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 case _SC_GETGR_R_SIZE_MAX: 359 case _SC_GETPW_R_SIZE_MAX: 360 return (-1); 361 case _SC_HOST_NAME_MAX: 362 return (MAXHOSTNAMELEN - 1); /* does not include \0 */ 363 case _SC_LOGIN_NAME_MAX: 364 return (MAXLOGNAME); 365 case _SC_MONOTONIC_CLOCK: 366 #if _POSIX_MONOTONIC_CLOCK == 0 367 #error "_POSIX_MONOTONIC_CLOCK" 368 #else 369 return (_POSIX_MONOTONIC_CLOCK); 370 #endif 371 case _SC_MQ_OPEN_MAX: 372 len = sizeof(lvalue); 373 if (sysctlbyname("kern.mqueue.mq_open_max", &lvalue, &len, 374 NULL, 0) == -1) 375 return (-1); 376 return (lvalue); 377 378 case _SC_MQ_PRIO_MAX: 379 len = sizeof(lvalue); 380 if (sysctlbyname("kern.mqueue.mq_prio_max", &lvalue, &len, 381 NULL, 0) == -1) 382 return (-1); 383 return (lvalue); 384 385 case _SC_READER_WRITER_LOCKS: 386 return (_POSIX_READER_WRITER_LOCKS); 387 case _SC_REGEXP: 388 return (_POSIX_REGEXP); 389 case _SC_SHELL: 390 return (_POSIX_SHELL); 391 case _SC_SPAWN: 392 return (_POSIX_SPAWN); 393 case _SC_SPIN_LOCKS: 394 return (_POSIX_SPIN_LOCKS); 395 case _SC_SPORADIC_SERVER: 396 #if _POSIX_SPORADIC_SERVER == 0 397 #error "_POSIX_SPORADIC_SERVER" 398 #else 399 return (_POSIX_SPORADIC_SERVER); 400 #endif 401 case _SC_THREAD_ATTR_STACKADDR: 402 return (_POSIX_THREAD_ATTR_STACKADDR); 403 case _SC_THREAD_ATTR_STACKSIZE: 404 return (_POSIX_THREAD_ATTR_STACKSIZE); 405 case _SC_THREAD_CPUTIME: 406 return (_POSIX_THREAD_CPUTIME); 407 case _SC_THREAD_DESTRUCTOR_ITERATIONS: 408 return (PTHREAD_DESTRUCTOR_ITERATIONS); 409 case _SC_THREAD_KEYS_MAX: 410 return (PTHREAD_KEYS_MAX); 411 case _SC_THREAD_PRIO_INHERIT: 412 return (_POSIX_THREAD_PRIO_INHERIT); 413 case _SC_THREAD_PRIO_PROTECT: 414 return (_POSIX_THREAD_PRIO_PROTECT); 415 case _SC_THREAD_PRIORITY_SCHEDULING: 416 return (_POSIX_THREAD_PRIORITY_SCHEDULING); 417 case _SC_THREAD_PROCESS_SHARED: 418 return (_POSIX_THREAD_PROCESS_SHARED); 419 case _SC_THREAD_ROBUST_PRIO_INHERIT: 420 return (_POSIX_THREAD_ROBUST_PRIO_INHERIT); 421 case _SC_THREAD_ROBUST_PRIO_PROTECT: 422 return (_POSIX_THREAD_ROBUST_PRIO_PROTECT); 423 case _SC_THREAD_SAFE_FUNCTIONS: 424 return (_POSIX_THREAD_SAFE_FUNCTIONS); 425 case _SC_THREAD_SPORADIC_SERVER: 426 return (_POSIX_THREAD_SPORADIC_SERVER); 427 case _SC_THREAD_STACK_MIN: 428 return (PTHREAD_STACK_MIN); 429 case _SC_THREAD_THREADS_MAX: 430 return (PTHREAD_THREADS_MAX); /* XXX wrong type! */ 431 case _SC_TIMEOUTS: 432 return (_POSIX_TIMEOUTS); 433 case _SC_THREADS: 434 return (_POSIX_THREADS); 435 case _SC_TRACE: 436 #if _POSIX_TRACE == 0 437 #error "_POSIX_TRACE" 438 /* While you're implementing this, also do the