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    Command:

    posixoptions

    
    
    

    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
           sysconf(3),  fpathconf(3),  pathconf(3),  confstr(3)  to do this at run
           time.  From shell scripts one can use getconf(1).  For more detail, see
           sysconf(3).
    
           We give the name of the POSIX abbreviation, the option, the name of the
           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.
    
       ADV - _POSIX_ADVISORY_INFO - _SC_ADVISORY_INFO
           The following advisory functions are present:
    
               posix_fadvise(),
               posix_fallocate(),
               posix_memalign(),
               posix_madvise().
    
       AIO - _POSIX_ASYNCHRONOUS_IO - _SC_ASYNCHRONOUS_IO
           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().
    
       BAR - _POSIX_BARRIERS - _SC_BARRIERS
           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().
    
       --- - 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
           functions chown(), fchown().
    
       CS - _POSIX_CLOCK_SELECTION - _SC_CLOCK_SELECTION
    
       --- - _POSIX_FILE_LOCKING - _SC_FILE_LOCKING
           This option has been deleted.  Not in final XPG6.
    
       FSC - _POSIX_FSYNC - _SC_FSYNC
           The function fsync() is present.
    
       IP6 - _POSIX_IPV6 - _SC_IPV6
           Internet Protocol Version 6 is supported.
    
       --- - _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  func-
           tions are present:
    
               setpgid(),
               tcdrain(),
               tcflush(),
               tcgetpgrp(),
               tcsendbreak(),
               tcsetattr(),
               tcsetpgrp().
    
       MF - _POSIX_MAPPED_FILES - _SC_MAPPED_FILES
           Shared  memory is supported.  The include file <sys/mman.h> is present.
           The following functions are present: mmap(), msync(), munmap().
    
       ML - _POSIX_MEMLOCK - _SC_MEMLOCK
           Shared memory can be  locked  into  core.   The  functions  mlockall(),
           munlockall() are present.
    
       MR/MLR - _POSIX_MEMLOCK_RANGE - _SC_MEMLOCK_RANGE
           More precisely, ranges can be locked into core.  The functions mlock(),
           munlock() are present.
    
       MPR - _POSIX_MEMORY_PROTECTION - _SC_MEMORY_PROTECTION
           The function mprotect() is present.
    
       MSG - _POSIX_MESSAGE_PASSING - _SC_MESSAGE_PASSING
           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().
    
       MON - _POSIX_MONOTONIC_CLOCK - _SC_MONOTONIC_CLOCK
           pathname components longer than NAME_MAX are not truncated, but give an
           error.  This property may be dependent on the path prefix of the compo-
           nent.
    
       PIO - _POSIX_PRIORITIZED_IO - _SC_PRIORITIZED_IO
           This  option says that one can specify priorities for asynchronous I/O.
           This affects the functions
    
               aio_read(),
               aio_write().
    
       PS - _POSIX_PRIORITY_SCHEDULING - _SC_PRIORITY_SCHEDULING
           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().
    
       RS - _POSIX_RAW_SOCKETS
           Raw sockets are supported.  Affected functions are  getsockopt(),  set-
           sockopt().
    
       --- - _POSIX_READER_WRITER_LOCKS - _SC_READER_WRITER_LOCKS
           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().
    
       RTS - _POSIX_REALTIME_SIGNALS - _SC_REALTIME_SIGNALS
               regfree().
    
       --- - _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.  Affected
           functions are
    
               exec(),
               kill(),
               seteuid(),
               setegid(),
               setgid(),
               setuid().
    
       SEM - _POSIX_SEMAPHORES - _SC_SEMAPHORES
           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().
    
       SHM - _POSIX_SHARED_MEMORY_OBJECTS - _SC_SHARED_MEMORY_OBJECTS
           The following functions are present:
    
               mmap(),
               munmap(),
               shm_open(),
               shm_unlink().
    
       --- - _POSIX_SHELL - _SC_SHELL
           If  this  option is in effect (as it always is under POSIX.1-2001), the
           function system() is present.
    
       SPN - _POSIX_SPAWN - _SC_SPAWN
           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_getschedparam(),
               posix_spawnattr_getschedpolicy(),
               posix_spawnattr_setschedparam(),
               posix_spawnattr_setschedpolicy().
    
       SPI - _POSIX_SPIN_LOCKS - _SC_SPIN_LOCKS
           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().
    
