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 #include "namespace.h"
38 #include <sys/param.h>
40 #include <sys/sysctl.h>
41 #include <sys/resource.h>
42 #include <sys/socket.h>
48 #include <pthread.h> /* we just need the limits */
49 #include <semaphore.h>
52 #include "un-namespace.h"
54 #include "../stdlib/atexit.h"
55 #include "tzfile.h" /* from ../../../contrib/tzcode/stdtime */
56 #include "libc_private.h"
58 #define _PATH_ZONEINFO TZDIR /* from tzfile.h */
62 * get configurable system variables.
65 * POSIX 1003.1 (ISO/IEC 9945-1, 4.8.1.3) states that the variable values
66 * not change during the lifetime of the calling process. This would seem
67 * to require that any change to system limits kill all running processes.
68 * A workaround might be to cache the values when they are first retrieved
69 * and then simply return the cached value on subsequent calls. This is
70 * less useful than returning up-to-date values, however.
77 int mib[2], sverrno, value;
78 long lvalue, defaultresult;
89 if (getrlimit(RLIMIT_NPROC, &rl) != 0)
91 if (rl.rlim_cur == RLIM_INFINITY)
93 if (rl.rlim_cur > LONG_MAX) {
97 return ((long)rl.rlim_cur);
100 case _SC_NGROUPS_MAX:
102 mib[1] = KERN_NGROUPS;
105 if (getrlimit(RLIMIT_NOFILE, &rl) != 0)
107 if (rl.rlim_cur == RLIM_INFINITY)
109 if (rl.rlim_cur > LONG_MAX) {
113 return ((long)rl.rlim_cur);
115 if (getrlimit(RLIMIT_NOFILE, &rl) != 0)
117 if (rl.rlim_cur == RLIM_INFINITY)
119 if (rl.rlim_cur > LONG_MAX) {
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.
129 if (rl.rlim_cur > SHRT_MAX)
132 return ((long)rl.rlim_cur);
133 case _SC_JOB_CONTROL:
134 return (_POSIX_JOB_CONTROL);
136 /* XXX - must be 1 */
138 mib[1] = KERN_SAVED_IDS;
142 mib[1] = KERN_POSIX1;
144 case _SC_BC_BASE_MAX:
145 return (BC_BASE_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);
162 * This is something of a lie, but it would be silly at
163 * this point to try to deduce this from the contents
166 return (_POSIX2_VERSION);
168 return (_POSIX2_C_BIND);
170 return (_POSIX2_C_DEV);
171 case _SC_2_CHAR_TERM:
172 return (_POSIX2_CHAR_TERM);
174 return (_POSIX2_FORT_DEV);
176 return (_POSIX2_FORT_RUN);
177 case _SC_2_LOCALEDEF:
178 return (_POSIX2_LOCALEDEF);
180 return (_POSIX2_SW_DEV);
182 return (_POSIX2_UPE);
184 path = _PATH_ZONEINFO;
188 lvalue = pathconf(path, _PC_NAME_MAX);
189 if (lvalue == -1 && errno != 0)
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;
200 return (_POSIX_ASYNCHRONOUS_IO);
202 case _SC_MAPPED_FILES:
203 return (_POSIX_MAPPED_FILES);
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;
216 return (_POSIX_MESSAGE_PASSING);
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;
224 return (_POSIX_PRIORITIZED_IO);
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;
