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-.\" Copyright (c) 2003 Andries Brouwer (aeb@cwi.nl)
-.\"
-.\" SPDX-License-Identifier: GPL-2.0-or-later
-.\"
-.TH posixoptions 7 2023-11-01 "Linux man-pages 6.7"
-.SH NAME
-posixoptions \- optional parts of the POSIX standard
-.SH DESCRIPTION
-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
-.BR sysconf (3),
-.BR fpathconf (3),
-.BR pathconf (3),
-.BR confstr (3)
-to do this at run time.
-From shell scripts one can use
-.BR getconf (1).
-For more detail, see
-.BR sysconf (3).
-.P
-We give the name of the POSIX abbreviation, the option, the name of the
-.BR sysconf (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.
-.SS ADV - _POSIX_ADVISORY_INFO - _SC_ADVISORY_INFO
-The following advisory functions are present:
-.P
-.nf
-.in +4n
-.IR posix_fadvise ()
-.IR posix_fallocate ()
-.IR posix_memalign ()
-.IR posix_madvise ()
-.in
-.fi
-.SS AIO - _POSIX_ASYNCHRONOUS_IO - _SC_ASYNCHRONOUS_IO
-The header
-.I <aio.h>
-is present.
-The following functions are present:
-.P
-.nf
-.in +4n
-.IR aio_cancel ()
-.IR aio_error ()
-.IR aio_fsync ()
-.IR aio_read ()
-.IR aio_return ()
-.IR aio_suspend ()
-.IR aio_write ()
-.IR lio_listio ()
-.in
-.fi
-.SS BAR - _POSIX_BARRIERS - _SC_BARRIERS
-This option implies the
-.B _POSIX_THREADS
-and
-.B _POSIX_THREAD_SAFE_FUNCTIONS
-options.
-The following functions are present:
-.P
-.nf
-.in +4n
-.IR pthread_barrier_destroy ()
-.IR pthread_barrier_init ()
-.IR pthread_barrier_wait ()
-.IR pthread_barrierattr_destroy ()
-.IR pthread_barrierattr_init ()
-.in
-.fi
-.\" .SS BE
-.\" Batch environment.
-.\" .SS CD
-.\" C development.
-.SS --- - POSIX_CHOWN_RESTRICTED
-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
-.nf
-.in +4n
-.IR chown ()
-.IR fchown ()
-.in
-.fi
-.\" What about lchown() ?
-.SS CS - _POSIX_CLOCK_SELECTION - _SC_CLOCK_SELECTION
-This option implies the
-.B _POSIX_TIMERS
-option.
-The following functions are present:
-.P
-.nf
-.in +4n
-.IR pthread_condattr_getclock ()
-.IR pthread_condattr_setclock ()
-.IR clock_nanosleep ()
-.in
-.fi
-.P
-If
-.B CLOCK_REALTIME
-is changed by the function
-.IR clock_settime (),
-then this affects all timers set for an absolute time.
-.SS CPT - _POSIX_CPUTIME - _SC_CPUTIME
-The
-.B CLOCK_PROCESS_CPUTIME_ID
-clock ID is supported.
-The initial value of this clock is 0 for each process.
-This option implies the
-.B _POSIX_TIMERS
-option.
-The function
-.IR clock_getcpuclockid ()
-is present.
-.\" .SS FD
-.\" Fortran development
-.\" .SS FR
-.\" Fortran runtime
-.SS --- - _POSIX_FILE_LOCKING - _SC_FILE_LOCKING
-This option has been deleted.
-Not in final XPG6.
-.SS FSC - _POSIX_FSYNC - _SC_FSYNC
-The function
-.IR fsync ()
-is present.
-.SS IP6 - _POSIX_IPV6 - _SC_IPV6
-Internet Protocol Version 6 is supported.
-.SS --- - _POSIX_JOB_CONTROL - _SC_JOB_CONTROL
-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
-.nf
-.in +4n
-.IR setpgid ()
-.IR tcdrain ()
-.IR tcflush ()
-.IR tcgetpgrp ()
-.IR tcsendbreak ()
-.IR tcsetattr ()
-.IR tcsetpgrp ()
-.in
-.fi
-.SS MF - _POSIX_MAPPED_FILES - _SC_MAPPED_FILES
-Shared memory is supported.
