1/* Copyright (C) 1991-2019 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 <sys/uio.h>
33#include <regex.h>
34
35#define NEED_SPEC_ARRAY 0
36#include <posix-conf-vars.h>
37
38#define NEED_CHECK_SPEC \
39 (!defined _XBS5_ILP32_OFF32 || !defined _XBS5_ILP32_OFFBIG \
40 || !defined _XBS5_LP64_OFF64 || !defined _XBS5_LPBIG_OFFBIG \
41 || !defined _POSIX_V6_ILP32_OFF32 || !defined _POSIX_V6_ILP32_OFFBIG \
42 || !defined _POSIX_V6_LP64_OFF64 || !defined _POSIX_V6_LPBIG_OFFBIG \
43 || !defined _POSIX_V7_ILP32_OFF32 || !defined _POSIX_V7_ILP32_OFFBIG \
44 || !defined _POSIX_V7_LP64_OFF64 || !defined _POSIX_V7_LPBIG_OFFBIG)
45#if NEED_CHECK_SPEC
46static long int __sysconf_check_spec (const char *spec);
47#endif
48
49
50/* Get the value of the system variable NAME. */
51long int
52__sysconf (int name)
53{
54 switch (name)
55 {
56 /* Also add obsolete or unnecessarily added constants here. */
57 case _SC_EQUIV_CLASS_MAX:
58 default:
59 __set_errno (EINVAL);
60 return -1;
61
62 case _SC_ARG_MAX:
63#ifdef ARG_MAX
64 return ARG_MAX;
65#else
66 return -1;
67#endif
68
69 case _SC_CHILD_MAX:
70#ifdef CHILD_MAX
71 return CHILD_MAX;
72#else
73 return __get_child_max ();
74#endif
75
76 case _SC_CLK_TCK:
77 return __getclktck ();
78
79 case _SC_NGROUPS_MAX:
80#ifdef NGROUPS_MAX
81 return NGROUPS_MAX;
82#else
83 return -1;
84#endif
85
86 case _SC_OPEN_MAX:
87 return __getdtablesize ();
88
89 case _SC_STREAM_MAX:
90#ifdef STREAM_MAX
91 return STREAM_MAX;
92#else
93 return FOPEN_MAX;
94#endif
95
96 case _SC_TZNAME_MAX:
97 return -1;
98
99 case _SC_JOB_CONTROL:
100#if CONF_IS_DEFINED_SET (_POSIX_JOB_CONTROL)
101 return _POSIX_JOB_CONTROL;
102#else
103 return -1;
104#endif
105
106 case _SC_SAVED_IDS:
107#if CONF_IS_DEFINED_SET (_POSIX_SAVED_IDS)
108 return 1;
109#else
110 return -1;
111#endif
112
113 case _SC_REALTIME_SIGNALS:
114#if CONF_IS_DEFINED_SET (_POSIX_REALTIME_SIGNALS)
115 return _POSIX_REALTIME_SIGNALS;
116#else
117 return -1;
118#endif
119
120 case _SC_PRIORITY_SCHEDULING:
121#if CONF_IS_DEFINED_SET (_POSIX_PRIORITY_SCHEDULING)
122 return _POSIX_PRIORITY_SCHEDULING;
123#else
124 return -1;
125#endif
126
127 case _SC_TIMERS:
128#if CONF_IS_DEFINED_SET (_POSIX_TIMERS)
129 return _POSIX_TIMERS;
130#else
131 return -1;
132#endif
133
134 case _SC_ASYNCHRONOUS_IO:
135#if CONF_IS_DEFINED_SET (_POSIX_ASYNCHRONOUS_IO)
136 return _POSIX_ASYNCHRONOUS_IO;
137#else
138 return -1;
139#endif
140
141 case _SC_PRIORITIZED_IO:
142#if CONF_IS_DEFINED_SET (_POSIX_PRIORITIZED_IO)
143 return _POSIX_PRIORITIZED_IO;
144#else
145 return -1;
146#endif
147
148 case _SC_SYNCHRONIZED_IO:
149#if CONF_IS_DEFINED_SET (_POSIX_SYNCHRONIZED_IO)
150 return _POSIX_SYNCHRONIZED_IO;
151#else
152 return -1;
153#endif
154
155 case _SC_FSYNC:
156#if CONF_IS_DEFINED_SET (_POSIX_FSYNC)
157 return _POSIX_FSYNC;
158#else
159 return -1;
160#endif
161
162 case _SC_MAPPED_FILES:
163#if CONF_IS_DEFINED_SET (_POSIX_MAPPED_FILES)
164 return _POSIX_MAPPED_FILES;
165#else
166 return -1;
167#endif
168
169 case _SC_MEMLOCK:
170#if CONF_IS_DEFINED_SET (_POSIX_MEMLOCK)
