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192.168.1.100 / T106_DC / f0c3c776fa213d408167daafd7d4ded1c97e1725 / . / ap / libc / glibc / glibc-2.23 / sysdeps / posix / sysconf.c
blob: 892f76d55c6e09f5a0358af4726945df289ee6cc [file] [log] [blame]
xf.libdd93d52023-05-12 07:10:14 -0700[diff] [blame]1/* Copyright (C) 1991-2016 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 <http://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 <regex.h>
33
34#define NEED_SPEC_ARRAY 0
35#include <posix-conf-vars.h>
36
37#define NEED_CHECK_SPEC \
38 (!defined _XBS5_ILP32_OFF32 || !defined _XBS5_ILP32_OFFBIG \
39 || !defined _XBS5_LP64_OFF64 || !defined _XBS5_LPBIG_OFFBIG \
40 || !defined _POSIX_V6_ILP32_OFF32 || !defined _POSIX_V6_ILP32_OFFBIG \
41 || !defined _POSIX_V6_LP64_OFF64 || !defined _POSIX_V6_LPBIG_OFFBIG \
42 || !defined _POSIX_V7_ILP32_OFF32 || !defined _POSIX_V7_ILP32_OFFBIG \
43 || !defined _POSIX_V7_LP64_OFF64 || !defined _POSIX_V7_LPBIG_OFFBIG)
44#if NEED_CHECK_SPEC
45static long int __sysconf_check_spec (const char *spec);
46#endif
47
48
49/* Get the value of the system variable NAME. */
50long int
51__sysconf (int name)
52{
53 switch (name)
54 {
55 /* Also add obsolete or unnecessarily added constants here. */
56 case _SC_EQUIV_CLASS_MAX:
57 default:
58 __set_errno (EINVAL);
59 return -1;
60
61 case _SC_ARG_MAX:
62#ifdef ARG_MAX
63 return ARG_MAX;
64#else
65 return -1;
66#endif
67
68 case _SC_CHILD_MAX:
69#ifdef CHILD_MAX
70 return CHILD_MAX;
71#else
72 return __get_child_max ();
73#endif
74
75 case _SC_CLK_TCK:
76 return __getclktck ();
77
78 case _SC_NGROUPS_MAX:
79#ifdef NGROUPS_MAX
80 return NGROUPS_MAX;
81#else
82 return -1;
83#endif
84
85 case _SC_OPEN_MAX:
86 return __getdtablesize ();
87
88 case _SC_STREAM_MAX:
89#ifdef STREAM_MAX
90 return STREAM_MAX;
91#else
92 return FOPEN_MAX;
93#endif
94
95 case _SC_TZNAME_MAX:
96 return MAX (__tzname_max (), _POSIX_TZNAME_MAX);
97
98 case _SC_JOB_CONTROL:
99#if CONF_IS_DEFINED_SET (_POSIX_JOB_CONTROL)
100 return _POSIX_JOB_CONTROL;
101#else
102 return -1;
103#endif
104
105 case _SC_SAVED_IDS:
106#if CONF_IS_DEFINED_SET (_POSIX_SAVED_IDS)
107 return 1;
108#else
109 return -1;
110#endif
111
112 case _SC_REALTIME_SIGNALS:
113#if CONF_IS_DEFINED_SET (_POSIX_REALTIME_SIGNALS)
114 return _POSIX_REALTIME_SIGNALS;
115#else
116 return -1;
117#endif
118
119 case _SC_PRIORITY_SCHEDULING:
120#if CONF_IS_DEFINED_SET (_POSIX_PRIORITY_SCHEDULING)
121 return _POSIX_PRIORITY_SCHEDULING;
122#else
123 return -1;
124#endif
125
126 case _SC_TIMERS:
127#if CONF_IS_DEFINED_SET (_POSIX_TIMERS)
128 return _POSIX_TIMERS;
129#else
130 return -1;
131#endif
132
133 case _SC_ASYNCHRONOUS_IO:
134#if CONF_IS_DEFINED_SET (_POSIX_ASYNCHRONOUS_IO)
135 return _POSIX_ASYNCHRONOUS_IO;
136#else
137 return -1;
138#endif
139
140 case _SC_PRIORITIZED_IO:
141#if CONF_IS_DEFINED_SET (_POSIX_PRIORITIZED_IO)
142 return _POSIX_PRIORITIZED_IO;
143#else
144 return -1;
145#endif
146
147 case _SC_SYNCHRONIZED_IO:
148#if CONF_IS_DEFINED_SET (_POSIX_SYNCHRONIZED_IO)
149 return _POSIX_SYNCHRONIZED_IO;
150#else
151 return -1;
