAD_THREADS_MAX:
 458 #ifdef PTHREAD_THREADS_MAX
 459                 return (PTHREAD_THREADS_MAX); /* XXX wrong type! */
 460 #else
 461                 return (-1);
 462 #endif
 463         case _SC_TIMEOUTS:
 464                 return (_POSIX_TIMEOUTS);
 465         case _SC_THREADS:
 466                 return (_POSIX_THREADS);
 467         case _SC_TRACE:
 468 #if _POSIX_TRACE == 0
 469 #error "_POSIX_TRACE"
 470                 /* While you're implementing this, also do the ones below. */
 471 #else
 472                 return (_POSIX_TRACE);
 473 #endif
 474         case _SC_TRACE_EVENT_FILTER:
 475                 return (_POSIX_TRACE_EVENT_FILTER);
 476         case _SC_TRACE_INHERIT:
 477                 return (_POSIX_TRACE_INHERIT);
 478         case _SC_TRACE_LOG:
 479                 return (_POSIX_TRACE_LOG);
 480         case _SC_TTY_NAME_MAX:
 481                 path = "/"; // should be _PATH_DEV (PR-3624562)
 482                 goto do_NAME_MAX;
 483         case _SC_TYPED_MEMORY_OBJECTS:
 484 #if _POSIX_TYPED_MEMORY_OBJECTS == 0
 485 #error "_POSIX_TYPED_MEMORY_OBJECTS"
 486 #else
 487                 return (_POSIX_TYPED_MEMORY_OBJECTS);
 488 #endif
 489         case _SC_V6_ILP32_OFF32:
 490 #if _V6_ILP32_OFF32 == 0
 491                 if (sizeof(int) * CHAR_BIT == 32 &&
 492                     sizeof(int) == sizeof(long) &&
 493                     sizeof(long) == sizeof(void *) &&
 494                     sizeof(void *) == sizeof(off_t))
 495                         return 1;
 496                 else
 497                         return -1;
 498 #else
 499                 return (_V6_ILP32_OFF32);
 500 #endif
 501         case _SC_V6_ILP32_OFFBIG:
 502 #if _V6_ILP32_OFFBIG == 0
 503                 if (sizeof(int) * CHAR_BIT == 32 &&
 504                     sizeof(int) == sizeof(long) &&
 505                     sizeof(long) == sizeof(void *) &&
 506                     sizeof(off_t) * CHAR_BIT >= 64)
 507                         return 1;
 508                 else
 509                         return -1;
 510 #else
 511                 return (_V6_ILP32_OFFBIG);
 512 #endif
 513         case _SC_V6_LP64_OFF64:
 514 #if _V6_LP64_OFF64 == 0
 515                 if (sizeof(int) * CHAR_BIT == 32 &&
 516                     sizeof(long) * CHAR_BIT == 64 &&
 517                     sizeof(long) == sizeof(void *) &&
 518                     sizeof(void *) == sizeof(off_t))
 519                         return 1;
 520                 else
 521                         return -1;
 522 #else
 523                 return (_V6_LP64_OFF64);
 524 #endif
 525         case _SC_V6_LPBIG_OFFBIG:
 526 #if _V6_LPBIG_OFFBIG == 0
 527                 if (sizeof(int) * CHAR_BIT >= 32 &&
 528                     sizeof(long) * CHAR_BIT >= 64 &&
 529                     sizeof(void *) * CHAR_BIT >= 64 &&
 530                     sizeof(off_t) * CHAR_BIT >= 64)
 531                         return 1;
 532                 else
 533                         return -1;
 534 #else
 535                 return (_V6_LPBIG_OFFBIG);
 536 #endif
 537         case _SC_ATEXIT_MAX:
 538                 return (INT_MAX);       /* unlimited */
 539         case _SC_IOV_MAX:
 540 #ifdef KERN_IOV_MAX
 541                 mib[0] = CTL_KERN;
 542                 mib[1] = KERN_IOV_MAX;
 543                 break;
 544 #else
 545                 return (IOV_MAX);
 546 #endif
 547         case _SC_XOPEN_CRYPT:
 548                 return (_XOPEN_CRYPT);
 549         case _SC_XOPEN_ENH_I18N:
 550                 return (_XOPEN_ENH_I18N);
 551         case _SC_XOPEN_LEGACY:
 552                 return (_XOPEN_LEGACY);
 553         case _SC_XOPEN_REALTIME:
 554 #if _XOPEN_REALTIME == 0
 555                 sverrno = errno;
 556                 value = sysconf(_SC_ASYNCHRONOUS_IO) > 0 &&
 557                         sysconf(_SC_MEMLOCK) > 0 &&
 558                         sysconf(_SC_MEMLOCK_RANGE) > 0 &&
 559                         sysconf(_SC_MESSAGE_PASSING) > 0 &&
 560                         sysconf(_SC_PRIORITY_SCHEDULING) > 0 &&
 561                         sysconf(_SC_REALTIME_SIGNALS) > 0 &&
 562                         sysconf(_SC_SEMAPHORES) > 0 &&
 563                         sysconf(_SC_SHARED_MEMORY_OBJECTS) > 0 &&
 564                         sysconf(_SC_SYNCHRONIZED_IO) > 0 &&
 565                         sysconf(_SC_TIMERS) > 0;