-The include file
-.I <sys/mman.h>
-is present.
-The following functions are present:
-.P
-.nf
-.in +4n
-.IR mmap ()
-.IR msync ()
-.IR munmap ()
-.in
-.fi
-.SS ML - _POSIX_MEMLOCK - _SC_MEMLOCK
-Shared memory can be locked into core.
-The following functions are present:
-.P
-.nf
-.in +4n
-.IR mlockall ()
-.IR munlockall ()
-.in
-.fi
-.SS MR/MLR - _POSIX_MEMLOCK_RANGE - _SC_MEMLOCK_RANGE
-More precisely, ranges can be locked into core.
-The following functions are present:
-.P
-.nf
-.in +4n
-.IR mlock ()
-.IR munlock ()
-.in
-.fi
-.SS MPR - _POSIX_MEMORY_PROTECTION - _SC_MEMORY_PROTECTION
-The function
-.IR mprotect ()
-is present.
-.SS MSG - _POSIX_MESSAGE_PASSING - _SC_MESSAGE_PASSING
-The include file
-.I <mqueue.h>
-is present.
-The following functions are present:
-.P
-.nf
-.in +4n
-.IR mq_close ()
-.IR mq_getattr ()
-.IR mq_notify ()
-.IR mq_open ()
-.IR mq_receive ()
-.IR mq_send ()
-.IR mq_setattr ()
-.IR mq_unlink ()
-.in
-.fi
-.SS MON - _POSIX_MONOTONIC_CLOCK - _SC_MONOTONIC_CLOCK
-.B CLOCK_MONOTONIC
-is supported.
-This option implies the
-.B _POSIX_TIMERS
-option.
-The following functions are affected:
-.P
-.nf
-.in +4n
-.IR aio_suspend ()
-.IR clock_getres ()
-.IR clock_gettime ()
-.IR clock_settime ()
-.IR timer_create ()
-.in
-.fi
-.SS --- - _POSIX_MULTI_PROCESS - _SC_MULTI_PROCESS
-This option has been deleted.
-Not in final XPG6.
-.\" .SS MX
-.\" IEC 60559 Floating-Point Option.
-.SS --- - _POSIX_NO_TRUNC
-If this option is in effect (as it always is under POSIX.1-2001),
-then pathname components longer than
-.B NAME_MAX
-are not truncated,
-but give an error.
-This property may be dependent on the path prefix of the component.
-.SS PIO - _POSIX_PRIORITIZED_IO - _SC_PRIORITIZED_IO
-This option says that one can specify priorities for asynchronous I/O.
-This affects the functions
-.P
-.nf
-.in +4n
-.IR aio_read ()
-.IR aio_write ()
-.in
-.fi
-.SS PS - _POSIX_PRIORITY_SCHEDULING - _SC_PRIORITY_SCHEDULING
-The include file
-.I <sched.h>
-is present.
-The following functions are present:
-.P
-.nf
-.in +4n
-.IR sched_get_priority_max ()
-.IR sched_get_priority_min ()
-.IR sched_getparam ()
-.IR sched_getscheduler ()
-.IR sched_rr_get_interval ()
-.IR sched_setparam ()
-.IR sched_setscheduler ()
-.IR sched_yield ()
-.in
-.fi
-.P
-If also
-.B _POSIX_SPAWN
-is in effect, then the following functions are present:
-.P
-.nf
-.in +4n
-.IR posix_spawnattr_getschedparam ()
-.IR posix_spawnattr_getschedpolicy ()
-.IR posix_spawnattr_setschedparam ()
-.IR posix_spawnattr_setschedpolicy ()
-.in
-.fi
-.SS RS - _POSIX_RAW_SOCKETS
-Raw sockets are supported.