232 return (_POSIX_PRIORITY_SCHEDULING);
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;
240 return (_POSIX_REALTIME_SIGNALS);
243 #if _POSIX_SEMAPHORES == 0
244 mib[0] = CTL_P1003_1B;
245 mib[1] = CTL_P1003_1B_SEMAPHORES;
248 return (_POSIX_SEMAPHORES);
251 return (_POSIX_FSYNC);
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;
261 return (_POSIX_SYNCHRONIZED_IO);
264 #if _POSIX_TIMERS == 0
265 mib[0] = CTL_P1003_1B;
266 mib[1] = CTL_P1003_1B_TIMERS;
269 return (_POSIX_TIMERS);
271 case _SC_AIO_LISTIO_MAX:
272 mib[0] = CTL_P1003_1B;
273 mib[1] = CTL_P1003_1B_AIO_LISTIO_MAX;
276 mib[0] = CTL_P1003_1B;
277 mib[1] = CTL_P1003_1B_AIO_MAX;
279 case _SC_AIO_PRIO_DELTA_MAX:
280 mib[0] = CTL_P1003_1B;
281 mib[1] = CTL_P1003_1B_AIO_PRIO_DELTA_MAX;
283 case _SC_DELAYTIMER_MAX:
284 mib[0] = CTL_P1003_1B;
285 mib[1] = CTL_P1003_1B_DELAYTIMER_MAX;
287 case _SC_MQ_OPEN_MAX:
288 mib[0] = CTL_P1003_1B;
289 mib[1] = CTL_P1003_1B_MQ_OPEN_MAX;
292 return (getpagesize());
294 mib[0] = CTL_P1003_1B;
295 mib[1] = CTL_P1003_1B_RTSIG_MAX;
297 case _SC_SEM_NSEMS_MAX:
299 case _SC_SEM_VALUE_MAX:
300 return (SEM_VALUE_MAX);
301 case _SC_SIGQUEUE_MAX:
302 mib[0] = CTL_P1003_1B;
303 mib[1] = CTL_P1003_1B_SIGQUEUE_MAX;
306 mib[0] = CTL_P1003_1B;
307 mib[1] = CTL_P1003_1B_TIMER_MAX;
310 if (sysctl(mib, 2, &value, &len, NULL, 0) == -1)
313 return (defaultresult);
314 return ((long)value);
317 case _SC_2_PBS_ACCOUNTING:
318 case _SC_2_PBS_CHECKPOINT:
319 case _SC_2_PBS_LOCATE:
320 case _SC_2_PBS_MESSAGE:
321 case _SC_2_PBS_TRACK:
323 #error "don't know how to determine _SC_2_PBS"
325 * This probably requires digging through the filesystem
326 * to see if the appropriate package has been installed.
327 * Since we don't currently support this option at all,
328 * it's not worth the effort to write the code now.
329 * Figuring out which of the sub-options are supported
330 * would be even more difficult, so it's probably easier
331 * to always say ``no''.
334 return (_POSIX2_PBS);
336 case _SC_ADVISORY_INFO:
337 #if _POSIX_ADVISORY_INFO == 0
338 #error "_POSIX_ADVISORY_INFO"
340 return (_POSIX_ADVISORY_INFO);
343 #if _POSIX_BARRIERS == 0
344 #error "_POSIX_BARRIERS"
346 return (_POSIX_BARRIERS);
348 case _SC_CLOCK_SELECTION:
349 #if _POSIX_CLOCK_SELECTION == 0
350 #error "_POSIX_CLOCK_SELECTION"
352 return (_POSIX_CLOCK_SELECTION);
355 return (_POSIX_CPUTIME);
357 case _SC_FILE_LOCKING:
359 * XXX - The standard doesn't tell us how to define
360 * _POSIX_FILE_LOCKING, so we can't answer this one.
365 * SUSv4tc1 says the following about _SC_GETGR_R_SIZE_MAX and
366 * _SC_GETPW_R_SIZE_MAX:
367 * Note that sysconf(_SC_GETGR_R_SIZE_MAX) may return -1 if
368 * there is no hard limit on the size of the buffer needed to
369 * store all the groups returned.
