sysconf.c revision 268467
11539Srgrimes/*- 21539Srgrimes * Copyright (c) 1993 31539Srgrimes * The Regents of the University of California. All rights reserved. 41539Srgrimes * 51539Srgrimes * This code is derived from software contributed to Berkeley by 61539Srgrimes * Sean Eric Fagan of Cygnus Support. 71539Srgrimes * 81539Srgrimes * Redistribution and use in source and binary forms, with or without 91539Srgrimes * modification, are permitted provided that the following conditions 101539Srgrimes * are met: 111539Srgrimes * 1. Redistributions of source code must retain the above copyright 121539Srgrimes * notice, this list of conditions and the following disclaimer. 131539Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 141539Srgrimes * notice, this list of conditions and the following disclaimer in the 151539Srgrimes * documentation and/or other materials provided with the distribution. 161539Srgrimes * 4. Neither the name of the University nor the names of its contributors 171539Srgrimes * may be used to endorse or promote products derived from this software 181539Srgrimes * without specific prior written permission. 191539Srgrimes * 201539Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 211539Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 221539Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 231539Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 241539Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 251539Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 261539Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 271539Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 281539Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 291539Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 301539Srgrimes * SUCH DAMAGE. 311539Srgrimes */ 321539Srgrimes 3323650Speter#if defined(LIBC_SCCS) && !defined(lint) 3478169Srustatic char sccsid[] = "@(#)sysconf.c 8.2 (Berkeley) 3/20/94"; 351539Srgrimes#endif /* LIBC_SCCS and not lint */ 361539Srgrimes#include <sys/cdefs.h> 371539Srgrimes__FBSDID("$FreeBSD: head/lib/libc/gen/sysconf.c 268467 2014-07-09 19:12:18Z kib $"); 381539Srgrimes 391539Srgrimes#include <sys/param.h> 401539Srgrimes#include <sys/time.h> 411539Srgrimes#include <sys/sysctl.h> 421539Srgrimes#include <sys/resource.h> 431539Srgrimes#include <sys/socket.h> 441539Srgrimes 451539Srgrimes#include <elf.h> 461539Srgrimes#include <errno.h> 471539Srgrimes#include <limits.h> 481539Srgrimes#include <paths.h> 4978169Sru#include <pthread.h> /* we just need the limits */ 50103726Swollman#include <time.h> 511539Srgrimes#include <unistd.h> 521539Srgrimes 531539Srgrimes#include "../stdlib/atexit.h" 541539Srgrimes#include "tzfile.h" /* from ../../../contrib/tzcode/stdtime */ 551539Srgrimes#include "libc_private.h" 561539Srgrimes 571539Srgrimes#define _PATH_ZONEINFO TZDIR /* from tzfile.h */ 581539Srgrimes 5923650Speter/* 6023650Speter * sysconf -- 611539Srgrimes * get configurable system variables. 