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 "namespace.h"
36 #include <sys/param.h>
38 #include <sys/sysctl.h>
39 #include <sys/resource.h>
40 #include <sys/socket.h>
46 #include <pthread.h> /* we just need the limits */
47 #include <semaphore.h>
50 #include "un-namespace.h"
52 #include "../stdlib/atexit.h"
53 #include "tzdir.h" /* from ../../../contrib/tzcode/stdtime */
54 #include "libc_private.h"
56 #define _PATH_ZONEINFO TZDIR /* from tzfile.h */
60 * get configurable system variables.
63 * POSIX 1003.1 (ISO/IEC 9945-1, 4.8.1.3) states that the variable values
64 * not change during the lifetime of the calling process. This would seem
65 * to require that any change to system limits kill all running processes.
66 * A workaround might be to cache the values when they are first retrieved
67 * and then simply return the cached value on subsequent calls. This is
68 * 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 return (getpagesize());
292 mib[0] = CTL_P1003_1B;
293 mib[1] = CTL_P1003_1B_RTSIG_MAX;
295 case _SC_SEM_NSEMS_MAX:
297 case _SC_SEM_VALUE_MAX:
298 return (SEM_VALUE_MAX);
299 case _SC_SIGQUEUE_MAX:
300 mib[0] = CTL_P1003_1B;
301 mib[1] = CTL_P1003_1B_SIGQUEUE_MAX;
304 mib[0] = CTL_P1003_1B;
305 mib[1] = CTL_P1003_1B_TIMER_MAX;
308 if (sysctl(mib, 2, &value, &len, NULL, 0) == -1)
311 return (defaultresult);
312 return ((long)value);
315 case _SC_2_PBS_ACCOUNTING:
316 case _SC_2_PBS_CHECKPOINT:
317 case _SC_2_PBS_LOCATE:
318 case _SC_2_PBS_MESSAGE:
319 case _SC_2_PBS_TRACK:
321 #error "don't know how to determine _SC_2_PBS"
323 * This probably requires digging through the filesystem
324 * to see if the appropriate package has been installed.
325 * Since we don't currently support this option at all,
326 * it's not worth the effort to write the code now.
327 * Figuring out which of the sub-options are supported
328 * would be even more difficult, so it's probably easier
329 * to always say ``no''.
332 return (_POSIX2_PBS);
334 case _SC_ADVISORY_INFO:
335 #if _POSIX_ADVISORY_INFO == 0
336 #error "_POSIX_ADVISORY_INFO"
338 return (_POSIX_ADVISORY_INFO);
341 #if _POSIX_BARRIERS == 0
342 #error "_POSIX_BARRIERS"
344 return (_POSIX_BARRIERS);
346 case _SC_CLOCK_SELECTION:
347 #if _POSIX_CLOCK_SELECTION == 0
348 #error "_POSIX_CLOCK_SELECTION"
350 return (_POSIX_CLOCK_SELECTION);
353 return (_POSIX_CPUTIME);
355 case _SC_FILE_LOCKING:
357 * XXX - The standard doesn't tell us how to define
358 * _POSIX_FILE_LOCKING, so we can't answer this one.
363 * SUSv4tc1 says the following about _SC_GETGR_R_SIZE_MAX and
364 * _SC_GETPW_R_SIZE_MAX:
365 * Note that sysconf(_SC_GETGR_R_SIZE_MAX) may return -1 if
366 * there is no hard limit on the size of the buffer needed to
367 * store all the groups returned.