371 case _SC_GETGR_R_SIZE_MAX:
372 case _SC_GETPW_R_SIZE_MAX:
374 case _SC_HOST_NAME_MAX:
375 return (MAXHOSTNAMELEN - 1); /* does not include \0 */
376 case _SC_LOGIN_NAME_MAX:
378 case _SC_MONOTONIC_CLOCK:
379 #if _POSIX_MONOTONIC_CLOCK == 0
380 #error "_POSIX_MONOTONIC_CLOCK"
382 return (_POSIX_MONOTONIC_CLOCK);
384 #if _POSIX_MESSAGE_PASSING > -1
385 case _SC_MQ_PRIO_MAX:
386 return (MQ_PRIO_MAX);
388 case _SC_READER_WRITER_LOCKS:
389 return (_POSIX_READER_WRITER_LOCKS);
391 return (_POSIX_REGEXP);
393 return (_POSIX_SHELL);
395 return (_POSIX_SPAWN);
397 return (_POSIX_SPIN_LOCKS);
398 case _SC_SPORADIC_SERVER:
399 #if _POSIX_SPORADIC_SERVER == 0
400 #error "_POSIX_SPORADIC_SERVER"
402 return (_POSIX_SPORADIC_SERVER);
404 case _SC_THREAD_ATTR_STACKADDR:
405 return (_POSIX_THREAD_ATTR_STACKADDR);
406 case _SC_THREAD_ATTR_STACKSIZE:
407 return (_POSIX_THREAD_ATTR_STACKSIZE);
408 case _SC_THREAD_CPUTIME:
409 return (_POSIX_THREAD_CPUTIME);
410 case _SC_THREAD_DESTRUCTOR_ITERATIONS:
411 return (PTHREAD_DESTRUCTOR_ITERATIONS);
412 case _SC_THREAD_KEYS_MAX:
413 return (PTHREAD_KEYS_MAX);
414 case _SC_THREAD_PRIO_INHERIT:
415 return (_POSIX_THREAD_PRIO_INHERIT);
416 case _SC_THREAD_PRIO_PROTECT:
417 return (_POSIX_THREAD_PRIO_PROTECT);
418 case _SC_THREAD_PRIORITY_SCHEDULING:
419 return (_POSIX_THREAD_PRIORITY_SCHEDULING);
420 case _SC_THREAD_PROCESS_SHARED:
421 return (_POSIX_THREAD_PROCESS_SHARED);
422 case _SC_THREAD_SAFE_FUNCTIONS:
423 return (_POSIX_THREAD_SAFE_FUNCTIONS);
424 case _SC_THREAD_STACK_MIN:
425 return (PTHREAD_STACK_MIN);
426 case _SC_THREAD_THREADS_MAX:
427 return (PTHREAD_THREADS_MAX); /* XXX wrong type! */
429 return (_POSIX_TIMEOUTS);
431 return (_POSIX_THREADS);
433 #if _POSIX_TRACE == 0
434 #error "_POSIX_TRACE"
435 /* While you're implementing this, also do the ones below. */
437 return (_POSIX_TRACE);
439 #if _POSIX_TRACE > -1
440 case _SC_TRACE_EVENT_FILTER:
441 return (_POSIX_TRACE_EVENT_FILTER);
442 case _SC_TRACE_INHERIT:
443 return (_POSIX_TRACE_INHERIT);
445 return (_POSIX_TRACE_LOG);
447 case _SC_TTY_NAME_MAX:
450 case _SC_TYPED_MEMORY_OBJECTS:
451 #if _POSIX_TYPED_MEMORY_OBJECTS == 0
452 #error "_POSIX_TYPED_MEMORY_OBJECTS"
454 return (_POSIX_TYPED_MEMORY_OBJECTS);
456 case _SC_V6_ILP32_OFF32:
457 #if _V6_ILP32_OFF32 == 0
458 if (sizeof(int) * CHAR_BIT == 32 &&
459 sizeof(int) == sizeof(long) &&
460 sizeof(long) == sizeof(void *) &&
461 sizeof(void *) == sizeof(off_t))
466 return (_V6_ILP32_OFF32);
468 case _SC_V6_ILP32_OFFBIG:
469 #if _V6_ILP32_OFFBIG == 0