6223650Speter * 6323650Speter * XXX 641539Srgrimes * POSIX 1003.1 (ISO/IEC 9945-1, 4.8.1.3) states that the variable values 65103726Swollman * not change during the lifetime of the calling process. This would seem 661539Srgrimes * to require that any change to system limits kill all running processes. 671539Srgrimes * A workaround might be to cache the values when they are first retrieved 681539Srgrimes * and then simply return the cached value on subsequent calls. This is 691539Srgrimes * less useful than returning up-to-date values, however. 701539Srgrimes */ 711539Srgrimeslong 721539Srgrimessysconf(name) 731539Srgrimes int name; 741539Srgrimes{ 751539Srgrimes struct rlimit rl; 761539Srgrimes size_t len; 771539Srgrimes int mib[2], sverrno, value; 781539Srgrimes long lvalue, defaultresult; 791539Srgrimes const char *path; 801539Srgrimes 811539Srgrimes defaultresult = -1; 821539Srgrimes 831539Srgrimes switch (name) { 841539Srgrimes case _SC_ARG_MAX: 851539Srgrimes mib[0] = CTL_KERN; 861539Srgrimes mib[1] = KERN_ARGMAX; 871539Srgrimes break; 881539Srgrimes case _SC_CHILD_MAX: 891539Srgrimes if (getrlimit(RLIMIT_NPROC, &rl) != 0) 901539Srgrimes return (-1); 911539Srgrimes if (rl.rlim_cur == RLIM_INFINITY) 921539Srgrimes return (-1); 931539Srgrimes if (rl.rlim_cur > LONG_MAX) { 941539Srgrimes errno = EOVERFLOW; 951539Srgrimes return (-1); 961539Srgrimes } 971539Srgrimes return ((long)rl.rlim_cur); 981539Srgrimes case _SC_CLK_TCK: 991539Srgrimes return (CLK_TCK); 1001539Srgrimes case _SC_NGROUPS_MAX: 1011539Srgrimes mib[0] = CTL_KERN; 10223650Speter mib[1] = KERN_NGROUPS; 1031539Srgrimes break; 1041539Srgrimes case _SC_OPEN_MAX: 1051539Srgrimes if (getrlimit(RLIMIT_NOFILE, &rl) != 0) 1061539Srgrimes return (-1); 10723650Speter if (rl.rlim_cur == RLIM_INFINITY) 1081539Srgrimes return (-1); 1091539Srgrimes if (rl.rlim_cur > LONG_MAX) { 1101539Srgrimes errno = EOVERFLOW; 1111539Srgrimes return (-1); 1121539Srgrimes } 1131539Srgrimes return ((long)rl.rlim_cur); 1141539Srgrimes case _SC_STREAM_MAX: 1151539Srgrimes if (getrlimit(RLIMIT_NOFILE, &rl) != 0) 1161539Srgrimes return (-1); 117103726Swollman if (rl.rlim_cur == RLIM_INFINITY) 118103726Swollman return (-1); 1191539Srgrimes if (rl.rlim_cur > LONG_MAX) { 1201539Srgrimes errno = EOVERFLOW; 1211539Srgrimes return (-1); 1221539Srgrimes } 1231539Srgrimes /* 12493032Simp * struct __sFILE currently has a limitation that 12593032Simp * file descriptors must fit in a signed short. 