NAME<\/a> posixoptions \u2212 optional parts of the POSIX standard<\/p>\n The POSIX standard (the information below is from POSIX.1-2001) describes a set of behaviors and interfaces for a compliant system. However, many interfaces are optional and there are feature test macros to test the availability of interfaces at compile time, and functions sysconf<\/b>(3), fpathconf<\/b>(3), pathconf<\/b>(3), confstr<\/b>(3) to do this at run time. From shell scripts one can use getconf<\/b>(1). For more detail, see sysconf<\/b>(3).<\/p>\n We give the name of the POSIX abbreviation, the option, the name of the sysconf<\/b>(3) parameter used to inquire about the option, and possibly a very short description. Much more precise detail can be found in the POSIX standard itself, versions of which can nowadays be accessed freely on the web.<\/p>\n ADV – _POSIX_ADVISORY_INFO – _SC_ADVISORY_INFO<\/b> posix_fadvise<\/i>() AIO – _POSIX_ASYNCHRONOUS_IO – _SC_ASYNCHRONOUS_IO<\/b> aio_cancel<\/i>() BAR – _POSIX_BARRIERS – _SC_BARRIERS<\/b> pthread_barrier_destroy<\/i>() — – POSIX_CHOWN_RESTRICTED<\/b> chown<\/i>() CS – _POSIX_CLOCK_SELECTION – _SC_CLOCK_SELECTION<\/b> pthread_condattr_getclock<\/i>() If CLOCK_REALTIME<\/b> is changed by the function clock_settime<\/i>(), then this affects all timers set for an absolute time.<\/p>\n CPT – _POSIX_CPUTIME – _SC_CPUTIME<\/b> — – _POSIX_FILE_LOCKING – _SC_FILE_LOCKING<\/b> FSC – _POSIX_FSYNC – _SC_FSYNC<\/b> IP6 – _POSIX_IPV6 – _SC_IPV6<\/b> — – _POSIX_JOB_CONTROL – _SC_JOB_CONTROL<\/b> setpgid<\/i>() MF – _POSIX_MAPPED_FILES – _SC_MAPPED_FILES<\/b> mmap<\/i>() ML – _POSIX_MEMLOCK – _SC_MEMLOCK<\/b> mlockall<\/i>() MR\/MLR – _POSIX_MEMLOCK_RANGE – _SC_MEMLOCK_RANGE<\/b> mlock<\/i>() MPR – _POSIX_MEMORY_PROTECTION – _SC_MEMORY_PROTECTION<\/b> MSG – _POSIX_MESSAGE_PASSING – _SC_MESSAGE_PASSING<\/b> mq_close<\/i>() MON – _POSIX_MONOTONIC_CLOCK – _SC_MONOTONIC_CLOCK aio_suspend<\/i>() — – _POSIX_MULTI_PROCESS – _SC_MULTI_PROCESS<\/b> — – _POSIX_NO_TRUNC<\/b> PIO – _POSIX_PRIORITIZED_IO – _SC_PRIORITIZED_IO<\/b> aio_read<\/i>() PS – _POSIX_PRIORITY_SCHEDULING – _SC_PRIORITY_SCHEDULING<\/b> sched_get_priority_max<\/i>() If also _POSIX_SPAWN<\/b> is in effect, then the following functions are present:<\/p>\n posix_spawnattr_getschedparam<\/i>() RS – _POSIX_RAW_SOCKETS<\/b> getsockopt<\/i>() — – _POSIX_READER_WRITER_LOCKS – _SC_READER_WRITER_LOCKS<\/b> The following functions are present:<\/p>\n pthread_rwlock_destroy<\/i>() RTS – _POSIX_REALTIME_SIGNALS – _SC_REALTIME_SIGNALS<\/b> sigqueue<\/i>() — – _POSIX_REGEXP – _SC_REGEXP<\/b> regcomp<\/i>() — – _POSIX_SAVED_IDS – _SC_SAVED_IDS<\/b> exec<\/i>() SEM – _POSIX_SEMAPHORES – _SC_SEMAPHORES<\/b> sem_close<\/i>() SHM – _POSIX_SHARED_MEMORY_OBJECTS – _SC_SHARED_MEMORY_OBJECTS<\/b> mmap<\/i>() — – _POSIX_SHELL – _SC_SHELL<\/b> SPN – _POSIX_SPAWN – _SC_SPAWN<\/b> If _POSIX_SPAWN<\/b> is in effect, then the include