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 #if defined(LIBC_SCCS) && !defined(lint)
36 static char sccsid[] = "@(#)sysconf.c 8.2 (Berkeley) 3/20/94";
37 #endif /* LIBC_SCCS and not lint */
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD$");
41 #include "namespace.h"
42 #include <sys/param.h>
44 #include <sys/sysctl.h>
45 #include <sys/resource.h>
46 #include <sys/socket.h>
52 #include <pthread.h> /* we just need the limits */
53 #include <semaphore.h>
56 #include "un-namespace.h"
58 #include "../stdlib/atexit.h"
59 #include "tzfile.h" /* from ../../../contrib/tzcode/stdtime */
60 #include "libc_private.h"
62 #define _PATH_ZONEINFO TZDIR /* from tzfile.h */
66 * get configurable system variables.
69 * POSIX 1003.1 (ISO/IEC 9945-1, 4.8.1.3) states that the variable values
70 * not change during the lifetime of the calling process. This would seem
71 * to require that any change to system limits kill all running processes.
72 * A workaround might be to cache the values when they are first retrieved
73 * and then simply return the cached value on subsequent calls. This is
74 * less useful than returning up-to-date values, however.
81 int mib[2], sverrno, value;
82 long lvalue, defaultresult;
93 if (getrlimit(RLIMIT_NPROC, &rl) != 0)
95 if (rl.rlim_cur == RLIM_INFINITY)
97 if (rl.rlim_cur > LONG_MAX) {
101 return ((long)rl.rlim_cur);
104 case _SC_NGROUPS_MAX:
106 mib[1] = KERN_NGROUPS;
109 if (getrlimit(RLIMIT_NOFILE, &rl) != 0)
111 if (rl.rlim_cur == RLIM_INFINITY)
113 if (rl.rlim_cur > LONG_MAX) {
117 return ((long)rl.rlim_cur);
119 if (getrlimit(RLIMIT_NOFILE, &rl) != 0)
121 if (rl.rlim_cur == RLIM_INFINITY)
123 if (rl.rlim_cur > LONG_MAX) {
128 * struct __sFILE currently has a limitation that
129 * file descriptors must fit in a signed short.
130 * This doesn't precisely capture the letter of POSIX
131 * but approximates the spirit.
133 if (rl.rlim_cur > SHRT_MAX)
136 return ((long)rl.rlim_cur);
137 case _SC_JOB_CONTROL:
138 return (_POSIX_JOB_CONTROL);
140 /* XXX - must be 1 */
142 mib[1] = KERN_SAVED_IDS;
146 mib[1] = KERN_POSIX1;
148 case _SC_BC_BASE_MAX:
149 return (BC_BASE_MAX);
152 case _SC_BC_SCALE_MAX:
153 return (BC_SCALE_MAX);
154 case _SC_BC_STRING_MAX:
155 return (BC_STRING_MAX);
156 case _SC_COLL_WEIGHTS_MAX:
157 return (COLL_WEIGHTS_MAX);
158 case _SC_EXPR_NEST_MAX:
159 return (EXPR_NEST_MAX);
166 * This is something of a lie, but it would be silly at
167 * this point to try to deduce this from the contents
170 return (_POSIX2_VERSION);
172 return (_POSIX2_C_BIND);
174 return (_POSIX2_C_DEV);
175 case _SC_2_CHAR_TERM:
176 return (_POSIX2_CHAR_TERM);
178 return (_POSIX2_FORT_DEV);
180 return (_POSIX2_FORT_RUN);
181 case _SC_2_LOCALEDEF:
182 return (_POSIX2_LOCALEDEF);
184 return (_POSIX2_SW_DEV);
186 return (_POSIX2_UPE);
188 path = _PATH_ZONEINFO;
