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 <semaphore.h> 47 #include <time.h> 48 #include <unistd.h> 49 50 #include "../stdlib/atexit.h" 51 #include "../stdtime/tzfile.h" 52 53 #define _PATH_ZONEINFO TZDIR /* from tzfile.h */ 54 55 /* 56 * sysconf -- 57 * get configurable system variables. 58 * 59 * XXX 60 * POSIX 1003.1 (ISO/IEC 9945-1, 4.8.1.3) states that the variable values 61 * not change during the lifetime of the calling process. This would seem 62 * to require that any change to system limits kill all running processes. 63 * A workaround might be to cache the values when they are first retrieved 64 * and then simply return the cached value on subsequent calls. This is 65 * less useful than returning up-to-date values, however. 66 */ 67 long 68 sysconf(int name) 69 { 70 struct rlimit rl; 71 size_t len; 72 int mib[2], sverrno, value; 73 long lvalue, defaultresult; 74 const char *path; 75 76 defaultresult = -1; 77 78 switch (name) { 79 case _SC_ARG_MAX: 80 mib[0] = CTL_KERN; 81 mib[1] = KERN_ARGMAX; 82 break; 83 case _SC_CHILD_MAX: 84 if (getrlimit(RLIMIT_NPROC, &rl) != 0) 85 return (-1); 86 if (rl.rlim_cur == RLIM_INFINITY) 87 return (-1); 88 if (rl.rlim_cur > LONG_MAX) { 89 errno = EOVERFLOW; 90 return (-1); 91 } 92 return ((long)rl.rlim_cur); 93 case _SC_CLK_TCK: 94 return (CLK_TCK); 95 case _SC_NGROUPS_MAX: 96 mib[0] = CTL_KERN; 97 mib[1] = KERN_NGROUPS; 98 break; 99 case _SC_OPEN_MAX: 100 if (getrlimit(RLIMIT_NOFILE, &rl) != 0) 101 return (-1); 102 if (rl.rlim_cur == RLIM_INFINITY) 103 return (-1); 104 if (rl.rlim_cur > LONG_MAX) { 105 errno = EOVERFLOW; 106 return (-1); 107 } 108 return ((long)rl.rlim_cur); 109 case _SC_SEM_VALUE_MAX: 110 return (SEM_VALUE_MAX); 111 case _SC_STREAM_MAX: 112 if (getrlimit(RLIMIT_NOFILE, &rl) != 0) 113 return (-1); 114 if (rl.rlim_cur == RLIM_INFINITY) 115 return (-1); 116 if (rl.rlim_cur > LONG_MAX) { 117 errno = EOVERFLOW; 118 return (-1); 119 } 120 /* 121 * struct __sFILE currently has a limitation that 122 * file descriptors must fit in a signed short. 123 * This doesn't precisely capture the letter of POSIX 124 * but approximates the spirit. 125 */ 126 if (rl.rlim_cur > SHRT_MAX) 127 return (SHRT_MAX); 128 129 return ((long)rl.rlim_cur); 130 case _SC_JOB_CONTROL: 131 return (_POSIX_JOB_CONTROL); 132 case _SC_SAVED_IDS: 133 /* XXX - must be 1 */ 134 mib[0] = CTL_KERN; 135 mib[1] = KERN_SAVED_IDS; 136 goto yesno; 137 case _SC_VERSION: 138 mib[0] = CTL_KERN; 139 mib[1] = KERN_POSIX1; 140 break; 141 case _SC_BC_BASE_MAX: 142 return (BC_BASE_MAX); 143 case _SC_BC_DIM_MAX: 144 return (BC_DIM_MAX); 145 case _SC_BC_SCALE_MAX: 146 return (BC_SCALE_MAX); 147 case _SC_BC_STRING_MAX: 148 return (BC_STRING_MAX); 149 case _SC_COLL_WEIGHTS_MAX: 150 return (COLL_WEIGHTS_MAX); 151 case _SC_EXPR_NEST_MAX: 152 return (EXPR_NEST_MAX); 153 case _SC_LINE_MAX: 154 return (LINE_MAX); 155 case _SC_RE_DUP_MAX: 156 return (RE_DUP_MAX); 157 case _SC_2_VERSION: 158 /* 159 * This is something of a lie, but it would be silly at 160 * this point to try to deduce this from the contents 161 * of the filesystem. 