man7/posixoptions.7

   1 .\" Copyright (c) 2003 Andries Brouwer (aeb@cwi.nl)
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  23 .TH POSIXOPTIONS 7 2003-08-24 "POSIX" "Linux Programmer's Manual"
  24 .SH NAME
  25 posixoptions \- optional parts of the POSIX standard
  26 .SH DESCRIPTION
  27 The POSIX standard (the information below is from POSIX 1003.1-2001)
  28 describes a set of behaviours and interfaces for a compliant system.
  29 However, many interfaces are optional and there are feature test macros
  30 to test the availability of interfaces at compile time, and functions
  31 .BR sysconf (3),
  32 .BR fpathconf (3),
  33 .BR pathconf (3),
  34 .BR confstr (3)
  35 to do this at run time. From shell scripts one can use
  36 .BR getconf (1).
  37 For more detail, see
  38 .BR sysconf (3).
  39 .LP
  40 We give the name of the POSIX abbreviation, the option, the name of the
  41 .B sysconf()
  42 parameter used to inquire about the option, and possibly
  43 a very short description.
  44 Much more precise detail can be found in the POSIX standard itself,
  45 versions of which can nowadays be accessed freely on the web.
  46 .SS "ADV - _POSIX_ADVISORY_INFO - _SC_ADVISORY_INFO"
  47 The advisory functions
  48 .br
  49 .nf
  50 .in +4
  51 .IR posix_fadvise() ,
  52 .IR posix_fallocate() ,
  53 .IR posix_memalign() ,
  54 .IR posix_madvise()
  55 .br
  56 .in -4
  57 .fi
  58 are present.
  59 .SS "AIO - _POSIX_ASYNCHRONOUS_IO - _SC_ASYNCHRONOUS_IO"
  60 The header
  61 .I <aio.h>
  62 is present.
  63 The functions
  64 .br
  65 .nf
  66 .in +4
  67 .IR aio_cancel() ,
  68 .IR aio_error() ,
  69 .IR aio_fsync() ,
  70 .IR aio_read() ,
  71 .IR aio_return() ,
  72 .IR aio_suspend() ,
  73 .IR aio_write() ,
  74 .IR lio_listio()
  75 .br
  76 .in -4
  77 .fi
  78 are present.
  79 .SS "BAR - _POSIX_BARRIERS - _SC_BARRIERS"
  80 This option implies the _POSIX_THREADS and
  81 _POSIX_THREAD_SAFE_FUNCTIONS options.
  82 The functions
  83 .br
  84 .nf
  85 .in +4
  86 .IR pthread_barrier_destroy() ,
  87 .IR pthread_barrier_init() ,
  88 .IR pthread_barrier_wait() ,
  89 .IR pthread_barrierattr_destroy() ,
  90 .IR pthread_barrierattr_init()
  91 .in -4
  92 .br
  93 .fi
  94 are present.
  95 .\" .SS "BE"
  96 .\" Batch environment.
  97 .\" .SS "CD"
  98 .\" C development.
  99 .SS "--- - POSIX_CHOWN_RESTRICTED"
 100 If this option is in effect (as it always is under POSIX 1003.1-2001)
 101 then only root may change the owner of a file, and non-root can only
 102 set the group of a file to one of the groups it belongs to.
 103 This affects the functions
 104 .IR chown() ,
 105 .IR fchown() .
 106 .\" What about lchown() ?
 107 .SS "CS - _POSIX_CLOCK_SELECTION - _SC_CLOCK_SELECTION"
 108 This option implies the _POSIX_TIMERS option.
 109 The functions
 110 .br
 111 .nf
 112 .in +4
 113 .IR pthread_condattr_getclock() ,
 114 .IR pthread_condattr_setclock() ,
 115 .IR clock_nanosleep()
 116 .in -4
 117 .br
 118 .fi
 119 are present.
 120 If CLOCK_REALTIME is changed by the function
 121 .IR clock_settime() ,
 122 then this affects all timers set for an absolute time.
