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>
48 #include <pthread.h> /* we just need the limits */
52 #include "../stdlib/atexit.h"
53 #include "../stdtime/tzfile.h"
55 #define _PATH_ZONEINFO TZDIR /* from tzfile.h */
59 * get configurable system variables.
62 * POSIX 1003.1 (ISO/IEC 9945-1, 4.8.1.3) states that the variable values
63 * not change during the lifetime of the calling process. This would seem
64 * to require that any change to system limits kill all running processes.
65 * A workaround might be to cache the values when they are first retrieved
66 * and then simply return the cached value on subsequent calls. This is
67 * less useful than returning up-to-date values, however.
75 int mib[2], sverrno, value;
76 long lvalue, defaultresult;
87 if (getrlimit(RLIMIT_NPROC, &rl) != 0)
89 if (rl.rlim_cur == RLIM_INFINITY)
91 if (rl.rlim_cur > LONG_MAX) {
95 return ((long)rl.rlim_cur);
100 mib[1] = KERN_NGROUPS;
103 if (getrlimit(RLIMIT_NOFILE, &rl) != 0)
105 if (rl.rlim_cur == RLIM_INFINITY)
107 if (rl.rlim_cur > LONG_MAX) {
111 return ((long)rl.rlim_cur);
113 if (getrlimit(RLIMIT_NOFILE, &rl) != 0)
115 if (rl.rlim_cur == RLIM_INFINITY)
117 if (rl.rlim_cur > LONG_MAX) {
122 * struct __sFILE currently has a limitation that
123 * file descriptors must fit in a signed short.
124 * This doesn't precisely capture the letter of POSIX
125 * but approximates the spirit.
127 if (rl.rlim_cur > SHRT_MAX)
130 return ((long)rl.rlim_cur);
131 case _SC_JOB_CONTROL:
132 return (_POSIX_JOB_CONTROL);
134 /* XXX - must be 1 */
136 mib[1] = KERN_SAVED_IDS;
140 mib[1] = KERN_POSIX1;
142 case _SC_BC_BASE_MAX:
143 return (BC_BASE_MAX);
146 case _SC_BC_SCALE_MAX:
147 return (BC_SCALE_MAX);
148 case _SC_BC_STRING_MAX:
149 return (BC_STRING_MAX);
150 case _SC_COLL_WEIGHTS_MAX:
151 return (COLL_WEIGHTS_MAX);
152 case _SC_EXPR_NEST_MAX:
153 return (EXPR_NEST_MAX);
160 * This is something of a lie, but it would be silly at
161 * this point to try to deduce this from the contents
164 return (_POSIX2_VERSION);
166 return (_POSIX2_C_BIND);
168 return (_POSIX2_C_DEV);
169 case _SC_2_CHAR_TERM:
170 return (_POSIX2_CHAR_TERM);
172 return (_POSIX2_FORT_DEV);
174 return (_POSIX2_FORT_RUN);
175 case _SC_2_LOCALEDEF:
176 return (_POSIX2_LOCALEDEF);
178 return (_POSIX2_SW_DEV);
180 return (_POSIX2_UPE);
182 path = _PATH_ZONEINFO;
186 lvalue = pathconf(path, _PC_NAME_MAX);
187 if (lvalue == -1 && errno != 0)
192 case _SC_ASYNCHRONOUS_IO:
193 #if _POSIX_ASYNCHRONOUS_IO == 0
194 mib[0] = CTL_P1003_1B;
195 mib[1] = CTL_P1003_1B_ASYNCHRONOUS_IO;