-The following functions are affected:
-.P
-.nf
-.in +4n
-.IR getsockopt ()
-.IR setsockopt ()
-.in
-.fi
-.SS --- - _POSIX_READER_WRITER_LOCKS - _SC_READER_WRITER_LOCKS
-This option implies the
-.B _POSIX_THREADS
-option.
-Conversely,
-under POSIX.1-2001 the
-.B _POSIX_THREADS
-option implies this option.
-.P
-The following functions are present:
-.P
-.in +4n
-.nf
-.IR pthread_rwlock_destroy ()
-.IR pthread_rwlock_init ()
-.IR pthread_rwlock_rdlock ()
-.IR pthread_rwlock_tryrdlock ()
-.IR pthread_rwlock_trywrlock ()
-.IR pthread_rwlock_unlock ()
-.IR pthread_rwlock_wrlock ()
-.IR pthread_rwlockattr_destroy ()
-.IR pthread_rwlockattr_init ()
-.in
-.fi
-.SS RTS - _POSIX_REALTIME_SIGNALS - _SC_REALTIME_SIGNALS
-Realtime signals are supported.
-The following functions are present:
-.P
-.nf
-.in +4n
-.IR sigqueue ()
-.IR sigtimedwait ()
-.IR sigwaitinfo ()
-.in
-.fi
-.SS --- - _POSIX_REGEXP - _SC_REGEXP
-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
-.nf
-.in +4n
-.IR regcomp ()
-.IR regerror ()
-.IR regexec ()
-.IR regfree ()
-.in
-.fi
-.SS --- - _POSIX_SAVED_IDS - _SC_SAVED_IDS
-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
-.nf
-.in +4n
-.IR exec ()
-.IR kill ()
-.IR seteuid ()
-.IR setegid ()
-.IR setgid ()
-.IR setuid ()
-.in
-.fi
-.\" .SS SD
-.\" Software development
-.SS SEM - _POSIX_SEMAPHORES - _SC_SEMAPHORES
-The include file
-.I <semaphore.h>
-is present.
-The following functions are present:
-.P
-.nf
-.in +4n
-.IR sem_close ()
-.IR sem_destroy ()
-.IR sem_getvalue ()
-.IR sem_init ()
-.IR sem_open ()
-.IR sem_post ()
-.IR sem_trywait ()
-.IR sem_unlink ()
-.IR sem_wait ()
-.in
-.fi
-.SS SHM - _POSIX_SHARED_MEMORY_OBJECTS - _SC_SHARED_MEMORY_OBJECTS
-The following functions are present:
-.P
-.nf
-.in +4n
-.IR mmap ()
-.IR munmap ()
-.IR shm_open ()
-.IR shm_unlink ()
-.in
-.fi
-.SS --- - _POSIX_SHELL - _SC_SHELL
-If this option is in effect (as it always is under POSIX.1-2001),
-the function
-.IR system ()
-is present.
-.SS SPN - _POSIX_SPAWN - _SC_SPAWN
-This option describes support for process creation in a context where
-it is difficult or impossible to use
-.IR fork (),
-for example, because no MMU is present.
-.P
-If
-.B _POSIX_SPAWN
-is in effect, then the include file
-.I <spawn.h>
-and the following functions are present:
-.P
-.nf
-.in +4n
-.IR posix_spawn ()
-.IR posix_spawn_file_actions_addclose ()
-.IR posix_spawn_file_actions_adddup2 ()
-.IR posix_spawn_file_actions_addopen ()
-.IR posix_spawn_file_actions_destroy ()
-.IR posix_spawn_file_actions_init ()
-.IR posix_spawnattr_destroy ()
-.IR posix_spawnattr_getsigdefault ()
-.IR posix_spawnattr_getflags ()
-.IR posix_spawnattr_getpgroup ()
-.IR posix_spawnattr_getsigmask ()
-.IR posix_spawnattr_init ()
-.IR posix_spawnattr_setsigdefault ()
-.IR posix_spawnattr_setflags ()
-.IR posix_spawnattr_setpgroup ()
-.IR posix_spawnattr_setsigmask ()
-.IR posix_spawnp ()
-.in
-.fi
-.P
-If also
-.B _POSIX_PRIORITY_SCHEDULING
-is in effect, then
-the following functions are present:
-.P
-.nf
-.in +4n
-.IR posix_spawnattr_getschedparam ()
-.IR posix_spawnattr_getschedpolicy ()
-.IR posix_spawnattr_setschedparam ()
-.IR posix_spawnattr_setschedpolicy ()
-.in
-.fi
-.SS SPI - _POSIX_SPIN_LOCKS - _SC_SPIN_LOCKS
-This option implies the
-.B _POSIX_THREADS
-and
-.B _POSIX_THREAD_SAFE_FUNCTIONS
-options.