171 return _POSIX_MEMLOCK;
172#else
173 return -1;
174#endif
175
176 case _SC_MEMLOCK_RANGE:
177#if CONF_IS_DEFINED_SET (_POSIX_MEMLOCK_RANGE)
178 return _POSIX_MEMLOCK_RANGE;
179#else
180 return -1;
181#endif
182
183 case _SC_MEMORY_PROTECTION:
184#if CONF_IS_DEFINED_SET (_POSIX_MEMORY_PROTECTION)
185 return _POSIX_MEMORY_PROTECTION;
186#else
187 return -1;
188#endif
189
190 case _SC_MESSAGE_PASSING:
191#if CONF_IS_DEFINED_SET (_POSIX_MESSAGE_PASSING)
192 return _POSIX_MESSAGE_PASSING;
193#else
194 return -1;
195#endif
196
197 case _SC_SEMAPHORES:
198#if CONF_IS_DEFINED_SET (_POSIX_SEMAPHORES)
199 return _POSIX_SEMAPHORES;
200#else
201 return -1;
202#endif
203
204 case _SC_SHARED_MEMORY_OBJECTS:
205#if CONF_IS_DEFINED_SET (_POSIX_SHARED_MEMORY_OBJECTS)
206 return _POSIX_SHARED_MEMORY_OBJECTS;
207#else
208 return -1;
209#endif
210
211 case _SC_VERSION:
212 return _POSIX_VERSION;
213
214 case _SC_PAGESIZE:
215 return __getpagesize ();
216
217 case _SC_AIO_LISTIO_MAX:
218#ifdef AIO_LISTIO_MAX
219 return AIO_LISTIO_MAX;
220#else
221 return -1;
222#endif
223
224 case _SC_AIO_MAX:
225#ifdef AIO_MAX
226 return AIO_MAX;
227#else
228 return -1;
229#endif
230
231 case _SC_AIO_PRIO_DELTA_MAX:
232#ifdef AIO_PRIO_DELTA_MAX
233 return AIO_PRIO_DELTA_MAX;
234#else
235 return -1;
236#endif
237
238 case _SC_DELAYTIMER_MAX:
239#ifdef DELAYTIMER_MAX
240 return DELAYTIMER_MAX;
241#else
242 return -1;
243#endif
244
245 case _SC_MQ_OPEN_MAX:
246#ifdef MQ_OPEN_MAX
247 return MQ_OPEN_MAX;
248#else
249 return -1;
250#endif
251
252 case _SC_MQ_PRIO_MAX:
253#ifdef MQ_PRIO_MAX
254 return MQ_PRIO_MAX;
255#else
256 return -1;
257#endif
258
259 case _SC_RTSIG_MAX:
260#ifdef RTSIG_MAX
261 return RTSIG_MAX;
262#else
263 return -1;
264#endif
265
266 case _SC_SEM_NSEMS_MAX:
267#ifdef SEM_NSEMS_MAX
268 return SEM_NSEMS_MAX;
269#else
270 return -1;
271#endif
272
273 case _SC_SEM_VALUE_MAX:
274#ifdef SEM_VALUE_MAX
275 return SEM_VALUE_MAX;
276#else
277 return -1;
278#endif
279
280 case _SC_SIGQUEUE_MAX:
281#ifdef SIGQUEUE_MAX
282 return SIGQUEUE_MAX;
283#else
284 return -1;
285#endif
286
287 case _SC_TIMER_MAX:
288#ifdef TIMER_MAX
289 return TIMER_MAX;
290#else
291 return -1;
292#endif
293
294 case _SC_BC_BASE_MAX:
295#ifdef BC_BASE_MAX
296 return BC_BASE_MAX;
297#else
298 return -1;
299#endif
300
301 case _SC_BC_DIM_MAX:
302#ifdef BC_DIM_MAX
303 return BC_DIM_MAX;
304#else
305 return -1;
306#endif
307
308 case _SC_BC_SCALE_MAX:
309#ifdef BC_SCALE_MAX
310 return BC_SCALE_MAX;
311#else
312 return -1;
313#endif
314
315 case _SC_BC_STRING_MAX:
316#ifdef BC_STRING_MAX
317 return BC_STRING_MAX;
318#else
319 return -1;
320#endif
321
322 case _SC_COLL_WEIGHTS_MAX:
323#ifdef COLL_WEIGHTS_MAX
324 return COLL_WEIGHTS_MAX;
325#else
326 return -1;
327#endif
328
329 case _SC_EXPR_NEST_MAX:
330#ifdef EXPR_NEST_MAX
331 return EXPR_NEST_MAX;
332#else
333 return -1;
334#endif
335
336 case _SC_LINE_MAX:
337#ifdef LINE_MAX
338 return LINE_MAX;
339#else
340 return -1;
341#endif
342
343 case _SC_RE_DUP_MAX:
344#ifdef RE_DUP_MAX
