Manpages - posixoptions.7

The following advisory functions are present:

  posix_fadvise()
  posix_fallocate()
  posix_memalign()
  posix_madvise()

The header <aio.h> is present. The following functions are present:

  aio_cancel()
  aio_error()
  aio_fsync()
  aio_read()
  aio_return()
  aio_suspend()
  aio_write()
  lio_listio()

This option implies the _POSIX_THREADS and _POSIX_THREAD_SAFE_FUNCTIONS options. The following functions are present:

  pthread_barrier_destroy()
  pthread_barrier_init()
  pthread_barrier_wait()
  pthread_barrierattr_destroy()
  pthread_barrierattr_init()

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

  chown()
  fchown()

This option implies the _POSIX_TIMERS option. The following functions are present:

  pthread_condattr_getclock()
  pthread_condattr_setclock()
  clock_nanosleep()

If CLOCK_REALTIME is changed by the function /clock_settime/(), then this affects all timers set for an absolute time.

The CLOCK_PROCESS_CPUTIME_ID clock ID is supported. The initial value of this clock is 0 for each process. This option implies the _POSIX_TIMERS option. The function /clock_getcpuclockid/() is present.

This option has been deleted. Not in final XPG6.

The function /fsync/() is present.

Internet Protocol Version 6 is supported.

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:

  setpgid()
  tcdrain()
  tcflush()
  tcgetpgrp()
  tcsendbreak()
  tcsetattr()
  tcsetpgrp()

Shared memory is supported. The include file <sys/mman.h> is present. The following functions are present:

  mmap()
  msync()
  munmap()

Shared memory can be locked into core. The following functions are present:

  mlockall()
  munlockall()

More precisely, ranges can be locked into core. The following functions are present:

  mlock()
  munlock()

The function /mprotect/() is present.

The include file <mqueue.h> is present. The following functions are present:

  mq_close()
  mq_getattr()
  mq_notify()
  mq_open()
  mq_receive()
  mq_send()
  mq_setattr()
  mq_unlink()

CLOCK_MONOTONIC is supported. This option implies the _POSIX_TIMERS option. The following functions are affected:

  aio_suspend()
  clock_getres()
  clock_gettime()
  clock_settime()
  timer_create()

This option has been deleted. Not in final XPG6.

If this option is in effect (as it always is under POSIX.1-2001), then pathname components longer than NAME_MAX are not truncated, but give an error. This property may be dependent on the path prefix of the component.

This option says that one can specify priorities for asynchronous I/O. This affects the functions

  aio_read()
  aio_write()

The include file <sched.h> is present. The following functions are present:

  sched_get_priority_max()
  sched_get_priority_min()
  sched_getparam()
  sched_getscheduler()
  sched_rr_get_interval()
  sched_setparam()
  sched_setscheduler()
  sched_yield()

If also _POSIX_SPAWN is in effect, then the following functions are present:

  posix_spawnattr_getschedparam()
  posix_spawnattr_getschedpolicy()
  posix_spawnattr_setschedparam()
  posix_spawnattr_setschedpolicy()

Raw sockets are supported. The following functions are affected:

  getsockopt()
  setsockopt()

This option implies the _POSIX_THREADS option. Conversely, under POSIX.1-2001 the _POSIX_THREADS option implies this option.

The following functions are present:

  pthread_rwlock_destroy()
  pthread_rwlock_init()
  pthread_rwlock_rdlock()
  pthread_rwlock_tryrdlock()
  pthread_rwlock_trywrlock()
  pthread_rwlock_unlock()
  pthread_rwlock_wrlock()
  pthread_rwlockattr_destroy()
  pthread_rwlockattr_init()

Realtime signals are supported. The following functions are present:

  sigqueue()
  sigtimedwait()
  sigwaitinfo()

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:

  regcomp()
  regerror()
  regexec()
  regfree()

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:

  exec()
  kill()
  seteuid()
  setegid()
  setgid()
  setuid()

The include file <semaphore.h> is present. The following functions are present:

  sem_close()
  sem_destroy()
  sem_getvalue()
  sem_init()
  sem_open()
  sem_post()
  sem_trywait()
  sem_unlink()
  sem_wait()

The following functions are present:

  mmap()
  munmap()
  shm_open()
  shm_unlink()

If this option is in effect (as it always is under POSIX.1-2001), the function /system/() is present.