192 lvalue = pathconf(path, _PC_NAME_MAX);
193 if (lvalue == -1 && errno != 0)
198 case _SC_ASYNCHRONOUS_IO:
199 #if _POSIX_ASYNCHRONOUS_IO == 0
200 mib[0] = CTL_P1003_1B;
201 mib[1] = CTL_P1003_1B_ASYNCHRONOUS_IO;
204 return (_POSIX_ASYNCHRONOUS_IO);
206 case _SC_MAPPED_FILES:
207 return (_POSIX_MAPPED_FILES);
209 return (_POSIX_MEMLOCK);
210 case _SC_MEMLOCK_RANGE:
211 return (_POSIX_MEMLOCK_RANGE);
212 case _SC_MEMORY_PROTECTION:
213 return (_POSIX_MEMORY_PROTECTION);
214 case _SC_MESSAGE_PASSING:
215 #if _POSIX_MESSAGE_PASSING == 0
216 mib[0] = CTL_P1003_1B;
217 mib[1] = CTL_P1003_1B_MESSAGE_PASSING;
220 return (_POSIX_MESSAGE_PASSING);
222 case _SC_PRIORITIZED_IO:
223 #if _POSIX_PRIORITIZED_IO == 0
224 mib[0] = CTL_P1003_1B;
225 mib[1] = CTL_P1003_1B_PRIORITIZED_IO;
228 return (_POSIX_PRIORITIZED_IO);
230 case _SC_PRIORITY_SCHEDULING:
231 #if _POSIX_PRIORITY_SCHEDULING == 0
232 mib[0] = CTL_P1003_1B;
233 mib[1] = CTL_P1003_1B_PRIORITY_SCHEDULING;
236 return (_POSIX_PRIORITY_SCHEDULING);
238 case _SC_REALTIME_SIGNALS:
239 #if _POSIX_REALTIME_SIGNALS == 0
240 mib[0] = CTL_P1003_1B;
241 mib[1] = CTL_P1003_1B_REALTIME_SIGNALS;
244 return (_POSIX_REALTIME_SIGNALS);
247 #if _POSIX_SEMAPHORES == 0
248 mib[0] = CTL_P1003_1B;
249 mib[1] = CTL_P1003_1B_SEMAPHORES;
252 return (_POSIX_SEMAPHORES);
255 return (_POSIX_FSYNC);
257 case _SC_SHARED_MEMORY_OBJECTS:
258 return (_POSIX_SHARED_MEMORY_OBJECTS);
259 case _SC_SYNCHRONIZED_IO:
260 #if _POSIX_SYNCHRONIZED_IO == 0
261 mib[0] = CTL_P1003_1B;
262 mib[1] = CTL_P1003_1B_SYNCHRONIZED_IO;
265 return (_POSIX_SYNCHRONIZED_IO);
268 #if _POSIX_TIMERS == 0
269 mib[0] = CTL_P1003_1B;
270 mib[1] = CTL_P1003_1B_TIMERS;
273 return (_POSIX_TIMERS);
275 case _SC_AIO_LISTIO_MAX:
276 mib[0] = CTL_P1003_1B;
277 mib[1] = CTL_P1003_1B_AIO_LISTIO_MAX;
280 mib[0] = CTL_P1003_1B;
281 mib[1] = CTL_P1003_1B_AIO_MAX;
283 case _SC_AIO_PRIO_DELTA_MAX:
284 mib[0] = CTL_P1003_1B;
285 mib[1] = CTL_P1003_1B_AIO_PRIO_DELTA_MAX;
287 case _SC_DELAYTIMER_MAX:
288 mib[0] = CTL_P1003_1B;
289 mib[1] = CTL_P1003_1B_DELAYTIMER_MAX;
291 case _SC_MQ_OPEN_MAX:
292 mib[0] = CTL_P1003_1B;
293 mib[1] = CTL_P1003_1B_MQ_OPEN_MAX;
296 defaultresult = getpagesize();
297 mib[0] = CTL_P1003_1B;
298 mib[1] = CTL_P1003_1B_PAGESIZE;
301 mib[0] = CTL_P1003_1B;
302 mib[1] = CTL_P1003_1B_RTSIG_MAX;
304 case _SC_SEM_NSEMS_MAX:
306 case _SC_SEM_VALUE_MAX:
307 return (SEM_VALUE_MAX);
308 case _SC_SIGQUEUE_MAX:
309 mib[0] = CTL_P1003_1B;
310 mib[1] = CTL_P1003_1B_SIGQUEUE_MAX;
313 mib[0] = CTL_P1003_1B;
314 mib[1] = CTL_P1003_1B_TIMER_MAX;
317 if (sysctl(mib, 2, &value, &len, NULL, 0) == -1)
320 return (defaultresult);
321 return ((long)value);
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:
330 #error "don't know how to determine _SC_2_PBS"
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''.
