1 /* Copyright (C) 1991-2023 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18 #include <errno.h>
19 #include <limits.h>
20 #include <grp.h>
21 #include <pwd.h>
22 #include <stddef.h>
23 #include <stdio.h>
24 #include <stdlib.h>
25 #include <string.h>
26 #include <time.h>
27 #include <unistd.h>
28 #include <sys/param.h>
29 #include <sys/stat.h>
30 #include <sys/sysinfo.h>
31 #include <sys/types.h>
32 #include <sys/uio.h>
33 #include <regex.h>
34 #include <signal.h>
35 #include <sysconf-pthread_stack_min.h>
36
37 #define NEED_SPEC_ARRAY 0
38 #include <posix-conf-vars.h>
39
40 #if !defined _XBS5_ILP32_OFF32 || !defined _XBS5_ILP32_OFFBIG \
41 || !defined _XBS5_LP64_OFF64 || !defined _XBS5_LPBIG_OFFBIG \
42 || !defined _POSIX_V6_ILP32_OFF32 || !defined _POSIX_V6_ILP32_OFFBIG \
43 || !defined _POSIX_V6_LP64_OFF64 || !defined _POSIX_V6_LPBIG_OFFBIG \
44 || !defined _POSIX_V7_ILP32_OFF32 || !defined _POSIX_V7_ILP32_OFFBIG \
45 || !defined _POSIX_V7_LP64_OFF64 || !defined _POSIX_V7_LPBIG_OFFBIG
46 # define NEED_CHECK_SPEC 1
47 #else
48 # define NEED_CHECK_SPEC 0
49 #endif
50
51 #if NEED_CHECK_SPEC
52 static long int __sysconf_check_spec (const char *spec);
53 #endif
54
55
56 /* Get the value of the system variable NAME. */
57 long int
58 __sysconf (int name)
59 {
60 switch (name)
61 {
62 /* Also add obsolete or unnecessarily added constants here. */
63 case _SC_EQUIV_CLASS_MAX:
64 default:
65 __set_errno (EINVAL);
66 return -1;
67
68 case _SC_ARG_MAX:
69 #ifdef ARG_MAX
70 return ARG_MAX;
71 #else
72 return -1;
73 #endif
74
75 case _SC_CHILD_MAX:
76 #ifdef CHILD_MAX
77 return CHILD_MAX;
78 #else
79 return __get_child_max ();
80 #endif
81
82 case _SC_CLK_TCK:
83 return __getclktck ();
84
85 case _SC_NGROUPS_MAX:
86 #ifdef NGROUPS_MAX
87 return NGROUPS_MAX;
88 #else
89 return -1;
90 #endif
91
92 case _SC_OPEN_MAX:
93 return __getdtablesize ();
94
95 case _SC_STREAM_MAX:
96 #ifdef STREAM_MAX
97 return STREAM_MAX;
98 #else
99 return FOPEN_MAX;
100 #endif
101
102 case _SC_TZNAME_MAX:
103 return -1;
104
105 case _SC_JOB_CONTROL:
106 #if CONF_IS_DEFINED_SET (_POSIX_JOB_CONTROL)
107 return _POSIX_JOB_CONTROL;
108 #else
109 return -1;
110 #endif
111
112 case _SC_SAVED_IDS:
113 #if CONF_IS_DEFINED_SET (_POSIX_SAVED_IDS)
114 return 1;
115 #else
116 return -1;
117 #endif
118
119 case _SC_REALTIME_SIGNALS:
120 #if CONF_IS_DEFINED_SET (_POSIX_REALTIME_SIGNALS)
121 return _POSIX_REALTIME_SIGNALS;
122 #else
123 return -1;
124 #endif
125
126 case _SC_PRIORITY_SCHEDULING:
127 #if CONF_IS_DEFINED_SET (_POSIX_PRIORITY_SCHEDULING)
128 return _POSIX_PRIORITY_SCHEDULING;
129 #else
130 return -1;
131 #endif
132
133 case _SC_TIMERS:
134 #if CONF_IS_DEFINED_SET (_POSIX_TIMERS)
135 return _POSIX_TIMERS;
136 #else
137 return -1;
138 #endif
139
140 case _SC_ASYNCHRONOUS_IO:
141 #if CONF_IS_DEFINED_SET (_POSIX_ASYNCHRONOUS_IO)
142 return _POSIX_ASYNCHRONOUS_IO;
143 #else
144 return -1;
145 #endif
146
147 case _SC_PRIORITIZED_IO:
148 #if CONF_IS_DEFINED_SET (_POSIX_PRIORITIZED_IO)
149 return _POSIX_PRIORITIZED_IO;
150 #else
151 return -1;
152 #endif
153
154 case _SC_SYNCHRONIZED_IO:
155 #if CONF_IS_DEFINED_SET (_POSIX_SYNCHRONIZED_IO)