162 */ 163 return (_POSIX2_VERSION); 164 case _SC_2_C_BIND: 165 return (_POSIX2_C_BIND); 166 case _SC_2_C_DEV: 167 return (_POSIX2_C_DEV); 168 case _SC_2_CHAR_TERM: 169 return (_POSIX2_CHAR_TERM); 170 case _SC_2_FORT_DEV: 171 return (_POSIX2_FORT_DEV); 172 case _SC_2_FORT_RUN: 173 return (_POSIX2_FORT_RUN); 174 case _SC_2_LOCALEDEF: 175 return (_POSIX2_LOCALEDEF); 176 case _SC_2_SW_DEV: 177 return (_POSIX2_SW_DEV); 178 case _SC_2_UPE: 179 return (_POSIX2_UPE); 180 case _SC_TZNAME_MAX: 181 path = _PATH_ZONEINFO; 182 do_NAME_MAX: 183 sverrno = errno; 184 errno = 0; 185 lvalue = pathconf(path, _PC_NAME_MAX); 186 if (lvalue == -1 && errno != 0) 187 return (-1); 188 errno = sverrno; 189 return (lvalue); 190 191 case _SC_ASYNCHRONOUS_IO: 192 #if _POSIX_ASYNCHRONOUS_IO == 0 193 mib[0] = CTL_P1003_1B; 194 mib[1] = CTL_P1003_1B_ASYNCHRONOUS_IO; 195 break; 196 #else 197 return (_POSIX_ASYNCHRONOUS_IO); 198 #endif 199 case _SC_MAPPED_FILES: 200 return (_POSIX_MAPPED_FILES); 201 case _SC_MEMLOCK: 202 return (_POSIX_MEMLOCK); 203 case _SC_MEMLOCK_RANGE: 204 return (_POSIX_MEMLOCK_RANGE); 205 case _SC_MEMORY_PROTECTION: 206 return (_POSIX_MEMORY_PROTECTION); 207 case _SC_MESSAGE_PASSING: 208 return (_POSIX_MESSAGE_PASSING); 209 case _SC_PRIORITIZED_IO: 210 #if _POSIX_PRIORITIZED_IO == 0 211 mib[0] = CTL_P1003_1B; 212 mib[1] = CTL_P1003_1B_PRIORITIZED_IO; 213 goto yesno; 214 #else 215 return (_POSIX_PRIORITIZED_IO); 216 #endif 217 case _SC_PRIORITY_SCHEDULING: 218 #if _POSIX_PRIORITY_SCHEDULING == 0 219 mib[0] = CTL_P1003_1B; 220 mib[1] = CTL_P1003_1B_PRIORITY_SCHEDULING; 221 goto yesno; 222 #else 223 return (_POSIX_PRIORITY_SCHEDULING); 224 #endif 225 case _SC_REALTIME_SIGNALS: 226 #if _POSIX_REALTIME_SIGNALS == 0 227 mib[0] = CTL_P1003_1B; 228 mib[1] = CTL_P1003_1B_REALTIME_SIGNALS; 229 goto yesno; 230 #else 231 return (_POSIX_REALTIME_SIGNALS); 232 #endif 233 case _SC_SEMAPHORES: 234 #if _POSIX_SEMAPHORES == 0 235 mib[0] = CTL_P1003_1B; 236 mib[1] = CTL_P1003_1B_SEMAPHORES; 237 goto yesno; 238 #else 239 return (_POSIX_SEMAPHORES); 240 #endif 241 case _SC_FSYNC: 242 return (_POSIX_FSYNC); 243 244 case _SC_SHARED_MEMORY_OBJECTS: 245 return (_POSIX_SHARED_MEMORY_OBJECTS); 246 case _SC_SYNCHRONIZED_IO: 247 #if _POSIX_SYNCHRONIZED_IO == 0 248 mib[0] = CTL_P1003_1B; 249 