345 return RE_DUP_MAX;
346#else
347 return -1;
348#endif
349
350 case _SC_CHARCLASS_NAME_MAX:
351#ifdef CHARCLASS_NAME_MAX
352 return CHARCLASS_NAME_MAX;
353#else
354 return -1;
355#endif
356
357 case _SC_PII:
358#if CONF_IS_DEFINED_SET (_POSIX_PII)
359 return 1;
360#else
361 return -1;
362#endif
363
364 case _SC_PII_XTI:
365#if CONF_IS_DEFINED_SET (_POSIX_PII_XTI)
366 return 1;
367#else
368 return -1;
369#endif
370
371 case _SC_PII_SOCKET:
372#if CONF_IS_DEFINED_SET (_POSIX_PII_SOCKET)
373 return 1;
374#else
375 return -1;
376#endif
377
378 case _SC_PII_INTERNET:
379#if CONF_IS_DEFINED_SET (_POSIX_PII_INTERNET)
380 return 1;
381#else
382 return -1;
383#endif
384
385 case _SC_PII_OSI:
386#if CONF_IS_DEFINED_SET (_POSIX_PII_OSI)
387 return 1;
388#else
389 return -1;
390#endif
391
392 case _SC_POLL:
393#if CONF_IS_DEFINED_SET (_POSIX_POLL)
394 return 1;
395#else
396 return -1;
397#endif
398
399 case _SC_SELECT:
400#if CONF_IS_DEFINED_SET (_POSIX_SELECT)
401 return 1;
402#else
403 return -1;
404#endif
405
406 /* The same as _SC_IOV_MAX. */
407 case _SC_UIO_MAXIOV:
408#ifdef UIO_MAXIOV
409 return UIO_MAXIOV;
410#else
411 return -1;
412#endif
413
414 case _SC_PII_INTERNET_STREAM:
415#if CONF_IS_DEFINED_SET (_POSIX_PII_INTERNET_STREAM)
416 return 1;
417#else
418 return -1;
419#endif
420
421 case _SC_PII_INTERNET_DGRAM:
422#if CONF_IS_DEFINED_SET (_POSIX_PII_INTERNET_DGRAM)
423 return 1;
424#else
425 return -1;
426#endif
427
428 case _SC_PII_OSI_COTS:
429#if CONF_IS_DEFINED_SET (_POSIX_PII_OSI_COTS)
430 return 1;
431#else
432 return -1;
433#endif
434
435 case _SC_PII_OSI_CLTS:
436#if CONF_IS_DEFINED_SET (_POSIX_PII_OSI_CLTS)
437 return 1;
438#else
439 return -1;
440#endif
441
442 case _SC_PII_OSI_M:
443#if CONF_IS_DEFINED_SET (_POSIX_PII_OSI_M)
444 return 1;
445#else
446 return -1;
447#endif
448
449 case _SC_T_IOV_MAX:
450#ifdef _T_IOV_MAX
451 return _T_IOV_MAX;
452#else
453 return -1;
454#endif
455
456 case _SC_2_VERSION:
457 return _POSIX2_VERSION;
458
459 case _SC_2_C_BIND:
460#ifdef _POSIX2_C_BIND
461 return _POSIX2_C_BIND;
462#else
463 return -1;
464#endif
465
466 case _SC_2_C_DEV:
467#ifdef _POSIX2_C_DEV
468 return _POSIX2_C_DEV;
469#else
470 return -1;
471#endif
472
473 case _SC_2_C_VERSION:
474#ifdef _POSIX2_C_VERSION
475 return _POSIX2_C_VERSION;
476#else
477 return -1;
478#endif
479
480 case _SC_2_FORT_DEV:
481#ifdef _POSIX2_FORT_DEV
482 return _POSIX2_FORT_DEV;
483#else
484 return -1;
485#endif
486
487 case _SC_2_FORT_RUN:
488#ifdef _POSIX2_FORT_RUN
489 return _POSIX2_FORT_RUN;
490#else
491 return -1;
492#endif
493
494 case _SC_2_LOCALEDEF:
495#ifdef _POSIX2_LOCALEDEF
496 return _POSIX2_LOCALEDEF;
497#else
498 return -1;
499#endif
500
501 case _SC_2_SW_DEV:
502#ifdef _POSIX2_SW_DEV
503 return _POSIX2_SW_DEV;
504#else
505 return -1;
506#endif
507
508 case _SC_2_CHAR_TERM:
509#ifdef _POSIX2_CHAR_TERM
510 return _POSIX2_CHAR_TERM;
511#else
512 return -1;
513#endif
514
515 case _SC_2_UPE:
516#ifdef _POSIX2_UPE
517 return _POSIX2_UPE;
518#else
519 return -1;
520#endif
521
522 /* POSIX 1003.1c (POSIX Threads). */