369 case _SC_GETGR_R_SIZE_MAX:
370 case _SC_GETPW_R_SIZE_MAX:
372 case _SC_HOST_NAME_MAX:
373 return (MAXHOSTNAMELEN - 1); /* does not include \0 */
374 case _SC_LOGIN_NAME_MAX:
376 case _SC_MONOTONIC_CLOCK:
377 #if _POSIX_MONOTONIC_CLOCK == 0
378 #error "_POSIX_MONOTONIC_CLOCK"
380 return (_POSIX_MONOTONIC_CLOCK);
382 #if _POSIX_MESSAGE_PASSING > -1
383 case _SC_MQ_PRIO_MAX:
384 return (MQ_PRIO_MAX);
386 case _SC_READER_WRITER_LOCKS:
387 return (_POSIX_READER_WRITER_LOCKS);
389 return (_POSIX_REGEXP);
391 return (_POSIX_SHELL);
393 return (_POSIX_SPAWN);
395 return (_POSIX_SPIN_LOCKS);
396 case _SC_SPORADIC_SERVER:
397 #if _POSIX_SPORADIC_SERVER == 0
398 #error "_POSIX_SPORADIC_SERVER"
400 return (_POSIX_SPORADIC_SERVER);
402 case _SC_THREAD_ATTR_STACKADDR:
403 return (_POSIX_THREAD_ATTR_STACKADDR);
404 case _SC_THREAD_ATTR_STACKSIZE:
405 return (_POSIX_THREAD_ATTR_STACKSIZE);
406 case _SC_THREAD_CPUTIME:
407 return (_POSIX_THREAD_CPUTIME);
408 case _SC_THREAD_DESTRUCTOR_ITERATIONS:
409 return (PTHREAD_DESTRUCTOR_ITERATIONS);
410 case _SC_THREAD_KEYS_MAX:
411 return (PTHREAD_KEYS_MAX);
412 case _SC_THREAD_PRIO_INHERIT:
413 return (_POSIX_THREAD_PRIO_INHERIT);
414 case _SC_THREAD_PRIO_PROTECT:
415 return (_POSIX_THREAD_PRIO_PROTECT);
416 case _SC_THREAD_PRIORITY_SCHEDULING:
417 return (_POSIX_THREAD_PRIORITY_SCHEDULING);
418 case _SC_THREAD_PROCESS_SHARED:
419 return (_POSIX_THREAD_PROCESS_SHARED);
420 case _SC_THREAD_SAFE_FUNCTIONS:
421 return (_POSIX_THREAD_SAFE_FUNCTIONS);
422 case _SC_THREAD_STACK_MIN:
423 return (PTHREAD_STACK_MIN);
424 case _SC_THREAD_THREADS_MAX:
425 return (PTHREAD_THREADS_MAX); /* XXX wrong type! */
427 return (_POSIX_TIMEOUTS);
429 return (_POSIX_THREADS);
431 #if _POSIX_TRACE == 0
432 #error "_POSIX_TRACE"
433 /* While you're implementing this, also do the ones below. */
435 return (_POSIX_TRACE);
437 #if _POSIX_TRACE > -1
438 case _SC_TRACE_EVENT_FILTER:
439 return (_POSIX_TRACE_EVENT_FILTER);
440 case _SC_TRACE_INHERIT:
441 return (_POSIX_TRACE_INHERIT);
443 return (_POSIX_TRACE_LOG);
445 case _SC_TTY_NAME_MAX:
448 case _SC_TYPED_MEMORY_OBJECTS:
449 #if _POSIX_TYPED_MEMORY_OBJECTS == 0
450 #error "_POSIX_TYPED_MEMORY_OBJECTS"
452 return (_POSIX_TYPED_MEMORY_OBJECTS);
454 case _SC_V6_ILP32_OFF32:
455 #if _V6_ILP32_OFF32 == 0
456 if (sizeof(int) * CHAR_BIT == 32 &&
457 sizeof(int) == sizeof(long) &&
458 sizeof(long) == sizeof(void *) &&
459 sizeof(void *) == sizeof(off_t))
464 return (_V6_ILP32_OFF32);
466 case _SC_V6_ILP32_OFFBIG:
467 #if _V6_ILP32_OFFBIG == 0