198 return (_POSIX_ASYNCHRONOUS_IO);
200 case _SC_MAPPED_FILES:
201 return (_POSIX_MAPPED_FILES);
203 return (_POSIX_MEMLOCK);
204 case _SC_MEMLOCK_RANGE:
205 return (_POSIX_MEMLOCK_RANGE);
206 case _SC_MEMORY_PROTECTION:
207 return (_POSIX_MEMORY_PROTECTION);
208 case _SC_MESSAGE_PASSING:
209 #if _POSIX_MESSAGE_PASSING == 0
210 mib[0] = CTL_P1003_1B;
211 mib[1] = CTL_P1003_1B_MESSAGE_PASSING;
214 return (_POSIX_MESSAGE_PASSING);
216 case _SC_PRIORITIZED_IO:
217 #if _POSIX_PRIORITIZED_IO == 0
218 mib[0] = CTL_P1003_1B;
219 mib[1] = CTL_P1003_1B_PRIORITIZED_IO;
222 return (_POSIX_PRIORITIZED_IO);
224 case _SC_PRIORITY_SCHEDULING:
225 #if _POSIX_PRIORITY_SCHEDULING == 0
226 mib[0] = CTL_P1003_1B;
227 mib[1] = CTL_P1003_1B_PRIORITY_SCHEDULING;
230 return (_POSIX_PRIORITY_SCHEDULING);
232 case _SC_REALTIME_SIGNALS:
233 #if _POSIX_REALTIME_SIGNALS == 0
234 mib[0] = CTL_P1003_1B;
235 mib[1] = CTL_P1003_1B_REALTIME_SIGNALS;
238 return (_POSIX_REALTIME_SIGNALS);
241 #if _POSIX_SEMAPHORES == 0
242 mib[0] = CTL_P1003_1B;
243 mib[1] = CTL_P1003_1B_SEMAPHORES;
246 return (_POSIX_SEMAPHORES);
249 return (_POSIX_FSYNC);
251 case _SC_SHARED_MEMORY_OBJECTS:
252 return (_POSIX_SHARED_MEMORY_OBJECTS);
253 case _SC_SYNCHRONIZED_IO:
254 #if _POSIX_SYNCHRONIZED_IO == 0
255 mib[0] = CTL_P1003_1B;
256 mib[1] = CTL_P1003_1B_SYNCHRONIZED_IO;
259 return (_POSIX_SYNCHRONIZED_IO);
262 #if _POSIX_TIMERS == 0
263 mib[0] = CTL_P1003_1B;
264 mib[1] = CTL_P1003_1B_TIMERS;
267 return (_POSIX_TIMERS);
269 case _SC_AIO_LISTIO_MAX:
270 mib[0] = CTL_P1003_1B;
271 mib[1] = CTL_P1003_1B_AIO_LISTIO_MAX;
274 mib[0] = CTL_P1003_1B;
275 mib[1] = CTL_P1003_1B_AIO_MAX;
277 case _SC_AIO_PRIO_DELTA_MAX:
278 mib[0] = CTL_P1003_1B;
279 mib[1] = CTL_P1003_1B_AIO_PRIO_DELTA_MAX;
281 case _SC_DELAYTIMER_MAX:
282 mib[0] = CTL_P1003_1B;
283 mib[1] = CTL_P1003_1B_DELAYTIMER_MAX;
285 case _SC_MQ_OPEN_MAX:
286 mib[0] = CTL_P1003_1B;
287 mib[1] = CTL_P1003_1B_MQ_OPEN_MAX;
290 defaultresult = getpagesize();
291 mib[0] = CTL_P1003_1B;
292 mib[1] = CTL_P1003_1B_PAGESIZE;
295 mib[0] = CTL_P1003_1B;
296 mib[1] = CTL_P1003_1B_RTSIG_MAX;
298 case _SC_SEM_NSEMS_MAX:
299 mib[0] = CTL_P1003_1B;
300 mib[1] = CTL_P1003_1B_SEM_NSEMS_MAX;
302 case _SC_SEM_VALUE_MAX:
303 mib[0] = CTL_P1003_1B;
304 mib[1] = CTL_P1003_1B_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 #if _POSIX_CPUTIME == 0
361 #error "_POSIX_CPUTIME"
363 return (_POSIX_CPUTIME);
366 case _SC_FILE_LOCKING:
368 * XXX - The standard doesn't tell us how to define
369 * _POSIX_FILE_LOCKING, so we can't answer this one.
