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
32 * @(#)sysconf.c 8.2 (Berkeley) 3/20/94
33 * $FreeBSD: src/lib/libc/gen/sysconf.c,v 1.26 2008/02/27 05:56:57 wollman Exp $
34 * $DragonFly: src/lib/libc/gen/sysconf.c,v 1.5 2008/02/21 12:47:54 hasso Exp $
37 #include <sys/param.h>
39 #include <sys/sysctl.h>
40 #include <sys/resource.h>
41 #include <sys/socket.h>
46 #include <pthread.h> /* we just need the limits */
50 #include "../stdlib/atexit.h"
51 #include "../stdtime/tzfile.h"
53 #define _PATH_ZONEINFO TZDIR /* from tzfile.h */
57 * get configurable system variables.
60 * POSIX 1003.1 (ISO/IEC 9945-1, 4.8.1.3) states that the variable values
61 * not change during the lifetime of the calling process. This would seem
62 * to require that any change to system limits kill all running processes.
63 * A workaround might be to cache the values when they are first retrieved
64 * and then simply return the cached value on subsequent calls. This is
65 * less useful than returning up-to-date values, however.
72 int mib[2], sverrno, value;
73 long lvalue, defaultresult;
84 if (getrlimit(RLIMIT_NPROC, &rl) != 0)
86 if (rl.rlim_cur == RLIM_INFINITY)
88 if (rl.rlim_cur > LONG_MAX) {
92 return ((long)rl.rlim_cur);
97 mib[1] = KERN_NGROUPS;
100 if (getrlimit(RLIMIT_NOFILE, &rl) != 0)
102 if (rl.rlim_cur == RLIM_INFINITY)
104 if (rl.rlim_cur > LONG_MAX) {
108 return ((long)rl.rlim_cur);
110 if (getrlimit(RLIMIT_NOFILE, &rl) != 0)
112 if (rl.rlim_cur == RLIM_INFINITY)
114 if (rl.rlim_cur > LONG_MAX) {
119 * struct __sFILE currently has a limitation that
120 * file descriptors must fit in a signed short.
121 * This doesn't precisely capture the letter of POSIX
122 * but approximates the spirit.
124 if (rl.rlim_cur > SHRT_MAX)
127 return ((long)rl.rlim_cur);
128 case _SC_JOB_CONTROL:
129 return (_POSIX_JOB_CONTROL);
131 /* XXX - must be 1 */
133 mib[1] = KERN_SAVED_IDS;
137 mib[1] = KERN_POSIX1;
139 case _SC_BC_BASE_MAX:
140 return (BC_BASE_MAX);
143 case _SC_BC_SCALE_MAX:
144 return (BC_SCALE_MAX);
145 case _SC_BC_STRING_MAX:
146 return (BC_STRING_MAX);
147 case _SC_COLL_WEIGHTS_MAX:
148 return (COLL_WEIGHTS_MAX);
149 case _SC_EXPR_NEST_MAX:
150 return (EXPR_NEST_MAX);
157 * This is something of a lie, but it would be silly at
158 * this point to try to deduce this from the contents
161 return (_POSIX2_VERSION);
163 return (_POSIX2_C_BIND);
165 return (_POSIX2_C_DEV);
166 case _SC_2_CHAR_TERM:
167 return (_POSIX2_CHAR_TERM);
169 return (_POSIX2_FORT_DEV);
171 return (_POSIX2_FORT_RUN);
172 case _SC_2_LOCALEDEF:
173 return (_POSIX2_LOCALEDEF);
175 return (_POSIX2_SW_DEV);
177 return (_POSIX2_UPE);
179 path = _PATH_ZONEINFO;
183 lvalue = pathconf(path, _PC_NAME_MAX);
184 if (lvalue == -1 && errno != 0)
189 case _SC_ASYNCHRONOUS_IO:
190 #if _POSIX_ASYNCHRONOUS_IO == 0
191 mib[0] = CTL_P1003_1B;
192 mib[1] = CTL_P1003_1B_ASYNCHRONOUS_IO;
195 return (_POSIX_ASYNCHRONOUS_IO);
197 case _SC_MAPPED_FILES:
198 return (_POSIX_MAPPED_FILES);
200 return (_POSIX_MEMLOCK);
201 case _SC_MEMLOCK_RANGE:
202 return (_POSIX_MEMLOCK_RANGE);
203 case _SC_MEMORY_PROTECTION:
204 return (_POSIX_MEMORY_PROTECTION);
205 case _SC_MESSAGE_PASSING:
206 return (_POSIX_MESSAGE_PASSING);
207 case _SC_PRIORITIZED_IO:
208 #if _POSIX_PRIORITIZED_IO == 0
209 mib[0] = CTL_P1003_1B;
210 mib[1] = CTL_P1003_1B_PRIORITIZED_IO;
213 return (_POSIX_PRIORITIZED_IO);
215 case _SC_PRIORITY_SCHEDULING:
216 #if _POSIX_PRIORITY_SCHEDULING == 0
217 mib[0] = CTL_P1003_1B;
218 mib[1] = CTL_P1003_1B_PRIORITY_SCHEDULING;
221 return (_POSIX_PRIORITY_SCHEDULING);
223 case _SC_REALTIME_SIGNALS:
224 #if _POSIX_REALTIME_SIGNALS == 0
225 mib[0] = CTL_P1003_1B;