152#endif
153
154 case _SC_FSYNC:
155#if CONF_IS_DEFINED_SET (_POSIX_FSYNC)
156 return _POSIX_FSYNC;
157#else
158 return -1;
159#endif
160
161 case _SC_MAPPED_FILES:
162#if CONF_IS_DEFINED_SET (_POSIX_MAPPED_FILES)
163 return _POSIX_MAPPED_FILES;
164#else
165 return -1;
166#endif
167
168 case _SC_MEMLOCK:
169#if CONF_IS_DEFINED_SET (_POSIX_MEMLOCK)
170 return _POSIX_MEMLOCK;
171#else
172 return -1;
173#endif
174
175 case _SC_MEMLOCK_RANGE:
176#if CONF_IS_DEFINED_SET (_POSIX_MEMLOCK_RANGE)
177 return _POSIX_MEMLOCK_RANGE;
178#else
179 return -1;
180#endif
181
182 case _SC_MEMORY_PROTECTION:
183#if CONF_IS_DEFINED_SET (_POSIX_MEMORY_PROTECTION)
184 return _POSIX_MEMORY_PROTECTION;
185#else
186 return -1;
187#endif
188
189 case _SC_MESSAGE_PASSING:
190#if CONF_IS_DEFINED_SET (_POSIX_MESSAGE_PASSING)
191 return _POSIX_MESSAGE_PASSING;
192#else
193 return -1;
194#endif
195
196 case _SC_SEMAPHORES:
197#if CONF_IS_DEFINED_SET (_POSIX_SEMAPHORES)
198 return _POSIX_SEMAPHORES;
199#else
200 return -1;
201#endif
202
203 case _SC_SHARED_MEMORY_OBJECTS:
204#if CONF_IS_DEFINED_SET (_POSIX_SHARED_MEMORY_OBJECTS)
205 return _POSIX_SHARED_MEMORY_OBJECTS;
206#else
207 return -1;
208#endif
209
210 case _SC_VERSION:
211 return _POSIX_VERSION;
212
213 case _SC_PAGESIZE:
214 return __getpagesize ();
215
216 case _SC_AIO_LISTIO_MAX:
217#ifdef AIO_LISTIO_MAX
218 return AIO_LISTIO_MAX;
219#else
220 return -1;
221#endif
222
223 case _SC_AIO_MAX:
224#ifdef AIO_MAX
225 return AIO_MAX;
226#else
227 return -1;
228#endif
229
230 case _SC_AIO_PRIO_DELTA_MAX:
231#ifdef AIO_PRIO_DELTA_MAX
232 return AIO_PRIO_DELTA_MAX;
233#else
234 return -1;
235#endif
236
237 case _SC_DELAYTIMER_MAX:
238#ifdef DELAYTIMER_MAX
239 return DELAYTIMER_MAX;
240#else
241 return -1;
242#endif
243
244 case _SC_MQ_OPEN_MAX:
245#ifdef MQ_OPEN_MAX
246 return MQ_OPEN_MAX;
247#else
248 return -1;
249#endif
250
251 case _SC_MQ_PRIO_MAX:
252#ifdef MQ_PRIO_MAX
253 return MQ_PRIO_MAX;
254#else
255 return -1;
256#endif
257
258 case _SC_RTSIG_MAX:
259#ifdef RTSIG_MAX
260 return RTSIG_MAX;
261#else
262 return -1;
263#endif
264
265 case _SC_SEM_NSEMS_MAX:
266#ifdef SEM_NSEMS_MAX
267 return SEM_NSEMS_MAX;
268#else
269 return -1;
270#endif
271
272 case _SC_SEM_VALUE_MAX:
273#ifdef SEM_VALUE_MAX
274 return SEM_VALUE_MAX;
275#else
276 return -1;
277#endif
278
279 case _SC_SIGQUEUE_MAX:
280#ifdef SIGQUEUE_MAX
281 return SIGQUEUE_MAX;
282#else
283 return -1;
284#endif
285
286 case _SC_TIMER_MAX:
287#ifdef TIMER_MAX
288 return TIMER_MAX;
289#else
290 return -1;
291#endif
292
293 case _SC_BC_BASE_MAX:
294#ifdef BC_BASE_MAX
295 return BC_BASE_MAX;
296#else
297 return -1;
298#endif
299
300 case _SC_BC_DIM_MAX:
301#ifdef BC_DIM_MAX
302 return BC_DIM_MAX;
303#else
304 return -1;
305#endif
306
307 case _SC_BC_SCALE_MAX:
308#ifdef BC_SCALE_MAX
309 return BC_SCALE_MAX;
310#else
311 return -1;
312#endif
313
314 case _SC_BC_STRING_MAX:
315#ifdef BC_STRING_MAX
316 return BC_STRING_MAX;
317#else
318 return -1;
319#endif
320
321 case _SC_COLL_WEIGHTS_MAX:
322#ifdef COLL_WEIGHTS_MAX
323 return COLL_WEIGHTS_MAX;
324#else
325 return -1;
