Adding upstream version 6.05.01.upstream/6.05.01

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1014 insertions, 0 deletions

diff --git a/man7/posixoptions.7 b/man7/posixoptions.7
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+.\" Copyright (c) 2003 Andries Brouwer (aeb@cwi.nl)
+.\"
+.\" SPDX-License-Identifier: GPL-2.0-or-later
+.\"
+.TH posixoptions 7 2022-10-30 "Linux man-pages 6.05.01"
+.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).
+.PP
+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:
+.PP
+.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:
+.PP
+.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:
+.PP
+.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
+.PP
+.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:
+.PP
+.nf
+.in +4n
+.IR pthread_condattr_getclock ()
+.IR pthread_condattr_setclock ()
+.IR clock_nanosleep ()
+.in
+.fi
+.PP
+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:
+.PP
+.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:
+.PP
+.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:
+.PP
+.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:
+.PP
+.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:
+.PP
+.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:
+.PP
+.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
+.PP
+.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:
+.PP
+.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
+.PP
+If also
+.B _POSIX_SPAWN
+is in effect, then the following functions are present:
+.PP
+.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:
+.PP
+.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.
+.PP
+The following functions are present:
+.PP
+.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:
+.PP
+.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:
+.PP
+.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:
+.PP
+.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:
+.PP
+.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:
+.PP
+.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.
+.PP
+If
+.B _POSIX_SPAWN
+is in effect, then the include file
+.I <spawn.h>
+and the following functions are present:
+.PP
+.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
+.PP
+If also
+.B _POSIX_PRIORITY_SCHEDULING
+is in effect, then
+the following functions are present:
+.PP
+.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:
+.PP
+.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:
+.PP
+.nf
+.in +4n
+.IR sched_setparam ()
+.IR sched_setscheduler ()
+.in
+.fi
+.SS SIO - _POSIX_SYNCHRONIZED_IO - _SC_SYNCHRONIZED_IO
+The following functions are affected:
+.PP
+.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:
+.PP
+.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:
+.PP
+.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:
+.PP
+.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:
+.PP
+.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:
+.PP
+.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:
+.PP
+.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:
+.PP
+.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:
+.PP
+.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:
+.PP
+.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:
+.PP
+.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:
+.PP
+.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:
+.PP
+.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:
+.PP
+.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:
+.PP
+.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:
+.PP
+.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:
+.PP
+.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:
+.PP
+.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:
+.PP
+.nf
+.in +4n
+.IR crypt ()
+.IR encrypt ()
+.IR setkey ()
+.fi
+.SS XSI - _XOPEN_REALTIME - _SC_XOPEN_REALTIME
+This option implies the following options:
+.PP
+.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:
+.PP
+.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:
+.PP
+.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:
+.PP
+.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:
+.PP
+.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:
+.PP
+.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:
+.PP
+.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:
+.PP
+.nf
+.in +4n
+.IR mmap ()
+.IR munmap ()
+.IR msync ()
+.in
+.fi
+.PP
+This option implies the following options:
+.PP
+.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
+.PP
+This option may imply the following options from the XSI option groups:
+.PP
+.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)