mib[1] = CTL_P1003_1B_SYNCHRONIZED_IO; 250 goto yesno; 251 #else 252 return (_POSIX_SYNCHRONIZED_IO); 253 #endif 254 case _SC_TIMERS: 255 #if _POSIX_TIMERS == 0 256 mib[0] = CTL_P1003_1B; 257 mib[1] = CTL_P1003_1B_TIMERS; 258 goto yesno; 259 #else 260 return (_POSIX_TIMERS); 261 #endif 262 case _SC_AIO_LISTIO_MAX: 263 mib[0] = CTL_P1003_1B; 264 mib[1] = CTL_P1003_1B_AIO_LISTIO_MAX; 265 break; 266 case _SC_AIO_MAX: 267 mib[0] = CTL_P1003_1B; 268 mib[1] = CTL_P1003_1B_AIO_MAX; 269 break; 270 case _SC_AIO_PRIO_DELTA_MAX: 271 mib[0] = CTL_P1003_1B; 272 mib[1] = CTL_P1003_1B_AIO_PRIO_DELTA_MAX; 273 break; 274 case _SC_DELAYTIMER_MAX: 275 mib[0] = CTL_P1003_1B; 276 mib[1] = CTL_P1003_1B_DELAYTIMER_MAX; 277 goto yesno; 278 case _SC_PAGESIZE: 279 defaultresult = getpagesize(); 280 mib[0] = CTL_P1003_1B; 281 mib[1] = CTL_P1003_1B_PAGESIZE; 282 goto yesno; 283 case _SC_RTSIG_MAX: 284 mib[0] = CTL_P1003_1B; 285 mib[1] = CTL_P1003_1B_RTSIG_MAX; 286 goto yesno; 287 case _SC_SEM_NSEMS_MAX: 288 mib[0] = CTL_P1003_1B; 289 mib[1] = CTL_P1003_1B_SEM_NSEMS_MAX; 290 goto yesno; 291 case _SC_SIGQUEUE_MAX: 292 mib[0] = CTL_P1003_1B; 293 mib[1] = CTL_P1003_1B_SIGQUEUE_MAX; 294 goto yesno; 295 case _SC_TIMER_MAX: 296 mib[0] = CTL_P1003_1B; 297 mib[1] = CTL_P1003_1B_TIMER_MAX; 298 yesno: 299 len = sizeof(value); 300 if (sysctl(mib, 2, &value, &len, NULL, 0) == -1) 301 return (-1); 302 if (value == 0) 303 return (defaultresult); 304 return ((long)value); 305 306 case _SC_2_PBS: 307 case _SC_2_PBS_ACCOUNTING: 308 case _SC_2_PBS_CHECKPOINT: 309 case _SC_2_PBS_LOCATE: 310 case _SC_2_PBS_MESSAGE: 311 case _SC_2_PBS_TRACK: 312 #if _POSIX2_PBS == 0 313 #error "don't know how to determine _SC_2_PBS" 314 /* 315 * This probably requires digging through the filesystem 316 * to see if the appropriate package has been installed. 317 * Since we don't currently support this option at all, 318 * it's not worth the effort to write the code now. 319 * Figuring out which of the sub-options are supported 320 * would be even more difficult, so it's probably easier 321 * to always say ``no''. 322 */ 323 #else 324 return (_POSIX2_PBS); 325 #endif 326 case _SC_ADVISORY_INFO: 327 #if _POSIX_ADVISORY_INFO == 0 328 #error "_POSIX_ADVISORY_INFO" 329 #else 330 return (_POSIX_ADVISORY_INFO); 331 #endif 332 case _SC_BARRIERS: 333 #if _POSIX_BARRIERS == 0 334 #error "_POSIX_BARRIERS" 335 #else 336 return (_POSIX_BARRIERS); 337 #endif 338 case _SC_CLOCK_SELECTION: 339 #if _POSIX_CLOCK_SELECTION == 0 340 #error "_POSIX_CLOCK_SELECTION" 341 #else 342 return (_POSIX_CLOCK_SELECTION); 343 #endif 344 case _SC_CPUTIME: 345 #if _POSIX_CPUTIME == 0 346 #error "_POSIX_CPUTIME" 347 #else 348 return (_POSIX_CPUTIME); 349 #endif 350 #ifdef notdef 351 case _SC_FILE_LOCKING: 352 /* 353 * XXX - The standard doesn't tell us how to define 354 * _POSIX_FILE_LOCKING, so we can't answer this one. 355 */ 356 #endif 357 case _SC_GETGR_R_SIZE_MAX: 358 case _SC_GETPW_R_SIZE_MAX: 359 return (-1); 360 case _SC_HOST_NAME_MAX: 361 return (MAXHOSTNAMELEN - 1); /* does not include \0 */ 362 case _SC_LOGIN_NAME_MAX: 363 return (MAXLOGNAME); 364 case _SC_MONOTONIC_CLOCK: 365 #if _POSIX_MONOTONIC_CLOCK == 0 366 #error "_POSIX_MONOTONIC_CLOCK" 367 #else 368 return (_POSIX_MONOTONIC_CLOCK); 369 #endif 370 case _SC_MQ_OPEN_MAX: 371 len = sizeof(lvalue); 372 if (sysctlbyname("kern.mqueue.mq_open_max", &lvalue, &len, 373 NULL, 0) == -1) 374 return (-1); 375 return (lvalue); 376 377 case _SC_MQ_PRIO_MAX: 378 len = sizeof(lvalue); 379 if (sysctlbyname("kern.mqueue.mq_prio_max", &lvalue, &len, 380 NULL, 0) == -1) 381 return (-1); 382 return (lvalue); 383 384 case _SC_READER_WRITER_LOCKS: 385 return (_POSIX_READER_WRITER_LOCKS); 386 case _SC_REGEXP: 387 return (_POSIX_REGEXP); 388 case _SC_SHELL: 389 return (_POSIX_SHELL); 390 case _SC_SPAWN: 391 return (_POSIX_SPAWN); 392 case _SC_SPIN_LOCKS: 393 return (_POSIX_SPIN_LOCKS); 394 case _SC_SPORADIC_SERVER: 395 #if _POSIX_SPORADIC_SERVER == 0 396 #error "_POSIX_SPORADIC_SERVER" 397 #else 398 return (_POSIX_SPORADIC_SERVER); 399 #endif 400 case _SC_THREAD_ATTR_STACKADDR: 401 return (_POSIX_THREAD_ATTR_STACKADDR); 402 case _SC_THREAD_ATTR_STACKSIZE: 403 return (_POSIX_THREAD_ATTR_STACKSIZE); 404 case _SC_THREAD_CPUTIME: 405 return (_POSIX_THREAD_CPUTIME); 406 case _SC_THREAD_DESTRUCTOR_ITERATIONS: 407 return (PTHREAD_DESTRUCTOR_ITERATIONS); 408 case _SC_THREAD_KEYS_MAX: 409 return (PTHREAD_KEYS_MAX); 410 case _SC_THREAD_PRIO_INHERIT: 411 return (_POSIX_THREAD_PRIO_INHERIT); 412 case _SC_THREAD_PRIO_PROTECT: 413 return (_POSIX_THREAD_PRIO_PROTECT); 414 case _SC_THREAD_PRIORITY_SCHEDULING: 415 return (_POSIX_THREAD_PRIORITY_SCHEDULING); 416 case _SC_THREAD_PROCESS_SHARED: 417 return (_POSIX_THREAD_PROCESS_SHARED); 418 case _SC_THREAD_ROBUST_PRIO_INHERIT: 419 return (_POSIX_THREAD_ROBUST_PRIO_INHERIT); 420 case _SC_THREAD_ROBUST_PRIO_PROTECT: 421 return (_POSIX_THREAD_ROBUST_PRIO_PROTECT); 422 case _SC_THREAD_SAFE_FUNCTIONS: 423 return (_POSIX_THREAD_SAFE_FUNCTIONS); 424 case _SC_THREAD_SPORADIC_SERVER: 425 return (_POSIX_THREAD_SPORADIC_SERVER); 426 case _SC_THREAD_STACK_MIN: 427 return (PTHREAD_STACK_MIN); 428 case _SC_THREAD_THREADS_MAX: 429 return (PTHREAD_THREADS_MAX); /* XXX wrong type! */ 430 case _SC_TIMEOUTS: 431 return (_POSIX_TIMEOUTS); 432 case _SC_THREADS: 433 return (_POSIX_THREADS); 434 case _SC_TRACE: 435 #if _POSIX_TRACE == 0 436 #error "_POSIX_TRACE" 437 /* While you're implementing this, also do the ones below. */ 438 #else 439 return (_POSIX_TRACE); 440 #endif 441 #if _POSIX_TRACE > -1 442 case _SC_TRACE_EVENT_FILTER: 443 return (_POSIX_TRACE_EVENT_FILTER); 444 case _SC_TRACE_INHERIT: 445 return (_POSIX_TRACE_INHERIT); 446 case _SC_TRACE_LOG: 447 return (_POSIX_TRACE_LOG); 448 #endif 449 case _SC_TTY_NAME_MAX: 450 path = _PATH_DEV; 451 goto do_NAME_MAX; 452 case _SC_TYPED_MEMORY_OBJECTS: 453 #if _POSIX_TYPED_MEMORY_OBJECTS == 0 454 #error "_POSIX_TYPED_MEMORY_OBJECTS" 455 #else 456 return (_POSIX_TYPED_MEMORY_OBJECTS); 457 #endif 458 case _SC_V6_ILP32_OFF32: 459 #if _V6_ILP32_OFF32 == 0 460 if (sizeof(int) * CHAR_BIT == 32 && 461 sizeof(int) == sizeof(long) && 462 sizeof(long) == sizeof(void *) && 463 sizeof(void *) == sizeof(off_t)) 464 return 1; 465 else 466 return -1; 467 #else 468 return (_V6_ILP32_OFF32); 469 #endif 470 case _SC_V6_ILP32_OFFBIG: 471 #if _V6_ILP32_OFFBIG == 0 472 if (sizeof(int) * CHAR_BIT == 32 && 473 sizeof(int) == sizeof(long) && 474 sizeof(long) == sizeof(void *) && 475 sizeof(off_t) * CHAR_BIT >= 64) 476 return 1; 477 else 478 return -1; 479 #else 480 return (_V6_ILP32_OFFBIG); 481 #endif 482 case _SC_V6_LP64_OFF64: 483 #if _V6_LP64_OFF64 == 0 484 if (sizeof(int) * CHAR_BIT == 32 && 485 sizeof(long) * CHAR_BIT == 64 && 486 sizeof(long) == sizeof(void *) && 487 sizeof(void *) == sizeof(off_t)) 488 return 1; 489 else 490 return -1; 491 #else 492 return (_V6_LP64_OFF64); 493 #endif 494 case _SC_V6_LPBIG_OFFBIG: 495 #if _V6_LPBIG_OFFBIG == 0 496 if (sizeof(int) * CHAR_BIT >= 32 && 497 sizeof(long) * CHAR_BIT >= 64 && 498 sizeof(void *) * CHAR_BIT >= 64 && 499 sizeof(off_t) * CHAR_BIT >= 64) 500 return 1; 501 else 502 return -1; 503 #else 504 return (_V6_LPBIG_OFFBIG); 505 #endif 506 case _SC_V7_ILP32_OFF32: 507 #if _V7_ILP32_OFF32 == 0 508 if (sizeof(int) * CHAR_BIT == 32 && 509 sizeof(int) == sizeof(long) && 510 sizeof(long) == sizeof(void *) && 511 sizeof(void *) == sizeof(off_t)) 512 return 1; 513 else 514 return -1; 515 #else 516 return (_V7_ILP32_OFF32); 517 #endif 518 case _SC_V7_ILP32_OFFBIG: 519 #if _V7_ILP32_OFFBIG == 0 520 if (sizeof(int) * CHAR_BIT == 32 && 521 sizeof(int) == sizeof(long) && 522 sizeof(long) == sizeof(void *) && 523 sizeof(off_t) * CHAR_BIT >= 64) 524 return 1; 525 else 526 return -1; 527 #else 528 return (_V7_ILP32_OFFBIG); 529 #endif 530 case _SC_V7_LP64_OFF64: 531 #if _V7_LP64_OFF64 == 0 532 if (sizeof(int) * CHAR_BIT == 32 && 533 sizeof(long) * CHAR_BIT == 64 && 534 sizeof(long) == sizeof(void *) && 535 sizeof(void *) == sizeof(off_t)) 536 return 1; 537 else 538 return -1; 539 #else 540 return (_V7_LP64_OFF64); 541 #endif 