326#endif
327
328 case _SC_EXPR_NEST_MAX:
329#ifdef EXPR_NEST_MAX
330 return EXPR_NEST_MAX;
331#else
332 return -1;
333#endif
334
335 case _SC_LINE_MAX:
336#ifdef LINE_MAX
337 return LINE_MAX;
338#else
339 return -1;
340#endif
341
342 case _SC_RE_DUP_MAX:
343#ifdef RE_DUP_MAX
344 return RE_DUP_MAX;
345#else
346 return -1;
347#endif
348
349 case _SC_CHARCLASS_NAME_MAX:
350#ifdef CHARCLASS_NAME_MAX
351 return CHARCLASS_NAME_MAX;
352#else
353 return -1;
354#endif
355
356 case _SC_PII:
357#if CONF_IS_DEFINED_SET (_POSIX_PII)
358 return 1;
359#else
360 return -1;
361#endif
362
363 case _SC_PII_XTI:
364#if CONF_IS_DEFINED_SET (_POSIX_PII_XTI)
365 return 1;
366#else
367 return -1;
368#endif
369
370 case _SC_PII_SOCKET:
371#if CONF_IS_DEFINED_SET (_POSIX_PII_SOCKET)
372 return 1;
373#else
374 return -1;
375#endif
376
377 case _SC_PII_INTERNET:
378#if CONF_IS_DEFINED_SET (_POSIX_PII_INTERNET)
379 return 1;
380#else
381 return -1;
382#endif
383
384 case _SC_PII_OSI:
385#if CONF_IS_DEFINED_SET (_POSIX_PII_OSI)
386 return 1;
387#else
388 return -1;
389#endif
390
391 case _SC_POLL:
392#if CONF_IS_DEFINED_SET (_POSIX_POLL)
393 return 1;
394#else
395 return -1;
396#endif
397
398 case _SC_SELECT:
399#if CONF_IS_DEFINED_SET (_POSIX_SELECT)
400 return 1;
401#else
402 return -1;
403#endif
404
405 /* The same as _SC_IOV_MAX. */
406 case _SC_UIO_MAXIOV:
407#ifdef UIO_MAXIOV
408 return UIO_MAXIOV;
409#else
410 return -1;
411#endif
412
413 case _SC_PII_INTERNET_STREAM:
414#if CONF_IS_DEFINED_SET (_POSIX_PII_INTERNET_STREAM)
415 return 1;
416#else
417 return -1;
418#endif
419
420 case _SC_PII_INTERNET_DGRAM:
421#if CONF_IS_DEFINED_SET (_POSIX_PII_INTERNET_DGRAM)
422 return 1;
423#else
424 return -1;
425#endif
426
427 case _SC_PII_OSI_COTS:
428#if CONF_IS_DEFINED_SET (_POSIX_PII_OSI_COTS)
429 return 1;
430#else
431 return -1;
432#endif
433
434 case _SC_PII_OSI_CLTS:
435#if CONF_IS_DEFINED_SET (_POSIX_PII_OSI_CLTS)
436 return 1;
437#else
438 return -1;
439#endif
440
441 case _SC_PII_OSI_M:
442#if CONF_IS_DEFINED_SET (_POSIX_PII_OSI_M)
443 return 1;
444#else
445 return -1;
446#endif
447
448 case _SC_T_IOV_MAX:
449#ifdef _T_IOV_MAX
450 return _T_IOV_MAX;
451#else
452 return -1;
453#endif
454
455 case _SC_2_VERSION:
456 return _POSIX2_VERSION;
457
458 case _SC_2_C_BIND:
459#ifdef _POSIX2_C_BIND
460 return _POSIX2_C_BIND;
461#else
462 return -1;
463#endif
464
465 case _SC_2_C_DEV:
466#ifdef _POSIX2_C_DEV
467 return _POSIX2_C_DEV;
468#else
469 return -1;
470#endif
471
472 case _SC_2_C_VERSION:
473#ifdef _POSIX2_C_VERSION
474 return _POSIX2_C_VERSION;
475#else
476 return -1;
477#endif
478
479 case _SC_2_FORT_DEV:
480#ifdef _POSIX2_FORT_DEV
481 return _POSIX2_FORT_DEV;
482#else
483 return -1;
484#endif
485
486 case _SC_2_FORT_RUN:
487#ifdef _POSIX2_FORT_RUN
488 return _POSIX2_FORT_RUN;
489#else
490 return -1;
491#endif
492
493 case _SC_2_LOCALEDEF:
494#ifdef _POSIX2_LOCALEDEF
495 return _POSIX2_LOCALEDEF;
496#else
497 return -1;
498#endif
499
500 case _SC_2_SW_DEV:
501#ifdef _POSIX2_SW_DEV
502 return _POSIX2_SW_DEV;
503#else
504 return -1;
505#endif
506
507 case _SC_2_CHAR_TERM:
508#ifdef _POSIX2_CHAR_TERM
509 return _POSIX2_CHAR_TERM;
510#else
511 return -1;
512#endif
513
514 case _SC_2_UPE:
515#ifdef _POSIX2_UPE
516 return _POSIX2_UPE;
517#else
518 return -1;
519#endif
520
521 /* POSIX 1003.1c (POSIX Threads). */
522 case _SC_THREADS:
523#if CONF_IS_DEFINED_SET (_POSIX_THREADS)
524 return _POSIX_THREADS;
525#else
526 return -1;
527#endif
528
529 case _SC_THREAD_SAFE_FUNCTIONS:
530#if CONF_IS_DEFINED_SET (_POSIX_THREAD_SAFE_FUNCTIONS)
531 return _POSIX_THREAD_SAFE_FUNCTIONS;
532#else
533 return -1;
534#endif
535
536 case _SC_GETGR_R_SIZE_MAX:
537 return NSS_BUFLEN_GROUP;
538
539 case _SC_GETPW_R_SIZE_MAX:
540 return NSS_BUFLEN_PASSWD;
541
542 case _SC_LOGIN_NAME_MAX:
543#ifdef LOGIN_NAME_MAX
544 return LOGIN_NAME_MAX;
545#else
546 return -1;
547#endif
548
549 case _SC_TTY_NAME_MAX:
550#ifdef TTY_NAME_MAX
551 return TTY_NAME_MAX;
552#else
553 return -1;
554#endif
555
556 case _SC_THREAD_DESTRUCTOR_ITERATIONS:
557#if CONF_IS_DEFINED_SET (_POSIX_THREAD_DESTRUCTOR_ITERATIONS)
558 return _POSIX_THREAD_DESTRUCTOR_ITERATIONS;
559#else
560 return -1;
561#endif
562
563 case _SC_THREAD_KEYS_MAX:
564#ifdef PTHREAD_KEYS_MAX
565 return PTHREAD_KEYS_MAX;
566#else
567 return -1;
568#endif
569
570 case _SC_THREAD_STACK_MIN:
571#ifdef PTHREAD_STACK_MIN
572 return PTHREAD_STACK_MIN;
573#else
574 return -1;
575#endif
576
577 case _SC_THREAD_THREADS_MAX:
578#ifdef PTHREAD_THREADS_MAX
579 return PTHREAD_THREADS_MAX;
580#else
581 return -1;
582#endif
583
584 case _SC_THREAD_ATTR_STACKADDR:
585#if CONF_IS_DEFINED_SET (_POSIX_THREAD_ATTR_STACKADDR)
586 return _POSIX_THREAD_ATTR_STACKADDR;
587#else
588 return -1;
589#endif
590
591 case _SC_THREAD_ATTR_STACKSIZE:
592#if CONF_IS_DEFINED_SET (_POSIX_THREAD_ATTR_STACKSIZE)
593 return _POSIX_THREAD_ATTR_STACKSIZE;
594#else
595 return -1;
596#endif
597
598 case _SC_THREAD_PRIORITY_SCHEDULING:
599#if CONF_IS_DEFINED_SET (_POSIX_THREAD_PRIORITY_SCHEDULING)
600 return _POSIX_THREAD_PRIORITY_SCHEDULING;
601#else
602 return -1;
603#endif
604
605 case _SC_THREAD_PRIO_INHERIT:
606#if CONF_IS_DEFINED_SET (_POSIX_THREAD_PRIO_INHERIT)
607 return _POSIX_THREAD_PRIO_INHERIT;
608#else
609 return -1;
610#endif
611
612 case _SC_THREAD_PRIO_PROTECT:
613#if CONF_IS_DEFINED_SET (_POSIX_THREAD_PRIO_PROTECT)
614 return _POSIX_THREAD_PRIO_PROTECT;
615#else
616 return -1;
617#endif
618
619 case _SC_THREAD_PROCESS_SHARED:
620#if CONF_IS_DEFINED_SET (_POSIX_THREAD_PROCESS_SHARED)
621 return _POSIX_THREAD_PROCESS_SHARED;
622#else
623 return -1;
624#endif
625
626 case _SC_NPROCESSORS_CONF:
627 return __get_nprocs_conf ();
628
629 case _SC_NPROCESSORS_ONLN:
630 return __get_nprocs ();
631
632 case _SC_PHYS_PAGES:
633 return __get_phys_pages ();
634
635 case _SC_AVPHYS_PAGES:
636 return __get_avphys_pages ();
637
638 case _SC_ATEXIT_MAX:
639 /* We have no limit since we use lists. */
640 return INT_MAX;
641
642 case _SC_PASS_MAX:
643 /* We have no limit but since the return value might be used to
644 allocate a buffer we restrict the value. */
645 return BUFSIZ;
646
647 case _SC_XOPEN_VERSION:
648 return _XOPEN_VERSION;
