sysconf.c revision 292521
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) 34static 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: head/lib/libc/gen/sysconf.c 292521 2015-12-20 23:05:20Z jilles $"); 38 39#include "namespace.h" 40#include <sys/param.h> 41#include <sys/time.h> 42#include <sys/sysctl.h> 43#include <sys/resource.h> 44#include <sys/socket.h> 45 46#include <elf.h> 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#include "un-namespace.h" 54 55#include "../stdlib/atexit.h" 56#include "tzfile.h" /* from ../../../contrib/tzcode/stdtime */ 57#include "libc_private.h" 58 59#define _PATH_ZONEINFO TZDIR /* from tzfile.h */ 60 61/* 62 * sysconf -- 63 * get configurable system variables. 64 * 65 * XXX 66 * POSIX 1003.1 (ISO/IEC 9945-1, 4.8.1.3) states that the variable values 67 * not change during the lifetime of the calling process. This would seem 68 * to require that any change to system limits kill all running processes. 69 * A workaround might be to cache the values when they are first retrieved 70 * and then simply return the cached value on subsequent calls. This is 71 * less useful than returning up-to-date values, however. 72 */ 73long 74sysconf(int name) 75{ 76 struct rlimit rl; 77 size_t len; 78 int mib[2], 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 if (getrlimit(RLIMIT_NOFILE, &rl) != 0) 107 return (-1); 108 if (rl.rlim_cur == RLIM_INFINITY) 109 return (-1); 110 if (rl.rlim_cur > LONG_MAX) { 111 errno = EOVERFLOW; 112 return (-1); 113 } 114 return ((long)rl.rlim_cur); 115 case _SC_STREAM_MAX: 116 if (getrlimit(RLIMIT_NOFILE, &rl) != 0) 117 return (-1); 118 if (rl.rlim_cur == RLIM_INFINITY) 119 return (-1); 120 if (rl.rlim_cur > LONG_MAX) { 121 errno = EOVERFLOW; 122 return (-1); 123 } 124 /* 125 * struct __sFILE currently has a limitation that 126 * file descriptors must fit in a signed short. 127 * This doesn't precisely capture the letter of POSIX 128 * but approximates the spirit. 129 */ 130 if (rl.rlim_cur > SHRT_MAX) 131 return (SHRT_MAX); 132 133 return ((long)rl.rlim_cur); 134 case _SC_JOB_CONTROL: 135 return (_POSIX_JOB_CONTROL); 136 case _SC_SAVED_IDS: 137 /* XXX - must be 1 */ 138 mib[0] = CTL_KERN; 139 mib[1] = KERN_SAVED_IDS; 140 goto yesno; 141 case _SC_VERSION: 142 mib[0] = CTL_KERN; 143 mib[1] = KERN_POSIX1; 144 break; 145 case _SC_BC_BASE_MAX: 146 return (BC_BASE_MAX); 147 case _SC_BC_DIM_MAX: 148 return (BC_DIM_MAX); 149 case _SC_BC_SCALE_MAX: 150 return (BC_SCALE_MAX); 151 case _SC_BC_STRING_MAX: 152 return (BC_STRING_MAX); 