ones below. */ 439 #else 440 return (_POSIX_TRACE); 441 #endif 442 #if _POSIX_TRACE > -1 443 case _SC_TRACE_EVENT_FILTER: 444 return (_POSIX_TRACE_EVENT_FILTER); 445 case _SC_TRACE_INHERIT: 446 return (_POSIX_TRACE_INHERIT); 447 case _SC_TRACE_LOG: 448 return (_POSIX_TRACE_LOG); 449 #endif 450 case _SC_TTY_NAME_MAX: 451 path = _PATH_DEV; 452 goto do_NAME_MAX; 453 case _SC_TYPED_MEMORY_OBJECTS: 454 #if _POSIX_TYPED_MEMORY_OBJECTS == 0 455 #error "_POSIX_TYPED_MEMORY_OBJECTS" 456 #else 457 return (_POSIX_TYPED_MEMORY_OBJECTS); 458 #endif 459 case _SC_V6_ILP32_OFF32: 460 #if _V6_ILP32_OFF32 == 0 461 if (sizeof(int) * CHAR_BIT == 32 && 462 sizeof(int) == sizeof(long) && 463 sizeof(long) == sizeof(void *) && 464 sizeof(void *) == sizeof(off_t)) 465 return 1; 466 else 467 return -1; 468 #else 469 return (_V6_ILP32_OFF32); 470 #endif 471 case _SC_V6_ILP32_OFFBIG: 472 #if _V6_ILP32_OFFBIG == 0 473 if (sizeof(int) * CHAR_BIT == 32 && 474 sizeof(int) == sizeof(long) && 475 sizeof(long) == sizeof(void *) && 476 sizeof(off_t) * CHAR_BIT >= 64) 477 return 1; 478 else 479 return -1; 480 #else 481 return (_V6_ILP32_OFFBIG); 482 #endif 483 case _SC_V6_LP64_OFF64: 484 #if _V6_LP64_OFF64 == 0 485 if (sizeof(int) * CHAR_BIT == 32 && 486 sizeof(long) * CHAR_BIT == 64 && 487 sizeof(long) == sizeof(void *) && 488 sizeof(void *) == sizeof(off_t)) 489 return 1; 490 else 491 return -1; 492 #else 493 return (_V6_LP64_OFF64); 494 #endif 495 case _SC_V6_LPBIG_OFFBIG: 496 #if _V6_LPBIG_OFFBIG == 0 497 if (sizeof(int) * CHAR_BIT >= 32 && 498 sizeof(long) * CHAR_BIT >= 64 && 499 sizeof(void *) * CHAR_BIT >= 64 && 500 sizeof(off_t) * CHAR_BIT >= 64) 501 return 1; 502 else 503 return -1; 504 #else 505 return (_V6_LPBIG_OFFBIG); 506 #endif 507 case _SC_V7_ILP32_OFF32: 508 #if _V7_ILP32_OFF32 == 0 509 if (sizeof(int) * CHAR_BIT == 32 && 510 sizeof(int) == sizeof(long) && 511 sizeof(long) == sizeof(void *) && 512 sizeof(void *) == sizeof(off_t)) 513 return 1; 514 else 515 return -1; 516 #else 517 return (_V7_ILP32_OFF32); 518 #endif 519 case _SC_V7_ILP32_OFFBIG: 520 #if _V7_ILP32_OFFBIG == 0 521 if (sizeof(int) * CHAR_BIT == 32 && 522 sizeof(int) == sizeof(long) && 523 sizeof(long) == sizeof(void *) && 524 sizeof(off_t) * CHAR_BIT >= 64) 525 return 1; 526 else 527 return -1; 528 #else 529 return (_V7_ILP32_OFFBIG); 530 #endif 531 case _SC_V7_LP64_OFF64: 532 #if _V7_LP64_OFF64 == 0 533 if (sizeof(int) * CHAR_BIT == 32 && 534 sizeof(long) * CHAR_BIT == 64 && 535 sizeof(long) == sizeof(void *) && 536 sizeof(void *) == sizeof(off_t)) 537 return 1; 538 else 539 return -1; 540 #else 541 return (_V7_LP64_OFF64); 542 #endif 