-The following functions are present:
-.P
-.nf
-.in +4n
-.IR pthread_spin_destroy ()
-.IR pthread_spin_init ()
-.IR pthread_spin_lock ()
-.IR pthread_spin_trylock ()
-.IR pthread_spin_unlock ()
-.in -4n
-.fi
-.SS SS - _POSIX_SPORADIC_SERVER - _SC_SPORADIC_SERVER
-The scheduling policy
-.B SCHED_SPORADIC
-is supported.
-This option implies the
-.B _POSIX_PRIORITY_SCHEDULING
-option.
-The following functions are affected:
-.P
-.nf
-.in +4n
-.IR sched_setparam ()
-.IR sched_setscheduler ()
-.in
-.fi
-.SS SIO - _POSIX_SYNCHRONIZED_IO - _SC_SYNCHRONIZED_IO
-The following functions are affected:
-.P
-.nf
-.in +4n
-.IR open ()
-.IR msync ()
-.IR fsync ()
-.IR fdatasync ()
-.in
-.fi
-.SS TSA - _POSIX_THREAD_ATTR_STACKADDR - _SC_THREAD_ATTR_STACKADDR
-The following functions are affected:
-.P
-.nf
-.in +4n
-.IR pthread_attr_getstack ()
-.IR pthread_attr_getstackaddr ()
-.IR pthread_attr_setstack ()
-.IR pthread_attr_setstackaddr ()
-.in
-.fi
-.SS TSS - _POSIX_THREAD_ATTR_STACKSIZE - _SC_THREAD_ATTR_STACKSIZE
-The following functions are affected:
-.P
-.nf
-.in +4n
-.IR pthread_attr_getstack ()
-.IR pthread_attr_getstacksize ()
-.IR pthread_attr_setstack ()
-.IR pthread_attr_setstacksize ()
-.in
-.fi
-.SS TCT - _POSIX_THREAD_CPUTIME - _SC_THREAD_CPUTIME
-The clockID CLOCK_THREAD_CPUTIME_ID is supported.
-This option implies the
-.B _POSIX_TIMERS
-option.
-The following functions are affected:
-.P
-.nf
-.in +4n
-.IR pthread_getcpuclockid ()
-.IR clock_getres ()
-.IR clock_gettime ()
-.IR clock_settime ()
-.IR timer_create ()
-.in
-.fi
-.SS TPI - _POSIX_THREAD_PRIO_INHERIT - _SC_THREAD_PRIO_INHERIT
-The following functions are affected:
-.P
-.nf
-.in +4n
-.IR pthread_mutexattr_getprotocol ()
-.IR pthread_mutexattr_setprotocol ()
-.in
-.fi
-.SS TPP - _POSIX_THREAD_PRIO_PROTECT - _SC_THREAD_PRIO_PROTECT
-The following functions are affected:
-.P
-.nf
-.in +4n
-.IR pthread_mutex_getprioceiling ()
-.IR pthread_mutex_setprioceiling ()
-.IR pthread_mutexattr_getprioceiling ()
-.IR pthread_mutexattr_getprotocol ()
-.IR pthread_mutexattr_setprioceiling ()
-.IR pthread_mutexattr_setprotocol ()
-.in
-.fi
-.SS TPS - _POSIX_THREAD_PRIORITY_SCHEDULING - _SC_THREAD_PRIORITY_SCHEDULING
-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
-.nf
-.in +4n
-.IR pthread_attr_getinheritsched ()
-.IR pthread_attr_getschedpolicy ()
-.IR pthread_attr_getscope ()
-.IR pthread_attr_setinheritsched ()
-.IR pthread_attr_setschedpolicy ()
-.IR pthread_attr_setscope ()
-.IR pthread_getschedparam ()
-.IR pthread_setschedparam ()
-.IR pthread_setschedprio ()
-.in
-.fi