126103726Swollman * This doesn't precisely capture the letter of POSIX 127103726Swollman * but approximates the spirit. 128103726Swollman */ 129103726Swollman if (rl.rlim_cur > SHRT_MAX) 13093032Simp return (SHRT_MAX); 131103726Swollman 13293032Simp return ((long)rl.rlim_cur); 13393032Simp case _SC_JOB_CONTROL: 134103726Swollman return (_POSIX_JOB_CONTROL); 1351539Srgrimes case _SC_SAVED_IDS: 1361539Srgrimes /* XXX - must be 1 */ 1371539Srgrimes mib[0] = CTL_KERN; 138 mib[1] = KERN_SAVED_IDS; 139 goto yesno; 140 case _SC_VERSION: 141 mib[0] = CTL_KERN; 142 mib[1] = KERN_POSIX1; 143 break; 144 case _SC_BC_BASE_MAX: 145 return (BC_BASE_MAX); 146 case _SC_BC_DIM_MAX: 147 return (BC_DIM_MAX); 148 case _SC_BC_SCALE_MAX: 149 return (BC_SCALE_MAX); 150 case _SC_BC_STRING_MAX: 151 return (BC_STRING_MAX); 152 case _SC_COLL_WEIGHTS_MAX: 153 return (COLL_WEIGHTS_MAX); 154 case _SC_EXPR_NEST_MAX: 155 return (EXPR_NEST_MAX); 156 case _SC_LINE_MAX: 157 return (LINE_MAX); 158 case _SC_RE_DUP_MAX: 159 return (RE_DUP_MAX); 160 case _SC_2_VERSION: 161 /* 162 * This is something of a lie, but it would be silly at 163 * this point to try to deduce this from the contents 164 * of the filesystem. 165 */ 166 return (_POSIX2_VERSION); 167 case _SC_2_C_BIND: 168 return (_POSIX2_C_BIND); 169 case _SC_2_C_DEV: 170 return (_POSIX2_C_DEV); 171 case _SC_2_CHAR_TERM: 172 return (_POSIX2_CHAR_TERM); 173 case _SC_2_FORT_DEV: 174 return (_POSIX2_FORT_DEV); 175 case _SC_2_FORT_RUN: 176 return (_POSIX2_FORT_RUN); 177 case _SC_2_LOCALEDEF: 178 return (_POSIX2_LOCALEDEF); 179 case _SC_2_SW_DEV: 180 return (_POSIX2_SW_DEV); 181 case _SC_2_UPE: 182 return (_POSIX2_UPE); 183 case _SC_TZNAME_MAX: 184 path = _PATH_ZONEINFO; 185do_NAME_MAX: 186 sverrno = errno; 187 errno = 0; 188 lvalue = pathconf(path, _PC_NAME_MAX); 189 if (lvalue == -1 && errno != 0) 190 return (-1); 191 errno = sverrno; 192 return (lvalue); 193 194 case _SC_ASYNCHRONOUS_IO: 195#if _POSIX_ASYNCHRONOUS_IO == 0 196 mib[0] = CTL_P1003_1B; 197 mib[1] = CTL_P1003_1B_ASYNCHRONOUS_IO; 198 break; 199#else 200 return (_POSIX_ASYNCHRONOUS_IO); 201#endif 202 case _SC_MAPPED_FILES: 203 return (_POSIX_MAPPED_FILES); 204 case _SC_MEMLOCK: 205 return (_POSIX_MEMLOCK); 206 case _SC_MEMLOCK_RANGE: 207 return (_POSIX_MEMLOCK_RANGE); 208 case _SC_MEMORY_PROTECTION: 209 return (_POSIX_MEMORY_PROTECTION); 210 case _SC_MESSAGE_PASSING: 211#if _POSIX_MESSAGE_PASSING == 0 212 mib[0] = CTL_P1003_1B; 213 mib[1] = CTL_P1003_1B_MESSAGE_PASSING; 214 goto yesno; 215#else 216 return (_POSIX_MESSAGE_PASSING); 217#endif 218 case _SC_PRIORITIZED_IO: 219#if _POSIX_PRIORITIZED_IO == 0 220 mib[0] = CTL_P1003_1B; 221 