1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Sean Eric Fagan of Cygnus Support.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35 #include "namespace.h"
36 #include <sys/param.h>
37 #include <sys/exterrvar.h>
38 #include <sys/time.h>
39 #include <sys/sysctl.h>
40 #include <sys/resource.h>
41 #include <sys/socket.h>
42
43 #include <elf.h>
44 #include <errno.h>
45 #include <limits.h>
46 #include <paths.h>
47 #include <pthread.h> /* we just need the limits */
48 #include <semaphore.h>
49 #include <time.h>
50 #include <unistd.h>
51 #include "un-namespace.h"
52
53 #include "../stdlib/atexit.h"
54 #include "tzdir.h" /* from ../../../contrib/tzcode */
55 #include "libc_private.h"
56
57 #define _PATH_ZONEINFO TZDIR /* from tzfile.h */
58
59 /*
60 * sysconf --
61 * get configurable system variables.
62 *
63 * XXX
64 * POSIX 1003.1 (ISO/IEC 9945-1, 4.8.1.3) states that the variable values
65 * not change during the lifetime of the calling process. This would seem
66 * to require that any change to system limits kill all running processes.
67 * A workaround might be to cache the values when they are first retrieved
68 * and then simply return the cached value on subsequent calls. This is
69 * less useful than returning up-to-date values, however.
70 */
71 long
sysconf(int name)72 sysconf(int name)
73 {
74 struct rlimit rl;
75 cpuset_t cpus;
76 size_t len;
77 int mib[2], sverrno, value;
78 long lvalue, defaultresult;
79 const char *path;
80
81 defaultresult = -1;
82
83 switch (name) {
84 case _SC_ARG_MAX:
85 mib[0] = CTL_KERN;
86 mib[1] = KERN_ARGMAX;
87 break;
88 case _SC_CHILD_MAX:
89 if (getrlimit(RLIMIT_NPROC, &rl) != 0)
90 return (-1);
91 if (rl.rlim_cur == RLIM_INFINITY)
92 return (-1);
93 if (rl.rlim_cur > LONG_MAX) {
94 errno = EOVERFLOW;
95 return (-1);
96 }
97 return ((long)rl.rlim_cur);
98 case _SC_CLK_TCK:
99 return (CLK_TCK);
100 case _SC_NGROUPS_MAX:
101 mib[0] = CTL_KERN;
102 mib[1] = KERN_NGROUPS;
103 break;
104 case _SC_OPEN_MAX:
105 if (getrlimit(RLIMIT_NOFILE, &rl) != 0)
106 return (-1);
107 if (rl.rlim_cur == RLIM_INFINITY)
108 return (-1);
109 if (rl.rlim_cur > LONG_MAX) {
110 errno = EOVERFLOW;
111 return (-1);
112 }
113 return ((long)rl.rlim_cur);
114 case _SC_STREAM_MAX:
115 if (getrlimit(RLIMIT_NOFILE, &rl) != 0)
116 return (-1);
117 if (rl.rlim_cur == RLIM_INFINITY)
118 return (-1);
119 if (rl.rlim_cur > LONG_MAX) {
120 errno = EOVERFLOW;
121 return (-1);
122 }
123 /*
124 * struct __sFILE currently has a limitation that
125 * file descriptors must fit in a signed short.
126 * This doesn't precisely capture the letter of POSIX
127 * but approximates the spirit.
128 */
129 if (rl.rlim_cur > SHRT_MAX)
130 return (SHRT_MAX);
131
132 return ((long)rl.rlim_cur);
133 case _SC_JOB_CONTROL:
134 return (_POSIX_JOB_CONTROL);
135 case _SC_SAVED_IDS:
136 /* XXX - must be 1 */
137 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;
185 do_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_NSIG:
292 return (_SIG_MAXSIG);
293 case _SC_PAGESIZE:
294 return (getpagesize());
295 case _SC_RTSIG_MAX:
296 mib[0] = CTL_P1003_1B;
297 mib[1] = CTL_P1003_1B_RTSIG_MAX;
298 goto yesno;
299 case _SC_SEM_NSEMS_MAX:
300 return (-1);
301 case _SC_SEM_VALUE_MAX:
302 return (SEM_VALUE_MAX);
303 case _SC_SIGQUEUE_MAX:
304 mib[0] = CTL_P1003_1B;
305 mib[1] = CTL_P1003_1B_SIGQUEUE_MAX;
306 goto yesno;
307 case _SC_TIMER_MAX:
308 mib[0] = CTL_P1003_1B;
309 mib[1] = CTL_P1003_1B_TIMER_MAX;
310 yesno:
311 len = sizeof(value);
312 if (sysctl(mib, 2, &value, &len, NULL, 0) == -1)
313 return (-1);
314 if (value == 0)
315 return (defaultresult);
316 return ((long)value);
317
318 case _SC_2_PBS:
319 case _SC_2_PBS_ACCOUNTING:
320 case _SC_2_PBS_CHECKPOINT:
321 case _SC_2_PBS_LOCATE:
322 case _SC_2_PBS_MESSAGE:
323 case _SC_2_PBS_TRACK:
324 #if _POSIX2_PBS == 0
325 #error "don't know how to determine _SC_2_PBS"
326 /*
327 * This probably requires digging through the filesystem
328 * to see if the appropriate package has been installed.