 123 .SS "CPT - _POSIX_CPUTIME - _SC_CPUTIME"
 124 The clockID CLOCK_PROCESS_CPUTIME_ID is supported.
 125 The initial value of this clock is 0 for each process.
 126 This option implies the _POSIX_TIMERS option.
 127 The function
 128 .IR clock_getcpuclockid()
 129 is present.
 130 .\" .SS "FD"
 131 .\" Fortran development
 132 .\" .SS "FR"
 133 .\" Fortran runtime
 134 .SS "--- - _POSIX_FILE_LOCKING - _SC_FILE_LOCKING"
 135 This option has been deleted. Not in final XPG6.
 136 .SS "FSC - _POSIX_FSYNC - _SC_FSYNC "
 137 The function
 138 .I fsync()
 139 is present.
 140 .SS "IP6 - _POSIX_IPV6 - _SC_IPV6"
 141 Internet Protocol Version 6 is supported.
 142 .SS "--- - _POSIX_JOB_CONTROL - _SC_JOB_CONTROL"
 143 If this option is in effect (as it always is under POSIX 1003.1-2001)
 144 then the system implements POSIX \- style job control, and the functions
 145 .br
 146 .nf
 147 .in +4
 148 .IR setpgid() ,
 149 .IR tcdrain() ,
 150 .IR tcflush() ,
 151 .IR tcgetpgrp() ,
 152 .IR tcsendbreak() ,
 153 .IR tcsetattr() ,
 154 .IR tcsetpgrp()
 155 .in -4
 156 are present.
 157 .fi
 158 .SS "MF - _POSIX_MAPPED_FILES - _SC_MAPPED_FILES"
 159 Shared memory is supported. The include file
 160 .I <sys/mman.h>
 161 is present. The functions
 162 .IR mmap() ,
 163 .IR msync() ,
 164 .IR munmap()
 165 are present.
 166 .SS "ML - _POSIX_MEMLOCK - _SC_MEMLOCK"
 167 Shared memory can be locked into core. The functions
 168 .IR mlockall() ,
 169 .IR munlockall()
 170 are present.
 171 .SS "MR/MLR - _POSIX_MEMLOCK_RANGE - _SC_MEMLOCK_RANGE"
 172 More precisely, ranges can be locked into core. The functions
 173 .IR mlock() ,
 174 .IR munlock()
 175 are present.
 176 .SS "MPR - _POSIX_MEMORY_PROTECTION - _SC_MEMORY_PROTECTION"
 177 The function
 178 .I mprotect()
 179 is present.
 180 .SS "MSG - _POSIX_MESSAGE_PASSING - _SC_MESSAGE_PASSING"
 181 The include file
 182 .IR <mqueue.h>
 183 is present. The functions
 184 .br
 185 .nf
 186 .in +4
 187 .IR mq_close() ,
 188 .IR mq_getattr() ,
 189 .IR mq_notify() ,
 190 .IR mq_open() ,
 191 .IR mq_receive() ,
 192 .IR mq_send() ,
 193 .IR mq_setattr() ,
 194 .IR mq_unlink()
 195 .br
 196 .in -4
 197 .fi
 198 are present.
 199 .SS "MON - _POSIX_MONOTONIC_CLOCK - _SC_MONOTONIC_CLOCK"
 200 .nf
 201 CLOCK_MONOTONIC is supported.
 202 This option implies the _POSIX_TIMERS option.
 203 Affected functions are
 204 .in +4
 205 .IR aio_suspend() ,
 206 .IR clock_getres() ,
 207 .IR clock_gettime() ,
 208 .IR clock_settime() ,
 209 .IR timer_create() .
 210 .in -4
 211 .fi
 212 .SS "--- - _POSIX_MULTI_PROCESS - _SC_MULTI_PROCESS"
 213 This option has been deleted. Not in final XPG6.
 214 .\" .SS "MX"
 215 .\" IEC 60559 Floating-Point Option.
 216 .SS "--- - _POSIX_NO_TRUNC"
 217 If this option is in effect (as it always is under POSIX 1003.1-2001)
 218 then pathname components longer than NAME_MAX are not truncated,
 219 but give an error.