file posix_spawn<\/i>() If also _POSIX_PRIORITY_SCHEDULING<\/b> is in effect, then the following functions are present:<\/p>\n posix_spawnattr_getschedparam<\/i>() SPI – _POSIX_SPIN_LOCKS – _SC_SPIN_LOCKS<\/b> pthread_spin_destroy<\/i>() SS – _POSIX_SPORADIC_SERVER – _SC_SPORADIC_SERVER<\/b> sched_setparam<\/i>() SIO – _POSIX_SYNCHRONIZED_IO – _SC_SYNCHRONIZED_IO<\/b> open<\/i>() TSA – _POSIX_THREAD_ATTR_STACKADDR – _SC_THREAD_ATTR_STACKADDR<\/b> pthread_attr_getstack<\/i>() TSS – _POSIX_THREAD_ATTR_STACKSIZE – _SC_THREAD_ATTR_STACKSIZE<\/b> pthread_attr_getstack<\/i>() TCT – _POSIX_THREAD_CPUTIME – _SC_THREAD_CPUTIME<\/b> pthread_getcpuclockid<\/i>() TPI – _POSIX_THREAD_PRIO_INHERIT – _SC_THREAD_PRIO_INHERIT<\/b> pthread_mutexattr_getprotocol<\/i>() TPP – _POSIX_THREAD_PRIO_PROTECT – _SC_THREAD_PRIO_PROTECT<\/b> pthread_mutex_getprioceiling<\/i>() TPS – _POSIX_THREAD_PRIORITY_SCHEDULING – _SC_THREAD_PRIORITY_SCHEDULING<\/b> pthread_attr_getinheritsched<\/i>() TSH – _POSIX_THREAD_PROCESS_SHARED – _SC_THREAD_PROCESS_SHARED<\/b> pthread_barrierattr_getpshared<\/i>() TSF – _POSIX_THREAD_SAFE_FUNCTIONS – _SC_THREAD_SAFE_FUNCTIONS<\/b> readdir_r<\/i>() TSP – _POSIX_THREAD_SPORADIC_SERVER – _SC_THREAD_SPORADIC_SERVER<\/b> sched_getparam<\/i>() THR – _POSIX_THREADS – _SC_THREADS<\/b> pthread_atfork<\/i>() TMO – _POSIX_TIMEOUTS – _SC_TIMEOUTS<\/b> mq_timedreceive<\/i>() TMR – _POSIX_TIMERS – _SC_TIMERS<\/b> clock_getres<\/i>() TRC – _POSIX_TRACE – _SC_TRACE<\/b> posix_trace_attr_destroy<\/i>() TEF – _POSIX_TRACE_EVENT_FILTER – _SC_TRACE_EVENT_FILTER<\/b> posix_trace_eventset_add<\/i>() TRI – _POSIX_TRACE_INHERIT – _SC_TRACE_INHERIT<\/b> posix_trace_attr_getinherited<\/i>() TRL – _POSIX_TRACE_LOG – _SC_TRACE_LOG<\/b> posix_trace_attr_getlogfullpolicy<\/i>() TYM – _POSIX_TYPED_MEMORY_OBJECTS – _SC_TYPED_MEMORY_OBJECT<\/b> posix_mem_offset<\/i>() — – _POSIX_VDISABLE<\/b> XSI – _XOPEN_CRYPT – _SC_XOPEN_CRYPT<\/b> crypt<\/i>() XSI – _XOPEN_REALTIME – _SC_XOPEN_REALTIME<\/b> ADV – — – —<\/b> (implies _POSIX_TIMERS<\/b>)<\/p>\n _POSIX_CPUTIME<\/b><\/p>\n (implies _POSIX_TIMERS<\/b>)<\/p>\n _POSIX_MONOTONIC_CLOCK<\/b><\/p>\n (implies _POSIX_TIMERS<\/b>)<\/p>\n _POSIX_SPAWN (implies _POSIX_PRIORITY_SCHEDULING<\/b>)<\/p>\n _POSIX_TIMEOUTS XSI – _XOPEN_REALTIME_THREADS – _SC_XOPEN_REALTIME_THREADS<\/b> ADVANCED REALTIME THREADS – — – —<\/b> (implies _POSIX_THREADS<\/b>, _POSIX_THREAD_SAFE_FUNCTIONS<\/b>)<\/p>\n _POSIX_SPIN_LOCKS<\/b><\/p>\n (implies _POSIX_THREADS<\/b>, _POSIX_THREAD_SAFE_FUNCTIONS<\/b>)<\/p>\n _POSIX_THREAD_CPUTIME<\/b><\/p>\n (implies _POSIX_TIMERS<\/b>)<\/p>\n _POSIX_THREAD_SPORADIC_SERVER<\/b><\/p>\n (implies _POSIX_THREAD_PRIORITY_SCHEDULING<\/b>)<\/p>\n TRACING – — – —<\/b> STREAMS – _XOPEN_STREAMS – _SC_XOPEN_STREAMS<\/b> fattach<\/i>() XSI – _XOPEN_LEGACY – _SC_XOPEN_LEGACY<\/b> bcmp<\/i>() XSI – _XOPEN_UNIX – _SC_XOPEN_UNIX<\/b> mmap<\/i>() This option implies the following options: This option may imply the following options from the XSI option groups:
DESCRIPTION<\/a>
X\/OPEN SYSTEM INTERFACE EXTENSIONS<\/a>
SEE ALSO<\/a>
COLOPHON<\/a> <\/p>\n
\nNAME <\/a> <\/h2>\n
DESCRIPTION <\/a> <\/h2>\n
The following advisory functions are present:<\/p>\n
posix_fallocate<\/i>()
posix_memalign<\/i>()
posix_madvise<\/i>()<\/p>\n
The header
aio_error<\/i>()
aio_fsync<\/i>()
aio_read<\/i>()
aio_return<\/i>()
aio_suspend<\/i>()
aio_write<\/i>()
lio_listio<\/i>()<\/p>\n
This option implies the _POSIX_THREADS<\/b> and _POSIX_THREAD_SAFE_FUNCTIONS<\/b> options. The following functions are present:<\/p>\n
pthread_barrier_init<\/i>()
pthread_barrier_wait<\/i>()
pthread_barrierattr_destroy<\/i>()
pthread_barrierattr_init<\/i>()<\/p>\n
If this option is in effect (as it always is under POSIX.1-2001), then only root may change the owner of a file, and nonroot can set the group of a file only to one of the groups it belongs to. This affects the following functions<\/p>\n
fchown<\/i>()<\/p>\n
This option implies the _POSIX_TIMERS<\/b> option. The following functions are present:<\/p>\n
pthread_condattr_setclock<\/i>()
clock_nanosleep<\/i>()<\/p>\n
The CLOCK_PROCESS_CPUTIME_ID<\/b> clock ID is supported. The initial value of this clock is 0 for each process. This option implies the _POSIX_TIMERS<\/b> option. The function clock_getcpuclockid<\/i>() is present.<\/p>\n
This option has been deleted. Not in final XPG6.<\/p>\n
The function fsync<\/i>() is present.<\/p>\n
Internet Protocol Version 6 is supported.<\/p>\n
If this option is in effect (as it always is under POSIX.1-2001), then the system implements POSIX-style job control, and the following functions are present:<\/p>\n
tcdrain<\/i>()
tcflush<\/i>()
tcgetpgrp<\/i>()
tcsendbreak<\/i>()
tcsetattr<\/i>()
tcsetpgrp<\/i>()<\/p>\n
Shared memory is supported. The include file
msync<\/i>()
munmap<\/i>()<\/p>\n
Shared memory can be locked into core. The following functions are present:<\/p>\n
munlockall<\/i>()<\/p>\n
More precisely, ranges can be locked into core. The following functions are present:<\/p>\n
munlock<\/i>()<\/p>\n
The function mprotect<\/i>() is present.<\/p>\n
The include file
mq_getattr<\/i>()
mq_notify<\/i>()
mq_open<\/i>()
mq_receive<\/i>()
mq_send<\/i>()
mq_setattr<\/i>()
mq_unlink<\/i>()<\/p>\n
CLOCK_MONOTONIC<\/b> is supported. This option implies the _POSIX_TIMERS<\/b> option. The following functions are affected:<\/p>\n
clock_getres<\/i>()
clock_gettime<\/i>()
clock_settime<\/i>()
timer_create<\/i>()<\/p>\n
This option has been deleted. Not in final XPG6.<\/p>\n
If this option is in effect (as it always is under POSIX.1-2001), then pathname components longer than NAME_MAX<\/b> are not truncated, but give an error. This property may be dependent on the path prefix of the component.<\/p>\n
This option says that one can specify priorities for asynchronous I\/O. This affects the functions<\/p>\n