This option describes support for process creation in a context where it is difficult or impossible to use /fork/(), for example, because no MMU is present.

If _POSIX_SPAWN is in effect, then the include file <spawn.h> and the following functions are present:

  posix_spawn()
  posix_spawn_file_actions_addclose()
  posix_spawn_file_actions_adddup2()
  posix_spawn_file_actions_addopen()
  posix_spawn_file_actions_destroy()
  posix_spawn_file_actions_init()
  posix_spawnattr_destroy()
  posix_spawnattr_getsigdefault()
  posix_spawnattr_getflags()
  posix_spawnattr_getpgroup()
  posix_spawnattr_getsigmask()
  posix_spawnattr_init()
  posix_spawnattr_setsigdefault()
  posix_spawnattr_setflags()
  posix_spawnattr_setpgroup()
  posix_spawnattr_setsigmask()
  posix_spawnp()

If also _POSIX_PRIORITY_SCHEDULING is in effect, then the following functions are present:

  posix_spawnattr_getschedparam()
  posix_spawnattr_getschedpolicy()
  posix_spawnattr_setschedparam()
  posix_spawnattr_setschedpolicy()

This option implies the _POSIX_THREADS and _POSIX_THREAD_SAFE_FUNCTIONS options. The following functions are present:

  pthread_spin_destroy()
  pthread_spin_init()
  pthread_spin_lock()
  pthread_spin_trylock()
  pthread_spin_unlock()

The scheduling policy SCHED_SPORADIC is supported. This option implies the _POSIX_PRIORITY_SCHEDULING option. The following functions are affected:

  sched_setparam()
  sched_setscheduler()

The following functions are affected:

  open()
  msync()
  fsync()
  fdatasync()

The following functions are affected:

  pthread_attr_getstack()
  pthread_attr_getstackaddr()
  pthread_attr_setstack()
  pthread_attr_setstackaddr()

The following functions are affected:

  pthread_attr_getstack()
  pthread_attr_getstacksize()
  pthread_attr_setstack()
  pthread_attr_setstacksize()

The clockID CLOCK_THREAD_CPUTIME_ID is supported. This option implies the _POSIX_TIMERS option. The following functions are affected:

  pthread_getcpuclockid()
  clock_getres()
  clock_gettime()
  clock_settime()
  timer_create()

The following functions are affected:

  pthread_mutexattr_getprotocol()
  pthread_mutexattr_setprotocol()

The following functions are affected:

  pthread_mutex_getprioceiling()
  pthread_mutex_setprioceiling()
  pthread_mutexattr_getprioceiling()
  pthread_mutexattr_getprotocol()
  pthread_mutexattr_setprioceiling()
  pthread_mutexattr_setprotocol()

_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:

  pthread_attr_getinheritsched()
  pthread_attr_getschedpolicy()
  pthread_attr_getscope()
  pthread_attr_setinheritsched()
  pthread_attr_setschedpolicy()
  pthread_attr_setscope()
  pthread_getschedparam()
  pthread_setschedparam()
  pthread_setschedprio()

The following functions are affected:

  pthread_barrierattr_getpshared()
  pthread_barrierattr_setpshared()
  pthread_condattr_getpshared()
  pthread_condattr_setpshared()
  pthread_mutexattr_getpshared()
  pthread_mutexattr_setpshared()
  pthread_rwlockattr_getpshared()
  pthread_rwlockattr_setpshared()

The following functions are affected:

  readdir_r()
  getgrgid_r()
  getgrnam_r()
  getpwnam_r()
  getpwuid_r()
  flockfile()
  ftrylockfile()
  funlockfile()
  getc_unlocked()
  getchar_unlocked()
  putc_unlocked()
  putchar_unlocked()
  rand_r()
  strerror_r()
  strtok_r()
  asctime_r()
  ctime_r()
  gmtime_r()
  localtime_r()

