2 * SPDX-License-Identifier: BSD-3-Clause
5 * The Regents of the University of California. All rights reserved.
7 * This code is derived from software contributed to Berkeley by
8 * Sean Eric Fagan of Cygnus Support.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
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.
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
35 #include <sys/cdefs.h>
36 __SCCSID("@(#)sysconf.c 8.2 (Berkeley) 3/20/94");
37 __FBSDID("$FreeBSD$");
39 #include "namespace.h"
40 #include <sys/param.h>
42 #include <sys/sysctl.h>
43 #include <sys/resource.h>
44 #include <sys/socket.h>
50 #include <pthread.h> /* we just need the limits */
51 #include <semaphore.h>
54 #include "un-namespace.h"
56 #include "../stdlib/atexit.h"
57 #include "tzfile.h" /* from ../../../contrib/tzcode/stdtime */
58 #include "libc_private.h"
60 #define _PATH_ZONEINFO TZDIR /* from tzfile.h */
64 * get configurable system variables.
67 * POSIX 1003.1 (ISO/IEC 9945-1, 4.8.1.3) states that the variable values
68 * not change during the lifetime of the calling process. This would seem
69 * to require that any change to system limits kill all running processes.
70 * A workaround might be to cache the values when they are first retrieved
71 * and then simply return the cached value on subsequent calls. This is
72 * less useful than returning up-to-date values, however.
79 int mib[2], sverrno, value;
80 long lvalue, defaultresult;
91 if (getrlimit(RLIMIT_NPROC, &rl) != 0)
93 if (rl.rlim_cur == RLIM_INFINITY)
95 if (rl.rlim_cur > LONG_MAX) {
99 return ((long)rl.rlim_cur);
102 case _SC_NGROUPS_MAX:
104 mib[1] = KERN_NGROUPS;
107 if (getrlimit(RLIMIT_NOFILE, &rl) != 0)
109 if (rl.rlim_cur == RLIM_INFINITY)
111 if (rl.rlim_cur > LONG_MAX) {
115 return ((long)rl.rlim_cur);
117 if (getrlimit(RLIMIT_NOFILE, &rl) != 0)
119 if (rl.rlim_cur == RLIM_INFINITY)
121 if (rl.rlim_cur > LONG_MAX) {
126 * struct __sFILE currently has a limitation that
127 * file descriptors must fit in a signed short.
128 * This doesn't precisely capture the letter of POSIX
129 * but approximates the spirit.
131 if (rl.rlim_cur > SHRT_MAX)
134 return ((long)rl.rlim_cur);
135 case _SC_JOB_CONTROL:
136 return (_POSIX_JOB_CONTROL);
138 /* XXX - must be 1 */
140 mib[1] = KERN_SAVED_IDS;
144 mib[1] = KERN_POSIX1;
146 case _SC_BC_BASE_MAX:
147 return (BC_BASE_MAX);
150 case _SC_BC_SCALE_MAX:
151 return (BC_SCALE_MAX);
152 case _SC_BC_STRING_MAX:
153 return (BC_STRING_MAX);
154 case _SC_COLL_WEIGHTS_MAX:
155 return (COLL_WEIGHTS_MAX);
156 case _SC_EXPR_NEST_MAX:
157 return (EXPR_NEST_MAX);
164 * This is something of a lie, but it would be silly at
165 * this point to try to deduce this from the contents
168 return (_POSIX2_VERSION);
170 return (_POSIX2_C_BIND);
172 return (_POSIX2_C_DEV);
173 case _SC_2_CHAR_TERM:
174 return (_POSIX2_CHAR_TERM);
176 return (_POSIX2_FORT_DEV);
178 return (_POSIX2_FORT_RUN);
179 case _SC_2_LOCALEDEF:
180 return (_POSIX2_LOCALEDEF);
182 return (_POSIX2_SW_DEV);
184 return (_POSIX2_UPE);
186 path = _PATH_ZONEINFO;
190 lvalue = pathconf(path, _PC_NAME_MAX);
191 if (lvalue == -1 && errno != 0)