 220 This property may be dependent on the path prefix of the component.
 221 .SS "PIO - _POSIX_PRIORITIZED_IO - _SC_PRIORITIZED_IO"
 222 This option says that one can specify priorities for asynchronous I/O.
 223 This affects the functions
 224 .br
 225 .nf
 226 .in +4
 227 .IR aio_read() ,
 228 .IR aio_write() .
 229 .in -4
 230 .fi
 231 .SS "PS - _POSIX_PRIORITY_SCHEDULING - _SC_PRIORITY_SCHEDULING"
 232 The include file
 233 .I <sched.h>
 234 is present. The functions
 235 .br
 236 .nf
 237 .in +4
 238 .IR sched_get_priority_max() ,
 239 .IR sched_get_priority_min() ,
 240 .IR sched_getparam() ,
 241 .IR sched_getscheduler() ,
 242 .IR sched_rr_get_interval() ,
 243 .IR sched_setparam() ,
 244 .IR sched_setscheduler() ,
 245 .IR sched_yield()
 246 .in -4
 247 .br
 248 .fi
 249 are present.
 250 If also _POSIX_SPAWN is in effect, then the functions
 251 .br
 252 .nf
 253 .in +4
 254 .IR posix_spawnattr_getschedparam() ,
 255 .IR posix_spawnattr_getschedpolicy() ,
 256 .IR posix_spawnattr_setschedparam() ,
 257 .IR posix_spawnattr_setschedpolicy()
 258 .in -4
 259 are present.
 260 .fi
 261 .SS "RS - _POSIX_RAW_SOCKETS"
 262 Raw sockets are supported. Affected functions are
 263 .IR getsockopt() ,
 264 .IR setsockopt() .
 265 .SS "--- - _POSIX_READER_WRITER_LOCKS - _SC_READER_WRITER_LOCKS"
 266 This option implies the _POSIX_THREADS option. Conversely,
 267 under POSIX 1003.1-2001 the _POSIX_THREADS option implies this option.
 268 .nf
 269 The functions
 270 .in +4
 271 .IR pthread_rwlock_destroy() ,
 272 .IR pthread_rwlock_init() ,
 273 .IR pthread_rwlock_rdlock() ,
 274 .IR pthread_rwlock_tryrdlock() ,
 275 .IR pthread_rwlock_trywrlock() ,
 276 .IR pthread_rwlock_unlock() ,
 277 .IR pthread_rwlock_wrlock() ,
 278 .IR pthread_rwlockattr_destroy() ,
 279 .IR pthread_rwlockattr_init()
 280 .in -4
 281 are present.
 282 .fi
 283 .SS "RTS - _POSIX_REALTIME_SIGNALS - _SC_REALTIME_SIGNALS"
 284 Realtime signals are supported. The functions
 285 .br
 286 .nf
 287 .in +4
 288 .IR sigqueue() ,
 289 .IR sigtimedwait() ,
 290 .IR sigwaitinfo()
 291 .br
 292 .in -4
 293 .fi
 294 are present.
 295 .SS "--- - _POSIX_REGEXP - _SC_REGEXP"
 296 If this option is in effect (as it always is under POSIX 1003.1-2001)
 297 then POSIX regular expressions are supported and the functions
 298 .br
 299 .nf
 300 .in +4
 301 .IR regcomp() ,
 302 .IR regerror() ,
 303 .IR regexec() ,
 304 .IR regfree()
 305 .br
 306 .in -4
 307 .fi
 308 are present.
 309 .SS "--- - _POSIX_SAVED_IDS - _SC_SAVED_IDS"
 310 If this option is in effect (as it always is under POSIX 1003.1-2001)
 311 then a process has a saved set-user-ID and a saved set-group-ID.
 312 Affected functions are
 313 .br
 314 .nf
 315 .in +4
 316 .IR exec() ,
 317 .IR kill() ,
 318 .IR seteuid() ,
 319 .IR setegid() ,
 320 .IR setgid() ,
 321 .IR setuid() .
