1POSIXOPTIONS(7)            Linux Programmer's Manual           POSIXOPTIONS(7)
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NAME

6       posixoptions - optional parts of the POSIX standard
7

DESCRIPTION

9       The  POSIX  standard  (the  information below is from POSIX.1-2001) de‐
10       scribes a set of behaviors and interfaces for a compliant system.  How‐
11       ever, many interfaces are optional and there are feature test macros to
12       test the availability of interfaces  at  compile  time,  and  functions
13       sysconf(3),  fpathconf(3),  pathconf(3),  confstr(3)  to do this at run
14       time.  From shell scripts one can use getconf(1).  For more detail, see
15       sysconf(3).
16
17       We give the name of the POSIX abbreviation, the option, the name of the
18       sysconf(3) parameter used to inquire about the option, and  possibly  a
19       very  short  description.  Much more precise detail can be found in the
20       POSIX standard itself, versions  of  which  can  nowadays  be  accessed
21       freely on the web.
22
23   ADV - _POSIX_ADVISORY_INFO - _SC_ADVISORY_INFO
24       The following advisory functions are present:
25
26           posix_fadvise()
27           posix_fallocate()
28           posix_memalign()
29           posix_madvise()
30
31   AIO - _POSIX_ASYNCHRONOUS_IO - _SC_ASYNCHRONOUS_IO
32       The header <aio.h> is present.  The following functions are present:
33
34           aio_cancel()
35           aio_error()
36           aio_fsync()
37           aio_read()
38           aio_return()
39           aio_suspend()
40           aio_write()
41           lio_listio()
42
43   BAR - _POSIX_BARRIERS - _SC_BARRIERS
44       This option implies the _POSIX_THREADS and _POSIX_THREAD_SAFE_FUNCTIONS
45       options.  The following functions are present:
46
47           pthread_barrier_destroy()
48           pthread_barrier_init()
49           pthread_barrier_wait()
50           pthread_barrierattr_destroy()
51           pthread_barrierattr_init()
52
53   --- - POSIX_CHOWN_RESTRICTED
54       If this option is in effect (as it always is under POSIX.1-2001),  then
55       only root may change the owner of a file, and nonroot can set the group
56       of a file only to one of the groups it belongs to.   This  affects  the
57       following functions
58
59           chown()
60           fchown()
61
62   CS - _POSIX_CLOCK_SELECTION - _SC_CLOCK_SELECTION
63       This  option implies the _POSIX_TIMERS option.  The following functions
64       are present:
65
66           pthread_condattr_getclock()
67           pthread_condattr_setclock()
68           clock_nanosleep()
69
70       If CLOCK_REALTIME is changed by the function clock_settime(), then this
71       affects all timers set for an absolute time.
72
73   CPT - _POSIX_CPUTIME - _SC_CPUTIME
74       The  CLOCK_PROCESS_CPUTIME_ID clock ID is supported.  The initial value
75       of this  clock  is  0  for  each  process.   This  option  implies  the
76       _POSIX_TIMERS option.  The function clock_getcpuclockid() is present.
77
78   --- - _POSIX_FILE_LOCKING - _SC_FILE_LOCKING
79       This option has been deleted.  Not in final XPG6.
80
81   FSC - _POSIX_FSYNC - _SC_FSYNC
82       The function fsync() is present.
83
84   IP6 - _POSIX_IPV6 - _SC_IPV6
85       Internet Protocol Version 6 is supported.
86
87   --- - _POSIX_JOB_CONTROL - _SC_JOB_CONTROL
88       If  this option is in effect (as it always is under POSIX.1-2001), then
89       the system implements POSIX-style job control, and the following  func‐
90       tions are present:
91
92           setpgid()
93           tcdrain()
94           tcflush()
95           tcgetpgrp()
96           tcsendbreak()
97           tcsetattr()
98           tcsetpgrp()
99
100   MF - _POSIX_MAPPED_FILES - _SC_MAPPED_FILES
101       Shared  memory is supported.  The include file <sys/mman.h> is present.
102       The following functions are present:
103
104           mmap()
105           msync()
106           munmap()
107
108   ML - _POSIX_MEMLOCK - _SC_MEMLOCK
109       Shared memory can be locked into core.   The  following  functions  are
110       present:
111
112           mlockall()
113           munlockall()
114
115   MR/MLR - _POSIX_MEMLOCK_RANGE - _SC_MEMLOCK_RANGE
116       More  precisely,  ranges  can be locked into core.  The following func‐
117       tions are present:
118
119           mlock()
120           munlock()