329 * Since we don't currently support this option at all,
330 * it's not worth the effort to write the code now.
331 * Figuring out which of the sub-options are supported
332 * would be even more difficult, so it's probably easier
333 * to always say ``no''.
334 */
335 #else
336 return (_POSIX2_PBS);
337 #endif
338 case _SC_ADVISORY_INFO:
339 #if _POSIX_ADVISORY_INFO == 0
340 #error "_POSIX_ADVISORY_INFO"
341 #else
342 return (_POSIX_ADVISORY_INFO);
343 #endif
344 case _SC_BARRIERS:
345 #if _POSIX_BARRIERS == 0
346 #error "_POSIX_BARRIERS"
347 #else
348 return (_POSIX_BARRIERS);
349 #endif
350 case _SC_CLOCK_SELECTION:
351 #if _POSIX_CLOCK_SELECTION == 0
352 #error "_POSIX_CLOCK_SELECTION"
353 #else
354 return (_POSIX_CLOCK_SELECTION);
355 #endif
356 case _SC_CPUTIME:
357 return (_POSIX_CPUTIME);
358 #ifdef notdef
359 case _SC_FILE_LOCKING:
360 /*
361 * XXX - The standard doesn't tell us how to define
362 * _POSIX_FILE_LOCKING, so we can't answer this one.
363 */
364 #endif
365
366 /*
367 * SUSv4tc1 says the following about _SC_GETGR_R_SIZE_MAX and
368 * _SC_GETPW_R_SIZE_MAX:
369 * Note that sysconf(_SC_GETGR_R_SIZE_MAX) may return -1 if
370 * there is no hard limit on the size of the buffer needed to
371 * store all the groups returned.
372 */
373 case _SC_GETGR_R_SIZE_MAX:
374 case _SC_GETPW_R_SIZE_MAX:
375 return (-1);
376 case _SC_HOST_NAME_MAX:
377 return (MAXHOSTNAMELEN - 1); /* does not include \0 */
378 case _SC_LOGIN_NAME_MAX:
379 return (MAXLOGNAME);
380 case _SC_MONOTONIC_CLOCK:
381 #if _POSIX_MONOTONIC_CLOCK == 0
382 #error "_POSIX_MONOTONIC_CLOCK"
383 #else
384 return (_POSIX_MONOTONIC_CLOCK);
385 #endif
386 #if _POSIX_MESSAGE_PASSING > -1
387 case _SC_MQ_PRIO_MAX:
388 return (MQ_PRIO_MAX);
389 #endif
390 case _SC_READER_WRITER_LOCKS:
391 return (_POSIX_READER_WRITER_LOCKS);
392 case _SC_REGEXP:
393 return (_POSIX_REGEXP);
394 case _SC_SHELL:
395 return (_POSIX_SHELL);
396 case _SC_SPAWN:
397 return (_POSIX_SPAWN);
398 case _SC_SPIN_LOCKS:
399 return (_POSIX_SPIN_LOCKS);
400 case _SC_SPORADIC_SERVER:
401 #if _POSIX_SPORADIC_SERVER == 0
402 #error "_POSIX_SPORADIC_SERVER"
403 #else
404 return (_POSIX_SPORADIC_SERVER);
405 #endif
406 case _SC_THREAD_ATTR_STACKADDR:
407 return (_POSIX_THREAD_ATTR_STACKADDR);
408 case _SC_THREAD_ATTR_STACKSIZE:
409 return (_POSIX_THREAD_ATTR_STACKSIZE);
410 case _SC_THREAD_CPUTIME:
411 return (_POSIX_THREAD_CPUTIME);
412 case _SC_THREAD_DESTRUCTOR_ITERATIONS:
413 return (PTHREAD_DESTRUCTOR_ITERATIONS);
414 case _SC_THREAD_KEYS_MAX:
415 return (PTHREAD_KEYS_MAX);
416 case _SC_THREAD_PRIO_INHERIT:
417 return (_POSIX_THREAD_PRIO_INHERIT);
418 case _SC_THREAD_PRIO_PROTECT:
419 return (_POSIX_THREAD_PRIO_PROTECT);
420 case _SC_THREAD_PRIORITY_SCHEDULING:
421 return (_POSIX_THREAD_PRIORITY_SCHEDULING);
422 case _SC_THREAD_PROCESS_SHARED:
423 return (_POSIX_THREAD_PROCESS_SHARED);
424 case _SC_THREAD_SAFE_FUNCTIONS:
425 return (_POSIX_THREAD_SAFE_FUNCTIONS);
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_ATEXIT_MAX:
507 return (ATEXIT_SIZE);
508 case _SC_IOV_MAX:
509 mib[0] = CTL_KERN;
510 mib[1] = KERN_IOV_MAX;
511 break;
512 case _SC_XOPEN_CRYPT:
513 return (_XOPEN_CRYPT);
514 case _SC_XOPEN_ENH_I18N:
515 return (_XOPEN_ENH_I18N);