 322 .br
 323 .in -4
 324 .fi
 325 .\" .SS "SD"
 326 .\" Software development
 327 .SS "SEM - _POSIX_SEMAPHORES - _SC_SEMAPHORES"
 328 The include file
 329 .I <semaphore.h>
 330 is present.
 331 The functions
 332 .br
 333 .nf
 334 .in +4
 335 .IR sem_close() ,
 336 .IR sem_destroy() ,
 337 .IR sem_getvalue() ,
 338 .IR sem_init() ,
 339 .IR sem_open() ,
 340 .IR sem_post() ,
 341 .IR sem_trywait() ,
 342 .IR sem_unlink() ,
 343 .IR sem_wait()
 344 .br
 345 .in -4
 346 .fi
 347 are present.
 348 .SS "SHM - _POSIX_SHARED_MEMORY_OBJECTS - _SC_SHARED_MEMORY_OBJECTS"
 349 The functions
 350 .br
 351 .nf
 352 .in +4
 353 .IR mmap() ,
 354 .IR munmap() ,
 355 .IR shm_open() ,
 356 .IR shm_unlink()
 357 .br
 358 .in -4
 359 .fi
 360 are present.
 361 .SS "--- - _POSIX_SHELL - _SC_SHELL"
 362 If this option is in effect (as it always is under POSIX 1003.1-2001),
 363 the function
 364 .IR system()
 365 is present.
 366 .SS "SPN - _POSIX_SPAWN - _SC_SPAWN"
 367 This option describes support for process creation in a context where
 368 it is difficult or impossible to use
 369 .IR fork() ,
 370 e.g. because no MMU is present.
 371 If _POSIX_SPAWN is in effect, then the include file
 372 .I <spawn.h>
 373 and the functions
 374 .br
 375 .nf
 376 .in +4
 377 .IR posix_spawn() ,
 378 .IR posix_spawn_file_actions_addclose() ,
 379 .IR posix_spawn_file_actions_adddup2() ,
 380 .IR posix_spawn_file_actions_addopen() ,
 381 .IR posix_spawn_file_actions_destroy() ,
 382 .IR posix_spawn_file_actions_init() ,
 383 .IR posix_spawnattr_destroy() ,
 384 .IR posix_spawnattr_getsigdefault() ,
 385 .IR posix_spawnattr_getflags() ,
 386 .IR posix_spawnattr_getpgroup() ,
 387 .IR posix_spawnattr_getsigmask() ,
 388 .IR posix_spawnattr_init() ,
 389 .IR posix_spawnattr_setsigdefault() ,
 390 .IR posix_spawnattr_setflags() ,
 391 .IR posix_spawnattr_setpgroup() ,
 392 .IR posix_spawnattr_setsigmask() ,
 393 .IR posix_spawnp()
 394 .in -4
 395 .br
 396 .fi
 397 are present.
 398 If also _POSIX_PRIORITY_SCHEDULING is in effect, then
 399 the functions
 400 .br
 401 .nf
 402 .in +4
 403 .IR posix_spawnattr_getschedparam() ,
 404 .IR posix_spawnattr_getschedpolicy() ,
 405 .IR posix_spawnattr_setschedparam() ,
 406 .IR posix_spawnattr_setschedpolicy()
 407 .in -4
 408 are present.
 409 .fi
 410 .SS "SPI - _POSIX_SPIN_LOCKS - _SC_SPIN_LOCKS"
 411 This option implies the _POSIX_THREADS and
 412 _POSIX_THREAD_SAFE_FUNCTIONS options.
 413 The functions
 414 .br
 415 .nf
 416 .in +4
 417 .IR pthread_spin_destroy() ,
 418 .IR pthread_spin_init() ,
 419 .IR pthread_spin_lock() ,
 420 .IR pthread_spin_trylock() ,
 421 .IR pthread_spin_unlock()
 422 .in -4
 423 .br
 424 .fi
 425 are present.