aio_write<\/i>()<\/p>\n
The include file
sched_get_priority_min<\/i>()
sched_getparam<\/i>()
sched_getscheduler<\/i>()
sched_rr_get_interval<\/i>()
sched_setparam<\/i>()
sched_setscheduler<\/i>()
sched_yield<\/i>()<\/p>\n
posix_spawnattr_getschedpolicy<\/i>()
posix_spawnattr_setschedparam<\/i>()
posix_spawnattr_setschedpolicy<\/i>()<\/p>\n
Raw sockets are supported. The following functions are affected:<\/p>\n
setsockopt<\/i>()<\/p>\n
This option implies the _POSIX_THREADS<\/b> option. Conversely, under POSIX.1-2001 the _POSIX_THREADS<\/b> option implies this option.<\/p>\n
pthread_rwlock_init<\/i>()
pthread_rwlock_rdlock<\/i>()
pthread_rwlock_tryrdlock<\/i>()
pthread_rwlock_trywrlock<\/i>()
pthread_rwlock_unlock<\/i>()
pthread_rwlock_wrlock<\/i>()
pthread_rwlockattr_destroy<\/i>()
pthread_rwlockattr_init<\/i>()<\/p>\n
Realtime signals are supported. The following functions are present:<\/p>\n
sigtimedwait<\/i>()
sigwaitinfo<\/i>()<\/p>\n
If this option is in effect (as it always is under POSIX.1-2001), then POSIX regular expressions are supported and the following functions are present:<\/p>\n
regerror<\/i>()
regexec<\/i>()
regfree<\/i>()<\/p>\n
If this option is in effect (as it always is under POSIX.1-2001), then a process has a saved set-user-ID and a saved set-group-ID. The following functions are affected:<\/p>\n
kill<\/i>()
seteuid<\/i>()
setegid<\/i>()
setgid<\/i>()
setuid<\/i>()<\/p>\n
The include file
sem_destroy<\/i>()
sem_getvalue<\/i>()
sem_init<\/i>()
sem_open<\/i>()
sem_post<\/i>()
sem_trywait<\/i>()
sem_unlink<\/i>()
sem_wait<\/i>()<\/p>\n
The following functions are present:<\/p>\n
munmap<\/i>()
shm_open<\/i>()
shm_unlink<\/i>()<\/p>\n
If this option is in effect (as it always is under POSIX.1-2001), the function system<\/i>() is present.<\/p>\n
This option describes support for process creation in a context where it is difficult or impossible to use fork<\/i>(), for example, because no MMU is present.<\/p>\n
posix_spawn_file_actions_addclose<\/i>()
posix_spawn_file_actions_adddup2<\/i>()
posix_spawn_file_actions_addopen<\/i>()
posix_spawn_file_actions_destroy<\/i>()
posix_spawn_file_actions_init<\/i>()
posix_spawnattr_destroy<\/i>()
posix_spawnattr_getsigdefault<\/i>()
posix_spawnattr_getflags<\/i>()
posix_spawnattr_getpgroup<\/i>()
posix_spawnattr_getsigmask<\/i>()
posix_spawnattr_init<\/i>()
posix_spawnattr_setsigdefault<\/i>()
posix_spawnattr_setflags<\/i>()
posix_spawnattr_setpgroup<\/i>()
posix_spawnattr_setsigmask<\/i>()
posix_spawnp<\/i>()<\/p>\n
posix_spawnattr_getschedpolicy<\/i>()
posix_spawnattr_setschedparam<\/i>()
posix_spawnattr_setschedpolicy<\/i>()<\/p>\n
This option implies the _POSIX_THREADS<\/b> and _POSIX_THREAD_SAFE_FUNCTIONS<\/b> options. The following functions are present:<\/p>\n
pthread_spin_init<\/i>()
pthread_spin_lock<\/i>()
pthread_spin_trylock<\/i>()
pthread_spin_unlock<\/i>()<\/p>\n