468 if (sizeof(int) * CHAR_BIT == 32 &&
469 sizeof(int) == sizeof(long) &&
470 sizeof(long) == sizeof(void *) &&
471 sizeof(off_t) * CHAR_BIT >= 64)
476 return (_V6_ILP32_OFFBIG);
478 case _SC_V6_LP64_OFF64:
479 #if _V6_LP64_OFF64 == 0
480 if (sizeof(int) * CHAR_BIT == 32 &&
481 sizeof(long) * CHAR_BIT == 64 &&
482 sizeof(long) == sizeof(void *) &&
483 sizeof(void *) == sizeof(off_t))
488 return (_V6_LP64_OFF64);
490 case _SC_V6_LPBIG_OFFBIG:
491 #if _V6_LPBIG_OFFBIG == 0
492 if (sizeof(int) * CHAR_BIT >= 32 &&
493 sizeof(long) * CHAR_BIT >= 64 &&
494 sizeof(void *) * CHAR_BIT >= 64 &&
495 sizeof(off_t) * CHAR_BIT >= 64)
500 return (_V6_LPBIG_OFFBIG);
503 return (ATEXIT_SIZE);
506 mib[1] = KERN_IOV_MAX;
508 case _SC_XOPEN_CRYPT:
509 return (_XOPEN_CRYPT);
510 case _SC_XOPEN_ENH_I18N:
511 return (_XOPEN_ENH_I18N);
512 case _SC_XOPEN_LEGACY:
513 return (_XOPEN_LEGACY);
514 case _SC_XOPEN_REALTIME:
515 #if _XOPEN_REALTIME == 0
517 value = sysconf(_SC_ASYNCHRONOUS_IO) > 0 &&
518 sysconf(_SC_MEMLOCK) > 0 &&
519 sysconf(_SC_MEMLOCK_RANGE) > 0 &&
520 sysconf(_SC_MESSAGE_PASSING) > 0 &&
521 sysconf(_SC_PRIORITY_SCHEDULING) > 0 &&
522 sysconf(_SC_REALTIME_SIGNALS) > 0 &&
523 sysconf(_SC_SEMAPHORES) > 0 &&
524 sysconf(_SC_SHARED_MEMORY_OBJECTS) > 0 &&
525 sysconf(_SC_SYNCHRONIZED_IO) > 0 &&
526 sysconf(_SC_TIMERS) > 0;
533 return (_XOPEN_REALTIME);
535 case _SC_XOPEN_REALTIME_THREADS:
536 #if _XOPEN_REALTIME_THREADS == 0
537 #error "_XOPEN_REALTIME_THREADS"
539 return (_XOPEN_REALTIME_THREADS);
542 len = sizeof(lvalue);
544 if (sysctlbyname("kern.ipc.shmmin", &lvalue, &len, NULL,
551 case _SC_XOPEN_STREAMS:
552 return (_XOPEN_STREAMS);
554 return (_XOPEN_UNIX);
555 #ifdef _XOPEN_VERSION
556 case _SC_XOPEN_VERSION:
557 return (_XOPEN_VERSION);
559 #ifdef _XOPEN_XCU_VERSION
560 case _SC_XOPEN_XCU_VERSION:
561 return (_XOPEN_XCU_VERSION);
563 case _SC_SYMLOOP_MAX:
564 return (MAXSYMLINKS);
565 case _SC_RAW_SOCKETS:
566 return (_POSIX_RAW_SOCKETS);
570 value = _socket(PF_INET6, SOCK_DGRAM, 0);
578 return (_POSIX_IPV6);
581 case _SC_NPROCESSORS_CONF:
582 case _SC_NPROCESSORS_ONLN:
583 if (_elf_aux_info(AT_NCPUS, &value, sizeof(value)) == 0)
584 return ((long)value);
589 #ifdef _SC_PHYS_PAGES
591 len = sizeof(lvalue);
592 if (sysctlbyname("hw.availpages", &lvalue, &len, NULL, 0) == -1)
597 #ifdef _SC_CPUSET_SIZE
598 case _SC_CPUSET_SIZE:
600 if (sysctlbyname("kern.sched.cpusetsize", &value, &len, NULL,
603 return ((long)value);
611 if (sysctl(mib, 2, &value, &len, NULL, 0) == -1)
613 return ((long)value);