121
122   MPR - _POSIX_MEMORY_PROTECTION - _SC_MEMORY_PROTECTION
123       The function mprotect() is present.
124
125   MSG - _POSIX_MESSAGE_PASSING - _SC_MESSAGE_PASSING
126       The include file <mqueue.h> is present.  The  following  functions  are
127       present:
128
129           mq_close()
130           mq_getattr()
131           mq_notify()
132           mq_open()
133           mq_receive()
134           mq_send()
135           mq_setattr()
136           mq_unlink()
137
138   MON - _POSIX_MONOTONIC_CLOCK - _SC_MONOTONIC_CLOCK
139       CLOCK_MONOTONIC  is  supported.   This option implies the _POSIX_TIMERS
140       option.  The following functions are affected:
141
142           aio_suspend()
143           clock_getres()
144           clock_gettime()
145           clock_settime()
146           timer_create()
147
148   --- - _POSIX_MULTI_PROCESS - _SC_MULTI_PROCESS
149       This option has been deleted.  Not in final XPG6.
150
151   --- - _POSIX_NO_TRUNC
152       If this option is in effect (as it always is under POSIX.1-2001),  then
153       pathname components longer than NAME_MAX are not truncated, but give an
154       error.  This property may be dependent on the path prefix of the compo‐
155       nent.
156
157   PIO - _POSIX_PRIORITIZED_IO - _SC_PRIORITIZED_IO
158       This  option says that one can specify priorities for asynchronous I/O.
159       This affects the functions
160
161           aio_read()
162           aio_write()
163
164   PS - _POSIX_PRIORITY_SCHEDULING - _SC_PRIORITY_SCHEDULING
165       The include file <sched.h> is present.   The  following  functions  are
166       present:
167
168           sched_get_priority_max()
169           sched_get_priority_min()
170           sched_getparam()
171           sched_getscheduler()
172           sched_rr_get_interval()
173           sched_setparam()
174           sched_setscheduler()
175           sched_yield()
176
177       If  also  _POSIX_SPAWN  is  in effect, then the following functions are
178       present:
179
180           posix_spawnattr_getschedparam()
181           posix_spawnattr_getschedpolicy()
182           posix_spawnattr_setschedparam()
183           posix_spawnattr_setschedpolicy()
184
185   RS - _POSIX_RAW_SOCKETS
186       Raw sockets are supported.  The following functions are affected:
187
188           getsockopt()
189           setsockopt()
190
191   --- - _POSIX_READER_WRITER_LOCKS - _SC_READER_WRITER_LOCKS
192       This option  implies  the  _POSIX_THREADS  option.   Conversely,  under
193       POSIX.1-2001 the _POSIX_THREADS option implies this option.
194
195       The following functions are present:
196
197           pthread_rwlock_destroy()
198           pthread_rwlock_init()
199           pthread_rwlock_rdlock()
200           pthread_rwlock_tryrdlock()
201           pthread_rwlock_trywrlock()
202           pthread_rwlock_unlock()
203           pthread_rwlock_wrlock()
204           pthread_rwlockattr_destroy()
205           pthread_rwlockattr_init()
206
207   RTS - _POSIX_REALTIME_SIGNALS - _SC_REALTIME_SIGNALS
208       Realtime signals are supported.  The following functions are present:
209
210           sigqueue()
211           sigtimedwait()
212           sigwaitinfo()
213
214   --- - _POSIX_REGEXP - _SC_REGEXP
215       If  this option is in effect (as it always is under POSIX.1-2001), then
216       POSIX regular expressions are supported and the following functions are
217       present:
218
219           regcomp()
220           regerror()
221           regexec()
222           regfree()
223
224   --- - _POSIX_SAVED_IDS - _SC_SAVED_IDS
225       If  this option is in effect (as it always is under POSIX.1-2001), then
226       a process has a saved set-user-ID and a saved set-group-ID.   The  fol‐
227       lowing functions are affected:
228
229           exec()
230           kill()
231           seteuid()
232           setegid()
233           setgid()
234           setuid()
235
236   SEM - _POSIX_SEMAPHORES - _SC_SEMAPHORES
237       The include file <semaphore.h> is present.  The following functions are
238       present:
239
240           sem_close()
241           sem_destroy()
242           sem_getvalue()
243           sem_init()
244           sem_open()
245           sem_post()
246           sem_trywait()
247           sem_unlink()
248           sem_wait()
249
250   SHM - _POSIX_SHARED_MEMORY_OBJECTS - _SC_SHARED_MEMORY_OBJECTS
251       The following functions are present:
252
253           mmap()
254           munmap()
255           shm_open()
256           shm_unlink()
257
258   --- - _POSIX_SHELL - _SC_SHELL
259       If this option is in effect (as it always is under  POSIX.1-2001),  the
260       function system() is present.