This option implies the _POSIX_THREAD_PRIORITY_SCHEDULING option. The following functions are affected:

  sched_getparam()
  sched_setparam()
  sched_setscheduler()

Basic support for POSIX threads is available. The following functions are present:

  pthread_atfork()
  pthread_attr_destroy()
  pthread_attr_getdetachstate()
  pthread_attr_getschedparam()
  pthread_attr_init()
  pthread_attr_setdetachstate()
  pthread_attr_setschedparam()
  pthread_cancel()
  pthread_cleanup_push()
  pthread_cleanup_pop()
  pthread_cond_broadcast()
  pthread_cond_destroy()
  pthread_cond_init()
  pthread_cond_signal()
  pthread_cond_timedwait()
  pthread_cond_wait()
  pthread_condattr_destroy()
  pthread_condattr_init()
  pthread_create()
  pthread_detach()
  pthread_equal()
  pthread_exit()
  pthread_getspecific()
  pthread_join()
  pthread_key_create()
  pthread_key_delete()
  pthread_mutex_destroy()
  pthread_mutex_init()
  pthread_mutex_lock()
  pthread_mutex_trylock()
  pthread_mutex_unlock()
  pthread_mutexattr_destroy()
  pthread_mutexattr_init()
  pthread_once()
  pthread_rwlock_destroy()
  pthread_rwlock_init()
  pthread_rwlock_rdlock()
  pthread_rwlock_tryrdlock()
  pthread_rwlock_trywrlock()
  pthread_rwlock_unlock()
  pthread_rwlock_wrlock()
  pthread_rwlockattr_destroy()
  pthread_rwlockattr_init()
  pthread_self()
  pthread_setcancelstate()
  pthread_setcanceltype()
  pthread_setspecific()
  pthread_testcancel()

The following functions are present:

  mq_timedreceive()
  mq_timedsend()
  pthread_mutex_timedlock()
  pthread_rwlock_timedrdlock()
  pthread_rwlock_timedwrlock()
  sem_timedwait()
  posix_trace_timedgetnext_event()

The following functions are present:

  clock_getres()
  clock_gettime()
  clock_settime()
  nanosleep()
  timer_create()
  timer_delete()
  timer_gettime()
  timer_getoverrun()
  timer_settime()

POSIX tracing is available. The following functions are present:

  posix_trace_attr_destroy()
  posix_trace_attr_getclockres()
  posix_trace_attr_getcreatetime()
  posix_trace_attr_getgenversion()
  posix_trace_attr_getmaxdatasize()
  posix_trace_attr_getmaxsystemeventsize()
  posix_trace_attr_getmaxusereventsize()
  posix_trace_attr_getname()
  posix_trace_attr_getstreamfullpolicy()
  posix_trace_attr_getstreamsize()
  posix_trace_attr_init()
  posix_trace_attr_setmaxdatasize()
  posix_trace_attr_setname()
  posix_trace_attr_setstreamsize()
  posix_trace_attr_setstreamfullpolicy()
  posix_trace_clear()
  posix_trace_create()
  posix_trace_event()
  posix_trace_eventid_equal()
  posix_trace_eventid_get_name()
  posix_trace_eventid_open()
  posix_trace_eventtypelist_getnext_id()
  posix_trace_eventtypelist_rewind()
  posix_trace_flush()
  posix_trace_get_attr()
  posix_trace_get_status()
  posix_trace_getnext_event()
  posix_trace_shutdown()
  posix_trace_start()
  posix_trace_stop()
  posix_trace_trygetnext_event()

This option implies the _POSIX_TRACE option. The following functions are present:

  posix_trace_eventset_add()
  posix_trace_eventset_del()
  posix_trace_eventset_empty()
  posix_trace_eventset_fill()
  posix_trace_eventset_ismember()
  posix_trace_get_filter()
  posix_trace_set_filter()
  posix_trace_trid_eventid_open()

Tracing children of the traced process is supported. This option implies the _POSIX_TRACE option. The following functions are present:

  posix_trace_attr_getinherited()
  posix_trace_attr_setinherited()