 426 .SS "SS - _POSIX_SPORADIC_SERVER - _SC_SPORADIC_SERVER"
 427 The scheduling policy SCHED_SPORADIC is supported.
 428 This option implies the _POSIX_PRIORITY_SCHEDULING option.
 429 Affected functions are
 430 .br
 431 .nf
 432 .in +4
 433 .IR sched_setparam() ,
 434 .IR sched_setscheduler() .
 435 .in -4
 436 .br
 437 .fi
 438 .SS "SIO - _POSIX_SYNCHRONIZED_IO - _SC_SYNCHRONIZED_IO"
 439 Affected functions are
 440 .IR open() ,
 441 .IR msync() ,
 442 .IR fsync() ,
 443 .IR fdatasync() .
 444 .SS "TSA - _POSIX_THREAD_ATTR_STACKADDR - _SC_THREAD_ATTR_STACKADDR"
 445 Affected functions are
 446 .br
 447 .nf
 448 .in +4
 449 .IR pthread_attr_getstack() ,
 450 .IR pthread_attr_getstackaddr() ,
 451 .IR pthread_attr_setstack() ,
 452 .IR pthread_attr_setstackaddr() .
 453 .in -4
 454 .br
 455 .fi
 456 .SS "TSS - _POSIX_THREAD_ATTR_STACKSIZE - _SC_THREAD_ATTR_STACKSIZE"
 457 Affected functions are
 458 .br
 459 .nf
 460 .in +4
 461 .IR pthread_attr_getstack() ,
 462 .IR pthread_attr_getstacksize() ,
 463 .IR pthread_attr_setstack() ,
 464 .IR pthread_attr_setstacksize() .
 465 .in -4
 466 .br
 467 .fi
 468 .SS "TCT - _POSIX_THREAD_CPUTIME - _SC_THREAD_CPUTIME"
 469 The clockID CLOCK_THREAD_CPUTIME_ID is supported.
 470 This option implies the _POSIX_TIMERS option.
 471 Affected functions are
 472 .br
 473 .nf
 474 .in +4
 475 .IR pthread_getcpuclockid() ,
 476 .IR clock_getres() ,
 477 .IR clock_gettime() ,
 478 .IR clock_settime() ,
 479 .IR timer_create() .
 480 .in -4
 481 .br
 482 .fi
 483 .SS "TPI - _POSIX_THREAD_PRIO_INHERIT - _SC_THREAD_PRIO_INHERIT"
 484 Affected functions are
 485 .br
 486 .nf
 487 .in +4
 488 .IR pthread_mutexattr_getprotocol() ,
 489 .IR pthread_mutexattr_setprotocol() .
 490 .in -4
 491 .br
 492 .fi
 493 .SS "TPP - _POSIX_THREAD_PRIO_PROTECT - _SC_THREAD_PRIO_PROTECT"
 494 Affected functions are
 495 .br
 496 .nf
 497 .in +4
 498 .IR pthread_mutex_getprioceiling() ,
 499 .IR pthread_mutex_setprioceiling() ,
 500 .IR pthread_mutexattr_getprioceiling() ,
 501 .IR pthread_mutexattr_getprotocol() ,
 502 .IR pthread_mutexattr_setprioceiling() ,
 503 .IR pthread_mutexattr_setprotocol() .
 504 .in -4
 505 .br
 506 .fi
 507 .SS "TPS - _POSIX_THREAD_PRIORITY_SCHEDULING - _SC_THREAD_PRIORITY_SCHEDULING"
 508 If this option is in effect, the different threads inside a process
 509 can run with different priorities and/or different schedulers.
 510 Affected functions are
 511 .br
 512 .nf
 513 .in +4
 514 .IR pthread_attr_getinheritsched() ,
 515 .IR pthread_attr_getschedpolicy() ,
 516 .IR pthread_attr_getscope() ,
 517 .IR pthread_attr_setinheritsched() ,
 518 .IR pthread_attr_setschedpolicy() ,
 519 .IR pthread_attr_setscope() ,
 520 .IR pthread_getschedparam() ,
 521 .IR pthread_setschedparam() ,
 522 .IR pthread_setschedprio() .