516 case _SC_XOPEN_LEGACY:
517 return (_XOPEN_LEGACY);
518 case _SC_XOPEN_REALTIME:
519 #if _XOPEN_REALTIME == 0
520 sverrno = errno;
521 value = sysconf(_SC_ASYNCHRONOUS_IO) > 0 &&
522 sysconf(_SC_MEMLOCK) > 0 &&
523 sysconf(_SC_MEMLOCK_RANGE) > 0 &&
524 sysconf(_SC_MESSAGE_PASSING) > 0 &&
525 sysconf(_SC_PRIORITY_SCHEDULING) > 0 &&
526 sysconf(_SC_REALTIME_SIGNALS) > 0 &&
527 sysconf(_SC_SEMAPHORES) > 0 &&
528 sysconf(_SC_SHARED_MEMORY_OBJECTS) > 0 &&
529 sysconf(_SC_SYNCHRONIZED_IO) > 0 &&
530 sysconf(_SC_TIMERS) > 0;
531 errno = sverrno;
532 if (value)
533 return (200112L);
534 else
535 return (-1);
536 #else
537 return (_XOPEN_REALTIME);
538 #endif
539 case _SC_XOPEN_REALTIME_THREADS:
540 #if _XOPEN_REALTIME_THREADS == 0
541 #error "_XOPEN_REALTIME_THREADS"
542 #else
543 return (_XOPEN_REALTIME_THREADS);
544 #endif
545 case _SC_XOPEN_SHM:
546 len = sizeof(lvalue);
547 sverrno = errno;
548 if (sysctlbyname("kern.ipc.shmmin", &lvalue, &len, NULL,
549 0) == -1) {
550 errno = sverrno;
551 return (-1);
552 }
553 errno = sverrno;
554 return (1);
555 case _SC_XOPEN_STREAMS:
556 return (_XOPEN_STREAMS);
557 case _SC_XOPEN_UNIX:
558 return (_XOPEN_UNIX);
559 #ifdef _XOPEN_VERSION
560 case _SC_XOPEN_VERSION:
561 return (_XOPEN_VERSION);
562 #endif
563 #ifdef _XOPEN_XCU_VERSION
564 case _SC_XOPEN_XCU_VERSION:
565 return (_XOPEN_XCU_VERSION);
566 #endif
567 case _SC_SYMLOOP_MAX:
568 return (MAXSYMLINKS);
569 case _SC_RAW_SOCKETS:
570 return (_POSIX_RAW_SOCKETS);
571 case _SC_IPV6:
572 #if _POSIX_IPV6 == 0
573 sverrno = errno;
574 value = _socket(PF_INET6, SOCK_CLOEXEC | SOCK_DGRAM, 0);
575 errno = sverrno;
576 if (value >= 0) {
577 _close(value);
578 return (200112L);
579 } else
580 return (0);
581 #else
582 return (_POSIX_IPV6);
583 #endif
584
585 case _SC_NPROCESSORS_ONLN:
586 /*
587 * Consult our root set first, because our CPU availability
588 * may not match the total number of CPUs available on the
589 * system and we may have a non-uniform layout even within
590 * userland. In particular, each jail has a root set that can
591 * be constrained by its parent and processes within the jail
592 * cannot widen beyond those constraints, so to those processes
593 * it makes sense to claim the more limited count.
594 */
595 if (cpuset_getaffinity(CPU_LEVEL_ROOT, CPU_WHICH_PID, -1,
596 sizeof(cpus), &cpus) == 0)
597 return (CPU_COUNT(&cpus));
598 /* FALLTHROUGH */
599 case _SC_NPROCESSORS_CONF:
600 if (_elf_aux_info(AT_NCPUS, &value, sizeof(value)) == 0)
601 return ((long)value);
602 mib[0] = CTL_HW;
603 mib[1] = HW_NCPU;
604 break;
605
606 #ifdef _SC_PHYS_PAGES
607 case _SC_PHYS_PAGES:
608 len = sizeof(lvalue);
609 if (sysctlbyname("hw.availpages", &lvalue, &len, NULL, 0) == -1)
610 return (-1);
611 return (lvalue);
612 #endif
613
614 #ifdef _SC_CPUSET_SIZE
615 case _SC_CPUSET_SIZE:
616 len = sizeof(value);
617 if (sysctlbyname("kern.sched.cpusetsize", &value, &len, NULL,
618 0) == -1)
619 return (-1);
620 return ((long)value);
621 #endif
622 case _SC_UEXTERR_MAXLEN:
623 return (UEXTERROR_MAXLEN);
624
625 default:
626 errno = EINVAL;
627 return (-1);
628 }
629 len = sizeof(value);
630 if (sysctl(mib, 2, &value, &len, NULL, 0) == -1)
631 value = -1;
632 return ((long)value);
633 }
634