This option implies the _POSIX_TRACE option. The following functions are present:

  posix_trace_attr_getlogfullpolicy()
  posix_trace_attr_getlogsize()
  posix_trace_attr_setlogfullpolicy()
  posix_trace_attr_setlogsize()
  posix_trace_close()
  posix_trace_create_withlog()
  posix_trace_open()
  posix_trace_rewind()

The following functions are present:

  posix_mem_offset()
  posix_typed_mem_get_info()
  posix_typed_mem_open()

Always present (probably 0). Value to set a changeable special control character to indicate that it is disabled.

The following functions are present:

  crypt()
  encrypt()
  setkey()

This option implies the following options:

_POSIX_ASYNCHRONOUS_IO*==*200112L

_POSIX_FSYNC

_POSIX_MAPPED_FILES

_POSIX_MEMLOCK*==*200112L

_POSIX_MEMLOCK_RANGE*==*200112L

_POSIX_MEMORY_PROTECTION

_POSIX_MESSAGE_PASSING*==*200112L

_POSIX_PRIORITIZED_IO

_POSIX_PRIORITY_SCHEDULING*==*200112L

_POSIX_REALTIME_SIGNALS*==*200112L

_POSIX_SEMAPHORES*==*200112L

_POSIX_SHARED_MEMORY_OBJECTS*==*200112L

_POSIX_SYNCHRONIZED_IO*==*200112L

_POSIX_TIMERS*==*200112L

The Advanced Realtime option group implies that the following options are all defined to 200112L:

_POSIX_ADVISORY_INFO

_POSIX_CLOCK_SELECTION

(implies _POSIX_TIMERS)

_POSIX_CPUTIME

(implies _POSIX_TIMERS)

_POSIX_MONOTONIC_CLOCK

(implies _POSIX_TIMERS)

_POSIX_SPAWN

_POSIX_SPORADIC_SERVER

(implies _POSIX_PRIORITY_SCHEDULING)

_POSIX_TIMEOUTS

_POSIX_TYPED_MEMORY_OBJECTS

This option implies that the following options are all defined to 200112L:

_POSIX_THREAD_PRIO_INHERIT

_POSIX_THREAD_PRIO_PROTECT

_POSIX_THREAD_PRIORITY_SCHEDULING

This option implies that the following options are all defined to 200112L:

_POSIX_BARRIERS

(implies _POSIX_THREADS, _POSIX_THREAD_SAFE_FUNCTIONS)

_POSIX_SPIN_LOCKS

(implies _POSIX_THREADS, _POSIX_THREAD_SAFE_FUNCTIONS)

_POSIX_THREAD_CPUTIME

(implies _POSIX_TIMERS)

_POSIX_THREAD_SPORADIC_SERVER

(implies _POSIX_THREAD_PRIORITY_SCHEDULING)

This option implies that the following options are all defined to 200112L:

_POSIX_TRACE

_POSIX_TRACE_EVENT_FILTER

_POSIX_TRACE_LOG

_POSIX_TRACE_INHERIT

The following functions are present:

  fattach()
  fdetach()
  getmsg()
  getpmsg()
  ioctl()
  isastream()
  putmsg()
  putpmsg()

Functions included in the legacy option group were previously mandatory, but are now optional in this version. The following functions are present:

  bcmp()
  bcopy()
  bzero()
  ecvt()
  fcvt()
  ftime()
  gcvt()
  getwd()
  index()
  mktemp()
  rindex()
  utimes()
  wcswcs()

The following functions are present:

  mmap()
  munmap()
  msync()

This option implies the following options:

_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

This option may imply the following options from the XSI option groups:

Encryption (_XOPEN_CRYPT)

Realtime (_XOPEN_REALTIME)

Advanced Realtime (ADB)

Realtime Threads (_XOPEN_REALTIME_THREADS)

Advanced Realtime Threads (ADVANCED REALTIME THREADS)

Tracing (TRACING)

XSI Streams (STREAMS)

Legacy (_XOPEN_LEGACY)