153 case _SC_COLL_WEIGHTS_MAX: 154 return (COLL_WEIGHTS_MAX); 155 case _SC_EXPR_NEST_MAX: 156 return (EXPR_NEST_MAX); 157 case _SC_LINE_MAX: 158 return (LINE_MAX); 159 case _SC_RE_DUP_MAX: 160 return (RE_DUP_MAX); 161 case _SC_2_VERSION: 162 /* 163 * This is something of a lie, but it would be silly at 164 * this point to try to deduce this from the contents 165 * of the filesystem. 166 */ 167 return (_POSIX2_VERSION); 168 case _SC_2_C_BIND: 169 return (_POSIX2_C_BIND); 170 case _SC_2_C_DEV: 171 return (_POSIX2_C_DEV); 172 case _SC_2_CHAR_TERM: 173 return (_POSIX2_CHAR_TERM); 174 case _SC_2_FORT_DEV: 175 return (_POSIX2_FORT_DEV); 176 case _SC_2_FORT_RUN: 177 return (_POSIX2_FORT_RUN); 178 case _SC_2_LOCALEDEF: 179 return (_POSIX2_LOCALEDEF); 180 case _SC_2_SW_DEV: 181 return (_POSIX2_SW_DEV); 182 case _SC_2_UPE: 183 return (_POSIX2_UPE); 184 case _SC_TZNAME_MAX: 185 path = _PATH_ZONEINFO; 186do_NAME_MAX: 187 sverrno = errno; 188 errno = 0; 189 lvalue = pathconf(path, _PC_NAME_MAX); 190 if (lvalue == -1 && errno != 0) 191 return (-1); 192 errno = sverrno; 193 return (lvalue); 194 195 case _SC_ASYNCHRONOUS_IO: 196#if _POSIX_ASYNCHRONOUS_IO == 0 197 mib[0] = CTL_P1003_1B; 198 mib[1] = CTL_P1003_1B_ASYNCHRONOUS_IO; 199 break; 200#else 201 return (_POSIX_ASYNCHRONOUS_IO); 202#endif 203 case _SC_MAPPED_FILES: 204 return (_POSIX_MAPPED_FILES); 205 case _SC_MEMLOCK: 206 return (_POSIX_MEMLOCK); 207 case _SC_MEMLOCK_RANGE: 208 return (_POSIX_MEMLOCK_RANGE); 209 case _SC_MEMORY_PROTECTION: 210 return (_POSIX_MEMORY_PROTECTION); 211 case _SC_MESSAGE_PASSING: 212#if _POSIX_MESSAGE_PASSING == 0 213 mib[0] = CTL_P1003_1B; 214 mib[1] = CTL_P1003_1B_MESSAGE_PASSING; 215 goto yesno; 216#else 217 return (_POSIX_MESSAGE_PASSING); 218#endif 219 case _SC_PRIORITIZED_IO: 220#if _POSIX_PRIORITIZED_IO == 0 221 mib[0] = CTL_P1003_1B; 222 mib[1] = CTL_P1003_1B_PRIORITIZED_IO; 223 goto yesno; 224#else 225 return (_POSIX_PRIORITIZED_IO); 226#endif 227 case _SC_PRIORITY_SCHEDULING: 228#if _POSIX_PRIORITY_SCHEDULING == 0 229 mib[0] = CTL_P1003_1B; 230 mib[1] = CTL_P1003_1B_PRIORITY_SCHEDULING; 231 goto yesno; 232#else 233 return (_POSIX_PRIORITY_SCHEDULING); 234#endif 235 case _SC_REALTIME_SIGNALS: 236#if _POSIX_REALTIME_SIGNALS == 0 237 mib[0] = CTL_P1003_1B; 238 mib[1] = CTL_P1003_1B_REALTIME_SIGNALS; 239 goto yesno; 240#else 241 return (_POSIX_REALTIME_SIGNALS); 242#endif 243 case _SC_SEMAPHORES: 244#if _POSIX_SEMAPHORES == 0 245 mib[0] = CTL_P1003_1B; 246 mib[1] = CTL_P1003_1B_SEMAPHORES; 247 goto yesno; 