261
262   SPN - _POSIX_SPAWN - _SC_SPAWN
263       This  option  describes support for process creation in a context where
264       it is difficult or impossible to use fork(), for  example,  because  no
265       MMU is present.
266
267       If  _POSIX_SPAWN  is in effect, then the include file <spawn.h> and the
268       following functions are present:
269
270           posix_spawn()
271           posix_spawn_file_actions_addclose()
272           posix_spawn_file_actions_adddup2()
273           posix_spawn_file_actions_addopen()
274           posix_spawn_file_actions_destroy()
275           posix_spawn_file_actions_init()
276           posix_spawnattr_destroy()
277           posix_spawnattr_getsigdefault()
278           posix_spawnattr_getflags()
279           posix_spawnattr_getpgroup()
280           posix_spawnattr_getsigmask()
281           posix_spawnattr_init()
282           posix_spawnattr_setsigdefault()
283           posix_spawnattr_setflags()
284           posix_spawnattr_setpgroup()
285           posix_spawnattr_setsigmask()
286           posix_spawnp()
287
288       If also _POSIX_PRIORITY_SCHEDULING is in  effect,  then  the  following
289       functions are present:
290
291           posix_spawnattr_getschedparam()
292           posix_spawnattr_getschedpolicy()
293           posix_spawnattr_setschedparam()
294           posix_spawnattr_setschedpolicy()
295
296   SPI - _POSIX_SPIN_LOCKS - _SC_SPIN_LOCKS
297       This option implies the _POSIX_THREADS and _POSIX_THREAD_SAFE_FUNCTIONS
298       options.  The following functions are present:
299
300           pthread_spin_destroy()
301           pthread_spin_init()
302           pthread_spin_lock()
303           pthread_spin_trylock()
304           pthread_spin_unlock()
305
306   SS - _POSIX_SPORADIC_SERVER - _SC_SPORADIC_SERVER
307       The scheduling policy SCHED_SPORADIC is supported.  This option implies
308       the _POSIX_PRIORITY_SCHEDULING option.  The following functions are af‐
309       fected:
310
311           sched_setparam()
312           sched_setscheduler()
313
314   SIO - _POSIX_SYNCHRONIZED_IO - _SC_SYNCHRONIZED_IO
315       The following functions are affected:
316
317           open()
318           msync()
319           fsync()
320           fdatasync()
321
322   TSA - _POSIX_THREAD_ATTR_STACKADDR - _SC_THREAD_ATTR_STACKADDR
323       The following functions are affected:
324
325           pthread_attr_getstack()
326           pthread_attr_getstackaddr()
327           pthread_attr_setstack()
328           pthread_attr_setstackaddr()
329
330   TSS - _POSIX_THREAD_ATTR_STACKSIZE - _SC_THREAD_ATTR_STACKSIZE
331       The following functions are affected:
332
333           pthread_attr_getstack()
334           pthread_attr_getstacksize()
335           pthread_attr_setstack()
336           pthread_attr_setstacksize()
337
338   TCT - _POSIX_THREAD_CPUTIME - _SC_THREAD_CPUTIME
339       The clockID CLOCK_THREAD_CPUTIME_ID is supported.  This option  implies
340       the _POSIX_TIMERS option.  The following functions are affected:
341
342           pthread_getcpuclockid()
343           clock_getres()
344           clock_gettime()
345           clock_settime()
346           timer_create()
347
348   TPI - _POSIX_THREAD_PRIO_INHERIT - _SC_THREAD_PRIO_INHERIT
349       The following functions are affected:
350
351           pthread_mutexattr_getprotocol()
352           pthread_mutexattr_setprotocol()
353
354   TPP - _POSIX_THREAD_PRIO_PROTECT - _SC_THREAD_PRIO_PROTECT
355       The following functions are affected:
356
357           pthread_mutex_getprioceiling()
358           pthread_mutex_setprioceiling()
359           pthread_mutexattr_getprioceiling()
360           pthread_mutexattr_getprotocol()
361           pthread_mutexattr_setprioceiling()
362           pthread_mutexattr_setprotocol()
363
364   TPS - _POSIX_THREAD_PRIORITY_SCHEDULING - _SC_THREAD_PRIORITY_SCHEDULING