mib[1] = CTL_P1003_1B_PRIORITIZED_IO; 222 goto yesno; 223#else 224 return (_POSIX_PRIORITIZED_IO); 225#endif 226 case _SC_PRIORITY_SCHEDULING: 227#if _POSIX_PRIORITY_SCHEDULING == 0 228 mib[0] = CTL_P1003_1B; 229 mib[1] = CTL_P1003_1B_PRIORITY_SCHEDULING; 230 goto yesno; 231#else 232 return (_POSIX_PRIORITY_SCHEDULING); 233#endif 234 case _SC_REALTIME_SIGNALS: 235#if _POSIX_REALTIME_SIGNALS == 0 236 mib[0] = CTL_P1003_1B; 237 mib[1] = CTL_P1003_1B_REALTIME_SIGNALS; 238 goto yesno; 239#else 240 return (_POSIX_REALTIME_SIGNALS); 241#endif 242 case _SC_SEMAPHORES: 243#if _POSIX_SEMAPHORES == 0 244 mib[0] = CTL_P1003_1B; 245 mib[1] = CTL_P1003_1B_SEMAPHORES; 246 goto yesno; 247#else 248 return (_POSIX_SEMAPHORES); 249#endif 250 case _SC_FSYNC: 251 return (_POSIX_FSYNC); 252 253 case _SC_SHARED_MEMORY_OBJECTS: 254 return (_POSIX_SHARED_MEMORY_OBJECTS); 255 case _SC_SYNCHRONIZED_IO: 256#if _POSIX_SYNCHRONIZED_IO == 0 257 mib[0] = CTL_P1003_1B; 258 mib[1] = CTL_P1003_1B_SYNCHRONIZED_IO; 259 goto yesno; 260#else 261 return (_POSIX_SYNCHRONIZED_IO); 262#endif 263 case _SC_TIMERS: 264#if _POSIX_TIMERS == 0 265 mib[0] = CTL_P1003_1B; 266 mib[1] = CTL_P1003_1B_TIMERS; 267 goto yesno; 268#else 269 return (_POSIX_TIMERS); 270#endif 271 case _SC_AIO_LISTIO_MAX: 272 mib[0] = CTL_P1003_1B; 273 mib[1] = CTL_P1003_1B_AIO_LISTIO_MAX; 274 break; 275 case _SC_AIO_MAX: 276 mib[0] = CTL_P1003_1B; 277 mib[1] = CTL_P1003_1B_AIO_MAX; 278 break; 279 case _SC_AIO_PRIO_DELTA_MAX: 280 mib[0] = CTL_P1003_1B; 281 mib[1] = CTL_P1003_1B_AIO_PRIO_DELTA_MAX; 282 break; 283 case _SC_DELAYTIMER_MAX: 284 mib[0] = CTL_P1003_1B; 285 mib[1] = CTL_P1003_1B_DELAYTIMER_MAX; 286 goto yesno; 287 case _SC_MQ_OPEN_MAX: 288 mib[0] = CTL_P1003_1B; 289 mib[1] = CTL_P1003_1B_MQ_OPEN_MAX; 290 goto yesno; 291 case _SC_PAGESIZE: 292 defaultresult = getpagesize(); 293 mib[0] = CTL_P1003_1B; 294 mib[1] = CTL_P1003_1B_PAGESIZE; 295 goto yesno; 296 case _SC_RTSIG_MAX: 297 mib[0] = CTL_P1003_1B; 298 mib[1] = CTL_P1003_1B_RTSIG_MAX; 299 goto yesno; 300 case _SC_SEM_NSEMS_MAX: 301 mib[0] = CTL_P1003_1B; 302 mib[1] = CTL_P1003_1B_SEM_NSEMS_MAX; 303 goto yesno; 304 case _SC_SEM_VALUE_MAX: 305 mib[0] = CTL_P1003_1B; 306 mib[1] = CTL_P1003_1B_SEM_VALUE_MAX; 307 goto yesno; 308 case _SC_SIGQUEUE_MAX: 309 mib[0] = CTL_P1003_1B; 310 mib[1] = CTL_P1003_1B_SIGQUEUE_MAX; 311 goto yesno; 312 case _SC_TIMER_MAX: 313 mib[0] = CTL_P1003_1B; 314 mib[1] = CTL_P1003_1B_TIMER_MAX; 315yesno: 316 len = sizeof(value); 317 if (sysctl(mib, 2, &value, &len, NULL, 0) == -1) 318 return (-1); 319 if (value == 0) 320 return (defaultresult); 321 return ((long)value); 322 323 case _SC_2_PBS: 324 case _SC_2_PBS_ACCOUNTING: 325 case _SC_2_PBS_CHECKPOINT: 326 case _SC_2_PBS_LOCATE: 327 case _SC_2_PBS_MESSAGE: 328 case _SC_2_PBS_TRACK: 329#if _POSIX2_PBS == 0 330#error "don't know how to determine _SC_2_PBS" 331 /* 332 * This probably requires digging through the filesystem 333 * to see if the appropriate package has been installed. 