649
650 case _SC_XOPEN_XCU_VERSION:
651 return _XOPEN_XCU_VERSION;
652
653 case _SC_XOPEN_UNIX:
654 return _XOPEN_UNIX;
655
656 case _SC_XOPEN_CRYPT:
657#ifdef _XOPEN_CRYPT
658 return _XOPEN_CRYPT;
659#else
660 return -1;
661#endif
662
663 case _SC_XOPEN_ENH_I18N:
664#ifdef _XOPEN_ENH_I18N
665 return _XOPEN_ENH_I18N;
666#else
667 return -1;
668#endif
669
670 case _SC_XOPEN_SHM:
671#ifdef _XOPEN_SHM
672 return _XOPEN_SHM;
673#else
674 return -1;
675#endif
676
677 case _SC_XOPEN_XPG2:
678#ifdef _XOPEN_XPG2
679 return _XOPEN_XPG2;
680#else
681 return -1;
682#endif
683
684 case _SC_XOPEN_XPG3:
685#ifdef _XOPEN_XPG3
686 return _XOPEN_XPG3;
687#else
688 return -1;
689#endif
690
691 case _SC_XOPEN_XPG4:
692#ifdef _XOPEN_XPG4
693 return _XOPEN_XPG4;
694#else
695 return -1;
696#endif
697
698 case _SC_CHAR_BIT:
699 return CHAR_BIT;
700
701 case _SC_CHAR_MAX:
702 return CHAR_MAX;
703
704 case _SC_CHAR_MIN:
705 return CHAR_MIN;
706
707 case _SC_INT_MAX:
708 return INT_MAX;
709
710 case _SC_INT_MIN:
711 return INT_MIN;
712
713 case _SC_LONG_BIT:
714 return sizeof (long int) * CHAR_BIT;
715
716 case _SC_WORD_BIT:
717 return sizeof (int) * CHAR_BIT;
718
719 case _SC_MB_LEN_MAX:
720 return MB_LEN_MAX;
721
722 case _SC_NZERO:
723 return NZERO;
724
725 case _SC_SSIZE_MAX:
726 return _POSIX_SSIZE_MAX;
727
728 case _SC_SCHAR_MAX:
729 return SCHAR_MAX;
730
731 case _SC_SCHAR_MIN:
732 return SCHAR_MIN;
733
734 case _SC_SHRT_MAX:
735 return SHRT_MAX;
736
737 case _SC_SHRT_MIN:
738 return SHRT_MIN;
739
740 case _SC_UCHAR_MAX:
741 return UCHAR_MAX;
742
743 case _SC_UINT_MAX:
744 return UINT_MAX;
745
746 case _SC_ULONG_MAX:
747 return ULONG_MAX;
748
749 case _SC_USHRT_MAX:
750 return USHRT_MAX;
751
752 case _SC_NL_ARGMAX:
753#ifdef NL_ARGMAX
754 return NL_ARGMAX;
755#else
756 return -1;
757#endif
758
759 case _SC_NL_LANGMAX:
760#ifdef NL_LANGMAX
761 return NL_LANGMAX;
762#else
763 return -1;
764#endif
765
766 case _SC_NL_MSGMAX:
767#ifdef NL_MSGMAX
768 return NL_MSGMAX;
769#else
770 return -1;
771#endif
772
773 case _SC_NL_NMAX:
774#ifdef NL_NMAX
775 return NL_NMAX;
776#else
777 return -1;
778#endif
779
780 case _SC_NL_SETMAX:
781#ifdef NL_SETMAX
782 return NL_SETMAX;
783#else
784 return -1;
785#endif
786
787 case _SC_NL_TEXTMAX:
788#ifdef NL_TEXTMAX
789 return NL_TEXTMAX;
790#else
791 return -1;
792#endif
793
794#define START_ENV_GROUP(VERSION) \
795 /* Empty. */
796
797#define END_ENV_GROUP(VERSION) \
798 /* Empty. */
799
800#define KNOWN_ABSENT_ENVIRONMENT(SC_PREFIX, ENV_PREFIX, SUFFIX) \
801 case _SC_##SC_PREFIX##_##SUFFIX: \
802 return _##ENV_PREFIX##_##SUFFIX;
803
804#define KNOWN_PRESENT_ENVIRONMENT(SC_PREFIX, ENV_PREFIX, SUFFIX) \
805 case _SC_##SC_PREFIX##_##SUFFIX: \
806 return _##ENV_PREFIX##_##SUFFIX;
807
808#define UNKNOWN_ENVIRONMENT(SC_PREFIX, ENV_PREFIX, SUFFIX) \
809 case _SC_##SC_PREFIX##_##SUFFIX: \
810 return __sysconf_check_spec (#SUFFIX);
811
812#include <posix/posix-envs.def>
813
814#undef START_ENV_GROUP
815#undef END_ENV_GROUP
816#undef KNOWN_ABSENT_ENVIRONMENT
817#undef KNOWN_PRESENT_ENVIRONMENT
818#undef UNKNOWN_ENVIRONMENT
819