470 if (sizeof(int) * CHAR_BIT == 32 &&
471 sizeof(int) == sizeof(long) &&
472 sizeof(long) == sizeof(void *) &&
473 sizeof(off_t) * CHAR_BIT >= 64)
478 return (_V6_ILP32_OFFBIG);
480 case _SC_V6_LP64_OFF64:
481 #if _V6_LP64_OFF64 == 0
482 if (sizeof(int) * CHAR_BIT == 32 &&
483 sizeof(long) * CHAR_BIT == 64 &&
484 sizeof(long) == sizeof(void *) &&
485 sizeof(void *) == sizeof(off_t))
490 return (_V6_LP64_OFF64);
492 case _SC_V6_LPBIG_OFFBIG:
493 #if _V6_LPBIG_OFFBIG == 0
494 if (sizeof(int) * CHAR_BIT >= 32 &&
495 sizeof(long) * CHAR_BIT >= 64 &&
496 sizeof(void *) * CHAR_BIT >= 64 &&
497 sizeof(off_t) * CHAR_BIT >= 64)
502 return (_V6_LPBIG_OFFBIG);
505 return (ATEXIT_SIZE);
508 mib[1] = KERN_IOV_MAX;
510 case _SC_XOPEN_CRYPT:
511 return (_XOPEN_CRYPT);
512 case _SC_XOPEN_ENH_I18N:
513 return (_XOPEN_ENH_I18N);
514 case _SC_XOPEN_LEGACY:
515 return (_XOPEN_LEGACY);
516 case _SC_XOPEN_REALTIME:
517 #if _XOPEN_REALTIME == 0
519 value = sysconf(_SC_ASYNCHRONOUS_IO) > 0 &&
520 sysconf(_SC_MEMLOCK) > 0 &&
521 sysconf(_SC_MEMLOCK_RANGE) > 0 &&
522 sysconf(_SC_MESSAGE_PASSING) > 0 &&
523 sysconf(_SC_PRIORITY_SCHEDULING) > 0 &&
524 sysconf(_SC_REALTIME_SIGNALS) > 0 &&
525 sysconf(_SC_SEMAPHORES) > 0 &&
526 sysconf(_SC_SHARED_MEMORY_OBJECTS) > 0 &&
527 sysconf(_SC_SYNCHRONIZED_IO) > 0 &&
528 sysconf(_SC_TIMERS) > 0;
535 return (_XOPEN_REALTIME);
537 case _SC_XOPEN_REALTIME_THREADS:
538 #if _XOPEN_REALTIME_THREADS == 0
539 #error "_XOPEN_REALTIME_THREADS"
541 return (_XOPEN_REALTIME_THREADS);
544 len = sizeof(lvalue);
546 if (sysctlbyname("kern.ipc.shmmin", &lvalue, &len, NULL,
553 case _SC_XOPEN_STREAMS:
554 return (_XOPEN_STREAMS);
556 return (_XOPEN_UNIX);
557 #ifdef _XOPEN_VERSION
558 case _SC_XOPEN_VERSION:
559 return (_XOPEN_VERSION);
561 #ifdef _XOPEN_XCU_VERSION
562 case _SC_XOPEN_XCU_VERSION:
563 return (_XOPEN_XCU_VERSION);
565 case _SC_SYMLOOP_MAX:
566 return (MAXSYMLINKS);
567 case _SC_RAW_SOCKETS:
568 return (_POSIX_RAW_SOCKETS);
572 value = _socket(PF_INET6, SOCK_DGRAM, 0);
580 return (_POSIX_IPV6);
583 case _SC_NPROCESSORS_CONF:
584 case _SC_NPROCESSORS_ONLN:
585 if (_elf_aux_info(AT_NCPUS, &value, sizeof(value)) == 0)
586 return ((long)value);
591 #ifdef _SC_PHYS_PAGES
593 len = sizeof(lvalue);
594 if (sysctlbyname("hw.availpages", &lvalue, &len, NULL, 0) == -1)
599 #ifdef _SC_CPUSET_SIZE
600 case _SC_CPUSET_SIZE:
602 if (sysctlbyname("kern.sched.cpusetsize", &value, &len, NULL,
605 return ((long)value);
613 if (sysctl(mib, 2, &value, &len, NULL, 0) == -1)
615 return ((long)value);