156 return _POSIX_SYNCHRONIZED_IO;
157 #else
158 return -1;
159 #endif
160
161 case _SC_FSYNC:
162 #if CONF_IS_DEFINED_SET (_POSIX_FSYNC)
163 return _POSIX_FSYNC;
164 #else
165 return -1;
166 #endif
167
168 case _SC_MAPPED_FILES:
169 #if CONF_IS_DEFINED_SET (_POSIX_MAPPED_FILES)
170 return _POSIX_MAPPED_FILES;
171 #else
172 return -1;
173 #endif
174
175 case _SC_MEMLOCK:
176 #if CONF_IS_DEFINED_SET (_POSIX_MEMLOCK)
177 return _POSIX_MEMLOCK;
178 #else
179 return -1;
180 #endif
181
182 case _SC_MEMLOCK_RANGE:
183 #if CONF_IS_DEFINED_SET (_POSIX_MEMLOCK_RANGE)
184 return _POSIX_MEMLOCK_RANGE;
185 #else
186 return -1;
187 #endif
188
189 case _SC_MEMORY_PROTECTION:
190 #if CONF_IS_DEFINED_SET (_POSIX_MEMORY_PROTECTION)
191 return _POSIX_MEMORY_PROTECTION;
192 #else
193 return -1;
194 #endif
195
196 case _SC_MESSAGE_PASSING:
197 #if CONF_IS_DEFINED_SET (_POSIX_MESSAGE_PASSING)
198 return _POSIX_MESSAGE_PASSING;
199 #else
200 return -1;
201 #endif
202
203 case _SC_SEMAPHORES:
204 #if CONF_IS_DEFINED_SET (_POSIX_SEMAPHORES)
205 return _POSIX_SEMAPHORES;
206 #else
207 return -1;
208 #endif
209
210 case _SC_SHARED_MEMORY_OBJECTS:
211 #if CONF_IS_DEFINED_SET (_POSIX_SHARED_MEMORY_OBJECTS)
212 return _POSIX_SHARED_MEMORY_OBJECTS;
213 #else
214 return -1;
215 #endif
216
217 case _SC_VERSION:
218 return _POSIX_VERSION;
219
220 case _SC_PAGESIZE:
221 return __getpagesize ();
222
223 case _SC_AIO_LISTIO_MAX:
224 #ifdef AIO_LISTIO_MAX
225 return AIO_LISTIO_MAX;
226 #else
227 return -1;
228 #endif
229
230 case _SC_AIO_MAX:
231 #ifdef AIO_MAX
232 return AIO_MAX;
233 #else
234 return -1;
235 #endif
236
237 case _SC_AIO_PRIO_DELTA_MAX:
238 #ifdef AIO_PRIO_DELTA_MAX
239 return AIO_PRIO_DELTA_MAX;
240 #else
241 return -1;
242 #endif
243
244 case _SC_DELAYTIMER_MAX:
245 #ifdef DELAYTIMER_MAX
246 return DELAYTIMER_MAX;
247 #else
248 return -1;
249 #endif
250
251 case _SC_MQ_OPEN_MAX:
252 #ifdef MQ_OPEN_MAX
253 return MQ_OPEN_MAX;
254 #else
255 return -1;
256 #endif
257
258 case _SC_MQ_PRIO_MAX:
259 #ifdef MQ_PRIO_MAX
260 return MQ_PRIO_MAX;
261 #else
262 return -1;
263 #endif
264
265 case _SC_RTSIG_MAX:
266 #ifdef RTSIG_MAX
267 return RTSIG_MAX;
268 #else
269 return -1;
270 #endif
271
272 case _SC_SEM_NSEMS_MAX:
273 #ifdef SEM_NSEMS_MAX
274 return SEM_NSEMS_MAX;
275 #else
276 return -1;
277 #endif
278
279 case _SC_SEM_VALUE_MAX:
280 #ifdef SEM_VALUE_MAX
281 return SEM_VALUE_MAX;
282 #else
283 return -1;
284 #endif
285
286 case _SC_SIGQUEUE_MAX:
287 #ifdef SIGQUEUE_MAX
288 return SIGQUEUE_MAX;
289 #else
290 return -1;
291 #endif
292
293 case _SC_TIMER_MAX:
294 #ifdef TIMER_MAX
295 return TIMER_MAX;
296 #else
297 return -1;
298 #endif
299
300 case _SC_BC_BASE_MAX:
301 #ifdef BC_BASE_MAX
302 return BC_BASE_MAX;
303 #else
304 return -1;
305 #endif
306
307 case _SC_BC_DIM_MAX:
308 #ifdef BC_DIM_MAX
309 return BC_DIM_MAX;
310 #else
311 return -1;
312 #endif
313
314 case _SC_BC_SCALE_MAX:
315 #ifdef BC_SCALE_MAX
316 return BC_SCALE_MAX;
317 #else
318 return -1;
319 #endif
320
321 case _SC_BC_STRING_MAX:
322 #ifdef BC_STRING_MAX
323 return BC_STRING_MAX;
324 #else
325 return -1;
326 #endif
327
328 case _SC_COLL_WEIGHTS_MAX:
329 #ifdef COLL_WEIGHTS_MAX