365       If this option is in effect, the different threads inside a process can
366       run with different priorities and/or different schedulers.  The follow‐
367       ing functions are affected:
368
369           pthread_attr_getinheritsched()
370           pthread_attr_getschedpolicy()
371           pthread_attr_getscope()
372           pthread_attr_setinheritsched()
373           pthread_attr_setschedpolicy()
374           pthread_attr_setscope()
375           pthread_getschedparam()
376           pthread_setschedparam()
377           pthread_setschedprio()
378
379   TSH - _POSIX_THREAD_PROCESS_SHARED - _SC_THREAD_PROCESS_SHARED
380       The following functions are affected:
381
382           pthread_barrierattr_getpshared()
383           pthread_barrierattr_setpshared()
384           pthread_condattr_getpshared()
385           pthread_condattr_setpshared()
386           pthread_mutexattr_getpshared()
387           pthread_mutexattr_setpshared()
388           pthread_rwlockattr_getpshared()
389           pthread_rwlockattr_setpshared()
390
391   TSF - _POSIX_THREAD_SAFE_FUNCTIONS - _SC_THREAD_SAFE_FUNCTIONS
392       The following functions are affected:
393
394           readdir_r()
395           getgrgid_r()
396           getgrnam_r()
397           getpwnam_r()
398           getpwuid_r()
399           flockfile()
400           ftrylockfile()
401           funlockfile()
402           getc_unlocked()
403           getchar_unlocked()
404           putc_unlocked()
405           putchar_unlocked()
406           rand_r()
407           strerror_r()
408           strtok_r()
409           asctime_r()
410           ctime_r()
411           gmtime_r()
412           localtime_r()
413
414   TSP - _POSIX_THREAD_SPORADIC_SERVER - _SC_THREAD_SPORADIC_SERVER
415       This  option implies the _POSIX_THREAD_PRIORITY_SCHEDULING option.  The
416       following functions are affected:
417
418           sched_getparam()
419           sched_setparam()
420           sched_setscheduler()
421
422   THR - _POSIX_THREADS - _SC_THREADS
423       Basic support for POSIX threads is available.  The following  functions
424       are present:
425
426           pthread_atfork()
427           pthread_attr_destroy()
428           pthread_attr_getdetachstate()
429           pthread_attr_getschedparam()
430           pthread_attr_init()
431           pthread_attr_setdetachstate()
432           pthread_attr_setschedparam()
433           pthread_cancel()
434           pthread_cleanup_push()
435           pthread_cleanup_pop()
436           pthread_cond_broadcast()
437           pthread_cond_destroy()
438           pthread_cond_init()
439           pthread_cond_signal()
440           pthread_cond_timedwait()
441           pthread_cond_wait()
442           pthread_condattr_destroy()
443           pthread_condattr_init()
444           pthread_create()
445           pthread_detach()
446           pthread_equal()
447           pthread_exit()
448           pthread_getspecific()
449           pthread_join()
450           pthread_key_create()
451           pthread_key_delete()
452           pthread_mutex_destroy()
453           pthread_mutex_init()
454           pthread_mutex_lock()
455           pthread_mutex_trylock()
456           pthread_mutex_unlock()
457           pthread_mutexattr_destroy()
458           pthread_mutexattr_init()
459           pthread_once()
460           pthread_rwlock_destroy()
461           pthread_rwlock_init()
462           pthread_rwlock_rdlock()
463           pthread_rwlock_tryrdlock()
464           pthread_rwlock_trywrlock()
465           pthread_rwlock_unlock()
466           pthread_rwlock_wrlock()
467           pthread_rwlockattr_destroy()
468           pthread_rwlockattr_init()
469           pthread_self()
470           pthread_setcancelstate()
471           pthread_setcanceltype()
472           pthread_setspecific()
473           pthread_testcancel()
