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 * 3. 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 "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 defaultresult = getpagesize();
295 mib[0] = CTL_P1003_1B;
296 mib[1] = CTL_P1003_1B_PAGESIZE;
299 mib[0] = CTL_P1003_1B;
300 mib[1] = CTL_P1003_1B_RTSIG_MAX;
302 case _SC_SEM_NSEMS_MAX:
304 case _SC_SEM_VALUE_MAX:
305 return (SEM_VALUE_MAX);
306 case _SC_SIGQUEUE_MAX:
307 mib[0] = CTL_P1003_1B;
308 mib[1] = CTL_P1003_1B_SIGQUEUE_MAX;
311 mib[0] = CTL_P1003_1B;
312 mib[1] = CTL_P1003_1B_TIMER_MAX;
315 if (sysctl(mib, 2, &value, &len, NULL, 0) == -1)
318 return (defaultresult);
319 return ((long)value);
322 case _SC_2_PBS_ACCOUNTING:
323 case _SC_2_PBS_CHECKPOINT:
324 case _SC_2_PBS_LOCATE:
325 case _SC_2_PBS_MESSAGE:
326 case _SC_2_PBS_TRACK:
328 #error "don't know how to determine _SC_2_PBS"
330 * This probably requires digging through the filesystem
331 * to see if the appropriate package has been installed.
332 * Since we don't currently support this option at all,
333 * it's not worth the effort to write the code now.
334 * Figuring out which of the sub-options are supported
335 * would be even more difficult, so it's probably easier
336 * to always say ``no''.
339 return (_POSIX2_PBS);
341 case _SC_ADVISORY_INFO:
342 #if _POSIX_ADVISORY_INFO == 0
343 #error "_POSIX_ADVISORY_INFO"
345 return (_POSIX_ADVISORY_INFO);
348 #if _POSIX_BARRIERS == 0
349 #error "_POSIX_BARRIERS"
351 return (_POSIX_BARRIERS);
353 case _SC_CLOCK_SELECTION:
354 #if _POSIX_CLOCK_SELECTION == 0
355 #error "_POSIX_CLOCK_SELECTION"
357 return (_POSIX_CLOCK_SELECTION);
360 return (_POSIX_CPUTIME);
362 case _SC_FILE_LOCKING:
364 * XXX - The standard doesn't tell us how to define
365 * _POSIX_FILE_LOCKING, so we can't answer this one.
370 * SUSv4tc1 says the following about _SC_GETGR_R_SIZE_MAX and
371 * _SC_GETPW_R_SIZE_MAX:
372 * Note that sysconf(_SC_GETGR_R_SIZE_MAX) may return -1 if
373 * there is no hard limit on the size of the buffer needed to
374 * store all the groups returned.
376 case _SC_GETGR_R_SIZE_MAX:
377 case _SC_GETPW_R_SIZE_MAX:
379 case _SC_HOST_NAME_MAX:
380 return (MAXHOSTNAMELEN - 1); /* does not include \0 */
381 case _SC_LOGIN_NAME_MAX:
383 case _SC_MONOTONIC_CLOCK:
384 #if _POSIX_MONOTONIC_CLOCK == 0
385 #error "_POSIX_MONOTONIC_CLOCK"
387 return (_POSIX_MONOTONIC_CLOCK);
389 #if _POSIX_MESSAGE_PASSING > -1
390 case _SC_MQ_PRIO_MAX:
391 return (MQ_PRIO_MAX);
393 case _SC_READER_WRITER_LOCKS:
394 return (_POSIX_READER_WRITER_LOCKS);
396 return (_POSIX_REGEXP);
398 return (_POSIX_SHELL);
400 return (_POSIX_SPAWN);
402 return (_POSIX_SPIN_LOCKS);
403 case _SC_SPORADIC_SERVER:
404 #if _POSIX_SPORADIC_SERVER == 0
405 #error "_POSIX_SPORADIC_SERVER"
407 return (_POSIX_SPORADIC_SERVER);
409 case _SC_THREAD_ATTR_STACKADDR:
410 return (_POSIX_THREAD_ATTR_STACKADDR);
411 case _SC_THREAD_ATTR_STACKSIZE:
412 return (_POSIX_THREAD_ATTR_STACKSIZE);
413 case _SC_THREAD_CPUTIME:
414 return (_POSIX_THREAD_CPUTIME);
415 case _SC_THREAD_DESTRUCTOR_ITERATIONS:
416 return (PTHREAD_DESTRUCTOR_ITERATIONS);
417 case _SC_THREAD_KEYS_MAX:
418 return (PTHREAD_KEYS_MAX);
419 case _SC_THREAD_PRIO_INHERIT:
420 return (_POSIX_THREAD_PRIO_INHERIT);
421 case _SC_THREAD_PRIO_PROTECT:
422 return (_POSIX_THREAD_PRIO_PROTECT);
423 case _SC_THREAD_PRIORITY_SCHEDULING:
424 return (_POSIX_THREAD_PRIORITY_SCHEDULING);
425 case _SC_THREAD_PROCESS_SHARED:
426 return (_POSIX_THREAD_PROCESS_SHARED);
427 case _SC_THREAD_SAFE_FUNCTIONS:
428 return (_POSIX_THREAD_SAFE_FUNCTIONS);