330 return COLL_WEIGHTS_MAX;
331 #else
332 return -1;
333 #endif
334
335 case _SC_EXPR_NEST_MAX:
336 #ifdef EXPR_NEST_MAX
337 return EXPR_NEST_MAX;
338 #else
339 return -1;
340 #endif
341
342 case _SC_LINE_MAX:
343 #ifdef LINE_MAX
344 return LINE_MAX;
345 #else
346 return -1;
347 #endif
348
349 case _SC_RE_DUP_MAX:
350 #ifdef RE_DUP_MAX
351 return RE_DUP_MAX;
352 #else
353 return -1;
354 #endif
355
356 case _SC_CHARCLASS_NAME_MAX:
357 #ifdef CHARCLASS_NAME_MAX
358 return CHARCLASS_NAME_MAX;
359 #else
360 return -1;
361 #endif
362
363 case _SC_PII:
364 #if CONF_IS_DEFINED_SET (_POSIX_PII)
365 return 1;
366 #else
367 return -1;
368 #endif
369
370 case _SC_PII_XTI:
371 #if CONF_IS_DEFINED_SET (_POSIX_PII_XTI)
372 return 1;
373 #else
374 return -1;
375 #endif
376
377 case _SC_PII_SOCKET:
378 #if CONF_IS_DEFINED_SET (_POSIX_PII_SOCKET)
379 return 1;
380 #else
381 return -1;
382 #endif
383
384 case _SC_PII_INTERNET:
385 #if CONF_IS_DEFINED_SET (_POSIX_PII_INTERNET)
386 return 1;
387 #else
388 return -1;
389 #endif
390
391 case _SC_PII_OSI:
392 #if CONF_IS_DEFINED_SET (_POSIX_PII_OSI)
393 return 1;
394 #else
395 return -1;
396 #endif
397
398 case _SC_POLL:
399 #if CONF_IS_DEFINED_SET (_POSIX_POLL)
400 return 1;
401 #else
402 return -1;
403 #endif
404
405 case _SC_SELECT:
406 #if CONF_IS_DEFINED_SET (_POSIX_SELECT)
407 return 1;
408 #else
409 return -1;
410 #endif
411
412 /* The same as _SC_IOV_MAX. */
413 case _SC_UIO_MAXIOV:
414 #ifdef UIO_MAXIOV
415 return UIO_MAXIOV;
416 #else
417 return -1;
418 #endif
419
420 case _SC_PII_INTERNET_STREAM:
421 #if CONF_IS_DEFINED_SET (_POSIX_PII_INTERNET_STREAM)
422 return 1;
423 #else
424 return -1;
425 #endif
426
427 case _SC_PII_INTERNET_DGRAM:
428 #if CONF_IS_DEFINED_SET (_POSIX_PII_INTERNET_DGRAM)
429 return 1;
430 #else
431 return -1;
432 #endif
433
434 case _SC_PII_OSI_COTS:
435 #if CONF_IS_DEFINED_SET (_POSIX_PII_OSI_COTS)
436 return 1;
437 #else
438 return -1;
439 #endif
440
441 case _SC_PII_OSI_CLTS:
442 #if CONF_IS_DEFINED_SET (_POSIX_PII_OSI_CLTS)
443 return 1;
444 #else
445 return -1;
446 #endif
447
448 case _SC_PII_OSI_M:
449 #if CONF_IS_DEFINED_SET (_POSIX_PII_OSI_M)
450 return 1;
451 #else
452 return -1;
453 #endif
454
455 case _SC_T_IOV_MAX:
456 #ifdef _T_IOV_MAX
457 return _T_IOV_MAX;
458 #else
459 return -1;
460 #endif
461
462 case _SC_2_VERSION:
463 return _POSIX2_VERSION;
464
465 case _SC_2_C_BIND:
466 #ifdef _POSIX2_C_BIND
467 return _POSIX2_C_BIND;
468 #else
469 return -1;
470 #endif
471
472 case _SC_2_C_DEV:
473 #ifdef _POSIX2_C_DEV
474 return _POSIX2_C_DEV;
475 #else
476 return -1;
477 #endif
478
479 case _SC_2_C_VERSION:
480 #ifdef _POSIX2_C_VERSION
481 return _POSIX2_C_VERSION;
482 #else
483 return -1;
484 #endif
485
486 case _SC_2_FORT_DEV:
487 #ifdef _POSIX2_FORT_DEV
488 return _POSIX2_FORT_DEV;
489 #else
490 return -1;
491 #endif
492
493 case _SC_2_FORT_RUN:
494 #ifdef _POSIX2_FORT_RUN
495 return _POSIX2_FORT_RUN;
496 #else
497 return -1;
498 #endif
499
500 case _SC_2_LOCALEDEF:
501 #ifdef _POSIX2_LOCALEDEF
502 return _POSIX2_LOCALEDEF;
503 #else
504 return -1;
505 #endif
506
507 case _SC_2_SW_DEV:
508 #ifdef _POSIX2_SW_DEV
509 return _POSIX2_SW_DEV;
510 #else
511 return -1;