820 case _SC_XOPEN_LEGACY:
821 return _XOPEN_LEGACY;
822
823 case _SC_XOPEN_REALTIME:
824#ifdef _XOPEN_REALTIME
825 return _XOPEN_REALTIME;
826#else
827 return -1;
828#endif
829 case _SC_XOPEN_REALTIME_THREADS:
830#ifdef _XOPEN_REALTIME_THREADS
831 return _XOPEN_REALTIME_THREADS;
832#else
833 return -1;
834#endif
835
836 case _SC_ADVISORY_INFO:
837#if CONF_IS_DEFINED_SET (_POSIX_ADVISORY_INFO)
838 return _POSIX_ADVISORY_INFO;
839#else
840 return -1;
841#endif
842
843 case _SC_BARRIERS:
844#if CONF_IS_DEFINED_SET (_POSIX_BARRIERS)
845 return _POSIX_BARRIERS;
846#else
847 return -1;
848#endif
849
850 case _SC_BASE:
851#if CONF_IS_DEFINED_SET (_POSIX_BASE)
852 return _POSIX_BASE;
853#else
854 return -1;
855#endif
856 case _SC_C_LANG_SUPPORT:
857#if CONF_IS_DEFINED_SET (_POSIX_C_LANG_SUPPORT)
858 return _POSIX_C_LANG_SUPPORT;
859#else
860 return -1;
861#endif
862 case _SC_C_LANG_SUPPORT_R:
863#if CONF_IS_DEFINED_SET (_POSIX_C_LANG_SUPPORT_R)
864 return _POSIX_C_LANG_SUPPORT_R;
865#else
866 return -1;
867#endif
868
869 case _SC_CLOCK_SELECTION:
870#if CONF_IS_DEFINED_SET (_POSIX_CLOCK_SELECTION)
871 return _POSIX_CLOCK_SELECTION;
872#else
873 return -1;
874#endif
875
876 case _SC_CPUTIME:
877#if CONF_IS_DEFINED_SET (_POSIX_CPUTIME)
878 return _POSIX_CPUTIME;
879#else
880 return -1;
881#endif
882
883 case _SC_DEVICE_IO:
884#if CONF_IS_DEFINED_SET (_POSIX_DEVICE_IO)
885 return _POSIX_DEVICE_IO;
886#else
887 return -1;
888#endif
889 case _SC_DEVICE_SPECIFIC:
890#if CONF_IS_DEFINED_SET (_POSIX_DEVICE_SPECIFIC)
891 return _POSIX_DEVICE_SPECIFIC;
892#else
893 return -1;
894#endif
895 case _SC_DEVICE_SPECIFIC_R:
896#if CONF_IS_DEFINED_SET (_POSIX_DEVICE_SPECIFIC_R)
897 return _POSIX_DEVICE_SPECIFIC_R;
898#else
899 return -1;
900#endif
901
902 case _SC_FD_MGMT:
903#if CONF_IS_DEFINED_SET (_POSIX_FD_MGMT)
904 return _POSIX_FD_MGMT;
905#else
906 return -1;
907#endif
908
909 case _SC_FIFO:
910#if CONF_IS_DEFINED_SET (_POSIX_FIFO)
911 return _POSIX_FIFO;
912#else
913 return -1;
914#endif
915 case _SC_PIPE:
916#if CONF_IS_DEFINED_SET (_POSIX_PIPE)
917 return _POSIX_PIPE;
918#else
919 return -1;
920#endif
921
922 case _SC_FILE_ATTRIBUTES:
923#if CONF_IS_DEFINED_SET (_POSIX_FILE_ATTRIBUTES)
924 return _POSIX_FILE_ATTRIBUTES;
925#else
926 return -1;
927#endif
928 case _SC_FILE_LOCKING:
929#if CONF_IS_DEFINED_SET (_POSIX_FILE_LOCKING)
930 return _POSIX_FILE_LOCKING;
931#else
932 return -1;
933#endif
934 case _SC_FILE_SYSTEM:
935#if CONF_IS_DEFINED_SET (_POSIX_FILE_SYSTEM)
936 return _POSIX_FILE_SYSTEM;
937#else
938 return -1;
939#endif
940
941 case _SC_MONOTONIC_CLOCK:
942#if CONF_IS_DEFINED_SET (_POSIX_MONOTONIC_CLOCK)
943 return _POSIX_MONOTONIC_CLOCK;
944#else
945 return -1;
946#endif
947
948 case _SC_MULTI_PROCESS:
949#if CONF_IS_DEFINED_SET (_POSIX_MULTI_PROCESS)
950 return _POSIX_MULTI_PROCESS;
951#else
952 return -1;
953#endif
954 case _SC_SINGLE_PROCESS:
955#if CONF_IS_DEFINED_SET (_POSIX_SINGLE_PROCESS)
956 return _POSIX_SINGLE_PROCESS;
957#else
958 return -1;
959#endif
960
961 case _SC_NETWORKING:
962#if CONF_IS_DEFINED_SET (_POSIX_NETWORKING)