-.SS TSH - _POSIX_THREAD_PROCESS_SHARED - _SC_THREAD_PROCESS_SHARED
-The following functions are affected:
-.P
-.nf
-.in +4n
-.IR pthread_barrierattr_getpshared ()
-.IR pthread_barrierattr_setpshared ()
-.IR pthread_condattr_getpshared ()
-.IR pthread_condattr_setpshared ()
-.IR pthread_mutexattr_getpshared ()
-.IR pthread_mutexattr_setpshared ()
-.IR pthread_rwlockattr_getpshared ()
-.IR pthread_rwlockattr_setpshared ()
-.in
-.fi
-.SS TSF - _POSIX_THREAD_SAFE_FUNCTIONS - _SC_THREAD_SAFE_FUNCTIONS
-The following functions are affected:
-.P
-.nf
-.in +4n
-.IR readdir_r ()
-.IR getgrgid_r ()
-.IR getgrnam_r ()
-.IR getpwnam_r ()
-.IR getpwuid_r ()
-.IR flockfile ()
-.IR ftrylockfile ()
-.IR funlockfile ()
-.IR getc_unlocked ()
-.IR getchar_unlocked ()
-.IR putc_unlocked ()
-.IR putchar_unlocked ()
-.IR rand_r ()
-.IR strerror_r ()
-.IR strtok_r ()
-.IR asctime_r ()
-.IR ctime_r ()
-.IR gmtime_r ()
-.IR localtime_r ()
-.in
-.fi
-.SS TSP - _POSIX_THREAD_SPORADIC_SERVER - _SC_THREAD_SPORADIC_SERVER
-This option implies the
-.B _POSIX_THREAD_PRIORITY_SCHEDULING
-option.
-The following functions are affected:
-.P
-.nf
-.in +4n
-.IR sched_getparam ()
-.IR sched_setparam ()
-.IR sched_setscheduler ()
-.in
-.fi
-.SS THR - _POSIX_THREADS - _SC_THREADS
-Basic support for POSIX threads is available.
-The following functions are present:
-.P
-.nf
-.in +4n
-.IR pthread_atfork ()
-.IR pthread_attr_destroy ()
-.IR pthread_attr_getdetachstate ()
-.IR pthread_attr_getschedparam ()
-.IR pthread_attr_init ()
-.IR pthread_attr_setdetachstate ()
-.IR pthread_attr_setschedparam ()
-.IR pthread_cancel ()
-.IR pthread_cleanup_push ()
-.IR pthread_cleanup_pop ()
-.IR pthread_cond_broadcast ()
-.IR pthread_cond_destroy ()
-.IR pthread_cond_init ()
-.IR pthread_cond_signal ()
-.IR pthread_cond_timedwait ()
-.IR pthread_cond_wait ()
-.IR pthread_condattr_destroy ()
-.IR pthread_condattr_init ()
-.IR pthread_create ()
-.IR pthread_detach ()
-.IR pthread_equal ()
-.IR pthread_exit ()
-.IR pthread_getspecific ()
-.IR pthread_join ()
-.IR pthread_key_create ()
-.IR pthread_key_delete ()
-.IR pthread_mutex_destroy ()
-.IR pthread_mutex_init ()
-.IR pthread_mutex_lock ()
-.IR pthread_mutex_trylock ()
-.IR pthread_mutex_unlock ()
-.IR pthread_mutexattr_destroy ()
-.IR pthread_mutexattr_init ()
-.IR pthread_once ()
-.IR pthread_rwlock_destroy ()
-.IR pthread_rwlock_init ()
-.IR pthread_rwlock_rdlock ()
-.IR pthread_rwlock_tryrdlock ()
-.IR pthread_rwlock_trywrlock ()
-.IR pthread_rwlock_unlock ()
-.IR pthread_rwlock_wrlock ()
-.IR pthread_rwlockattr_destroy ()
-.IR pthread_rwlockattr_init ()