512 #endif
513
514 case _SC_2_CHAR_TERM:
515 #ifdef _POSIX2_CHAR_TERM
516 return _POSIX2_CHAR_TERM;
517 #else
518 return -1;
519 #endif
520
521 case _SC_2_UPE:
522 #ifdef _POSIX2_UPE
523 return _POSIX2_UPE;
524 #else
525 return -1;
526 #endif
527
528 /* POSIX 1003.1c (POSIX Threads). */
529 case _SC_THREADS:
530 #if CONF_IS_DEFINED_SET (_POSIX_THREADS)
531 return _POSIX_THREADS;
532 #else
533 return -1;
534 #endif
535
536 case _SC_THREAD_SAFE_FUNCTIONS:
537 #if CONF_IS_DEFINED_SET (_POSIX_THREAD_SAFE_FUNCTIONS)
538 return _POSIX_THREAD_SAFE_FUNCTIONS;
539 #else
540 return -1;
541 #endif
542
543 case _SC_GETGR_R_SIZE_MAX:
544 return NSS_BUFLEN_GROUP;
545
546 case _SC_GETPW_R_SIZE_MAX:
547 return NSS_BUFLEN_PASSWD;
548
549 case _SC_LOGIN_NAME_MAX:
550 #ifdef LOGIN_NAME_MAX
551 return LOGIN_NAME_MAX;
552 #else
553 return -1;
554 #endif
555
556 case _SC_TTY_NAME_MAX:
557 #ifdef TTY_NAME_MAX
558 return TTY_NAME_MAX;
559 #else
560 return -1;
561 #endif
562
563 case _SC_THREAD_DESTRUCTOR_ITERATIONS:
564 #if CONF_IS_DEFINED_SET (_POSIX_THREAD_DESTRUCTOR_ITERATIONS)
565 return _POSIX_THREAD_DESTRUCTOR_ITERATIONS;
566 #else
567 return -1;
568 #endif
569
570 case _SC_THREAD_KEYS_MAX:
571 #ifdef PTHREAD_KEYS_MAX
572 return PTHREAD_KEYS_MAX;
573 #else
574 return -1;
575 #endif
576
577 case _SC_THREAD_STACK_MIN:
578 return __get_pthread_stack_min ();
579
580 case _SC_THREAD_THREADS_MAX:
581 #ifdef PTHREAD_THREADS_MAX
582 return PTHREAD_THREADS_MAX;
583 #else
584 return -1;
585 #endif
586
587 case _SC_THREAD_ATTR_STACKADDR:
588 #if CONF_IS_DEFINED_SET (_POSIX_THREAD_ATTR_STACKADDR)
589 return _POSIX_THREAD_ATTR_STACKADDR;
590 #else
591 return -1;
592 #endif
593
594 case _SC_THREAD_ATTR_STACKSIZE:
595 #if CONF_IS_DEFINED_SET (_POSIX_THREAD_ATTR_STACKSIZE)
596 return _POSIX_THREAD_ATTR_STACKSIZE;
597 #else
598 return -1;
599 #endif
600
601 case _SC_THREAD_PRIORITY_SCHEDULING:
602 #if CONF_IS_DEFINED_SET (_POSIX_THREAD_PRIORITY_SCHEDULING)
603 return _POSIX_THREAD_PRIORITY_SCHEDULING;
604 #else
605 return -1;
606 #endif
607
608 case _SC_THREAD_PRIO_INHERIT:
609 #if CONF_IS_DEFINED_SET (_POSIX_THREAD_PRIO_INHERIT)
610 return _POSIX_THREAD_PRIO_INHERIT;
611 #else
612 return -1;
613 #endif
614
615 case _SC_THREAD_PRIO_PROTECT:
616 #if CONF_IS_DEFINED_SET (_POSIX_THREAD_PRIO_PROTECT)
617 return _POSIX_THREAD_PRIO_PROTECT;
618 #else
619 return -1;
620 #endif
621
622 case _SC_THREAD_PROCESS_SHARED:
623 #if CONF_IS_DEFINED_SET (_POSIX_THREAD_PROCESS_SHARED)
624 return _POSIX_THREAD_PROCESS_SHARED;
625 #else
626 return -1;
627 #endif
628
629 case _SC_NPROCESSORS_CONF:
630 return __get_nprocs_conf ();
631
632 case _SC_NPROCESSORS_ONLN:
633 return __get_nprocs ();
634
635 case _SC_PHYS_PAGES:
636 return __get_phys_pages ();
637
638 case _SC_AVPHYS_PAGES:
639 return __get_avphys_pages ();
640
641 case _SC_ATEXIT_MAX:
642 /* We have no limit since we use lists. */
643 return INT_MAX;
644
645 case _SC_PASS_MAX:
646 /* We have no limit but since the return value might be used to
647 allocate a buffer we restrict the value. */
648 return BUFSIZ;
649
650 case _SC_XOPEN_VERSION:
651 return _XOPEN_VERSION;
652
653 case _SC_XOPEN_XCU_VERSION:
654 return _XOPEN_XCU_VERSION;
655
656 case _SC_XOPEN_UNIX:
657 return _XOPEN_UNIX;
658
659 case _SC_XOPEN_CRYPT:
660 #ifdef _XOPEN_CRYPT
661 return _XOPEN_CRYPT;
662 #else
663 return -1;
664 #endif
665
666 case _SC_XOPEN_ENH_I18N:
667 #ifdef _XOPEN_ENH_I18N
668 return _XOPEN_ENH_I18N;
669 #else
670 return -1;
671 #endif
672
673 case _SC_XOPEN_SHM:
674 #ifdef _XOPEN_SHM
675 return _XOPEN_SHM;
676 #else
677 return -1;
678 #endif
679
680 case _SC_XOPEN_XPG2:
681 #ifdef _XOPEN_XPG2
682 return _XOPEN_XPG2;
683 #else
684 return -1;
685 #endif
686
687 case _SC_XOPEN_XPG3:
688 #ifdef _XOPEN_XPG3
689 return _XOPEN_XPG3;
690 #else
691 return -1;
692 #endif
693
694 case _SC_XOPEN_XPG4:
695 #ifdef _XOPEN_XPG4
696 return _XOPEN_XPG4;
697 #else
698 return -1;
699 #endif
700
701 case _SC_CHAR_BIT:
702 return CHAR_BIT;
703
704 case _SC_CHAR_MAX:
705 return CHAR_MAX;
706
707 case _SC_CHAR_MIN:
708 return CHAR_MIN;
709
710 case _SC_INT_MAX:
711 return INT_MAX;
712
713 case _SC_INT_MIN:
714 return INT_MIN;
715
716 case _SC_LONG_BIT:
717 return sizeof (long int) * CHAR_BIT;
718
719 case _SC_WORD_BIT:
720 return sizeof (int) * CHAR_BIT;
721
722 case _SC_MB_LEN_MAX:
723 return MB_LEN_MAX;
724
725 case _SC_NZERO:
726 return NZERO;
727
728 case _SC_SSIZE_MAX:
729 return _POSIX_SSIZE_MAX;
730
731 case _SC_SCHAR_MAX:
732 return SCHAR_MAX;
733
734 case _SC_SCHAR_MIN:
735 return SCHAR_MIN;
736
737 case _SC_SHRT_MAX:
738 return SHRT_MAX;
739
740 case _SC_SHRT_MIN:
741 return SHRT_MIN;
742
743 case _SC_UCHAR_MAX:
744 return UCHAR_MAX;
745
746 case _SC_UINT_MAX:
747 return UINT_MAX;
748
749 case _SC_ULONG_MAX:
750 return ULONG_MAX;
751
752 case _SC_USHRT_MAX:
753 return USHRT_MAX;
754
755 case _SC_NL_ARGMAX:
756 #ifdef NL_ARGMAX
757 return NL_ARGMAX;
758 #else
759 return -1;
760 #endif
761
762 case _SC_NL_LANGMAX:
763 #ifdef NL_LANGMAX
764 return NL_LANGMAX;
765 #else
766 return -1;
767 #endif
768
769 case _SC_NL_MSGMAX:
770 #ifdef NL_MSGMAX
771 return NL_MSGMAX;
772 #else
773 return -1;
774 #endif
775
776 case _SC_NL_NMAX:
777 #ifdef NL_NMAX
778 return NL_NMAX;
779 #else
780 return -1;
781 #endif
782
783 case _SC_NL_SETMAX:
784 #ifdef NL_SETMAX
785 return NL_SETMAX;
786 #else
787 return -1;
788 #endif
789
790 case _SC_NL_TEXTMAX:
791 #ifdef NL_TEXTMAX
792 return NL_TEXTMAX;
793 #else
794 return -1;
795 #endif
796
797 #define START_ENV_GROUP(VERSION) \
798 /* Empty. */
799
800 #define END_ENV_GROUP(VERSION) \
801 /* Empty. */
802
803 #define KNOWN_ABSENT_ENVIRONMENT(SC_PREFIX, ENV_PREFIX, SUFFIX) \
804 case _SC_##SC_PREFIX##_##SUFFIX: \
805 return _##ENV_PREFIX##_##SUFFIX;
806
807 #define KNOWN_PRESENT_ENVIRONMENT(SC_PREFIX, ENV_PREFIX, SUFFIX) \
808 case _SC_##SC_PREFIX##_##SUFFIX: \
809 return _##ENV_PREFIX##_##SUFFIX;
810
811 #define UNKNOWN_ENVIRONMENT(SC_PREFIX, ENV_PREFIX, SUFFIX) \
812 case _SC_##SC_PREFIX##_##SUFFIX: \
813 return __sysconf_check_spec (#SUFFIX);
814
815 #include <posix/posix-envs.def>
816
817 #undef START_ENV_GROUP
818 #undef END_ENV_GROUP
819 #undef KNOWN_ABSENT_ENVIRONMENT
820 #undef KNOWN_PRESENT_ENVIRONMENT
821 #undef UNKNOWN_ENVIRONMENT
822
823 case _SC_XOPEN_LEGACY:
824 return _XOPEN_LEGACY;
825
826 case _SC_XOPEN_REALTIME:
827 #ifdef _XOPEN_REALTIME
828 return _XOPEN_REALTIME;
829 #else
830 return -1;
831 #endif
832 case _SC_XOPEN_REALTIME_THREADS:
833 #ifdef _XOPEN_REALTIME_THREADS
834 return _XOPEN_REALTIME_THREADS;
835 #else
836 return -1;
837 #endif
838
839 case _SC_ADVISORY_INFO:
840 #if CONF_IS_DEFINED_SET (_POSIX_ADVISORY_INFO)
841 return _POSIX_ADVISORY_INFO;
842 #else
843 return -1;
844 #endif
845
846 case _SC_BARRIERS:
847 #if CONF_IS_DEFINED_SET (_POSIX_BARRIERS)
848 return _POSIX_BARRIERS;
849 #else
850 return -1;
851 #endif
852
853 case _SC_BASE:
854 #if CONF_IS_DEFINED_SET (_POSIX_BASE)
855 return _POSIX_BASE;
856 #else
857 return -1;
858 #endif
859 case _SC_C_LANG_SUPPORT:
860 #if CONF_IS_DEFINED_SET (_POSIX_C_LANG_SUPPORT)
861 return _POSIX_C_LANG_SUPPORT;
862 #else
863 return -1;
864 #endif
865 case _SC_C_LANG_SUPPORT_R:
866 #if CONF_IS_DEFINED_SET (_POSIX_C_LANG_SUPPORT_R)
867 return _POSIX_C_LANG_SUPPORT_R;
868 #else
869 return -1;
870 #endif
871
872 case _SC_CLOCK_SELECTION:
873 #if CONF_IS_DEFINED_SET (_POSIX_CLOCK_SELECTION)
874 return _POSIX_CLOCK_SELECTION;
875 #else
876 return -1;
877 #endif
878
879 case _SC_CPUTIME:
880 #if CONF_IS_DEFINED_SET (_POSIX_CPUTIME)
881 return _POSIX_CPUTIME;
882 #else
883 return -1;
884 #endif
885
886 case _SC_DEVICE_IO:
887 #if CONF_IS_DEFINED_SET (_POSIX_DEVICE_IO)
888 return _POSIX_DEVICE_IO;
889 #else
890 return -1;
891 #endif
892 case _SC_DEVICE_SPECIFIC:
893 #if CONF_IS_DEFINED_SET (_POSIX_DEVICE_SPECIFIC)
894 return _POSIX_DEVICE_SPECIFIC;
895 #else
896 return -1;
897 #endif
898 case _SC_DEVICE_SPECIFIC_R:
899 #if CONF_IS_DEFINED_SET (_POSIX_DEVICE_SPECIFIC_R)
900 return _POSIX_DEVICE_SPECIFIC_R;
901 #else
902 return -1;
903 #endif
904
905 case _SC_FD_MGMT:
906 #if CONF_IS_DEFINED_SET (_POSIX_FD_MGMT)
907 return _POSIX_FD_MGMT;
908 #else
909 return -1;
910 #endif
911
912 case _SC_FIFO:
913 #if CONF_IS_DEFINED_SET (_POSIX_FIFO)
914 return _POSIX_FIFO;
915 #else
916 return -1;
917 #endif
918 case _SC_PIPE:
919 #if CONF_IS_DEFINED_SET (_POSIX_PIPE)
920 return _POSIX_PIPE;
921 #else
922 return -1;
923 #endif
924
925 case _SC_FILE_ATTRIBUTES:
926 #if CONF_IS_DEFINED_SET (_POSIX_FILE_ATTRIBUTES)
927 return _POSIX_FILE_ATTRIBUTES;
928 #else
929 return -1;
930 #endif
931 case _SC_FILE_LOCKING:
932 #if CONF_IS_DEFINED_SET (_POSIX_FILE_LOCKING)
933 return _POSIX_FILE_LOCKING;
934 #else
935 return -1;
936 #endif
937 case _SC_FILE_SYSTEM:
938 #if CONF_IS_DEFINED_SET (_POSIX_FILE_SYSTEM)
939 return _POSIX_FILE_SYSTEM;
940 #else
941 return -1;
942 #endif
943
944 case _SC_MONOTONIC_CLOCK:
945 #if CONF_IS_DEFINED_SET (_POSIX_MONOTONIC_CLOCK)
946 return _POSIX_MONOTONIC_CLOCK;
947 #else
948 return -1;
949 #endif
950
951 case _SC_MULTI_PROCESS:
952 #if CONF_IS_DEFINED_SET (_POSIX_MULTI_PROCESS)
953 return _POSIX_MULTI_PROCESS;
954 #else
955 return -1;
956 #endif
957 case _SC_SINGLE_PROCESS:
958 #if CONF_IS_DEFINED_SET (_POSIX_SINGLE_PROCESS)
959 return _POSIX_SINGLE_PROCESS;
960 #else
961 return -1;
962 #endif
963
964 case _SC_NETWORKING:
965 #if CONF_IS_DEFINED_SET (_POSIX_NETWORKING)
966 return _POSIX_NETWORKING;
967 #else
968 return -1;
969 #endif
970
971 case _SC_READER_WRITER_LOCKS:
972 #if CONF_IS_DEFINED_SET (_POSIX_READER_WRITER_LOCKS)
973 return _POSIX_READER_WRITER_LOCKS;
974 #else
975 return -1;
976 #endif
977 case _SC_SPIN_LOCKS:
978 #if CONF_IS_DEFINED_SET (_POSIX_SPIN_LOCKS)
979 return _POSIX_SPIN_LOCKS;
980 #else
981 return -1;
982 #endif
983
984 case _SC_REGEXP:
985 #if CONF_IS_DEFINED_SET (_POSIX_REGEXP)
986 return _POSIX_REGEXP;
987 #else
988 return -1;
989 #endif
990 /* _REGEX_VERSION has been removed with IEEE Std 1003.1-2001/Cor 2-2004,
991 item XSH/TC2/D6/137. */
992 case _SC_REGEX_VERSION:
993 return -1;
994
995 case _SC_SHELL:
996 #if CONF_IS_DEFINED_SET (_POSIX_SHELL)
997 return _POSIX_SHELL;
998 #else
999 return -1;
1000 #endif
1001
1002 case _SC_SIGNALS:
1003 #if CONF_IS_DEFINED (_POSIX_SIGNALS)
1004 return _POSIX_SIGNALS;
1005 #else
1006 return -1;
1007 #endif
1008
1009 case _SC_SPAWN:
1010 #if CONF_IS_DEFINED_SET (_POSIX_SPAWN)
1011 return _POSIX_SPAWN;
1012 #else
1013 return -1;
1014 #endif
1015
1016 case _SC_SPORADIC_SERVER:
1017 #if CONF_IS_DEFINED_SET (_POSIX_SPORADIC_SERVER)
1018 return _POSIX_SPORADIC_SERVER;
1019 #else
1020 return -1;
1021 #endif
1022 case _SC_THREAD_SPORADIC_SERVER:
1023 #if CONF_IS_DEFINED_SET (_POSIX_THREAD_SPORADIC_SERVER)
1024 return _POSIX_THREAD_SPORADIC_SERVER;
1025 #else
1026 return -1;
1027 #endif
1028
1029 case _SC_SYSTEM_DATABASE:
1030 #if CONF_IS_DEFINED_SET (_POSIX_SYSTEM_DATABASE)
1031 return _POSIX_SYSTEM_DATABASE;
1032 #else
1033 return -1;
1034 #endif
1035 case _SC_SYSTEM_DATABASE_R:
1036 #if CONF_IS_DEFINED_SET (_POSIX_SYSTEM_DATABASE_R)
1037 return _POSIX_SYSTEM_DATABASE_R;
1038 #else
1039 return -1;
1040 #endif
1041
1042 case _SC_THREAD_CPUTIME:
1043 #if CONF_IS_DEFINED_SET (_POSIX_THREAD_CPUTIME)
1044 return _POSIX_THREAD_CPUTIME;
1045 #else
1046 return -1;
1047 #endif
1048
1049 case _SC_TIMEOUTS:
1050 #if CONF_IS_DEFINED_SET (_POSIX_TIMEOUTS)
1051 return _POSIX_TIMEOUTS;
1052 #else
1053 return -1;
1054 #endif
1055
1056 case _SC_TYPED_MEMORY_OBJECTS:
1057 #if CONF_IS_DEFINED_SET (_POSIX_TYPED_MEMORY_OBJECTS)
1058 return _POSIX_TYPED_MEMORY_OBJECTS;
1059 #else
1060 return -1;
1061 #endif
1062
1063 case _SC_USER_GROUPS:
1064 #if CONF_IS_DEFINED_SET (_POSIX_USER_GROUPS)
1065 return _POSIX_USER_GROUPS;
1066 #else
1067 return -1;
1068 #endif
1069 case _SC_USER_GROUPS_R:
1070 #if CONF_IS_DEFINED_SET (_POSIX_USER_GROUPS_R)
1071 return _POSIX_USER_GROUPS_R;
1072 #else
1073 return -1;
1074 #endif
1075
1076 case _SC_2_PBS:
1077 #ifdef _POSIX2_PBS
1078 return _POSIX2_PBS;
1079 #else
1080 return -1;
1081 #endif
1082 case _SC_2_PBS_ACCOUNTING:
1083 #ifdef _POSIX2_PBS_ACCOUNTING
1084 return _POSIX2_PBS_ACCOUNTING;
1085 #else
1086 return -1;
1087 #endif
1088 case _SC_2_PBS_CHECKPOINT:
1089 #ifdef _POSIX2_PBS_CHECKPOINT
1090 return _POSIX2_PBS_CHECKPOINT;
1091 #else
1092 return -1;
1093 #endif
1094 case _SC_2_PBS_LOCATE:
1095 #ifdef _POSIX2_PBS_LOCATE
1096 return _POSIX2_PBS_LOCATE;
1097 #else
1098 return -1;
1099 #endif
1100 case _SC_2_PBS_MESSAGE:
1101 #ifdef _POSIX2_PBS_MESSAGE
1102 return _POSIX2_PBS_MESSAGE;
1103 #else
1104 return -1;
1105 #endif
1106 case _SC_2_PBS_TRACK:
1107 #ifdef _POSIX2_PBS_TRACK
1108 return _POSIX2_PBS_TRACK;
1109 #else