       SS - _POSIX_SPORADIC_SERVER - _SC_SPORADIC_SERVER
           The scheduling policy SCHED_SPORADIC is supported.  This option implies
           the _POSIX_PRIORITY_SCHEDULING option.  Affected functions are
    
               sched_setparam(),
               sched_setscheduler().
    
       SIO - _POSIX_SYNCHRONIZED_IO - _SC_SYNCHRONIZED_IO
           Affected functions are open(), msync(), fsync(), fdatasync().
    
       TSA - _POSIX_THREAD_ATTR_STACKADDR - _SC_THREAD_ATTR_STACKADDR
           Affected functions are
    
               pthread_attr_getstack(),
               pthread_attr_getstackaddr(),
               pthread_attr_setstack(),
               pthread_attr_setstackaddr().
    
       TSS - _POSIX_THREAD_ATTR_STACKSIZE - _SC_THREAD_ATTR_STACKSIZE
           Affected functions are
    
               pthread_attr_getstack(),
               pthread_attr_getstacksize(),
               pthread_attr_setstack(),
               pthread_attr_setstacksize().
    
       TCT - _POSIX_THREAD_CPUTIME - _SC_THREAD_CPUTIME
           The clockID CLOCK_THREAD_CPUTIME_ID is supported.  This option  implies
           the _POSIX_TIMERS option.  Affected functions are
    
               pthread_getcpuclockid(),
               clock_getres(),
               clock_gettime(),
               clock_settime(),
               timer_create().
    
       TPI - _POSIX_THREAD_PRIO_INHERIT - _SC_THREAD_PRIO_INHERIT
    
       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.   Affected
           functions are
    
               pthread_attr_getinheritsched(),
               pthread_attr_getschedpolicy(),
               pthread_attr_getscope(),
               pthread_attr_setinheritsched(),
               pthread_attr_setschedpolicy(),
               pthread_attr_setscope(),
               pthread_getschedparam(),
               pthread_setschedparam(),
               pthread_setschedprio().
    
       TSH - _POSIX_THREAD_PROCESS_SHARED - _SC_THREAD_PROCESS_SHARED
           Affected functions are
    
               pthread_barrierattr_getpshared(),
               pthread_barrierattr_setpshared(),
               pthread_condattr_getpshared(),
               pthread_condattr_setpshared(),
               pthread_mutexattr_getpshared(),
               pthread_mutexattr_setpshared(),
               pthread_rwlockattr_getpshared(),
               pthread_rwlockattr_setpshared().
    
       TSF - _POSIX_THREAD_SAFE_FUNCTIONS - _SC_THREAD_SAFE_FUNCTIONS
           Affected functions are
    
               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().
    
       TSP - _POSIX_THREAD_SPORADIC_SERVER - _SC_THREAD_SPORADIC_SERVER
               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().
    
       TMO - _POSIX_TIMEOUTS - _SC_TIMEOUTS
           The following functions are present:
    
               mq_timedreceive(),
               mq_timedsend(),
               pthread_mutex_timedlock(),
               timer_gettime(),
               timer_getoverrun(),
               timer_settime().
    
       TRC - _POSIX_TRACE - _SC_TRACE
           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().
    
       TEF - _POSIX_TRACE_EVENT_FILTER - _SC_TRACE_EVENT_FILTER
           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().
    
               posix_trace_attr_setlogsize(),
               posix_trace_close(),
               posix_trace_create_withlog(),
               posix_trace_open(),
               posix_trace_rewind().
    
       TYM - _POSIX_TYPED_MEMORY_OBJECTS - _SC_TYPED_MEMORY_OBJECT
           The following functions are present:
    
               posix_mem_offset(),
               posix_typed_mem_get_info(),
               posix_typed_mem_open().
    
       --- - _POSIX_VDISABLE
           Always present (probably 0).  Value to set a changeable special control
           character to indicate that it is disabled.
    
    
    

    XOPEN EXTENSIONS

           _XOPEN_CRYPT,  _XOPEN_LEGACY, _XOPEN_REALTIME, _XOPEN_REALTIME_THREADS,
           _XOPEN_UNIX.
    
    
    

    SEE ALSO

           sysconf(3), standards(7)
    
                                      2007-12-21                   POSIXOPTIONS(7)
    
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