-.IR pthread_self ()
-.IR pthread_setcancelstate ()
-.IR pthread_setcanceltype ()
-.IR pthread_setspecific ()
-.IR pthread_testcancel ()
-.in
-.fi
-.SS TMO - _POSIX_TIMEOUTS - _SC_TIMEOUTS
-The following functions are present:
-.P
-.nf
-.in +4n
-.IR mq_timedreceive ()
-.IR mq_timedsend ()
-.IR pthread_mutex_timedlock ()
-.IR pthread_rwlock_timedrdlock ()
-.IR pthread_rwlock_timedwrlock ()
-.IR sem_timedwait ()
-.IR posix_trace_timedgetnext_event ()
-.in
-.fi
-.SS TMR - _POSIX_TIMERS - _SC_TIMERS
-The following functions are present:
-.P
-.nf
-.in +4n
-.IR clock_getres ()
-.IR clock_gettime ()
-.IR clock_settime ()
-.IR nanosleep ()
-.IR timer_create ()
-.IR timer_delete ()
-.IR timer_gettime ()
-.IR timer_getoverrun ()
-.IR timer_settime ()
-.in
-.fi
-.SS TRC - _POSIX_TRACE - _SC_TRACE
-POSIX tracing is available.
-The following functions are present:
-.P
-.nf
-.in +4n
-.IR posix_trace_attr_destroy ()
-.IR posix_trace_attr_getclockres ()
-.IR posix_trace_attr_getcreatetime ()
-.IR posix_trace_attr_getgenversion ()
-.IR posix_trace_attr_getmaxdatasize ()
-.IR posix_trace_attr_getmaxsystemeventsize ()
-.IR posix_trace_attr_getmaxusereventsize ()
-.IR posix_trace_attr_getname ()
-.IR posix_trace_attr_getstreamfullpolicy ()
-.IR posix_trace_attr_getstreamsize ()
-.IR posix_trace_attr_init ()
-.IR posix_trace_attr_setmaxdatasize ()
-.IR posix_trace_attr_setname ()
-.IR posix_trace_attr_setstreamsize ()
-.IR posix_trace_attr_setstreamfullpolicy ()
-.IR posix_trace_clear ()
-.IR posix_trace_create ()
-.IR posix_trace_event ()
-.IR posix_trace_eventid_equal ()
-.IR posix_trace_eventid_get_name ()
-.IR posix_trace_eventid_open ()
-.IR posix_trace_eventtypelist_getnext_id ()
-.IR posix_trace_eventtypelist_rewind ()
-.IR posix_trace_flush ()
-.IR posix_trace_get_attr ()
-.IR posix_trace_get_status ()
-.IR posix_trace_getnext_event ()
-.IR posix_trace_shutdown ()
-.IR posix_trace_start ()
-.IR posix_trace_stop ()
-.IR posix_trace_trygetnext_event ()
-.in
-.fi
-.SS TEF - _POSIX_TRACE_EVENT_FILTER - _SC_TRACE_EVENT_FILTER
-This option implies the
-.B _POSIX_TRACE
-option.
-The following functions are present:
-.P
-.nf
-.in +4n
-.IR posix_trace_eventset_add ()
-.IR posix_trace_eventset_del ()
-.IR posix_trace_eventset_empty ()
-.IR posix_trace_eventset_fill ()
-.IR posix_trace_eventset_ismember ()
-.IR posix_trace_get_filter ()
-.IR posix_trace_set_filter ()
-.IR posix_trace_trid_eventid_open ()
-.in
-.fi
-.SS TRI - _POSIX_TRACE_INHERIT - _SC_TRACE_INHERIT
-Tracing children of the traced process is supported.
-This option implies the
-.B _POSIX_TRACE
-option.