1110 return -1;
1111 #endif
1112
1113 case _SC_SYMLOOP_MAX:
1114 #ifdef SYMLOOP_MAX
1115 return SYMLOOP_MAX;
1116 #else
1117 return -1;
1118 #endif
1119
1120 case _SC_STREAMS:
1121 return -1;
1122
1123 case _SC_HOST_NAME_MAX:
1124 #ifdef HOST_NAME_MAX
1125 return HOST_NAME_MAX;
1126 #else
1127 return -1;
1128 #endif
1129
1130 case _SC_TRACE:
1131 #if CONF_IS_DEFINED_SET (_POSIX_TRACE)
1132 return _POSIX_TRACE;
1133 #else
1134 return -1;
1135 #endif
1136 case _SC_TRACE_EVENT_FILTER:
1137 #if CONF_IS_DEFINED_SET (_POSIX_TRACE_EVENT_FILTER)
1138 return _POSIX_TRACE_EVENT_FILTER;
1139 #else
1140 return -1;
1141 #endif
1142 case _SC_TRACE_INHERIT:
1143 #if CONF_IS_DEFINED_SET (_POSIX_TRACE_INHERIT)
1144 return _POSIX_TRACE_INHERIT;
1145 #else
1146 return -1;
1147 #endif
1148 case _SC_TRACE_LOG:
1149 #if CONF_IS_DEFINED_SET (_POSIX_TRACE_LOG)
1150 return _POSIX_TRACE_LOG;
1151 #else
1152 return -1;
1153 #endif
1154
1155 case _SC_TRACE_EVENT_NAME_MAX:
1156 case _SC_TRACE_NAME_MAX:
1157 case _SC_TRACE_SYS_MAX:
1158 case _SC_TRACE_USER_EVENT_MAX:
1159 /* No support for tracing. */
1160
1161 case _SC_XOPEN_STREAMS:
1162 /* No support for STREAMS. */
1163 return -1;
1164
1165 case _SC_LEVEL1_ICACHE_SIZE:
1166 case _SC_LEVEL1_ICACHE_ASSOC:
1167 case _SC_LEVEL1_ICACHE_LINESIZE:
1168 case _SC_LEVEL1_DCACHE_SIZE:
1169 case _SC_LEVEL1_DCACHE_ASSOC:
1170 case _SC_LEVEL1_DCACHE_LINESIZE:
1171 case _SC_LEVEL2_CACHE_SIZE:
1172 case _SC_LEVEL2_CACHE_ASSOC:
1173 case _SC_LEVEL2_CACHE_LINESIZE:
1174 case _SC_LEVEL3_CACHE_SIZE:
1175 case _SC_LEVEL3_CACHE_ASSOC:
1176 case _SC_LEVEL3_CACHE_LINESIZE:
1177 case _SC_LEVEL4_CACHE_SIZE:
1178 case _SC_LEVEL4_CACHE_ASSOC:
1179 case _SC_LEVEL4_CACHE_LINESIZE:
1180 /* In general we cannot determine these values. Therefore we
1181 return zero which indicates that no information is
1182 available. */
1183 return 0;
1184
1185 case _SC_IPV6:
1186 #if CONF_IS_DEFINED_SET (_POSIX_IPV6)
1187 return _POSIX_IPV6;
1188 #else
1189 return -1;
1190 #endif
1191
1192 case _SC_RAW_SOCKETS:
1193 #if CONF_IS_DEFINED_SET (_POSIX_RAW_SOCKETS)
1194 return _POSIX_RAW_SOCKETS;
1195 #else
1196 return -1;
1197 #endif
1198
1199 case _SC_SIGSTKSZ:
1200 #ifdef SIGSTKSZ
1201 return SIGSTKSZ;
1202 #else
1203 return -1;
1204 #endif
1205
1206 case _SC_MINSIGSTKSZ:
1207 #ifdef MINSIGSTKSZ
1208 return MINSIGSTKSZ;
1209 #else
1210 return -1;
1211 #endif
1212 }
1213 }
1214
1215 #undef __sysconf
1216 weak_alias (__sysconf, sysconf)
1217 libc_hidden_def (__sysconf)
1218
1219 #if NEED_CHECK_SPEC
1220 static long int
1221 __sysconf_check_spec (const char *spec)
1222 {
1223 int save_errno = errno;
1224
1225 const char *getconf_dir = __libc_secure_getenv ("GETCONF_DIR") ?: GETCONF_DIR;
1226 size_t getconf_dirlen = strlen (getconf_dir);
1227 size_t speclen = strlen (spec);
1228
1229 char name[getconf_dirlen + sizeof ("/POSIX_V6_") + speclen];
1230 memcpy (mempcpy (mempcpy (name, getconf_dir, getconf_dirlen),
1231 "/POSIX_V6_", sizeof ("/POSIX_V6_") - 1),
1232 spec, speclen + 1);
1233
1234 struct __stat64_t64 st;
1235 long int ret = __stat64_time64 (name, &st) >= 0 ? 1 : -1;
1236
1237 __set_errno (save_errno);
1238 return ret;
1239 }
1240 #endif