226 mib[1] = CTL_P1003_1B_REALTIME_SIGNALS;
229 return (_POSIX_REALTIME_SIGNALS);
232 #if _POSIX_SEMAPHORES == 0
233 mib[0] = CTL_P1003_1B;
234 mib[1] = CTL_P1003_1B_SEMAPHORES;
237 return (_POSIX_SEMAPHORES);
240 return (_POSIX_FSYNC);
242 case _SC_SHARED_MEMORY_OBJECTS:
243 return (_POSIX_SHARED_MEMORY_OBJECTS);
244 case _SC_SYNCHRONIZED_IO:
245 #if _POSIX_SYNCHRONIZED_IO == 0
246 mib[0] = CTL_P1003_1B;
247 mib[1] = CTL_P1003_1B_SYNCHRONIZED_IO;
250 return (_POSIX_SYNCHRONIZED_IO);
253 #if _POSIX_TIMERS == 0
254 mib[0] = CTL_P1003_1B;
255 mib[1] = CTL_P1003_1B_TIMERS;
258 return (_POSIX_TIMERS);
260 case _SC_AIO_LISTIO_MAX:
261 mib[0] = CTL_P1003_1B;
262 mib[1] = CTL_P1003_1B_AIO_LISTIO_MAX;
265 mib[0] = CTL_P1003_1B;
266 mib[1] = CTL_P1003_1B_AIO_MAX;
268 case _SC_AIO_PRIO_DELTA_MAX:
269 mib[0] = CTL_P1003_1B;
270 mib[1] = CTL_P1003_1B_AIO_PRIO_DELTA_MAX;
272 case _SC_DELAYTIMER_MAX:
273 mib[0] = CTL_P1003_1B;
274 mib[1] = CTL_P1003_1B_DELAYTIMER_MAX;
277 defaultresult = getpagesize();
278 mib[0] = CTL_P1003_1B;
279 mib[1] = CTL_P1003_1B_PAGESIZE;
282 mib[0] = CTL_P1003_1B;
283 mib[1] = CTL_P1003_1B_RTSIG_MAX;
285 case _SC_SEM_NSEMS_MAX:
286 mib[0] = CTL_P1003_1B;
287 mib[1] = CTL_P1003_1B_SEM_NSEMS_MAX;
289 case _SC_SEM_VALUE_MAX:
290 mib[0] = CTL_P1003_1B;
291 mib[1] = CTL_P1003_1B_SEM_VALUE_MAX;
293 case _SC_SIGQUEUE_MAX:
294 mib[0] = CTL_P1003_1B;
295 mib[1] = CTL_P1003_1B_SIGQUEUE_MAX;
298 mib[0] = CTL_P1003_1B;
299 mib[1] = CTL_P1003_1B_TIMER_MAX;
302 if (sysctl(mib, 2, &value, &len, NULL, 0) == -1)
305 return (defaultresult);
306 return ((long)value);
309 case _SC_2_PBS_ACCOUNTING:
310 case _SC_2_PBS_CHECKPOINT:
311 case _SC_2_PBS_LOCATE:
312 case _SC_2_PBS_MESSAGE:
313 case _SC_2_PBS_TRACK:
315 #error "don't know how to determine _SC_2_PBS"
317 * This probably requires digging through the filesystem
318 * to see if the appropriate package has been installed.
319 * Since we don't currently support this option at all,
320 * it's not worth the effort to write the code now.
321 * Figuring out which of the sub-options are supported
322 * would be even more difficult, so it's probably easier
323 * to always say ``no''.
326 return (_POSIX2_PBS);
328 case _SC_ADVISORY_INFO:
329 #if _POSIX_ADVISORY_INFO == 0
330 #error "_POSIX_ADVISORY_INFO"
332 return (_POSIX_ADVISORY_INFO);
335 #if _POSIX_BARRIERS == 0
336 #error "_POSIX_BARRIERS"
338 return (_POSIX_BARRIERS);
340 case _SC_CLOCK_SELECTION:
341 #if _POSIX_CLOCK_SELECTION == 0
342 #error "_POSIX_CLOCK_SELECTION"
344 return (_POSIX_CLOCK_SELECTION);
347 #if _POSIX_CPUTIME == 0
348 #error "_POSIX_CPUTIME"
350 return (_POSIX_CPUTIME);
353 case _SC_FILE_LOCKING:
355 * XXX - The standard doesn't tell us how to define
356 * _POSIX_FILE_LOCKING, so we can't answer this one.
359 #if _POSIX_THREAD_SAFE_FUNCTIONS > -1
360 case _SC_GETGR_R_SIZE_MAX:
361 case _SC_GETPW_R_SIZE_MAX:
362 #error "somebody needs to implement this"
364 case _SC_HOST_NAME_MAX:
365 return (MAXHOSTNAMELEN - 1); /* does not include \0 */
366 case _SC_LOGIN_NAME_MAX:
368 case _SC_MONOTONIC_CLOCK:
369 #if _POSIX_MONOTONIC_CLOCK == 0
370 #error "_POSIX_MONOTONIC_CLOCK"
372 return (_POSIX_MONOTONIC_CLOCK);
374 case _SC_MQ_OPEN_MAX:
375 len = sizeof(lvalue);
376 if (sysctlbyname("kern.mqueue.mq_open_max", &lvalue, &len,
381 case _SC_MQ_PRIO_MAX:
382 len = sizeof(lvalue);
383 if (sysctlbyname("kern.mqueue.mq_prio_max", &lvalue, &len,
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:
589 #ifdef _SC_PHYS_PAGES
591 len = sizeof(lvalue);
592 if (sysctlbyname("hw.availpages", &lvalue, &len, NULL, 0) == -1)
602 if (sysctl(mib, 2, &value, &len, NULL, 0) == -1)
604 return ((long)value);