474
475   TMO - _POSIX_TIMEOUTS - _SC_TIMEOUTS
476       The following functions are present:
477
478           mq_timedreceive()
479           mq_timedsend()
480           pthread_mutex_timedlock()
481           pthread_rwlock_timedrdlock()
482           pthread_rwlock_timedwrlock()
483           sem_timedwait()
484           posix_trace_timedgetnext_event()
485
486   TMR - _POSIX_TIMERS - _SC_TIMERS
487       The following functions are present:
488
489           clock_getres()
490           clock_gettime()
491           clock_settime()
492           nanosleep()
493           timer_create()
494           timer_delete()
495           timer_gettime()
496           timer_getoverrun()
497           timer_settime()
498
499   TRC - _POSIX_TRACE - _SC_TRACE
500       POSIX tracing is available.  The following functions are present:
501
502           posix_trace_attr_destroy()
503           posix_trace_attr_getclockres()
504           posix_trace_attr_getcreatetime()
505           posix_trace_attr_getgenversion()
506           posix_trace_attr_getmaxdatasize()
507           posix_trace_attr_getmaxsystemeventsize()
508           posix_trace_attr_getmaxusereventsize()
509           posix_trace_attr_getname()
510           posix_trace_attr_getstreamfullpolicy()
511           posix_trace_attr_getstreamsize()
512           posix_trace_attr_init()
513           posix_trace_attr_setmaxdatasize()
514           posix_trace_attr_setname()
515           posix_trace_attr_setstreamsize()
516           posix_trace_attr_setstreamfullpolicy()
517           posix_trace_clear()
518           posix_trace_create()
519           posix_trace_event()
520           posix_trace_eventid_equal()
521           posix_trace_eventid_get_name()
522           posix_trace_eventid_open()
523           posix_trace_eventtypelist_getnext_id()
524           posix_trace_eventtypelist_rewind()
525           posix_trace_flush()
526           posix_trace_get_attr()
527           posix_trace_get_status()
528           posix_trace_getnext_event()
529           posix_trace_shutdown()
530           posix_trace_start()
531           posix_trace_stop()
532           posix_trace_trygetnext_event()
533
534   TEF - _POSIX_TRACE_EVENT_FILTER - _SC_TRACE_EVENT_FILTER
535       This  option  implies the _POSIX_TRACE option.  The following functions
536       are present:
537
538           posix_trace_eventset_add()
539           posix_trace_eventset_del()
540           posix_trace_eventset_empty()
541           posix_trace_eventset_fill()
542           posix_trace_eventset_ismember()
543           posix_trace_get_filter()
544           posix_trace_set_filter()
545           posix_trace_trid_eventid_open()
546
547   TRI - _POSIX_TRACE_INHERIT - _SC_TRACE_INHERIT
548       Tracing children of the traced process is supported.  This  option  im‐
549       plies the _POSIX_TRACE option.  The following functions are present:
550
551           posix_trace_attr_getinherited()
552           posix_trace_attr_setinherited()
553
554   TRL - _POSIX_TRACE_LOG - _SC_TRACE_LOG
555       This  option  implies the _POSIX_TRACE option.  The following functions
556       are present:
557
558           posix_trace_attr_getlogfullpolicy()
559           posix_trace_attr_getlogsize()
560           posix_trace_attr_setlogfullpolicy()
561           posix_trace_attr_setlogsize()
562           posix_trace_close()
563           posix_trace_create_withlog()
564           posix_trace_open()
565           posix_trace_rewind()
566
567   TYM - _POSIX_TYPED_MEMORY_OBJECTS - _SC_TYPED_MEMORY_OBJECT
568       The following functions are present:
569
570           posix_mem_offset()
571           posix_typed_mem_get_info()
572           posix_typed_mem_open()
573
574   --- - _POSIX_VDISABLE
575       Always present (probably 0).  Value to set a changeable special control
576       character to indicate that it is disabled.