248#else 249 return (_POSIX_SEMAPHORES); 250#endif 251 case _SC_FSYNC: 252 return (_POSIX_FSYNC); 253 254 case _SC_SHARED_MEMORY_OBJECTS: 255 return (_POSIX_SHARED_MEMORY_OBJECTS); 256 case _SC_SYNCHRONIZED_IO: 257#if _POSIX_SYNCHRONIZED_IO == 0 258 mib[0] = CTL_P1003_1B; 259 mib[1] = CTL_P1003_1B_SYNCHRONIZED_IO; 260 goto yesno; 261#else 262 return (_POSIX_SYNCHRONIZED_IO); 263#endif 264 case _SC_TIMERS: 265#if _POSIX_TIMERS == 0 266 mib[0] = CTL_P1003_1B; 267 mib[1] = CTL_P1003_1B_TIMERS; 268 goto yesno; 269#else 270 return (_POSIX_TIMERS); 271#endif 272 case _SC_AIO_LISTIO_MAX: 273 mib[0] = CTL_P1003_1B; 274 mib[1] = CTL_P1003_1B_AIO_LISTIO_MAX; 275 break; 276 case _SC_AIO_MAX: 277 mib[0] = CTL_P1003_1B; 278 mib[1] = CTL_P1003_1B_AIO_MAX; 279 break; 280 case _SC_AIO_PRIO_DELTA_MAX: 281 mib[0] = CTL_P1003_1B; 282 mib[1] = CTL_P1003_1B_AIO_PRIO_DELTA_MAX; 283 break; 284 case _SC_DELAYTIMER_MAX: 285 mib[0] = CTL_P1003_1B; 286 mib[1] = CTL_P1003_1B_DELAYTIMER_MAX; 287 goto yesno; 288 case _SC_MQ_OPEN_MAX: 289 mib[0] = CTL_P1003_1B; 290 mib[1] = CTL_P1003_1B_MQ_OPEN_MAX; 291 goto yesno; 292 case _SC_PAGESIZE: 293 defaultresult = getpagesize(); 294 mib[0] = CTL_P1003_1B; 295 mib[1] = CTL_P1003_1B_PAGESIZE; 296 goto yesno; 297 case _SC_RTSIG_MAX: 298 mib[0] = CTL_P1003_1B; 299 mib[1] = CTL_P1003_1B_RTSIG_MAX; 300 goto yesno; 301 case _SC_SEM_NSEMS_MAX: 302 mib[0] = CTL_P1003_1B; 303 mib[1] = CTL_P1003_1B_SEM_NSEMS_MAX; 304 goto yesno; 305 case _SC_SEM_VALUE_MAX: 306 mib[0] = CTL_P1003_1B; 307 mib[1] = CTL_P1003_1B_SEM_VALUE_MAX; 308 goto yesno; 309 case _SC_SIGQUEUE_MAX: 310 mib[0] = CTL_P1003_1B; 311 mib[1] = CTL_P1003_1B_SIGQUEUE_MAX; 312 goto yesno; 313 case _SC_TIMER_MAX: 314 mib[0] = CTL_P1003_1B; 315 mib[1] = CTL_P1003_1B_TIMER_MAX; 316yesno: 317 len = sizeof(value); 318 if (sysctl(mib, 2, &value, &len, NULL, 0) == -1) 319 return (-1); 320 if (value == 0) 321 return (defaultresult); 322 return ((long)value); 323 324 case _SC_2_PBS: 325 case _SC_2_PBS_ACCOUNTING: 326 case _SC_2_PBS_CHECKPOINT: 327 case _SC_2_PBS_LOCATE: 328 case _SC_2_PBS_MESSAGE: 329 case _SC_2_PBS_TRACK: 330#if _POSIX2_PBS == 0 331#error "don't know how to determine _SC_2_PBS" 332 /* 333 * This probably requires digging through the filesystem 334 * to see if the appropriate package has been installed. 335 * Since we don't currently support this option at all, 336 * it's not worth the effort to write the code now. 337 * Figuring out which of the sub-options are supported 338 * would be even more difficult, so it's probably easier 339 * to always say ``no''. 