523 case _SC_THREADS:
524#if CONF_IS_DEFINED_SET (_POSIX_THREADS)
525 return _POSIX_THREADS;
526#else
527 return -1;
528#endif
529
530 case _SC_THREAD_SAFE_FUNCTIONS:
531#if CONF_IS_DEFINED_SET (_POSIX_THREAD_SAFE_FUNCTIONS)
532 return _POSIX_THREAD_SAFE_FUNCTIONS;
533#else
534 return -1;
535#endif
536
537 case _SC_GETGR_R_SIZE_MAX:
538 return NSS_BUFLEN_GROUP;
539
540 case _SC_GETPW_R_SIZE_MAX:
541 return NSS_BUFLEN_PASSWD;
542
543 case _SC_LOGIN_NAME_MAX:
544#ifdef LOGIN_NAME_MAX
545 return LOGIN_NAME_MAX;
546#else
547 return -1;
548#endif
549
550 case _SC_TTY_NAME_MAX:
551#ifdef TTY_NAME_MAX
552 return TTY_NAME_MAX;
553#else
554 return -1;
555#endif
556
557 case _SC_THREAD_DESTRUCTOR_ITERATIONS:
558#if CONF_IS_DEFINED_SET (_POSIX_THREAD_DESTRUCTOR_ITERATIONS)
559 return _POSIX_THREAD_DESTRUCTOR_ITERATIONS;
560#else
561 return -1;
562#endif
563
564 case _SC_THREAD_KEYS_MAX:
565#ifdef PTHREAD_KEYS_MAX
566 return PTHREAD_KEYS_MAX;
567#else
568 return -1;
569#endif
570
571 case _SC_THREAD_STACK_MIN:
572#ifdef PTHREAD_STACK_MIN
573 return PTHREAD_STACK_MIN;
574#else
575 return -1;
576#endif
577
578 case _SC_THREAD_THREADS_MAX:
579#ifdef PTHREAD_THREADS_MAX
580 return PTHREAD_THREADS_MAX;
581#else
582 return -1;
583#endif
584
585 case _SC_THREAD_ATTR_STACKADDR:
586#if CONF_IS_DEFINED_SET (_POSIX_THREAD_ATTR_STACKADDR)
587 return _POSIX_THREAD_ATTR_STACKADDR;
588#else
589 return -1;
590#endif
591
592 case _SC_THREAD_ATTR_STACKSIZE:
593#if CONF_IS_DEFINED_SET (_POSIX_THREAD_ATTR_STACKSIZE)
594 return _POSIX_THREAD_ATTR_STACKSIZE;
595#else
596 return -1;
597#endif
598
599 case _SC_THREAD_PRIORITY_SCHEDULING:
600#if CONF_IS_DEFINED_SET (_POSIX_THREAD_PRIORITY_SCHEDULING)
601 return _POSIX_THREAD_PRIORITY_SCHEDULING;
602#else
603 return -1;
604#endif
605
606 case _SC_THREAD_PRIO_INHERIT:
607#if CONF_IS_DEFINED_SET (_POSIX_THREAD_PRIO_INHERIT)
608 return _POSIX_THREAD_PRIO_INHERIT;
609#else
610 return -1;
611#endif
612
613 case _SC_THREAD_PRIO_PROTECT:
614#if CONF_IS_DEFINED_SET (_POSIX_THREAD_PRIO_PROTECT)
615 return _POSIX_THREAD_PRIO_PROTECT;
616#else
617 return -1;
618#endif
619
620 case _SC_THREAD_PROCESS_SHARED:
621#if CONF_IS_DEFINED_SET (_POSIX_THREAD_PROCESS_SHARED)
622 return _POSIX_THREAD_PROCESS_SHARED;
623#else
624 return -1;
625#endif
626
627 case _SC_NPROCESSORS_CONF:
628 return __get_nprocs_conf ();
629
630 case _SC_NPROCESSORS_ONLN:
631 return __get_nprocs ();
632
633 case _SC_PHYS_PAGES:
634 return __get_phys_pages ();
635
636 case _SC_AVPHYS_PAGES:
637 return __get_avphys_pages ();
638
639 case _SC_ATEXIT_MAX:
640 /* We have no limit since we use lists. */
641 return INT_MAX;
642
643 case _SC_PASS_MAX:
644 /* We have no limit but since the return value might be used to
645 allocate a buffer we restrict the value. */
646 return BUFSIZ;
647
648 case _SC_XOPEN_VERSION:
649 return _XOPEN_VERSION;
650
651 case _SC_XOPEN_XCU_VERSION:
652 return _XOPEN_XCU_VERSION;
653
654 case _SC_XOPEN_UNIX:
655 return _XOPEN_UNIX;
656
657 case _SC_XOPEN_CRYPT:
658#ifdef _XOPEN_CRYPT
