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("$FreeBSD$");
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 */
73 long
sysconf(int name)74 sysconf(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;
186 do_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;
316 yesno:
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