543 case _SC_V7_LPBIG_OFFBIG: 544 #if _V7_LPBIG_OFFBIG == 0 545 if (sizeof(int) * CHAR_BIT >= 32 && 546 sizeof(long) * CHAR_BIT >= 64 && 547 sizeof(void *) * CHAR_BIT >= 64 && 548 sizeof(off_t) * CHAR_BIT >= 64) 549 return 1; 550 else 551 return -1; 552 #else 553 return (_V7_LPBIG_OFFBIG); 554 #endif 555 case _SC_ATEXIT_MAX: 556 return (ATEXIT_SIZE); 557 case _SC_IOV_MAX: 558 mib[0] = CTL_KERN; 559 mib[1] = KERN_IOV_MAX; 560 break; 561 case _SC_XOPEN_CRYPT: 562 return (_XOPEN_CRYPT); 563 case _SC_XOPEN_ENH_I18N: 564 return (_XOPEN_ENH_I18N); 565 case _SC_XOPEN_LEGACY: 566 return (_XOPEN_LEGACY); 567 case _SC_XOPEN_REALTIME: 568 #if _XOPEN_REALTIME == 0 569 sverrno = errno; 570 value = sysconf(_SC_ASYNCHRONOUS_IO) > 0 && 571 sysconf(_SC_MEMLOCK) > 0 && 572 sysconf(_SC_MEMLOCK_RANGE) > 0 && 573 sysconf(_SC_MESSAGE_PASSING) > 0 && 574 sysconf(_SC_PRIORITY_SCHEDULING) > 0 && 575 sysconf(_SC_REALTIME_SIGNALS) > 0 && 576 sysconf(_SC_SEMAPHORES) > 0 && 577 sysconf(_SC_SHARED_MEMORY_OBJECTS) > 0 && 578 sysconf(_SC_SYNCHRONIZED_IO) > 0 && 579 sysconf(_SC_TIMERS) > 0; 580 errno = sverrno; 581 if (value) 582 return (200112L); 583 else 584 return (-1); 585 #else 586 return (_XOPEN_REALTIME); 587 #endif 588 case _SC_XOPEN_REALTIME_THREADS: 589 #if _XOPEN_REALTIME_THREADS == 0 590 #error "_XOPEN_REALTIME_THREADS" 591 #else 592 return (_XOPEN_REALTIME_THREADS); 593 #endif 594 case _SC_XOPEN_SHM: 595 return (_XOPEN_SHM); 596 case _SC_XOPEN_STREAMS: 597 return (_XOPEN_STREAMS); 598 case _SC_XOPEN_UNIX: 599 return (_XOPEN_UNIX); 600 #ifdef _XOPEN_VERSION 601 case _SC_XOPEN_VERSION: 602 return (_XOPEN_VERSION); 603 #endif 604 #ifdef _XOPEN_XCU_VERSION 605 case _SC_XOPEN_XCU_VERSION: 606 return (_XOPEN_XCU_VERSION); 607 #endif 608 case _SC_SYMLOOP_MAX: 609 return (MAXSYMLINKS); 610 case _SC_RAW_SOCKETS: 611 return (_POSIX_RAW_SOCKETS); 612 case _SC_IPV6: 613 #if _POSIX_IPV6 == 0 614 sverrno = errno; 615 value = socket(PF_INET6, SOCK_DGRAM, 0); 616 errno = sverrno; 617 if (value >= 0) { 618 close(value); 619 return (200112L); 620 } else 621 return (0); 622 #else 623 return (_POSIX_IPV6); 624 #endif 625 626 case _SC_NPROCESSORS_CONF: 627 case _SC_NPROCESSORS_ONLN: 628 mib[0] = CTL_HW; 629 mib[1] = HW_NCPU; 630 break; 631 632 #ifdef _SC_PHYS_PAGES 633 case _SC_PHYS_PAGES: 634 len = sizeof(lvalue); 635 if (sysctlbyname("hw.availpages", &lvalue, &len, NULL, 0) == -1) 636 return (-1); 637 return (lvalue); 638 #endif 639 640 default: 641 errno = EINVAL; 642 return (-1); 643 } 644 len = sizeof(value); 645 if (sysctl(mib, 2, &value, &len, NULL, 0) == -1) 646 value = -1; 647 return ((long)value); 648 } 649