334 * Since we don't currently support this option at all, 335 * it's not worth the effort to write the code now. 336 * Figuring out which of the sub-options are supported 337 * would be even more difficult, so it's probably easier 338 * to always say ``no''. 339 */ 340#else 341 return (_POSIX2_PBS); 342#endif 343 case _SC_ADVISORY_INFO: 344#if _POSIX_ADVISORY_INFO == 0 345#error "_POSIX_ADVISORY_INFO" 346#else 347 return (_POSIX_ADVISORY_INFO); 348#endif 349 case _SC_BARRIERS: 350#if _POSIX_BARRIERS == 0 351#error "_POSIX_BARRIERS" 352#else 353 return (_POSIX_BARRIERS); 354#endif 355 case _SC_CLOCK_SELECTION: 356#if _POSIX_CLOCK_SELECTION == 0 357#error "_POSIX_CLOCK_SELECTION" 358#else 359 return (_POSIX_CLOCK_SELECTION); 360#endif 361 case _SC_CPUTIME: 362 return (_POSIX_CPUTIME); 363#ifdef notdef 364 case _SC_FILE_LOCKING: 365 /* 366 * XXX - The standard doesn't tell us how to define 367 * _POSIX_FILE_LOCKING, so we can't answer this one. 368 */ 369#endif 370 371 /* 372 * SUSv4tc1 says the following about _SC_GETGR_R_SIZE_MAX and 373 * _SC_GETPW_R_SIZE_MAX: 374 * Note that sysconf(_SC_GETGR_R_SIZE_MAX) may return -1 if 375 * there is no hard limit on the size of the buffer needed to 376 * store all the groups returned. 377 */ 378 case _SC_GETGR_R_SIZE_MAX: 379 case _SC_GETPW_R_SIZE_MAX: 380 return (-1); 381 case _SC_HOST_NAME_MAX: 382 return (MAXHOSTNAMELEN - 1); /* does not include \0 */ 383 case _SC_LOGIN_NAME_MAX: 384 return (MAXLOGNAME); 385 case _SC_MONOTONIC_CLOCK: 386#if _POSIX_MONOTONIC_CLOCK == 0 387#error "_POSIX_MONOTONIC_CLOCK" 388#else 389 return (_POSIX_MONOTONIC_CLOCK); 390#endif 391#if _POSIX_MESSAGE_PASSING > -1 392 case _SC_MQ_PRIO_MAX: 393 return (MQ_PRIO_MAX); 394#endif 395 case _SC_READER_WRITER_LOCKS: 396 return (_POSIX_READER_WRITER_LOCKS); 397 case _SC_REGEXP: 398 return (_POSIX_REGEXP); 399 case _SC_SHELL: 400 return (_POSIX_SHELL); 401 case _SC_SPAWN: 402 return (_POSIX_SPAWN); 403 case _SC_SPIN_LOCKS: 404 return (_POSIX_SPIN_LOCKS); 405 case _SC_SPORADIC_SERVER: 406#if _POSIX_SPORADIC_SERVER == 0 407#error "_POSIX_SPORADIC_SERVER" 408#else 409 return (_POSIX_SPORADIC_SERVER); 410#endif 411 case _SC_THREAD_ATTR_STACKADDR: 412 return (_POSIX_THREAD_ATTR_STACKADDR); 413 case _SC_THREAD_ATTR_STACKSIZE: 414 return (_POSIX_THREAD_ATTR_STACKSIZE); 415 case _SC_THREAD_CPUTIME: 416 return (_POSIX_THREAD_CPUTIME); 417 case _SC_THREAD_DESTRUCTOR_ITERATIONS: 