340 */ 341#else 342 return (_POSIX2_PBS); 343#endif 344 case _SC_ADVISORY_INFO: 345#if _POSIX_ADVISORY_INFO == 0 346#error "_POSIX_ADVISORY_INFO" 347#else 348 return (_POSIX_ADVISORY_INFO); 349#endif 350 case _SC_BARRIERS: 351#if _POSIX_BARRIERS == 0 352#error "_POSIX_BARRIERS" 353#else 354 return (_POSIX_BARRIERS); 355#endif 356 case _SC_CLOCK_SELECTION: 357#if _POSIX_CLOCK_SELECTION == 0 358#error "_POSIX_CLOCK_SELECTION" 359#else 360 return (_POSIX_CLOCK_SELECTION); 361#endif 362 case _SC_CPUTIME: 363 return (_POSIX_CPUTIME); 364#ifdef notdef 365 case _SC_FILE_LOCKING: 366 /* 367 * XXX - The standard doesn't tell us how to define 368 * _POSIX_FILE_LOCKING, so we can't answer this one. 369 */ 370#endif 371 372 /* 373 * SUSv4tc1 says the following about _SC_GETGR_R_SIZE_MAX and 374 * _SC_GETPW_R_SIZE_MAX: 375 * Note that sysconf(_SC_GETGR_R_SIZE_MAX) may return -1 if 376 * there is no hard limit on the size of the buffer needed to 377 * store all the groups returned. 378 */ 379 case _SC_GETGR_R_SIZE_MAX: 380 case _SC_GETPW_R_SIZE_MAX: 381 return (-1); 382 case _SC_HOST_NAME_MAX: 383 return (MAXHOSTNAMELEN - 1); /* does not include \0 */ 384 case _SC_LOGIN_NAME_MAX: 385 return (MAXLOGNAME); 386 case _SC_MONOTONIC_CLOCK: 387#if _POSIX_MONOTONIC_CLOCK == 0 388#error "_POSIX_MONOTONIC_CLOCK" 389#else 390 return (_POSIX_MONOTONIC_CLOCK); 391#endif 392#if _POSIX_MESSAGE_PASSING > -1 393 case _SC_MQ_PRIO_MAX: 394 return (MQ_PRIO_MAX); 395#endif 396 case _SC_READER_WRITER_LOCKS: 397 return (_POSIX_READER_WRITER_LOCKS); 398 case _SC_REGEXP: 399 return (_POSIX_REGEXP); 400 case _SC_SHELL: 401 return (_POSIX_SHELL); 402 case _SC_SPAWN: 403 return (_POSIX_SPAWN); 404 case _SC_SPIN_LOCKS: 405 return (_POSIX_SPIN_LOCKS); 406 case _SC_SPORADIC_SERVER: 407#if _POSIX_SPORADIC_SERVER == 0 408#error "_POSIX_SPORADIC_SERVER" 409#else 410 return (_POSIX_SPORADIC_SERVER); 411#endif 412 case _SC_THREAD_ATTR_STACKADDR: 413 return (_POSIX_THREAD_ATTR_STACKADDR); 414 case _SC_THREAD_ATTR_STACKSIZE: 415 return (_POSIX_THREAD_ATTR_STACKSIZE); 416 case _SC_THREAD_CPUTIME: 417 return (_POSIX_THREAD_CPUTIME); 418 case _SC_THREAD_DESTRUCTOR_ITERATIONS: 419 return (PTHREAD_DESTRUCTOR_ITERATIONS); 420 case _SC_THREAD_KEYS_MAX: 421 return (PTHREAD_KEYS_MAX); 422 case _SC_THREAD_PRIO_INHERIT: 423 return (_POSIX_THREAD_PRIO_INHERIT); 424 case _SC_THREAD_PRIO_PROTECT: 425 return (_POSIX_THREAD_PRIO_PROTECT); 426 case _SC_THREAD_PRIORITY_SCHEDULING: 427 return (_POSIX_THREAD_PRIORITY_SCHEDULING); 