196 case _SC_ASYNCHRONOUS_IO:
197 #if _POSIX_ASYNCHRONOUS_IO == 0
198 mib[0] = CTL_P1003_1B;
199 mib[1] = CTL_P1003_1B_ASYNCHRONOUS_IO;
202 return (_POSIX_ASYNCHRONOUS_IO);
204 case _SC_MAPPED_FILES:
205 return (_POSIX_MAPPED_FILES);
207 return (_POSIX_MEMLOCK);
208 case _SC_MEMLOCK_RANGE:
209 return (_POSIX_MEMLOCK_RANGE);
210 case _SC_MEMORY_PROTECTION:
211 return (_POSIX_MEMORY_PROTECTION);
212 case _SC_MESSAGE_PASSING:
213 #if _POSIX_MESSAGE_PASSING == 0
214 mib[0] = CTL_P1003_1B;
215 mib[1] = CTL_P1003_1B_MESSAGE_PASSING;
218 return (_POSIX_MESSAGE_PASSING);
220 case _SC_PRIORITIZED_IO:
221 #if _POSIX_PRIORITIZED_IO == 0
222 mib[0] = CTL_P1003_1B;
223 mib[1] = CTL_P1003_1B_PRIORITIZED_IO;
226 return (_POSIX_PRIORITIZED_IO);
228 case _SC_PRIORITY_SCHEDULING:
229 #if _POSIX_PRIORITY_SCHEDULING == 0
230 mib[0] = CTL_P1003_1B;
231 mib[1] = CTL_P1003_1B_PRIORITY_SCHEDULING;
234 return (_POSIX_PRIORITY_SCHEDULING);
236 case _SC_REALTIME_SIGNALS:
237 #if _POSIX_REALTIME_SIGNALS == 0
238 mib[0] = CTL_P1003_1B;
239 mib[1] = CTL_P1003_1B_REALTIME_SIGNALS;
242 return (_POSIX_REALTIME_SIGNALS);
245 #if _POSIX_SEMAPHORES == 0
246 mib[0] = CTL_P1003_1B;
247 mib[1] = CTL_P1003_1B_SEMAPHORES;
250 return (_POSIX_SEMAPHORES);
253 return (_POSIX_FSYNC);
255 case _SC_SHARED_MEMORY_OBJECTS:
256 return (_POSIX_SHARED_MEMORY_OBJECTS);
257 case _SC_SYNCHRONIZED_IO:
258 #if _POSIX_SYNCHRONIZED_IO == 0
259 mib[0] = CTL_P1003_1B;
260 mib[1] = CTL_P1003_1B_SYNCHRONIZED_IO;
263 return (_POSIX_SYNCHRONIZED_IO);
266 #if _POSIX_TIMERS == 0
267 mib[0] = CTL_P1003_1B;
268 mib[1] = CTL_P1003_1B_TIMERS;
271 return (_POSIX_TIMERS);
273 case _SC_AIO_LISTIO_MAX:
274 mib[0] = CTL_P1003_1B;
275 mib[1] = CTL_P1003_1B_AIO_LISTIO_MAX;
278 mib[0] = CTL_P1003_1B;
279 mib[1] = CTL_P1003_1B_AIO_MAX;
281 case _SC_AIO_PRIO_DELTA_MAX:
282 mib[0] = CTL_P1003_1B;
283 mib[1] = CTL_P1003_1B_AIO_PRIO_DELTA_MAX;
285 case _SC_DELAYTIMER_MAX:
286 mib[0] = CTL_P1003_1B;
287 mib[1] = CTL_P1003_1B_DELAYTIMER_MAX;
289 case _SC_MQ_OPEN_MAX:
290 mib[0] = CTL_P1003_1B;
291 mib[1] = CTL_P1003_1B_MQ_OPEN_MAX;
294 return (getpagesize());
296 mib[0] = CTL_P1003_1B;
297 mib[1] = CTL_P1003_1B_RTSIG_MAX;
299 case _SC_SEM_NSEMS_MAX:
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;
308 mib[0] = CTL_P1003_1B;
309 mib[1] = CTL_P1003_1B_TIMER_MAX;
312 if (sysctl(mib, 2, &value, &len, NULL, 0) == -1)
315 return (defaultresult);
316 return ((long)value);
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:
325 #error "don't know how to determine _SC_2_PBS"
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''.
336 return (_POSIX2_PBS);
338 case _SC_ADVISORY_INFO:
339 #if _POSIX_ADVISORY_INFO == 0
340 #error "_POSIX_ADVISORY_INFO"
342 return (_POSIX_ADVISORY_INFO);
345 #if _POSIX_BARRIERS == 0
346 #error "_POSIX_BARRIERS"
348 return (_POSIX_BARRIERS);
350 case _SC_CLOCK_SELECTION:
351 #if _POSIX_CLOCK_SELECTION == 0
352 #error "_POSIX_CLOCK_SELECTION"
354 return (_POSIX_CLOCK_SELECTION);
357 return (_POSIX_CPUTIME);
359 case _SC_FILE_LOCKING:
361 * XXX - The standard doesn't tell us how to define
362 * _POSIX_FILE_LOCKING, so we can't answer this one.