418 return (PTHREAD_DESTRUCTOR_ITERATIONS); 419 case _SC_THREAD_KEYS_MAX: 420 return (PTHREAD_KEYS_MAX); 421 case _SC_THREAD_PRIO_INHERIT: 422 return (_POSIX_THREAD_PRIO_INHERIT); 423 case _SC_THREAD_PRIO_PROTECT: 424 return (_POSIX_THREAD_PRIO_PROTECT); 425 case _SC_THREAD_PRIORITY_SCHEDULING: 426 return (_POSIX_THREAD_PRIORITY_SCHEDULING); 427 case _SC_THREAD_PROCESS_SHARED: 428 return (_POSIX_THREAD_PROCESS_SHARED); 429 case _SC_THREAD_SAFE_FUNCTIONS: 430 return (_POSIX_THREAD_SAFE_FUNCTIONS); 431 case _SC_THREAD_STACK_MIN: 432 return (PTHREAD_STACK_MIN); 433 case _SC_THREAD_THREADS_MAX: 434 return (PTHREAD_THREADS_MAX); /* XXX wrong type! */ 435 case _SC_TIMEOUTS: 436 return (_POSIX_TIMEOUTS); 437 case _SC_THREADS: 438 return (_POSIX_THREADS); 439 case _SC_TRACE: 440#if _POSIX_TRACE == 0 441#error "_POSIX_TRACE" 442 /* While you're implementing this, also do the ones below. */ 443#else 444 return (_POSIX_TRACE); 445#endif 446#if _POSIX_TRACE > -1 447 case _SC_TRACE_EVENT_FILTER: 448 return (_POSIX_TRACE_EVENT_FILTER); 449 case _SC_TRACE_INHERIT: 450 return (_POSIX_TRACE_INHERIT); 451 case _SC_TRACE_LOG: 452 return (_POSIX_TRACE_LOG); 453#endif 454 case _SC_TTY_NAME_MAX: 455 path = _PATH_DEV; 456 goto do_NAME_MAX; 457 case _SC_TYPED_MEMORY_OBJECTS: 458#if _POSIX_TYPED_MEMORY_OBJECTS == 0 459#error "_POSIX_TYPED_MEMORY_OBJECTS" 460#else 461 return (_POSIX_TYPED_MEMORY_OBJECTS); 462#endif 463 case _SC_V6_ILP32_OFF32: 464#if _V6_ILP32_OFF32 == 0 465 if (sizeof(int) * CHAR_BIT == 32 && 466 sizeof(int) == sizeof(long) && 467 sizeof(long) == sizeof(void *) && 468 sizeof(void *) == sizeof(off_t)) 469 return 1; 470 else 471 return -1; 472#else 473 return (_V6_ILP32_OFF32); 474#endif 475 case _SC_V6_ILP32_OFFBIG: 476#if _V6_ILP32_OFFBIG == 0 477 if (sizeof(int) * CHAR_BIT == 32 && 478 sizeof(int) == sizeof(long) && 479 sizeof(long) == sizeof(void *) && 480 sizeof(off_t) * CHAR_BIT >= 64) 481 return 1; 482 else 483 return -1; 484#else 485 return (_V6_ILP32_OFFBIG); 486#endif 487 case _SC_V6_LP64_OFF64: 488#if _V6_LP64_OFF64 == 0 489 if (sizeof(int) * CHAR_BIT == 32 && 490 sizeof(long) * CHAR_BIT == 64 && 491 sizeof(long) == sizeof(void *) && 492 sizeof(void *) == sizeof(off_t)) 493 return 1; 494 else 495 return -1; 496#else 497 return (_V6_LP64_OFF64); 498#endif 499 case _SC_V6_LPBIG_OFFBIG: 500#if _V6_LPBIG_OFFBIG == 0 501 if (sizeof(int) * CHAR_BIT >= 32 && 502 sizeof(long) * CHAR_BIT >= 64 && 503 sizeof(void *) * CHAR_BIT >= 64 && 504 sizeof(off_t) * CHAR_BIT >= 64) 505 return 1; 506 else 507 return -1; 508#else 509 return (_V6_LPBIG_OFFBIG); 510#endif 511 case _SC_ATEXIT_MAX: 512 return (ATEXIT_SIZE); 513 case _SC_IOV_MAX: 514 mib[0] = CTL_KERN; 