428 case _SC_THREAD_PROCESS_SHARED: 429 return (_POSIX_THREAD_PROCESS_SHARED); 430 case _SC_THREAD_SAFE_FUNCTIONS: 431 return (_POSIX_THREAD_SAFE_FUNCTIONS); 432 case _SC_THREAD_STACK_MIN: 433 return (PTHREAD_STACK_MIN); 434 case _SC_THREAD_THREADS_MAX: 435 return (PTHREAD_THREADS_MAX); /* XXX wrong type! */ 436 case _SC_TIMEOUTS: 437 return (_POSIX_TIMEOUTS); 438 case _SC_THREADS: 439 return (_POSIX_THREADS); 440 case _SC_TRACE: 441#if _POSIX_TRACE == 0 442#error "_POSIX_TRACE" 443 /* While you're implementing this, also do the ones below. */ 444#else 445 return (_POSIX_TRACE); 446#endif 447#if _POSIX_TRACE > -1 448 case _SC_TRACE_EVENT_FILTER: 449 return (_POSIX_TRACE_EVENT_FILTER); 450 case _SC_TRACE_INHERIT: 451 return (_POSIX_TRACE_INHERIT); 452 case _SC_TRACE_LOG: 453 return (_POSIX_TRACE_LOG); 454#endif 455 case _SC_TTY_NAME_MAX: 456 path = _PATH_DEV; 457 goto do_NAME_MAX; 458 case _SC_TYPED_MEMORY_OBJECTS: 459#if _POSIX_TYPED_MEMORY_OBJECTS == 0 460#error "_POSIX_TYPED_MEMORY_OBJECTS" 461#else 462 return (_POSIX_TYPED_MEMORY_OBJECTS); 463#endif 464 case _SC_V6_ILP32_OFF32: 465#if _V6_ILP32_OFF32 == 0 466 if (sizeof(int) * CHAR_BIT == 32 && 467 sizeof(int) == sizeof(long) && 468 sizeof(long) == sizeof(void *) && 469 sizeof(void *) == sizeof(off_t)) 470 return 1; 471 else 472 return -1; 473#else 474 return (_V6_ILP32_OFF32); 475#endif 476 case _SC_V6_ILP32_OFFBIG: 477#if _V6_ILP32_OFFBIG == 0 478 if (sizeof(int) * CHAR_BIT == 32 && 479 sizeof(int) == sizeof(long) && 480 sizeof(long) == sizeof(void *) && 481 sizeof(off_t) * CHAR_BIT >= 64) 482 return 1; 483 else 484 return -1; 485#else 486 return (_V6_ILP32_OFFBIG); 487#endif 488 case _SC_V6_LP64_OFF64: 489#if _V6_LP64_OFF64 == 0 490 if (sizeof(int) * CHAR_BIT == 32 && 491 sizeof(long) * CHAR_BIT == 64 && 492 sizeof(long) == sizeof(void *) && 493 sizeof(void *) == sizeof(off_t)) 494 return 1; 495 else 496 return -1; 497#else 498 return (_V6_LP64_OFF64); 499#endif 500 case _SC_V6_LPBIG_OFFBIG: 501#if _V6_LPBIG_OFFBIG == 0 502 if (sizeof(int) * CHAR_BIT >= 32 && 503 sizeof(long) * CHAR_BIT >= 64 && 504 sizeof(void *) * CHAR_BIT >= 64 && 505 sizeof(off_t) * CHAR_BIT >= 64) 506 return 1; 507 else 508 return -1; 509#else 510 return (_V6_LPBIG_OFFBIG); 511#endif 512 case _SC_ATEXIT_MAX: 513 return (ATEXIT_SIZE); 514 case _SC_IOV_MAX: 515 mib[0] = CTL_KERN; 516 mib[1] = KERN_IOV_MAX; 517 break; 518 case _SC_XOPEN_CRYPT: 519 return (_XOPEN_CRYPT); 520 case _SC_XOPEN_ENH_I18N: 521 return (_XOPEN_ENH_I18N); 522 case _SC_XOPEN_LEGACY: 523 return (_XOPEN_LEGACY); 524 case _SC_XOPEN_REALTIME: 525#if _XOPEN_REALTIME == 0 526 sverrno = errno; 527 value = sysconf(_SC_ASYNCHRONOUS_IO) > 0 && 528 sysconf(_SC_MEMLOCK) > 0 && 529 sysconf(_SC_MEMLOCK_RANGE) > 0 && 530 sysconf(_SC_MESSAGE_PASSING) > 0 && 531 sysconf(_SC_PRIORITY_SCHEDULING) > 0 && 532 sysconf(_SC_REALTIME_SIGNALS) > 0 && 533 sysconf(_SC_SEMAPHORES) > 0 && 534 sysconf(_SC_SHARED_MEMORY_OBJECTS) > 0 && 535 sysconf(_SC_SYNCHRONIZED_IO) > 0 && 536 sysconf(_SC_TIMERS) > 0; 537 errno = sverrno; 538 if (value) 539 return (200112L); 540 else 541 return (-1); 542#else 543 return (_XOPEN_REALTIME); 544#endif 545 case _SC_XOPEN_REALTIME_THREADS: 546#if _XOPEN_REALTIME_THREADS == 0 547#error "_XOPEN_REALTIME_THREADS" 548#else 549 return (_XOPEN_REALTIME_THREADS); 550#endif 551 case _SC_XOPEN_SHM: 552 len = sizeof(lvalue); 553 sverrno = errno; 554 if (sysctlbyname("kern.ipc.shmmin", &lvalue, &len, NULL, 555 0) == -1) { 556 errno = sverrno; 557 return (-1); 558 } 559 errno = sverrno; 560 return (1); 561 case _SC_XOPEN_STREAMS: 562 return (_XOPEN_STREAMS); 563 case _SC_XOPEN_UNIX: 564 return (_XOPEN_UNIX); 565#ifdef _XOPEN_VERSION 566 case _SC_XOPEN_VERSION: 567 return (_XOPEN_VERSION); 568#endif 569#ifdef _XOPEN_XCU_VERSION 570 case _SC_XOPEN_XCU_VERSION: 571 return (_XOPEN_XCU_VERSION); 572#endif 573 case _SC_SYMLOOP_MAX: 574 return (MAXSYMLINKS); 575 case _SC_RAW_SOCKETS: 576 return (_POSIX_RAW_SOCKETS); 577 case _SC_IPV6: 578#if _POSIX_IPV6 == 0 579 sverrno = errno; 580 value = _socket(PF_INET6, SOCK_DGRAM, 0); 581 errno = sverrno; 582 if (value >= 0) { 583 _close(value); 584 return (200112L); 585 } else 586 return (0); 587#else 588 return (_POSIX_IPV6); 589#endif 590 591 case _SC_NPROCESSORS_CONF: 592 case _SC_NPROCESSORS_ONLN: 593 if (_elf_aux_info(AT_NCPUS, &value, sizeof(value)) == 0) 594 return ((long)value); 595 mib[0] = CTL_HW; 596 mib[1] = HW_NCPU; 597 break; 598 599#ifdef _SC_PHYS_PAGES 600 case _SC_PHYS_PAGES: 601 len = sizeof(lvalue); 602 if (sysctlbyname("hw.availpages", &lvalue, &len, NULL, 0) == -1) 603 return (-1); 604 return (lvalue); 605#endif 606 607#ifdef _SC_CPUSET_SIZE 608 case _SC_CPUSET_SIZE: 609 len = sizeof(value); 610 if (sysctlbyname("kern.sched.cpusetsize", &value, &len, NULL, 611 0) == -1) 612 return (-1); 613 return ((long)value); 614#endif 615 616 default: 617 errno = EINVAL; 618 return (-1); 619 } 620 len = sizeof(value); 621 if (sysctl(mib, 2, &value, &len, NULL, 0) == -1) 622 value = -1; 623 return ((long)value); 624} 625