659 return _XOPEN_CRYPT;
660#else
661 return -1;
662#endif
663
664 case _SC_XOPEN_ENH_I18N:
665#ifdef _XOPEN_ENH_I18N
666 return _XOPEN_ENH_I18N;
667#else
668 return -1;
669#endif
670
671 case _SC_XOPEN_SHM:
672#ifdef _XOPEN_SHM
673 return _XOPEN_SHM;
674#else
675 return -1;
676#endif
677
678 case _SC_XOPEN_XPG2:
679#ifdef _XOPEN_XPG2
680 return _XOPEN_XPG2;
681#else
682 return -1;
683#endif
684
685 case _SC_XOPEN_XPG3:
686#ifdef _XOPEN_XPG3
687 return _XOPEN_XPG3;
688#else
689 return -1;
690#endif
691
692 case _SC_XOPEN_XPG4:
693#ifdef _XOPEN_XPG4
694 return _XOPEN_XPG4;
695#else
696 return -1;
697#endif
698
699 case _SC_CHAR_BIT:
700 return CHAR_BIT;
701
702 case _SC_CHAR_MAX:
703 return CHAR_MAX;
704
705 case _SC_CHAR_MIN:
706 return CHAR_MIN;
707
708 case _SC_INT_MAX:
709 return INT_MAX;
710
711 case _SC_INT_MIN:
712 return INT_MIN;
713
714 case _SC_LONG_BIT:
715 return sizeof (long int) * CHAR_BIT;
716
717 case _SC_WORD_BIT:
718 return sizeof (int) * CHAR_BIT;
719
720 case _SC_MB_LEN_MAX:
721 return MB_LEN_MAX;
722
723 case _SC_NZERO:
724 return NZERO;
725
726 case _SC_SSIZE_MAX:
727 return _POSIX_SSIZE_MAX;
728
729 case _SC_SCHAR_MAX:
730 return SCHAR_MAX;
731
732 case _SC_SCHAR_MIN:
733 return SCHAR_MIN;
734
735 case _SC_SHRT_MAX:
736 return SHRT_MAX;
737
738 case _SC_SHRT_MIN:
739 return SHRT_MIN;
740
741 case _SC_UCHAR_MAX:
742 return UCHAR_MAX;
743
744 case _SC_UINT_MAX:
745 return UINT_MAX;
746
747 case _SC_ULONG_MAX:
748 return ULONG_MAX;
749
750 case _SC_USHRT_MAX:
751 return USHRT_MAX;
752
753 case _SC_NL_ARGMAX:
754#ifdef NL_ARGMAX
755 return NL_ARGMAX;
756#else
757 return -1;
758#endif
759
760 case _SC_NL_LANGMAX:
761#ifdef NL_LANGMAX
762 return NL_LANGMAX;
763#else
764 return -1;
765#endif
766
767 case _SC_NL_MSGMAX:
768#ifdef NL_MSGMAX
769 return NL_MSGMAX;
770#else
771 return -1;
772#endif
773
774 case _SC_NL_NMAX:
775#ifdef NL_NMAX
776 return NL_NMAX;
777#else
778 return -1;
779#endif
780
781 case _SC_NL_SETMAX:
782#ifdef NL_SETMAX
783 return NL_SETMAX;
784#else
785 return -1;
786#endif
787
788 case _SC_NL_TEXTMAX:
789#ifdef NL_TEXTMAX
790 return NL_TEXTMAX;
791#else
792 return -1;
793#endif
794
795#define START_ENV_GROUP(VERSION) \
796 /* Empty. */
797
798#define END_ENV_GROUP(VERSION) \
799 /* Empty. */
800
801#define KNOWN_ABSENT_ENVIRONMENT(SC_PREFIX, ENV_PREFIX, SUFFIX) \
802 case _SC_##SC_PREFIX##_##SUFFIX: \
803 return _##ENV_PREFIX##_##SUFFIX;
804
805#define KNOWN_PRESENT_ENVIRONMENT(SC_PREFIX, ENV_PREFIX, SUFFIX) \
806 case _SC_##SC_PREFIX##_##SUFFIX: \
807 return _##ENV_PREFIX##_##SUFFIX;
808
809#define UNKNOWN_ENVIRONMENT(SC_PREFIX, ENV_PREFIX, SUFFIX) \
810 case _SC_##SC_PREFIX##_##SUFFIX: \
811 return __sysconf_check_spec (#SUFFIX);
812
813#include <posix/posix-envs.def>
814
815#undef START_ENV_GROUP
816#undef END_ENV_GROUP
817#undef KNOWN_ABSENT_ENVIRONMENT
818#undef KNOWN_PRESENT_ENVIRONMENT
819#undef UNKNOWN_ENVIRONMENT
820
821 case _SC_XOPEN_LEGACY:
822 return _XOPEN_LEGACY;
823
824 case _SC_XOPEN_REALTIME:
825#ifdef _XOPEN_REALTIME
826 return _XOPEN_REALTIME;
827#else