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.
373 case _SC_GETGR_R_SIZE_MAX:
374 case _SC_GETPW_R_SIZE_MAX:
376 case _SC_HOST_NAME_MAX:
377 return (MAXHOSTNAMELEN - 1); /* does not include \0 */
378 case _SC_LOGIN_NAME_MAX:
380 case _SC_MONOTONIC_CLOCK:
381 #if _POSIX_MONOTONIC_CLOCK == 0
382 #error "_POSIX_MONOTONIC_CLOCK"
384 return (_POSIX_MONOTONIC_CLOCK);
386 #if _POSIX_MESSAGE_PASSING > -1
387 case _SC_MQ_PRIO_MAX:
388 return (MQ_PRIO_MAX);
390 case _SC_READER_WRITER_LOCKS:
391 return (_POSIX_READER_WRITER_LOCKS);
393 return (_POSIX_REGEXP);
395 return (_POSIX_SHELL);
397 return (_POSIX_SPAWN);
399 return (_POSIX_SPIN_LOCKS);
400 case _SC_SPORADIC_SERVER:
401 #if _POSIX_SPORADIC_SERVER == 0
402 #error "_POSIX_SPORADIC_SERVER"
404 return (_POSIX_SPORADIC_SERVER);
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! */
431 return (_POSIX_TIMEOUTS);
433 return (_POSIX_THREADS);
435 #if _POSIX_TRACE == 0
436 #error "_POSIX_TRACE"
437 /* While you're implementing this, also do the ones below. */
439 return (_POSIX_TRACE);
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);
447 return (_POSIX_TRACE_LOG);
449 case _SC_TTY_NAME_MAX:
452 case _SC_TYPED_MEMORY_OBJECTS:
453 #if _POSIX_TYPED_MEMORY_OBJECTS == 0
454 #error "_POSIX_TYPED_MEMORY_OBJECTS"
456 return (_POSIX_TYPED_MEMORY_OBJECTS);
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))
468 return (_V6_ILP32_OFF32);
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)
480 return (_V6_ILP32_OFFBIG);
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))
492 return (_V6_LP64_OFF64);
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)
504 return (_V6_LPBIG_OFFBIG);
507 return (ATEXIT_SIZE);
510 mib[1] = KERN_IOV_MAX;
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
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;
537 return (_XOPEN_REALTIME);
539 case _SC_XOPEN_REALTIME_THREADS:
540 #if _XOPEN_REALTIME_THREADS == 0
541 #error "_XOPEN_REALTIME_THREADS"
543 return (_XOPEN_REALTIME_THREADS);
546 len = sizeof(lvalue);
548 if (sysctlbyname("kern.ipc.shmmin", &lvalue, &len, NULL,
555 case _SC_XOPEN_STREAMS:
556 return (_XOPEN_STREAMS);
558 return (_XOPEN_UNIX);
559 #ifdef _XOPEN_VERSION
560 case _SC_XOPEN_VERSION:
561 return (_XOPEN_VERSION);
563 #ifdef _XOPEN_XCU_VERSION
564 case _SC_XOPEN_XCU_VERSION:
565 return (_XOPEN_XCU_VERSION);
567 case _SC_SYMLOOP_MAX:
568 return (MAXSYMLINKS);
569 case _SC_RAW_SOCKETS:
570 return (_POSIX_RAW_SOCKETS);
574 value = _socket(PF_INET6, SOCK_DGRAM, 0);
582 return (_POSIX_IPV6);
585 case _SC_NPROCESSORS_CONF:
586 case _SC_NPROCESSORS_ONLN:
587 if (_elf_aux_info(AT_NCPUS, &value, sizeof(value)) == 0)
588 return ((long)value);
593 #ifdef _SC_PHYS_PAGES
595 len = sizeof(lvalue);
596 if (sysctlbyname("hw.availpages", &lvalue, &len, NULL, 0) == -1)
601 #ifdef _SC_CPUSET_SIZE
602 case _SC_CPUSET_SIZE:
604 if (sysctlbyname("kern.sched.cpusetsize", &value, &len, NULL,
607 return ((long)value);
615 if (sysctl(mib, 2, &value, &len, NULL, 0) == -1)
617 return ((long)value);