515 mib[1] = KERN_IOV_MAX; 516 break; 517 case _SC_XOPEN_CRYPT: 518 return (_XOPEN_CRYPT); 519 case _SC_XOPEN_ENH_I18N: 520 return (_XOPEN_ENH_I18N); 521 case _SC_XOPEN_LEGACY: 522 return (_XOPEN_LEGACY); 523 case _SC_XOPEN_REALTIME: 524#if _XOPEN_REALTIME == 0 525 sverrno = errno; 526 value = sysconf(_SC_ASYNCHRONOUS_IO) > 0 && 527 sysconf(_SC_MEMLOCK) > 0 && 528 sysconf(_SC_MEMLOCK_RANGE) > 0 && 529 sysconf(_SC_MESSAGE_PASSING) > 0 && 530 sysconf(_SC_PRIORITY_SCHEDULING) > 0 && 531 sysconf(_SC_REALTIME_SIGNALS) > 0 && 532 sysconf(_SC_SEMAPHORES) > 0 && 533 sysconf(_SC_SHARED_MEMORY_OBJECTS) > 0 && 534 sysconf(_SC_SYNCHRONIZED_IO) > 0 && 535 sysconf(_SC_TIMERS) > 0; 536 errno = sverrno; 537 if (value) 538 return (200112L); 539 else 540 return (-1); 541#else 542 return (_XOPEN_REALTIME); 543#endif 544 case _SC_XOPEN_REALTIME_THREADS: 545#if _XOPEN_REALTIME_THREADS == 0 546#error "_XOPEN_REALTIME_THREADS" 547#else 548 return (_XOPEN_REALTIME_THREADS); 549#endif 550 case _SC_XOPEN_SHM: 551 len = sizeof(lvalue); 552 sverrno = errno; 553 if (sysctlbyname("kern.ipc.shmmin", &lvalue, &len, NULL, 554 0) == -1) { 555 errno = sverrno; 556 return (-1); 557 } 558 errno = sverrno; 559 return (1); 560 case _SC_XOPEN_STREAMS: 561 return (_XOPEN_STREAMS); 562 case _SC_XOPEN_UNIX: 563 return (_XOPEN_UNIX); 564#ifdef _XOPEN_VERSION 565 case _SC_XOPEN_VERSION: 566 return (_XOPEN_VERSION); 567#endif 568#ifdef _XOPEN_XCU_VERSION 569 case _SC_XOPEN_XCU_VERSION: 570 return (_XOPEN_XCU_VERSION); 571#endif 572 case _SC_SYMLOOP_MAX: 573 return (MAXSYMLINKS); 574 case _SC_RAW_SOCKETS: 575 return (_POSIX_RAW_SOCKETS); 576 case _SC_IPV6: 577#if _POSIX_IPV6 == 0 578 sverrno = errno; 579 value = socket(PF_INET6, SOCK_DGRAM, 0); 580 errno = sverrno; 581 if (value >= 0) { 582 close(value); 583 return (200112L); 584 } else 585 return (0); 586#else 587 return (_POSIX_IPV6); 588#endif 589 590 case _SC_NPROCESSORS_CONF: 591 case _SC_NPROCESSORS_ONLN: 592 if (_elf_aux_info(AT_NCPUS, &value, sizeof(value)) == 0) 593 return ((long)value); 594 mib[0] = CTL_HW; 595 mib[1] = HW_NCPU; 596 break; 597 598#ifdef _SC_PHYS_PAGES 599 case _SC_PHYS_PAGES: 600 len = sizeof(lvalue); 601 if (sysctlbyname("hw.availpages", &lvalue, &len, NULL, 0) == -1) 602 return (-1); 603 return (lvalue); 604#endif 605 606#ifdef _SC_CPUSET_SIZE 607 case _SC_CPUSET_SIZE: 608 len = sizeof(value); 609 if (sysctlbyname("kern.sched.cpusetsize", &value, &len, NULL, 610 0) == -1) 611 return (-1); 612 return ((long)value); 613#endif 614 615 default: 616 errno = EINVAL; 617 return (-1); 618 } 619 len = sizeof(value); 620 if (sysctl(mib, 2, &value, &len, NULL, 0) == -1) 621 value = -1; 622 return ((long)value); 623} 624