828 return -1;
829#endif
830 case _SC_XOPEN_REALTIME_THREADS:
831#ifdef _XOPEN_REALTIME_THREADS
832 return _XOPEN_REALTIME_THREADS;
833#else
834 return -1;
835#endif
836
837 case _SC_ADVISORY_INFO:
838#if CONF_IS_DEFINED_SET (_POSIX_ADVISORY_INFO)
839 return _POSIX_ADVISORY_INFO;
840#else
841 return -1;
842#endif
843
844 case _SC_BARRIERS:
845#if CONF_IS_DEFINED_SET (_POSIX_BARRIERS)
846 return _POSIX_BARRIERS;
847#else
848 return -1;
849#endif
850
851 case _SC_BASE:
852#if CONF_IS_DEFINED_SET (_POSIX_BASE)
853 return _POSIX_BASE;
854#else
855 return -1;
856#endif
857 case _SC_C_LANG_SUPPORT:
858#if CONF_IS_DEFINED_SET (_POSIX_C_LANG_SUPPORT)
859 return _POSIX_C_LANG_SUPPORT;
860#else
861 return -1;
862#endif
863 case _SC_C_LANG_SUPPORT_R:
864#if CONF_IS_DEFINED_SET (_POSIX_C_LANG_SUPPORT_R)
865 return _POSIX_C_LANG_SUPPORT_R;
866#else
867 return -1;
868#endif
869
870 case _SC_CLOCK_SELECTION:
871#if CONF_IS_DEFINED_SET (_POSIX_CLOCK_SELECTION)
872 return _POSIX_CLOCK_SELECTION;
873#else
874 return -1;
875#endif
876
877 case _SC_CPUTIME:
878#if CONF_IS_DEFINED_SET (_POSIX_CPUTIME)
879 return _POSIX_CPUTIME;
880#else
881 return -1;
882#endif
883
884 case _SC_DEVICE_IO:
885#if CONF_IS_DEFINED_SET (_POSIX_DEVICE_IO)
886 return _POSIX_DEVICE_IO;
887#else
888 return -1;
889#endif
890 case _SC_DEVICE_SPECIFIC:
891#if CONF_IS_DEFINED_SET (_POSIX_DEVICE_SPECIFIC)
892 return _POSIX_DEVICE_SPECIFIC;
893#else
894 return -1;
895#endif
896 case _SC_DEVICE_SPECIFIC_R:
897#if CONF_IS_DEFINED_SET (_POSIX_DEVICE_SPECIFIC_R)
898 return _POSIX_DEVICE_SPECIFIC_R;
899#else
900 return -1;
901#endif
902
903 case _SC_FD_MGMT:
904#if CONF_IS_DEFINED_SET (_POSIX_FD_MGMT)
905 return _POSIX_FD_MGMT;
906#else
907 return -1;
908#endif
909
910 case _SC_FIFO:
911#if CONF_IS_DEFINED_SET (_POSIX_FIFO)
912 return _POSIX_FIFO;
913#else
914 return -1;
915#endif
916 case _SC_PIPE:
917#if CONF_IS_DEFINED_SET (_POSIX_PIPE)
918 return _POSIX_PIPE;
919#else
920 return -1;
921#endif
922
923 case _SC_FILE_ATTRIBUTES:
924#if CONF_IS_DEFINED_SET (_POSIX_FILE_ATTRIBUTES)
925 return _POSIX_FILE_ATTRIBUTES;
926#else
927 return -1;
928#endif
929 case _SC_FILE_LOCKING:
930#if CONF_IS_DEFINED_SET (_POSIX_FILE_LOCKING)
931 return _POSIX_FILE_LOCKING;
932#else
933 return -1;
934#endif
935 case _SC_FILE_SYSTEM:
936#if CONF_IS_DEFINED_SET (_POSIX_FILE_SYSTEM)
937 return _POSIX_FILE_SYSTEM;
938#else
939 return -1;
940#endif
941
942 case _SC_MONOTONIC_CLOCK:
943#if CONF_IS_DEFINED_SET (_POSIX_MONOTONIC_CLOCK)
944 return _POSIX_MONOTONIC_CLOCK;
945#else
946 return -1;
947#endif
948
949 case _SC_MULTI_PROCESS:
950#if CONF_IS_DEFINED_SET (_POSIX_MULTI_PROCESS)
951 return _POSIX_MULTI_PROCESS;
952#else
953 return -1;
954#endif
955 case _SC_SINGLE_PROCESS:
956#if CONF_IS_DEFINED_SET (_POSIX_SINGLE_PROCESS)
957 return _POSIX_SINGLE_PROCESS;
958#else
959 return -1;
960#endif
961
962 case _SC_NETWORKING:
963#if CONF_IS_DEFINED_SET (_POSIX_NETWORKING)
964 return _POSIX_NETWORKING;
965#else
966 return -1;
967#endif
968
969 case _SC_READER_WRITER_LOCKS:
970#if CONF_IS_DEFINED_SET (_POSIX_READER_WRITER_LOCKS)
971 return _POSIX_READER_WRITER_LOCKS;
972#else
973 return -1;
974#endif
975 case _SC_SPIN_LOCKS:
976#if CONF_IS_DEFINED_SET (_POSIX_SPIN_LOCKS)
977 return _POSIX_SPIN_LOCKS;
978#else
979 return -1;
980#endif
981
982 case _SC_REGEXP:
983#if CONF_IS_DEFINED_SET (_POSIX_REGEXP)
984 return _POSIX_REGEXP;
985#else
986 return -1;
987#endif
988 /* _REGEX_VERSION has been removed with IEEE Std 1003.1-2001/Cor 2-2004,
989 item XSH/TC2/D6/137. */
990 case _SC_REGEX_VERSION:
991 return -1;
992
993 case _SC_SHELL:
994#if CONF_IS_DEFINED_SET (_POSIX_SHELL)
995 return _POSIX_SHELL;
996#else
997 return -1;
998#endif
999
1000 case _SC_SIGNALS:
1001#if CONF_IS_DEFINED (_POSIX_SIGNALS)
1002 return _POSIX_SIGNALS;
1003#else
1004 return -1;
1005#endif
1006
1007 case _SC_SPAWN:
1008#if CONF_IS_DEFINED_SET (_POSIX_SPAWN)
1009 return _POSIX_SPAWN;
1010#else
1011 return -1;
1012#endif
1013
1014 case _SC_SPORADIC_SERVER:
1015#if CONF_IS_DEFINED_SET (_POSIX_SPORADIC_SERVER)
1016 return _POSIX_SPORADIC_SERVER;
1017#else
1018 return -1;
1019#endif
1020 case _SC_THREAD_SPORADIC_SERVER:
1021#if CONF_IS_DEFINED_SET (_POSIX_THREAD_SPORADIC_SERVER)
1022 return _POSIX_THREAD_SPORADIC_SERVER;
1023#else
1024 return -1;
1025#endif
1026
1027 case _SC_SYSTEM_DATABASE:
1028#if CONF_IS_DEFINED_SET (_POSIX_SYSTEM_DATABASE)
1029 return _POSIX_SYSTEM_DATABASE;
1030#else
1031 return -1;
1032#endif
1033 case _SC_SYSTEM_DATABASE_R:
1034#if CONF_IS_DEFINED_SET (_POSIX_SYSTEM_DATABASE_R)
1035 return _POSIX_SYSTEM_DATABASE_R;
1036#else
1037 return -1;
1038#endif
1039
1040 case _SC_THREAD_CPUTIME:
1041#if CONF_IS_DEFINED_SET (_POSIX_THREAD_CPUTIME)
1042 return _POSIX_THREAD_CPUTIME;
1043#else
1044 return -1;
1045#endif
1046
1047 case _SC_TIMEOUTS:
1048#if CONF_IS_DEFINED_SET (_POSIX_TIMEOUTS)
1049 return _POSIX_TIMEOUTS;
1050#else
1051 return -1;
1052#endif
1053
1054 case _SC_TYPED_MEMORY_OBJECTS:
1055#if CONF_IS_DEFINED_SET (_POSIX_TYPED_MEMORY_OBJECTS)
1056 return _POSIX_TYPED_MEMORY_OBJECTS;
1057#else
1058 return -1;
1059#endif
1060
1061 case _SC_USER_GROUPS:
1062#if CONF_IS_DEFINED_SET (_POSIX_USER_GROUPS)
1063 return _POSIX_USER_GROUPS;
1064#else
1065 return -1;
1066#endif
1067 case _SC_USER_GROUPS_R:
1068#if CONF_IS_DEFINED_SET (_POSIX_USER_GROUPS_R)
1069 return _POSIX_USER_GROUPS_R;
1070#else
1071 return -1;
1072#endif
1073
1074 case _SC_2_PBS:
1075#ifdef _POSIX2_PBS
1076 return _POSIX2_PBS;
1077#else
1078 return -1;
1079#endif
1080 case _SC_2_PBS_ACCOUNTING:
1081#ifdef _POSIX2_PBS_ACCOUNTING
1082 return _POSIX2_PBS_ACCOUNTING;
1083#else
1084 return -1;
1085#endif
1086 case _SC_2_PBS_CHECKPOINT:
1087#ifdef _POSIX2_PBS_CHECKPOINT
1088 return _POSIX2_PBS_CHECKPOINT;
1089#else
1090 return -1;
1091#endif
1092 case _SC_2_PBS_LOCATE:
1093#ifdef _POSIX2_PBS_LOCATE
1094 return _POSIX2_PBS_LOCATE;
1095#else
1096 return -1;
1097#endif
1098 case _SC_2_PBS_MESSAGE:
1099#ifdef _POSIX2_PBS_MESSAGE
1100 return _POSIX2_PBS_MESSAGE;
1101#else
1102 return -1;
1103#endif
1104 case _SC_2_PBS_TRACK:
1105#ifdef _POSIX2_PBS_TRACK
1106 return _POSIX2_PBS_TRACK;
1107#else
1108 return -1;
1109#endif
1110
1111 case _SC_SYMLOOP_MAX:
1112#ifdef SYMLOOP_MAX
1113 return SYMLOOP_MAX;
1114#else
1115 return -1;
1116#endif
1117
1118 case _SC_STREAMS:
1119#ifdef _XOPEN_STREAMS
1120 return _XOPEN_STREAMS;
1121#else
1122 return -1;
1123#endif
1124
1125 case _SC_HOST_NAME_MAX:
1126#ifdef HOST_NAME_MAX
1127 return HOST_NAME_MAX;
1128#else
1129 return -1;
1130#endif
1131
1132 case _SC_TRACE:
1133#if CONF_IS_DEFINED_SET (_POSIX_TRACE)
1134 return _POSIX_TRACE;
1135#else
1136 return -1;
1137#endif
1138 case _SC_TRACE_EVENT_FILTER:
1139#if CONF_IS_DEFINED_SET (_POSIX_TRACE_EVENT_FILTER)
1140 return _POSIX_TRACE_EVENT_FILTER;
1141#else
1142 return -1;
1143#endif
1144 case _SC_TRACE_INHERIT:
1145#if CONF_IS_DEFINED_SET (_POSIX_TRACE_INHERIT)
1146 return _POSIX_TRACE_INHERIT;
1147#else
1148 return -1;
1149#endif
1150 case _SC_TRACE_LOG:
1151#if CONF_IS_DEFINED_SET (_POSIX_TRACE_LOG)
1152 return _POSIX_TRACE_LOG;
1153#else
1154 return -1;
1155#endif
1156
1157 case _SC_TRACE_EVENT_NAME_MAX:
1158 case _SC_TRACE_NAME_MAX:
1159 case _SC_TRACE_SYS_MAX:
1160 case _SC_TRACE_USER_EVENT_MAX:
1161 /* No support for tracing. */
1162
1163 case _SC_XOPEN_STREAMS:
1164 /* No support for STREAMS. */
1165 return -1;
1166
1167 case _SC_LEVEL1_ICACHE_SIZE:
1168 case _SC_LEVEL1_ICACHE_ASSOC:
1169 case _SC_LEVEL1_ICACHE_LINESIZE:
1170 case _SC_LEVEL1_DCACHE_SIZE:
1171 case _SC_LEVEL1_DCACHE_ASSOC:
1172 case _SC_LEVEL1_DCACHE_LINESIZE:
1173 case _SC_LEVEL2_CACHE_SIZE:
1174 case _SC_LEVEL2_CACHE_ASSOC:
1175 case _SC_LEVEL2_CACHE_LINESIZE:
1176 case _SC_LEVEL3_CACHE_SIZE:
1177 case _SC_LEVEL3_CACHE_ASSOC:
1178 case _SC_LEVEL3_CACHE_LINESIZE:
1179 case _SC_LEVEL4_CACHE_SIZE:
1180 case _SC_LEVEL4_CACHE_ASSOC:
1181 case _SC_LEVEL4_CACHE_LINESIZE:
1182 /* In general we cannot determine these values. Therefore we
1183 return zero which indicates that no information is
1184 available. */
1185 return 0;
1186
1187 case _SC_IPV6:
1188#if CONF_IS_DEFINED_SET (_POSIX_IPV6)
1189 return _POSIX_IPV6;
1190#else
1191 return -1;
1192#endif
1193
1194 case _SC_RAW_SOCKETS:
1195#if CONF_IS_DEFINED_SET (_POSIX_RAW_SOCKETS)
1196 return _POSIX_RAW_SOCKETS;
1197#else
1198 return -1;
1199#endif
1200 }
1201}
1202
1203#undef __sysconf
1204weak_alias (__sysconf, sysconf)
1205libc_hidden_def (__sysconf)
1206
1207#if NEED_CHECK_SPEC
1208static long int
1209__sysconf_check_spec (const char *spec)
1210{
1211 int save_errno = errno;
1212
1213 const char *getconf_dir = __libc_secure_getenv ("GETCONF_DIR") ?: GETCONF_DIR;
1214 size_t getconf_dirlen = strlen (getconf_dir);
1215 size_t speclen = strlen (spec);
1216
1217 char name[getconf_dirlen + sizeof ("/POSIX_V6_") + speclen];
1218 memcpy (mempcpy (mempcpy (name, getconf_dir, getconf_dirlen),
1219 "/POSIX_V6_", sizeof ("/POSIX_V6_") - 1),
1220 spec, speclen + 1);
1221
1222 struct stat64 st;
1223 long int ret = __xstat64 (_STAT_VER, name, &st) >= 0 ? 1 : -1;
1224
1225 __set_errno (save_errno);
1226 return ret;
1227}
1228#endif
1229