372 #if _POSIX_THREAD_SAFE_FUNCTIONS > -1
373 case _SC_GETGR_R_SIZE_MAX:
374 case _SC_GETPW_R_SIZE_MAX:
375 #error "somebody needs to implement this"
377 case _SC_HOST_NAME_MAX:
378 return (MAXHOSTNAMELEN - 1); /* does not include \0 */
379 case _SC_LOGIN_NAME_MAX:
381 case _SC_MONOTONIC_CLOCK:
382 #if _POSIX_MONOTONIC_CLOCK == 0
383 #error "_POSIX_MONOTONIC_CLOCK"
385 return (_POSIX_MONOTONIC_CLOCK);
387 #if _POSIX_MESSAGE_PASSING > -1
388 case _SC_MQ_PRIO_MAX:
389 return (MQ_PRIO_MAX);
391 case _SC_READER_WRITER_LOCKS:
392 return (_POSIX_READER_WRITER_LOCKS);
394 return (_POSIX_REGEXP);
396 return (_POSIX_SHELL);
398 return (_POSIX_SPAWN);
400 return (_POSIX_SPIN_LOCKS);
401 case _SC_SPORADIC_SERVER:
402 #if _POSIX_SPORADIC_SERVER == 0
403 #error "_POSIX_SPORADIC_SERVER"
405 return (_POSIX_SPORADIC_SERVER);
407 case _SC_THREAD_ATTR_STACKADDR:
408 return (_POSIX_THREAD_ATTR_STACKADDR);
409 case _SC_THREAD_ATTR_STACKSIZE:
410 return (_POSIX_THREAD_ATTR_STACKSIZE);
411 case _SC_THREAD_CPUTIME:
412 return (_POSIX_THREAD_CPUTIME);
413 case _SC_THREAD_DESTRUCTOR_ITERATIONS:
414 return (PTHREAD_DESTRUCTOR_ITERATIONS);
415 case _SC_THREAD_KEYS_MAX:
416 return (PTHREAD_KEYS_MAX);
417 case _SC_THREAD_PRIO_INHERIT:
418 return (_POSIX_THREAD_PRIO_INHERIT);
419 case _SC_THREAD_PRIO_PROTECT:
420 return (_POSIX_THREAD_PRIO_PROTECT);
421 case _SC_THREAD_PRIORITY_SCHEDULING:
422 return (_POSIX_THREAD_PRIORITY_SCHEDULING);
423 case _SC_THREAD_PROCESS_SHARED:
424 return (_POSIX_THREAD_PROCESS_SHARED);
425 case _SC_THREAD_SAFE_FUNCTIONS:
426 return (_POSIX_THREAD_SAFE_FUNCTIONS);
427 case _SC_THREAD_STACK_MIN:
428 return (PTHREAD_STACK_MIN);
429 case _SC_THREAD_THREADS_MAX:
430 return (PTHREAD_THREADS_MAX); /* XXX wrong type! */
432 return (_POSIX_TIMEOUTS);
434 return (_POSIX_THREADS);
436 #if _POSIX_TRACE == 0
437 #error "_POSIX_TRACE"
438 /* While you're implementing this, also do the ones below. */
440 return (_POSIX_TRACE);
442 #if _POSIX_TRACE > -1
443 case _SC_TRACE_EVENT_FILTER:
444 return (_POSIX_TRACE_EVENT_FILTER);
445 case _SC_TRACE_INHERIT:
446 return (_POSIX_TRACE_INHERIT);
448 return (_POSIX_TRACE_LOG);
450 case _SC_TTY_NAME_MAX:
453 case _SC_TYPED_MEMORY_OBJECTS:
454 #if _POSIX_TYPED_MEMORY_OBJECTS == 0
455 #error "_POSIX_TYPED_MEMORY_OBJECTS"
457 return (_POSIX_TYPED_MEMORY_OBJECTS);
459 case _SC_V6_ILP32_OFF32:
460 #if _V6_ILP32_OFF32 == 0
461 if (sizeof(int) * CHAR_BIT == 32 &&
462 sizeof(int) == sizeof(long) &&