963 return _POSIX_NETWORKING;
964#else
965 return -1;
966#endif
967
968 case _SC_READER_WRITER_LOCKS:
969#if CONF_IS_DEFINED_SET (_POSIX_READER_WRITER_LOCKS)
970 return _POSIX_READER_WRITER_LOCKS;
971#else
972 return -1;
973#endif
974 case _SC_SPIN_LOCKS:
975#if CONF_IS_DEFINED_SET (_POSIX_SPIN_LOCKS)
976 return _POSIX_SPIN_LOCKS;
977#else
978 return -1;
979#endif
980
981 case _SC_REGEXP:
982#if CONF_IS_DEFINED_SET (_POSIX_REGEXP)
983 return _POSIX_REGEXP;
984#else
985 return -1;
986#endif
987 /* _REGEX_VERSION has been removed with IEEE Std 1003.1-2001/Cor 2-2004,
988 item XSH/TC2/D6/137. */
989 case _SC_REGEX_VERSION:
990 return -1;
991
992 case _SC_SHELL:
993#if CONF_IS_DEFINED_SET (_POSIX_SHELL)
994 return _POSIX_SHELL;
995#else
996 return -1;
997#endif
998
999 case _SC_SIGNALS:
1000#if CONF_IS_DEFINED (_POSIX_SIGNALS)
1001 return _POSIX_SIGNALS;
1002#else
1003 return -1;
1004#endif
1005
1006 case _SC_SPAWN:
1007#if CONF_IS_DEFINED_SET (_POSIX_SPAWN)
1008 return _POSIX_SPAWN;
1009#else
1010 return -1;
1011#endif
1012
1013 case _SC_SPORADIC_SERVER:
1014#if CONF_IS_DEFINED_SET (_POSIX_SPORADIC_SERVER)
1015 return _POSIX_SPORADIC_SERVER;
1016#else
1017 return -1;
1018#endif
1019 case _SC_THREAD_SPORADIC_SERVER:
1020#if CONF_IS_DEFINED_SET (_POSIX_THREAD_SPORADIC_SERVER)
1021 return _POSIX_THREAD_SPORADIC_SERVER;
1022#else
1023 return -1;
1024#endif
1025
1026 case _SC_SYSTEM_DATABASE:
1027#if CONF_IS_DEFINED_SET (_POSIX_SYSTEM_DATABASE)
1028 return _POSIX_SYSTEM_DATABASE;
1029#else
1030 return -1;
1031#endif
1032 case _SC_SYSTEM_DATABASE_R:
1033#if CONF_IS_DEFINED_SET (_POSIX_SYSTEM_DATABASE_R)
1034 return _POSIX_SYSTEM_DATABASE_R;
1035#else
1036 return -1;
1037#endif
1038
1039 case _SC_THREAD_CPUTIME:
1040#if CONF_IS_DEFINED_SET (_POSIX_THREAD_CPUTIME)
1041 return _POSIX_THREAD_CPUTIME;
1042#else
1043 return -1;
1044#endif
1045
1046 case _SC_TIMEOUTS:
1047#if CONF_IS_DEFINED_SET (_POSIX_TIMEOUTS)
1048 return _POSIX_TIMEOUTS;
1049#else
1050 return -1;
1051#endif
1052
1053 case _SC_TYPED_MEMORY_OBJECTS:
1054#if CONF_IS_DEFINED_SET (_POSIX_TYPED_MEMORY_OBJECTS)
1055 return _POSIX_TYPED_MEMORY_OBJECTS;
1056#else
1057 return -1;
1058#endif
1059
1060 case _SC_USER_GROUPS:
1061#if CONF_IS_DEFINED_SET (_POSIX_USER_GROUPS)
1062 return _POSIX_USER_GROUPS;
1063#else
1064 return -1;
1065#endif
1066 case _SC_USER_GROUPS_R:
1067#if CONF_IS_DEFINED_SET (_POSIX_USER_GROUPS_R)
1068 return _POSIX_USER_GROUPS_R;
1069#else
1070 return -1;
1071#endif
1072
1073 case _SC_2_PBS:
1074#ifdef _POSIX2_PBS
1075 return _POSIX2_PBS;
1076#else
1077 return -1;
1078#endif
1079 case _SC_2_PBS_ACCOUNTING:
1080#ifdef _POSIX2_PBS_ACCOUNTING
1081 return _POSIX2_PBS_ACCOUNTING;
1082#else
1083 return -1;
1084#endif
1085 case _SC_2_PBS_CHECKPOINT:
1086#ifdef _POSIX2_PBS_CHECKPOINT
1087 return _POSIX2_PBS_CHECKPOINT;
1088#else
1089 return -1;
1090#endif
1091 case _SC_2_PBS_LOCATE:
1092#ifdef _POSIX2_PBS_LOCATE
1093 return _POSIX2_PBS_LOCATE;
1094#else
1095 return -1;
1096#endif
1097 case _SC_2_PBS_MESSAGE:
1098#ifdef _POSIX2_PBS_MESSAGE
1099 return _POSIX2_PBS_MESSAGE;
1100#else
1101 return -1;