 523 .in -4
 524 .br
 525 .fi
 526 .SS "TSH - _POSIX_THREAD_PROCESS_SHARED - _SC_THREAD_PROCESS_SHARED"
 527 Affected functions are
 528 .br
 529 .nf
 530 .in +4
 531 .IR pthread_barrierattr_getpshared() ,
 532 .IR pthread_barrierattr_setpshared() ,
 533 .IR pthread_condattr_getpshared() ,
 534 .IR pthread_condattr_setpshared() ,
 535 .IR pthread_mutexattr_getpshared() ,
 536 .IR pthread_mutexattr_setpshared() ,
 537 .IR pthread_rwlockattr_getpshared() ,
 538 .IR pthread_rwlockattr_setpshared() .
 539 .in -4
 540 .br
 541 .fi
 542 .SS "TSF - _POSIX_THREAD_SAFE_FUNCTIONS - _SC_THREAD_SAFE_FUNCTIONS"
 543 Affected functions are
 544 .br
 545 .nf
 546 .in +4
 547 .IR readdir_r() ,
 548 .IR getgrgid_r() ,
 549 .IR getgrnam_r() ,
 550 .IR getpwnam_r() ,
 551 .IR getpwuid_r() ,
 552 .IR flockfile() ,
 553 .IR ftrylockfile() ,
 554 .IR funlockfile() ,
 555 .IR getc_unlocked() ,
 556 .IR getchar_unlocked() ,
 557 .IR putc_unlocked() ,
 558 .IR putchar_unlocked() ,
 559 .IR rand_r() ,
 560 .IR strerror_r() ,
 561 .IR strtok_r() ,
 562 .IR asctime_r() ,
 563 .IR ctime_r() ,
 564 .IR gmtime_r() ,
 565 .IR localtime_r() .
 566 .in -4
 567 .br
 568 .fi
 569 .SS "TSP - _POSIX_THREAD_SPORADIC_SERVER - _SC_THREAD_SPORADIC_SERVER"
 570 This option implies the _POSIX_THREAD_PRIORITY_SCHEDULING option.
 571 Affected functions are
 572 .br
 573 .nf
 574 .in +4
 575 .IR sched_getparam() ,
 576 .IR sched_setparam() ,
 577 .IR sched_setscheduler() .
 578 .in -4
 579 .br
 580 .fi
 581 .SS "THR - _POSIX_THREADS - _SC_THREADS"
 582 Basic support for POSIX threads is available. The functions
 583 .br
 584 .nf
 585 .in +4
 586 .IR pthread_atfork() ,
 587 .IR pthread_attr_destroy() ,
 588 .IR pthread_attr_getdetachstate() ,
 589 .IR pthread_attr_getschedparam() ,
 590 .IR pthread_attr_init() ,
 591 .IR pthread_attr_setdetachstate() ,
 592 .IR pthread_attr_setschedparam() ,
 593 .IR pthread_cancel() ,
 594 .IR pthread_cleanup_push() ,
 595 .IR pthread_cleanup_pop() ,
 596 .IR pthread_cond_broadcast() ,
 597 .IR pthread_cond_destroy() ,
 598 .IR pthread_cond_init() ,
 599 .IR pthread_cond_signal() ,
 600 .IR pthread_cond_timedwait() ,
 601 .IR pthread_cond_wait() ,
 602 .IR pthread_condattr_destroy() ,
 603 .IR pthread_condattr_init() ,
 604 .IR pthread_create() ,
 605 .IR pthread_detach() ,
 606 .IR pthread_equal() ,
 607 .IR pthread_exit() ,
 608 .IR pthread_getspecific() ,
 609 .IR pthread_join( ,
 610 .IR pthread_key_create() ,
 611 .IR pthread_key_delete() ,
 612 .IR pthread_mutex_destroy() ,
 613 .IR pthread_mutex_init() ,
 614 .IR pthread_mutex_lock() ,
 615 .IR pthread_mutex_trylock() ,
 616 .IR pthread_mutex_unlock() ,
 617 .IR pthread_mutexattr_destroy() ,
 618 .IR pthread_mutexattr_init() ,
 619 .IR pthread_once() ,
 620 .IR pthread_rwlock_destroy() ,
 621 .IR pthread_rwlock_init() ,
 622 .IR pthread_rwlock_rdlock() ,
 623 .IR pthread_rwlock_tryrdlock() ,
 624 .IR pthread_rwlock_trywrlock() ,
 625 .IR pthread_rwlock_unlock() ,
 626 .IR pthread_rwlock_wrlock() ,
 627 .IR pthread_rwlockattr_destroy() ,
 628 .IR pthread_rwlockattr_init() ,
 629 .IR pthread_self() ,
 630 .IR pthread_setcancelstate() ,
 631 .IR pthread_setcanceltype() ,
 632 .IR pthread_setspecific() ,
 633 .IR pthread_testcancel()
 634 .in -4
 635 .br
 636 .fi
 637 are present.