-The following functions are present:
-.P
-.nf
-.in +4n
-.IR posix_trace_attr_getinherited ()
-.IR posix_trace_attr_setinherited ()
-.in
-.fi
-.SS TRL - _POSIX_TRACE_LOG - _SC_TRACE_LOG
-This option implies the
-.B _POSIX_TRACE
-option.
-The following functions are present:
-.P
-.nf
-.in +4n
-.IR posix_trace_attr_getlogfullpolicy ()
-.IR posix_trace_attr_getlogsize ()
-.IR posix_trace_attr_setlogfullpolicy ()
-.IR posix_trace_attr_setlogsize ()
-.IR posix_trace_close ()
-.IR posix_trace_create_withlog ()
-.IR posix_trace_open ()
-.IR posix_trace_rewind ()
-.in
-.fi
-.SS TYM - _POSIX_TYPED_MEMORY_OBJECTS - _SC_TYPED_MEMORY_OBJECT
-The following functions are present:
-.P
-.nf
-.in +4n
-.IR posix_mem_offset ()
-.IR posix_typed_mem_get_info ()
-.IR posix_typed_mem_open ()
-.in
-.fi
-.SS --- - _POSIX_VDISABLE
-Always present (probably 0).
-Value to set a changeable special control
-character to indicate that it is disabled.
-.SH X/OPEN SYSTEM INTERFACE EXTENSIONS
-.SS XSI - _XOPEN_CRYPT - _SC_XOPEN_CRYPT
-The following functions are present:
-.P
-.nf
-.in +4n
-.IR crypt ()
-.IR encrypt ()
-.IR setkey ()
-.fi
-.SS XSI - _XOPEN_REALTIME - _SC_XOPEN_REALTIME
-This option implies the following options:
-.P
-.PD 0
-.TP
-.BR _POSIX_ASYNCHRONOUS_IO == 200112L
-.TP
-.B _POSIX_FSYNC
-.TP
-.B _POSIX_MAPPED_FILES
-.TP
-.BR _POSIX_MEMLOCK == 200112L
-.TP
-.BR _POSIX_MEMLOCK_RANGE == 200112L
-.TP
-.B _POSIX_MEMORY_PROTECTION
-.TP
-.BR _POSIX_MESSAGE_PASSING == 200112L
-.TP
-.B _POSIX_PRIORITIZED_IO
-.TP
-.BR _POSIX_PRIORITY_SCHEDULING == 200112L
-.TP
-.BR _POSIX_REALTIME_SIGNALS == 200112L
-.TP
-.BR _POSIX_SEMAPHORES == 200112L
-.TP
-.BR _POSIX_SHARED_MEMORY_OBJECTS == 200112L
-.TP
-.BR _POSIX_SYNCHRONIZED_IO == 200112L
-.TP
-.BR _POSIX_TIMERS == 200112L
-.PD
-.\"
-.SS ADV - --- - ---
-The Advanced Realtime option group implies that the following options
-are all defined to 200112L:
-.P
-.PD 0
-.TP
-.B _POSIX_ADVISORY_INFO
-.TP
-.B _POSIX_CLOCK_SELECTION
-(implies
-.BR _POSIX_TIMERS )
-.TP
-.B _POSIX_CPUTIME
-(implies
-.BR _POSIX_TIMERS )
-.TP
-.B _POSIX_MONOTONIC_CLOCK
-(implies
-.BR _POSIX_TIMERS )
-.TP
-.B _POSIX_SPAWN
-.TP
-.B _POSIX_SPORADIC_SERVER
-(implies
-.BR _POSIX_PRIORITY_SCHEDULING )
-.TP
-.B _POSIX_TIMEOUTS
-.TP
-.B _POSIX_TYPED_MEMORY_OBJECTS
-.PD
-.\"
-.SS XSI - _XOPEN_REALTIME_THREADS - _SC_XOPEN_REALTIME_THREADS
-This option implies that the following options
-are all defined to 200112L:
-.P
-.PD 0