1102#endif
1103 case _SC_2_PBS_TRACK:
1104#ifdef _POSIX2_PBS_TRACK
1105 return _POSIX2_PBS_TRACK;
1106#else
1107 return -1;
1108#endif
1109
1110 case _SC_SYMLOOP_MAX:
1111#ifdef SYMLOOP_MAX
1112 return SYMLOOP_MAX;
1113#else
1114 return -1;
1115#endif
1116
1117 case _SC_STREAMS:
1118#ifdef _XOPEN_STREAMS
1119 return _XOPEN_STREAMS;
1120#else
1121 return -1;
1122#endif
1123
1124 case _SC_HOST_NAME_MAX:
1125#ifdef HOST_NAME_MAX
1126 return HOST_NAME_MAX;
1127#else
1128 return -1;
1129#endif
1130
1131 case _SC_TRACE:
1132#if CONF_IS_DEFINED_SET (_POSIX_TRACE)
1133 return _POSIX_TRACE;
1134#else
1135 return -1;
1136#endif
1137 case _SC_TRACE_EVENT_FILTER:
1138#if CONF_IS_DEFINED_SET (_POSIX_TRACE_EVENT_FILTER)
1139 return _POSIX_TRACE_EVENT_FILTER;
1140#else
1141 return -1;
1142#endif
1143 case _SC_TRACE_INHERIT:
1144#if CONF_IS_DEFINED_SET (_POSIX_TRACE_INHERIT)
1145 return _POSIX_TRACE_INHERIT;
1146#else
1147 return -1;
1148#endif
1149 case _SC_TRACE_LOG:
1150#if CONF_IS_DEFINED_SET (_POSIX_TRACE_LOG)
1151 return _POSIX_TRACE_LOG;
1152#else
1153 return -1;
1154#endif
1155
1156 case _SC_TRACE_EVENT_NAME_MAX:
1157 case _SC_TRACE_NAME_MAX:
1158 case _SC_TRACE_SYS_MAX:
1159 case _SC_TRACE_USER_EVENT_MAX:
1160 /* No support for tracing. */
1161
1162 case _SC_XOPEN_STREAMS:
1163 /* No support for STREAMS. */
1164 return -1;
1165
1166 case _SC_LEVEL1_ICACHE_SIZE:
1167 case _SC_LEVEL1_ICACHE_ASSOC:
1168 case _SC_LEVEL1_ICACHE_LINESIZE:
1169 case _SC_LEVEL1_DCACHE_SIZE:
1170 case _SC_LEVEL1_DCACHE_ASSOC:
1171 case _SC_LEVEL1_DCACHE_LINESIZE:
1172 case _SC_LEVEL2_CACHE_SIZE:
1173 case _SC_LEVEL2_CACHE_ASSOC:
1174 case _SC_LEVEL2_CACHE_LINESIZE:
1175 case _SC_LEVEL3_CACHE_SIZE:
1176 case _SC_LEVEL3_CACHE_ASSOC:
1177 case _SC_LEVEL3_CACHE_LINESIZE:
1178 case _SC_LEVEL4_CACHE_SIZE:
1179 case _SC_LEVEL4_CACHE_ASSOC:
1180 case _SC_LEVEL4_CACHE_LINESIZE:
1181 /* In general we cannot determine these values. Therefore we
1182 return zero which indicates that no information is
1183 available. */
1184 return 0;
1185
1186 case _SC_IPV6:
1187#if CONF_IS_DEFINED_SET (_POSIX_IPV6)
1188 return _POSIX_IPV6;
1189#else
1190 return -1;
1191#endif
1192
1193 case _SC_RAW_SOCKETS:
1194#if CONF_IS_DEFINED_SET (_POSIX_RAW_SOCKETS)
1195 return _POSIX_RAW_SOCKETS;
1196#else
1197 return -1;
1198#endif
1199 }
1200}
1201
1202#undef __sysconf
1203weak_alias (__sysconf, sysconf)
1204libc_hidden_def (__sysconf)
1205
1206#if NEED_CHECK_SPEC
1207static long int
1208__sysconf_check_spec (const char *spec)
1209{
1210 int save_errno = errno;
1211
1212 const char *getconf_dir = __libc_secure_getenv ("GETCONF_DIR") ?: GETCONF_DIR;
1213 size_t getconf_dirlen = strlen (getconf_dir);
1214 size_t speclen = strlen (spec);
1215
1216 char name[getconf_dirlen + sizeof ("/POSIX_V6_") + speclen];
1217 memcpy (mempcpy (mempcpy (name, getconf_dir, getconf_dirlen),
1218 "/POSIX_V6_", sizeof ("/POSIX_V6_") - 1),
1219 spec, speclen + 1);
1220
1221 struct stat64 st;
1222 long int ret = __xstat64 (_STAT_VER, name, &st) >= 0 ? 1 : -1;
1223
1224 __set_errno (save_errno);
1225 return ret;
1226}
1227#endif