542 case _SC_V7_LPBIG_OFFBIG: 543 #if _V7_LPBIG_OFFBIG == 0 544 if (sizeof(int) * CHAR_BIT >= 32 && 545 sizeof(long) * CHAR_BIT >= 64 && 546 sizeof(void *) * CHAR_BIT >= 64 && 547 sizeof(off_t) * CHAR_BIT >= 64) 548 return 1; 549 else 550 return -1; 551 #else 552 return (_V7_LPBIG_OFFBIG); 553 #endif 554 case _SC_ATEXIT_MAX: 555 return (ATEXIT_SIZE); 556 case _SC_IOV_MAX: 557 mib[0] = CTL_KERN; 558 mib[1] = KERN_IOV_MAX; 559 break; 560 case _SC_XOPEN_CRYPT: 561 return (_XOPEN_CRYPT); 562 case _SC_XOPEN_ENH_I18N: 563 return (_XOPEN_ENH_I18N); 564 case _SC_XOPEN_LEGACY: 565 return (_XOPEN_LEGACY); 566 case _SC_XOPEN_REALTIME: 567 #if _XOPEN_REALTIME == 0 568 sverrno = errno; 569 value = sysconf(_SC_ASYNCHRONOUS_IO) > 0 && 570 sysconf(_SC_MEMLOCK) > 0 && 571 sysconf(_SC_MEMLOCK_RANGE) > 0 && 572 sysconf(_SC_MESSAGE_PASSING) > 0 && 573 sysconf(_SC_PRIORITY_SCHEDULING) > 0 && 574 sysconf(_SC_REALTIME_SIGNALS) > 0 && 575 sysconf(_SC_SEMAPHORES) > 0 && 576 sysconf(_SC_SHARED_MEMORY_OBJECTS) > 0 && 577 sysconf(_SC_SYNCHRONIZED_IO) > 0 && 578 sysconf(_SC_TIMERS) > 0; 579 errno = sverrno; 580 if (value) 581 return (200112L); 582 else 583 return (-1); 584 #else 585 return (_XOPEN_REALTIME); 586 #endif 587 case _SC_XOPEN_REALTIME_THREADS: 588 #if _XOPEN_REALTIME_THREADS == 0 589 #error "_XOPEN_REALTIME_THREADS" 590 #else 591 return (_XOPEN_REALTIME_THREADS); 592 #endif 593 case _SC_XOPEN_SHM: 594 return (_XOPEN_SHM); 595 case _SC_XOPEN_STREAMS: 596 return (_XOPEN_STREAMS); 597 case _SC_XOPEN_UNIX: 598 return (_XOPEN_UNIX); 599 #ifdef _XOPEN_VERSION 600 case _SC_XOPEN_VERSION: 601 return (_XOPEN_VERSION); 602 #endif 603 #ifdef _XOPEN_XCU_VERSION 604 case _SC_XOPEN_XCU_VERSION: 605 return (_XOPEN_XCU_VERSION); 606 #endif 607 case _SC_SYMLOOP_MAX: 608 return (MAXSYMLINKS); 609 case _SC_RAW_SOCKETS: 610 return (_POSIX_RAW_SOCKETS); 611 case _SC_IPV6: 612 #if _POSIX_IPV6 == 0 613 sverrno = errno; 614 value = socket(PF_INET6, SOCK_DGRAM, 0); 615 errno = sverrno; 616 if (value >= 0) { 617 close(value); 618 return (200112L); 619 } else 620 return (0); 621 #else 622 return (_POSIX_IPV6); 623 #endif 624 625 case _SC_NPROCESSORS_CONF: 626 case _SC_NPROCESSORS_ONLN: 627 mib[0] = CTL_HW; 628 mib[1] = HW_NCPU; 629 break; 630 631 #ifdef _SC_PHYS_PAGES 632 case _SC_PHYS_PAGES: 633 len = sizeof(lvalue); 634 if (sysctlbyname("hw.availpages", &lvalue, &len, NULL, 0) == -1) 635 return (-1); 636 return (lvalue); 637 #endif 638 639 case _SC_LEVEL1_DCACHE_LINESIZE: 640 return (__VM_CACHELINE_SIZE); 641 642 default: 643 errno = EINVAL; 644 return (-1); 645 } 646 len = sizeof(value); 647 if (sysctl(mib, 2, &value, &len, NULL, 0) == -1) 648 value = -1; 649 return ((long)value); 650 } 651