-.TP
-.B _POSIX_THREAD_PRIO_INHERIT
-.TP
-.B _POSIX_THREAD_PRIO_PROTECT
-.TP
-.B _POSIX_THREAD_PRIORITY_SCHEDULING
-.PD
-.SS ADVANCED REALTIME THREADS - --- - ---
-This option implies that the following options
-are all defined to 200112L:
-.P
-.PD 0
-.TP
-.B _POSIX_BARRIERS
-(implies
-.BR _POSIX_THREADS ,
-.BR _POSIX_THREAD_SAFE_FUNCTIONS )
-.TP
-.B _POSIX_SPIN_LOCKS
-(implies
-.BR _POSIX_THREADS ,
-.BR _POSIX_THREAD_SAFE_FUNCTIONS )
-.TP
-.B _POSIX_THREAD_CPUTIME
-(implies
-.BR _POSIX_TIMERS )
-.TP
-.B _POSIX_THREAD_SPORADIC_SERVER
-(implies
-.BR _POSIX_THREAD_PRIORITY_SCHEDULING )
-.PD
-.\"
-.SS TRACING - --- - ---
-This option implies that the following options
-are all defined to 200112L:
-.P
-.PD 0
-.TP
-.B _POSIX_TRACE
-.TP
-.B _POSIX_TRACE_EVENT_FILTER
-.TP
-.B _POSIX_TRACE_LOG
-.TP
-.B _POSIX_TRACE_INHERIT
-.PD
-.SS STREAMS - _XOPEN_STREAMS - _SC_XOPEN_STREAMS
-The following functions are present:
-.P
-.nf
-.in +4n
-.IR fattach ()
-.IR fdetach ()
-.IR getmsg ()
-.IR getpmsg ()
-.IR ioctl ()
-.IR isastream ()
-.IR putmsg ()
-.IR putpmsg ()
-.in
-.fi
-.SS XSI - _XOPEN_LEGACY - _SC_XOPEN_LEGACY
-Functions included in the legacy option group were previously mandatory,
-but are now optional in this version.
-The following functions are present:
-.P
-.nf
-.in +4n
-.IR bcmp ()
-.IR bcopy ()
-.IR bzero ()
-.IR ecvt ()
-.IR fcvt ()
-.IR ftime ()
-.IR gcvt ()
-.IR getwd ()
-.IR index ()
-.IR mktemp ()
-.IR rindex ()
-.IR utimes ()
-.IR wcswcs ()
-.in
-.fi
-.SS XSI - _XOPEN_UNIX - _SC_XOPEN_UNIX
-The following functions are present:
-.P
-.nf
-.in +4n
-.IR mmap ()
-.IR munmap ()
-.IR msync ()
-.in
-.fi
-.P
-This option implies the following options:
-.P
-.PD 0
-.TP
-.B _POSIX_FSYNC
-.TP
-.B _POSIX_MAPPED_FILES
-.TP
-.B _POSIX_MEMORY_PROTECTION
-.TP
-.B _POSIX_THREAD_ATTR_STACKADDR
-.TP
-.B _POSIX_THREAD_ATTR_STACKSIZE
-.TP
-.B _POSIX_THREAD_PROCESS_SHARED
-.TP
-.B _POSIX_THREAD_SAFE_FUNCTIONS
-.TP
-.B _POSIX_THREADS
-.PD
-.P
-This option may imply the following options from the XSI option groups:
-.P
-.PD 0
-.TP
-.RB "Encryption (" _XOPEN_CRYPT )
-.TP
-.RB "Realtime (" _XOPEN_REALTIME )
-.TP
-.RB "Advanced Realtime (" ADB )
-.TP
-.RB "Realtime Threads (" _XOPEN_REALTIME_THREADS )
-.TP
-.RB "Advanced Realtime Threads (" "ADVANCED REALTIME THREADS" )
-.TP
-.RB "Tracing (" TRACING )
-.TP
-.RB "XSI Streams (" STREAMS )
-.TP
-.RB "Legacy (" _XOPEN_LEGACY )
-.PD
-.SH SEE ALSO
-.BR sysconf (3),
-.BR standards (7)