341 return (_POSIX2_PBS);
343 case _SC_ADVISORY_INFO:
344 #if _POSIX_ADVISORY_INFO == 0
345 #error "_POSIX_ADVISORY_INFO"
347 return (_POSIX_ADVISORY_INFO);
350 #if _POSIX_BARRIERS == 0
351 #error "_POSIX_BARRIERS"
353 return (_POSIX_BARRIERS);
355 case _SC_CLOCK_SELECTION:
356 #if _POSIX_CLOCK_SELECTION == 0
357 #error "_POSIX_CLOCK_SELECTION"
359 return (_POSIX_CLOCK_SELECTION);
362 return (_POSIX_CPUTIME);
364 case _SC_FILE_LOCKING:
366 * XXX - The standard doesn't tell us how to define
367 * _POSIX_FILE_LOCKING, so we can't answer this one.
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.
378 case _SC_GETGR_R_SIZE_MAX:
379 case _SC_GETPW_R_SIZE_MAX:
381 case _SC_HOST_NAME_MAX:
382 return (MAXHOSTNAMELEN - 1); /* does not include \0 */
383 case _SC_LOGIN_NAME_MAX:
385 case _SC_MONOTONIC_CLOCK:
386 #if _POSIX_MONOTONIC_CLOCK == 0
387 #error "_POSIX_MONOTONIC_CLOCK"
389 return (_POSIX_MONOTONIC_CLOCK);
391 #if _POSIX_MESSAGE_PASSING > -1
392 case _SC_MQ_PRIO_MAX:
393 return (MQ_PRIO_MAX);
395 case _SC_READER_WRITER_LOCKS:
396 return (_POSIX_READER_WRITER_LOCKS);
398 return (_POSIX_REGEXP);
400 return (_POSIX_SHELL);
402 return (_POSIX_SPAWN);
404 return (_POSIX_SPIN_LOCKS);
405 case _SC_SPORADIC_SERVER:
406 #if _POSIX_SPORADIC_SERVER == 0
407 #error "_POSIX_SPORADIC_SERVER"
409 return (_POSIX_SPORADIC_SERVER);
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! */
436 return (_POSIX_TIMEOUTS);
438 return (_POSIX_THREADS);
440 #if _POSIX_TRACE == 0
441 #error "_POSIX_TRACE"
442 /* While you're implementing this, also do the ones below. */
444 return (_POSIX_TRACE);
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);
452 return (_POSIX_TRACE_LOG);
454 case _SC_TTY_NAME_MAX:
457 case _SC_TYPED_MEMORY_OBJECTS:
458 #if _POSIX_TYPED_MEMORY_OBJECTS == 0
459 #error "_POSIX_TYPED_MEMORY_OBJECTS"
461 return (_POSIX_TYPED_MEMORY_OBJECTS);
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))
473 return (_V6_ILP32_OFF32);
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)
485 return (_V6_ILP32_OFFBIG);
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))
497 return (_V6_LP64_OFF64);
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)
509 return (_V6_LPBIG_OFFBIG);
512 return (ATEXIT_SIZE);
515 mib[1] = KERN_IOV_MAX;
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
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;
542 return (_XOPEN_REALTIME);
544 case _SC_XOPEN_REALTIME_THREADS:
545 #if _XOPEN_REALTIME_THREADS == 0
546 #error "_XOPEN_REALTIME_THREADS"
548 return (_XOPEN_REALTIME_THREADS);
551 len = sizeof(lvalue);
553 if (sysctlbyname("kern.ipc.shmmin", &lvalue, &len, NULL,
560 case _SC_XOPEN_STREAMS:
561 return (_XOPEN_STREAMS);
563 return (_XOPEN_UNIX);
564 #ifdef _XOPEN_VERSION
565 case _SC_XOPEN_VERSION:
566 return (_XOPEN_VERSION);
568 #ifdef _XOPEN_XCU_VERSION
569 case _SC_XOPEN_XCU_VERSION:
570 return (_XOPEN_XCU_VERSION);
572 case _SC_SYMLOOP_MAX:
573 return (MAXSYMLINKS);
574 case _SC_RAW_SOCKETS:
575 return (_POSIX_RAW_SOCKETS);
579 value = _socket(PF_INET6, SOCK_DGRAM, 0);
587 return (_POSIX_IPV6);
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);
598 #ifdef _SC_PHYS_PAGES
600 len = sizeof(lvalue);
601 if (sysctlbyname("hw.availpages", &lvalue, &len, NULL, 0) == -1)
606 #ifdef _SC_CPUSET_SIZE
607 case _SC_CPUSET_SIZE:
609 if (sysctlbyname("kern.sched.cpusetsize", &value, &len, NULL,
612 return ((long)value);
620 if (sysctl(mib, 2, &value, &len, NULL, 0) == -1)
622 return ((long)value);