429 case _SC_THREAD_STACK_MIN:
430 return (PTHREAD_STACK_MIN);
431 case _SC_THREAD_THREADS_MAX:
432 return (PTHREAD_THREADS_MAX); /* XXX wrong type! */
434 return (_POSIX_TIMEOUTS);
436 return (_POSIX_THREADS);
438 #if _POSIX_TRACE == 0
439 #error "_POSIX_TRACE"
440 /* While you're implementing this, also do the ones below. */
442 return (_POSIX_TRACE);
444 #if _POSIX_TRACE > -1
445 case _SC_TRACE_EVENT_FILTER:
446 return (_POSIX_TRACE_EVENT_FILTER);
447 case _SC_TRACE_INHERIT:
448 return (_POSIX_TRACE_INHERIT);
450 return (_POSIX_TRACE_LOG);
452 case _SC_TTY_NAME_MAX:
455 case _SC_TYPED_MEMORY_OBJECTS:
456 #if _POSIX_TYPED_MEMORY_OBJECTS == 0
457 #error "_POSIX_TYPED_MEMORY_OBJECTS"
459 return (_POSIX_TYPED_MEMORY_OBJECTS);
461 case _SC_V6_ILP32_OFF32:
462 #if _V6_ILP32_OFF32 == 0
463 if (sizeof(int) * CHAR_BIT == 32 &&
464 sizeof(int) == sizeof(long) &&
465 sizeof(long) == sizeof(void *) &&
466 sizeof(void *) == sizeof(off_t))
471 return (_V6_ILP32_OFF32);
473 case _SC_V6_ILP32_OFFBIG:
474 #if _V6_ILP32_OFFBIG == 0
475 if (sizeof(int) * CHAR_BIT == 32 &&
476 sizeof(int) == sizeof(long) &&
477 sizeof(long) == sizeof(void *) &&
478 sizeof(off_t) * CHAR_BIT >= 64)
483 return (_V6_ILP32_OFFBIG);
485 case _SC_V6_LP64_OFF64:
486 #if _V6_LP64_OFF64 == 0
487 if (sizeof(int) * CHAR_BIT == 32 &&
488 sizeof(long) * CHAR_BIT == 64 &&
489 sizeof(long) == sizeof(void *) &&
490 sizeof(void *) == sizeof(off_t))
495 return (_V6_LP64_OFF64);
497 case _SC_V6_LPBIG_OFFBIG:
498 #if _V6_LPBIG_OFFBIG == 0
499 if (sizeof(int) * CHAR_BIT >= 32 &&
500 sizeof(long) * CHAR_BIT >= 64 &&
501 sizeof(void *) * CHAR_BIT >= 64 &&
502 sizeof(off_t) * CHAR_BIT >= 64)
507 return (_V6_LPBIG_OFFBIG);
510 return (ATEXIT_SIZE);
513 mib[1] = KERN_IOV_MAX;
515 case _SC_XOPEN_CRYPT:
516 return (_XOPEN_CRYPT);
517 case _SC_XOPEN_ENH_I18N:
518 return (_XOPEN_ENH_I18N);
519 case _SC_XOPEN_LEGACY:
520 return (_XOPEN_LEGACY);
521 case _SC_XOPEN_REALTIME:
522 #if _XOPEN_REALTIME == 0
524 value = sysconf(_SC_ASYNCHRONOUS_IO) > 0 &&
525 sysconf(_SC_MEMLOCK) > 0 &&
526 sysconf(_SC_MEMLOCK_RANGE) > 0 &&
527 sysconf(_SC_MESSAGE_PASSING) > 0 &&
528 sysconf(_SC_PRIORITY_SCHEDULING) > 0 &&
529 sysconf(_SC_REALTIME_SIGNALS) > 0 &&
530 sysconf(_SC_SEMAPHORES) > 0 &&
531 sysconf(_SC_SHARED_MEMORY_OBJECTS) > 0 &&
532 sysconf(_SC_SYNCHRONIZED_IO) > 0 &&
533 sysconf(_SC_TIMERS) > 0;
540 return (_XOPEN_REALTIME);
542 case _SC_XOPEN_REALTIME_THREADS:
543 #if _XOPEN_REALTIME_THREADS == 0
544 #error "_XOPEN_REALTIME_THREADS"
546 return (_XOPEN_REALTIME_THREADS);
549 len = sizeof(lvalue);
551 if (sysctlbyname("kern.ipc.shmmin", &lvalue, &len, NULL,
558 case _SC_XOPEN_STREAMS:
559 return (_XOPEN_STREAMS);
561 return (_XOPEN_UNIX);
562 #ifdef _XOPEN_VERSION
563 case _SC_XOPEN_VERSION:
564 return (_XOPEN_VERSION);
566 #ifdef _XOPEN_XCU_VERSION
567 case _SC_XOPEN_XCU_VERSION:
568 return (_XOPEN_XCU_VERSION);
570 case _SC_SYMLOOP_MAX:
571 return (MAXSYMLINKS);
572 case _SC_RAW_SOCKETS:
573 return (_POSIX_RAW_SOCKETS);
577 value = _socket(PF_INET6, SOCK_DGRAM, 0);
585 return (_POSIX_IPV6);
588 case _SC_NPROCESSORS_CONF:
589 case _SC_NPROCESSORS_ONLN:
590 if (_elf_aux_info(AT_NCPUS, &value, sizeof(value)) == 0)
591 return ((long)value);
596 #ifdef _SC_PHYS_PAGES
598 len = sizeof(lvalue);
599 if (sysctlbyname("hw.availpages", &lvalue, &len, NULL, 0) == -1)
604 #ifdef _SC_CPUSET_SIZE
605 case _SC_CPUSET_SIZE:
607 if (sysctlbyname("kern.sched.cpusetsize", &value, &len, NULL,
610 return ((long)value);
618 if (sysctl(mib, 2, &value, &len, NULL, 0) == -1)
620 return ((long)value);