The scheduling policy SCHED_SPORADIC<\/b> is supported. This option implies the _POSIX_PRIORITY_SCHEDULING<\/b> option. The following functions are affected:<\/p>\n
sched_setscheduler<\/i>()<\/p>\n
The following functions are affected:<\/p>\n
msync<\/i>()
fsync<\/i>()
fdatasync<\/i>()<\/p>\n
The following functions are affected:<\/p>\n
pthread_attr_getstackaddr<\/i>()
pthread_attr_setstack<\/i>()
pthread_attr_setstackaddr<\/i>()<\/p>\n
The following functions are affected:<\/p>\n
pthread_attr_getstacksize<\/i>()
pthread_attr_setstack<\/i>()
pthread_attr_setstacksize<\/i>()<\/p>\n
The clockID CLOCK_THREAD_CPUTIME_ID is supported. This option implies the _POSIX_TIMERS<\/b> option. The following functions are affected:<\/p>\n
clock_getres<\/i>()
clock_gettime<\/i>()
clock_settime<\/i>()
timer_create<\/i>()<\/p>\n
The following functions are affected:<\/p>\n
pthread_mutexattr_setprotocol<\/i>()<\/p>\n
The following functions are affected:<\/p>\n
pthread_mutex_setprioceiling<\/i>()
pthread_mutexattr_getprioceiling<\/i>()
pthread_mutexattr_getprotocol<\/i>()
pthread_mutexattr_setprioceiling<\/i>()
pthread_mutexattr_setprotocol<\/i>()<\/p>\n
If this option is in effect, the different threads inside a process can run with different priorities and\/or different schedulers. The following functions are affected:<\/p>\n
pthread_attr_getschedpolicy<\/i>()
pthread_attr_getscope<\/i>()
pthread_attr_setinheritsched<\/i>()
pthread_attr_setschedpolicy<\/i>()
pthread_attr_setscope<\/i>()
pthread_getschedparam<\/i>()
pthread_setschedparam<\/i>()
pthread_setschedprio<\/i>()<\/p>\n
The following functions are affected:<\/p>\n
pthread_barrierattr_setpshared<\/i>()
pthread_condattr_getpshared<\/i>()
pthread_condattr_setpshared<\/i>()
pthread_mutexattr_getpshared<\/i>()
pthread_mutexattr_setpshared<\/i>()
pthread_rwlockattr_getpshared<\/i>()
pthread_rwlockattr_setpshared<\/i>()<\/p>\n
The following functions are affected:<\/p>\n
getgrgid_r<\/i>()
getgrnam_r<\/i>()
getpwnam_r<\/i>()
getpwuid_r<\/i>()
flockfile<\/i>()
ftrylockfile<\/i>()
funlockfile<\/i>()
getc_unlocked<\/i>()
getchar_unlocked<\/i>()
putc_unlocked<\/i>()
putchar_unlocked<\/i>()
rand_r<\/i>()
strerror_r<\/i>()
strtok_r<\/i>()
asctime_r<\/i>()
ctime_r<\/i>()
gmtime_r<\/i>()
localtime_r<\/i>()<\/p>\n
This option implies the _POSIX_THREAD_PRIORITY_SCHEDULING<\/b> option. The following functions are affected:<\/p>\n
sched_setparam<\/i>()
sched_setscheduler<\/i>()<\/p>\n
Basic support for POSIX threads is available. The following functions are present:<\/p>\n
pthread_attr_destroy<\/i>()
pthread_attr_getdetachstate<\/i>()
pthread_attr_getschedparam<\/i>()
pthread_attr_init<\/i>()
pthread_attr_setdetachstate<\/i>()
pthread_attr_setschedparam<\/i>()
pthread_cancel<\/i>()
pthread_cleanup_push<\/i>()
pthread_cleanup_pop<\/i>()
pthread_cond_broadcast<\/i>()
pthread_cond_destroy<\/i>()
pthread_cond_init<\/i>()
pthread_cond_signal<\/i>()
pthread_cond_timedwait<\/i>()
pthread_cond_wait<\/i>()