 566                 errno = sverrno;
 567                 if (value)
 568                         return (200112L);
 569                 else
 570                         return (-1);
 571 #else
 572                 return (_XOPEN_REALTIME);
 573 #endif
 574         case _SC_XOPEN_REALTIME_THREADS:
 575 #if _XOPEN_REALTIME_THREADS == 0
 576 #error "_XOPEN_REALTIME_THREADS"
 577 #else
 578                 return (_XOPEN_REALTIME_THREADS);
 579 #endif
 580         case _SC_XOPEN_SHM:
 581                 sverrno = errno;
 582                 len = sizeof(qdvalue);
 583                 if (sysctlbyname("kern.sysv.shmmin", &qdvalue, &len, NULL,
 584                     0) == -1) {
 585                         errno = sverrno;
 586                         return (-1);
 587                 }
 588                 errno = sverrno;
 589                 return (1);
 590         case _SC_XOPEN_STREAMS:
 591                 return (_XOPEN_STREAMS);
 592         case _SC_XOPEN_UNIX:
 593                 return (_XOPEN_UNIX);
 594 #ifdef _XOPEN_VERSION
 595         case _SC_XOPEN_VERSION:
 596                 return (_XOPEN_VERSION);
 597 #endif
 598 #ifdef _XOPEN_XCU_VERSION
 599         case _SC_XOPEN_XCU_VERSION:
 600                 return (_XOPEN_XCU_VERSION);
 601 #endif
 602         case _SC_SYMLOOP_MAX:
 603                 return (MAXSYMLINKS);
 604         case _SC_RAW_SOCKETS:
 605                 return (_POSIX_RAW_SOCKETS);
 606         case _SC_IPV6:
 607 #if _POSIX_IPV6 == 0
 608                 sverrno = errno;
 609                 value = socket(PF_INET6, SOCK_DGRAM, 0);
 610                 errno = sverrno;
 611                 if (value >= 0) {
 612                         close(value);
 613                         return (200112L);
 614                 } else
 615                         return (0);
 616 #else
 617                 return (_POSIX_IPV6);
 618 #endif
 619
 620 #ifdef _SC_NPROCESSORS_CONF
 621         case _SC_NPROCESSORS_CONF:
 622 #endif
 623 #ifdef _SC_NPROCESSORS_ONLN
 624         case _SC_NPROCESSORS_ONLN:
 625 #endif
 626 #if defined(_SC_NPROCESSORS_CONF) || defined(_SC_NPROCESSORS_ONLN)
 627                 mib[0] = CTL_HW;
 628                 mib[1] = HW_NCPU;
 629                 break;
 630 #endif
 631         case _SC_XBS5_ILP32_OFF32:
 632                 return (_XBS5_ILP32_OFF32);
 633         case _SC_XBS5_ILP32_OFFBIG:
 634                 return (_XBS5_ILP32_OFFBIG);
 635         case _SC_XBS5_LP64_OFF64:
 636                 return (_XBS5_LP64_OFF64);
 637         case _SC_XBS5_LPBIG_OFFBIG:
 638                 return (_XBS5_LPBIG_OFFBIG);
 639         case _SC_SS_REPL_MAX:
 640                 return (_POSIX_SS_REPL_MAX);
 641         case _SC_TRACE_EVENT_NAME_MAX:
 642                 return (_POSIX_TRACE_EVENT_NAME_MAX);
 643         case _SC_TRACE_NAME_MAX:
 644                 return (_POSIX_TRACE_NAME_MAX);
 645         case _SC_TRACE_SYS_MAX:
 646                 return (_POSIX_TRACE_SYS_MAX);
 647         case _SC_TRACE_USER_EVENT_MAX:
 648                 return (_POSIX_TRACE_USER_EVENT_MAX);
 649         case _SC_PASS_MAX:
 650                 return (PASS_MAX);
 651
 652 #ifdef _SC_PHYS_PAGES
 653         case _SC_PHYS_PAGES:
 654 #ifdef __APPLE__
 655                 {
 656                         long memsize;
 657                         long pagesize;
 658
 659                         len = sizeof(memsize);
 660                         if (sysctlbyname("hw.memsize", &memsize, &len, NULL, 0) == -1)
 661                                 return (-1);
 662
 663                         len = sizeof(pagesize);
 664                         if (sysctlbyname("hw.pagesize", &pagesize, &len, NULL, 0) == -1)
 665                                 return (-1);
 666
 667                         return (memsize / pagesize);
 668                 }
 669 #else
 670                 len = sizeof(lvalue);
 671                 if (sysctlbyname("hw.availpages", &lvalue, &len, NULL, 0) == -1)
 672                         return (-1);
 673                 return (lvalue);
 674 #endif
 675 #endif
 676
 677         default:
 678                 errno = EINVAL;
 679                 return (-1);
 680         }
 681         len = sizeof(value);
 682         if (sysctl(mib, 2, &value, &len, NULL, 0) == -1)
 683                 value = -1;
 684         return ((long)value);
 685 }