3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
6 * Sean Eric Fagan of Cygnus Support.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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.
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
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("$FreeBSD$");
39 #include <sys/param.h>
41 #include <sys/sysctl.h>
42 #include <sys/resource.h>
43 #include <sys/socket.h>
49 #include <pthread.h> /* we just need the limits */
53 #include "../stdlib/atexit.h"
54 #include "tzfile.h" /* from ../../../contrib/tzcode/stdtime */
55 #include "libc_private.h"
57 #define _PATH_ZONEINFO TZDIR /* from tzfile.h */
61 * get configurable system variables.
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.
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 defaultresult = getpagesize();
293 mib[0] = CTL_P1003_1B;
294 mib[1] = CTL_P1003_1B_PAGESIZE;
297 mib[0] = CTL_P1003_1B;
298 mib[1] = CTL_P1003_1B_RTSIG_MAX;
300 case _SC_SEM_NSEMS_MAX:
301 mib[0] = CTL_P1003_1B;
302 mib[1] = CTL_P1003_1B_SEM_NSEMS_MAX;
304 case _SC_SEM_VALUE_MAX:
305 mib[0] = CTL_P1003_1B;
306 mib[1] = CTL_P1003_1B_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);