pthread_condattr_destroy<\/i>()
pthread_condattr_init<\/i>()
pthread_create<\/i>()
pthread_detach<\/i>()
pthread_equal<\/i>()
pthread_exit<\/i>()
pthread_getspecific<\/i>()
pthread_join<\/i>()
pthread_key_create<\/i>()
pthread_key_delete<\/i>()
pthread_mutex_destroy<\/i>()
pthread_mutex_init<\/i>()
pthread_mutex_lock<\/i>()
pthread_mutex_trylock<\/i>()
pthread_mutex_unlock<\/i>()
pthread_mutexattr_destroy<\/i>()
pthread_mutexattr_init<\/i>()
pthread_once<\/i>()
pthread_rwlock_destroy<\/i>()
pthread_rwlock_init<\/i>()
pthread_rwlock_rdlock<\/i>()
pthread_rwlock_tryrdlock<\/i>()
pthread_rwlock_trywrlock<\/i>()
pthread_rwlock_unlock<\/i>()
pthread_rwlock_wrlock<\/i>()
pthread_rwlockattr_destroy<\/i>()
pthread_rwlockattr_init<\/i>()
pthread_self<\/i>()
pthread_setcancelstate<\/i>()
pthread_setcanceltype<\/i>()
pthread_setspecific<\/i>()
pthread_testcancel<\/i>()<\/p>\n
The following functions are present:<\/p>\n
mq_timedsend<\/i>()
pthread_mutex_timedlock<\/i>()
pthread_rwlock_timedrdlock<\/i>()
pthread_rwlock_timedwrlock<\/i>()
sem_timedwait<\/i>()
posix_trace_timedgetnext_event<\/i>()<\/p>\n
The following functions are present:<\/p>\n
clock_gettime<\/i>()
clock_settime<\/i>()
nanosleep<\/i>()
timer_create<\/i>()
timer_delete<\/i>()
timer_gettime<\/i>()
timer_getoverrun<\/i>()
timer_settime<\/i>()<\/p>\n
POSIX tracing is available. The following functions are present:<\/p>\n
posix_trace_attr_getclockres<\/i>()
posix_trace_attr_getcreatetime<\/i>()
posix_trace_attr_getgenversion<\/i>()
posix_trace_attr_getmaxdatasize<\/i>()
posix_trace_attr_getmaxsystemeventsize<\/i>()
posix_trace_attr_getmaxusereventsize<\/i>()
posix_trace_attr_getname<\/i>()
posix_trace_attr_getstreamfullpolicy<\/i>()
posix_trace_attr_getstreamsize<\/i>()
posix_trace_attr_init<\/i>()
posix_trace_attr_setmaxdatasize<\/i>()
posix_trace_attr_setname<\/i>()
posix_trace_attr_setstreamsize<\/i>()
posix_trace_attr_setstreamfullpolicy<\/i>()
posix_trace_clear<\/i>()
posix_trace_create<\/i>()
posix_trace_event<\/i>()
posix_trace_eventid_equal<\/i>()
posix_trace_eventid_get_name<\/i>()
posix_trace_eventid_open<\/i>()
posix_trace_eventtypelist_getnext_id<\/i>()
posix_trace_eventtypelist_rewind<\/i>()
posix_trace_flush<\/i>()
posix_trace_get_attr<\/i>()
posix_trace_get_status<\/i>()
posix_trace_getnext_event<\/i>()
posix_trace_shutdown<\/i>()
posix_trace_start<\/i>()
posix_trace_stop<\/i>()
posix_trace_trygetnext_event<\/i>()<\/p>\n
This option implies the _POSIX_TRACE<\/b> option. The following functions are present:<\/p>\n
posix_trace_eventset_del<\/i>()
posix_trace_eventset_empty<\/i>()
posix_trace_eventset_fill<\/i>()
posix_trace_eventset_ismember<\/i>()
posix_trace_get_filter<\/i>()
posix_trace_set_filter<\/i>()
posix_trace_trid_eventid_open<\/i>()<\/p>\n
Tracing children of the traced process is supported. This option implies the _POSIX_TRACE<\/b> option. The following functions are present:<\/p>\n