463 sizeof(long) == sizeof(void *) &&
464 sizeof(void *) == sizeof(off_t))
469 return (_V6_ILP32_OFF32);
471 case _SC_V6_ILP32_OFFBIG:
472 #if _V6_ILP32_OFFBIG == 0
473 if (sizeof(int) * CHAR_BIT == 32 &&
474 sizeof(int) == sizeof(long) &&
475 sizeof(long) == sizeof(void *) &&
476 sizeof(off_t) * CHAR_BIT >= 64)
481 return (_V6_ILP32_OFFBIG);
483 case _SC_V6_LP64_OFF64:
484 #if _V6_LP64_OFF64 == 0
485 if (sizeof(int) * CHAR_BIT == 32 &&
486 sizeof(long) * CHAR_BIT == 64 &&
487 sizeof(long) == sizeof(void *) &&
488 sizeof(void *) == sizeof(off_t))
493 return (_V6_LP64_OFF64);
495 case _SC_V6_LPBIG_OFFBIG:
496 #if _V6_LPBIG_OFFBIG == 0
497 if (sizeof(int) * CHAR_BIT >= 32 &&
498 sizeof(long) * CHAR_BIT >= 64 &&
499 sizeof(void *) * CHAR_BIT >= 64 &&
500 sizeof(off_t) * CHAR_BIT >= 64)
505 return (_V6_LPBIG_OFFBIG);
508 return (ATEXIT_SIZE);
511 mib[1] = KERN_IOV_MAX;
513 case _SC_XOPEN_CRYPT:
514 return (_XOPEN_CRYPT);
515 case _SC_XOPEN_ENH_I18N:
516 return (_XOPEN_ENH_I18N);
517 case _SC_XOPEN_LEGACY:
518 return (_XOPEN_LEGACY);
519 case _SC_XOPEN_REALTIME:
520 #if _XOPEN_REALTIME == 0
522 value = sysconf(_SC_ASYNCHRONOUS_IO) > 0 &&
523 sysconf(_SC_MEMLOCK) > 0 &&
524 sysconf(_SC_MEMLOCK_RANGE) > 0 &&
525 sysconf(_SC_MESSAGE_PASSING) > 0 &&
526 sysconf(_SC_PRIORITY_SCHEDULING) > 0 &&
527 sysconf(_SC_REALTIME_SIGNALS) > 0 &&
528 sysconf(_SC_SEMAPHORES) > 0 &&
529 sysconf(_SC_SHARED_MEMORY_OBJECTS) > 0 &&
530 sysconf(_SC_SYNCHRONIZED_IO) > 0 &&
531 sysconf(_SC_TIMERS) > 0;
538 return (_XOPEN_REALTIME);
540 case _SC_XOPEN_REALTIME_THREADS:
541 #if _XOPEN_REALTIME_THREADS == 0
542 #error "_XOPEN_REALTIME_THREADS"
544 return (_XOPEN_REALTIME_THREADS);
547 len = sizeof(lvalue);
549 if (sysctlbyname("kern.ipc.shmmin", &lvalue, &len, NULL,
556 case _SC_XOPEN_STREAMS:
557 return (_XOPEN_STREAMS);
559 return (_XOPEN_UNIX);
560 #ifdef _XOPEN_VERSION
561 case _SC_XOPEN_VERSION:
562 return (_XOPEN_VERSION);
564 #ifdef _XOPEN_XCU_VERSION
565 case _SC_XOPEN_XCU_VERSION:
566 return (_XOPEN_XCU_VERSION);
568 case _SC_SYMLOOP_MAX:
569 return (MAXSYMLINKS);
570 case _SC_RAW_SOCKETS:
571 return (_POSIX_RAW_SOCKETS);
575 value = socket(PF_INET6, SOCK_DGRAM, 0);
583 return (_POSIX_IPV6);
586 case _SC_NPROCESSORS_CONF:
587 case _SC_NPROCESSORS_ONLN:
592 #ifdef _SC_PHYS_PAGES
594 len = sizeof(lvalue);
595 if (sysctlbyname("hw.availpages", &lvalue, &len, NULL, 0) == -1)
605 if (sysctl(mib, 2, &value, &len, NULL, 0) == -1)
607 return ((long)value);