577

X/OPEN SYSTEM INTERFACE EXTENSIONS

579   XSI - _XOPEN_CRYPT - _SC_XOPEN_CRYPT
580       The following functions are present:
581
582           crypt()
583           encrypt()
584           setkey()
585
586   XSI - _XOPEN_REALTIME - _SC_XOPEN_REALTIME
587       This option implies the following options:
588
589       _POSIX_ASYNCHRONOUS_IO==200112L
590       _POSIX_FSYNC
591       _POSIX_MAPPED_FILES
592       _POSIX_MEMLOCK==200112L
593       _POSIX_MEMLOCK_RANGE==200112L
594       _POSIX_MEMORY_PROTECTION
595       _POSIX_MESSAGE_PASSING==200112L
596       _POSIX_PRIORITIZED_IO
597       _POSIX_PRIORITY_SCHEDULING==200112L
598       _POSIX_REALTIME_SIGNALS==200112L
599       _POSIX_SEMAPHORES==200112L
600       _POSIX_SHARED_MEMORY_OBJECTS==200112L
601       _POSIX_SYNCHRONIZED_IO==200112L
602       _POSIX_TIMERS==200112L
603
604   ADV - --- - ---
605       The  Advanced  Realtime option group implies that the following options
606       are all defined to 200112L:
607
608       _POSIX_ADVISORY_INFO
609       _POSIX_CLOCK_SELECTION
610              (implies _POSIX_TIMERS)
611       _POSIX_CPUTIME
612              (implies _POSIX_TIMERS)
613       _POSIX_MONOTONIC_CLOCK
614              (implies _POSIX_TIMERS)
615       _POSIX_SPAWN
616       _POSIX_SPORADIC_SERVER
617              (implies _POSIX_PRIORITY_SCHEDULING)
618       _POSIX_TIMEOUTS
619       _POSIX_TYPED_MEMORY_OBJECTS
620
621   XSI - _XOPEN_REALTIME_THREADS - _SC_XOPEN_REALTIME_THREADS
622       This option implies that the  following  options  are  all  defined  to
623       200112L:
624
625       _POSIX_THREAD_PRIO_INHERIT
626       _POSIX_THREAD_PRIO_PROTECT
627       _POSIX_THREAD_PRIORITY_SCHEDULING
628
629   ADVANCED REALTIME THREADS - --- - ---
630       This  option  implies  that  the  following  options are all defined to
631       200112L:
632
633       _POSIX_BARRIERS
634              (implies _POSIX_THREADS, _POSIX_THREAD_SAFE_FUNCTIONS)
635       _POSIX_SPIN_LOCKS
636              (implies _POSIX_THREADS, _POSIX_THREAD_SAFE_FUNCTIONS)
637       _POSIX_THREAD_CPUTIME
638              (implies _POSIX_TIMERS)
639       _POSIX_THREAD_SPORADIC_SERVER
640              (implies _POSIX_THREAD_PRIORITY_SCHEDULING)
641
642   TRACING - --- - ---
643       This option implies that the  following  options  are  all  defined  to
644       200112L:
645
646       _POSIX_TRACE
647       _POSIX_TRACE_EVENT_FILTER
648       _POSIX_TRACE_LOG
649       _POSIX_TRACE_INHERIT
650
651   STREAMS - _XOPEN_STREAMS - _SC_XOPEN_STREAMS
652       The following functions are present:
653
654           fattach()
655           fdetach()
656           getmsg()
657           getpmsg()
658           ioctl()
659           isastream()
660           putmsg()
661           putpmsg()
662
663   XSI - _XOPEN_LEGACY - _SC_XOPEN_LEGACY
664       Functions  included  in  the legacy option group were previously manda‐
665       tory, but are now optional in this version.   The  following  functions
666       are present:
667
668           bcmp()
669           bcopy()
670           bzero()
671           ecvt()
672           fcvt()
673           ftime()
674           gcvt()
675           getwd()
676           index()
677           mktemp()
678           rindex()
679           utimes()
680           wcswcs()
681
682   XSI - _XOPEN_UNIX - _SC_XOPEN_UNIX
683       The following functions are present:
684
685           mmap()
686           munmap()
687           msync()
688
689       This option implies the following options:
690
691       _POSIX_FSYNC
692       _POSIX_MAPPED_FILES
693       _POSIX_MEMORY_PROTECTION
694       _POSIX_THREAD_ATTR_STACKADDR
695       _POSIX_THREAD_ATTR_STACKSIZE
696       _POSIX_THREAD_PROCESS_SHARED
697       _POSIX_THREAD_SAFE_FUNCTIONS
698       _POSIX_THREADS
699
700       This option may imply the following options from the XSI option groups:
701
702       Encryption (_XOPEN_CRYPT)
703       Realtime (_XOPEN_REALTIME)
704       Advanced Realtime (ADB)
705       Realtime Threads (_XOPEN_REALTIME_THREADS)
706       Advanced Realtime Threads (ADVANCED REALTIME THREADS)
707       Tracing (TRACING)
708       XSI Streams (STREAMS)
709       Legacy (_XOPEN_LEGACY)
710

SEE ALSO

712       sysconf(3), standards(7)
713

COLOPHON

715       This  page  is  part of release 5.13 of the Linux man-pages project.  A
716       description of the project, information about reporting bugs,  and  the
717       latest     version     of     this    page,    can    be    found    at
718       https://www.kernel.org/doc/man-pages/.
719
720
721
722                                  2021-08-27                   POSIXOPTIONS(7)