posix_trace_attr_setinherited<\/i>()<\/p>\n
This option implies the _POSIX_TRACE<\/b> option. The following functions are present:<\/p>\n
posix_trace_attr_getlogsize<\/i>()
posix_trace_attr_setlogfullpolicy<\/i>()
posix_trace_attr_setlogsize<\/i>()
posix_trace_close<\/i>()
posix_trace_create_withlog<\/i>()
posix_trace_open<\/i>()
posix_trace_rewind<\/i>()<\/p>\n
The following functions are present:<\/p>\n
posix_typed_mem_get_info<\/i>()
posix_typed_mem_open<\/i>()<\/p>\n
Always present (probably 0). Value to set a changeable special control character to indicate that it is disabled.<\/p>\nX\/OPEN SYSTEM INTERFACE EXTENSIONS <\/a> <\/h2>\n
The following functions are present:<\/p>\n
encrypt<\/i>()
setkey<\/i>()<\/p>\n
This option implies the following options:
_POSIX_ASYNCHRONOUS_IO<\/b>==200112L
_POSIX_FSYNC
_POSIX_MAPPED_FILES
_POSIX_MEMLOCK<\/b>==200112L
_POSIX_MEMLOCK_RANGE<\/b>==200112L
_POSIX_MEMORY_PROTECTION
_POSIX_MESSAGE_PASSING<\/b>==200112L
_POSIX_PRIORITIZED_IO
_POSIX_PRIORITY_SCHEDULING<\/b>==200112L
_POSIX_REALTIME_SIGNALS<\/b>==200112L
_POSIX_SEMAPHORES<\/b>==200112L
_POSIX_SHARED_MEMORY_OBJECTS<\/b>==200112L
_POSIX_SYNCHRONIZED_IO<\/b>==200112L
_POSIX_TIMERS<\/b>==200112L<\/b><\/p>\n
The Advanced Realtime option group implies that the following options are all defined to 200112L:
_POSIX_ADVISORY_INFO
_POSIX_CLOCK_SELECTION<\/b><\/p>\n
_POSIX_SPORADIC_SERVER<\/b><\/p>\n
_POSIX_TYPED_MEMORY_OBJECTS<\/b><\/p>\n
This option implies that the following options are all defined to 200112L:
_POSIX_THREAD_PRIO_INHERIT
_POSIX_THREAD_PRIO_PROTECT
_POSIX_THREAD_PRIORITY_SCHEDULING<\/b><\/p>\n
This option implies that the following options are all defined to 200112L:
_POSIX_BARRIERS<\/b><\/p>\n
This option implies that the following options are all defined to 200112L:
_POSIX_TRACE
_POSIX_TRACE_EVENT_FILTER
_POSIX_TRACE_LOG
_POSIX_TRACE_INHERIT<\/b><\/p>\n
The following functions are present:<\/p>\n
fdetach<\/i>()
getmsg<\/i>()
getpmsg<\/i>()
ioctl<\/i>()
isastream<\/i>()
putmsg<\/i>()
putpmsg<\/i>()<\/p>\n
Functions included in the legacy option group were previously mandatory, but are now optional in this version. The following functions are present:<\/p>\n
bcopy<\/i>()
bzero<\/i>()
ecvt<\/i>()
fcvt<\/i>()
ftime<\/i>()
gcvt<\/i>()
getcwd<\/i>()
index<\/i>()
mktemp<\/i>()
rindex<\/i>()
utimes<\/i>()
wcswcs<\/i>()<\/p>\n
The following functions are present:<\/p>\n
munmap<\/i>()
msync<\/i>()<\/p>\n
_POSIX_FSYNC
_POSIX_MAPPED_FILES
_POSIX_MEMORY_PROTECTION
_POSIX_THREAD_ATTR_STACKADDR
_POSIX_THREAD_ATTR_STACKSIZE
_POSIX_THREAD_PROCESS_SHARED
_POSIX_THREAD_SAFE_FUNCTIONS
_POSIX_THREADS<\/b><\/p>\n
Encryption (_XOPEN_CRYPT<\/b>)
Realtime (_XOPEN_REALTIME<\/b>)
Advanced Realtime (ADB<\/b>)
Realtime Threads (_XOPEN_REALTIME_THREADS<\/b>)
Advanced Realtime Threads (ADVANCED REALTIME THREADS<\/b>)
Tracing (TRACING<\/b>)
XSI Streams (STREAMS<\/b>)
Legacy (_XOPEN_LEGACY<\/b>)<\/p>\nSEE ALSO <\/a> <\/h2>\n