 638 .SS "TMO - _POSIX_TIMEOUTS - _SC_TIMEOUTS"
 639 The functions
 640 .br
 641 .nf
 642 .in +4
 643 .IR mq_timedreceive() ,
 644 .IR mq_timedsend() ,
 645 .IR pthread_mutex_timedlock() ,
 646 .IR pthread_rwlock_timedrdlock() ,
 647 .IR pthread_rwlock_timedwrlock() ,
 648 .IR sem_timedwait() ,
 649 .IR posix_trace_timedgetnext_event()
 650 .in -4
 651 .br
 652 .fi
 653 are present.
 654 .SS "TMR - _POSIX_TIMERS - _SC_TIMERS"
 655 The functions
 656 .br
 657 .nf
 658 .in +4
 659 .IR clock_getres() ,
 660 .IR clock_gettime() ,
 661 .IR clock_settime() ,
 662 .IR nanosleep() ,
 663 .IR timer_create() ,
 664 .IR timer_delete() ,
 665 .IR timer_gettime() ,
 666 .IR timer_getoverrun() ,
 667 .IR timer_settime()
 668 .in -4
 669 .br
 670 .fi
 671 are present.
 672 .SS "TRC - _POSIX_TRACE - _SC_TRACE"
 673 POSIX tracing is available. The functions
 674 .br
 675 .nf
 676 .in +4
 677 .IR posix_trace_attr_destroy() ,
 678 .IR posix_trace_attr_getclockres() ,
 679 .IR posix_trace_attr_getcreatetime() ,
 680 .IR posix_trace_attr_getgenversion() ,
 681 .IR posix_trace_attr_getmaxdatasize() ,
 682 .IR posix_trace_attr_getmaxsystemeventsize() ,
 683 .IR posix_trace_attr_getmaxusereventsize() ,
 684 .IR posix_trace_attr_getname() ,
 685 .IR posix_trace_attr_getstreamfullpolicy() ,
 686 .IR posix_trace_attr_getstreamsize() ,
 687 .IR posix_trace_attr_init() ,
 688 .IR posix_trace_attr_setmaxdatasize() ,
 689 .IR posix_trace_attr_setname() ,
 690 .IR posix_trace_attr_setstreamsize() ,
 691 .IR posix_trace_attr_setstreamfullpolicy() ,
 692 .IR posix_trace_clear() ,
 693 .IR posix_trace_create() ,
 694 .IR posix_trace_event() ,
 695 .IR posix_trace_eventid_equal() ,
 696 .IR posix_trace_eventid_get_name() ,
 697 .IR posix_trace_eventid_open() ,
 698 .IR posix_trace_eventtypelist_getnext_id() ,
 699 .IR posix_trace_eventtypelist_rewind() ,
 700 .IR posix_trace_flush() ,
 701 .IR posix_trace_get_attr() ,
 702 .IR posix_trace_get_status() ,
 703 .IR posix_trace_getnext_event() ,
 704 .IR posix_trace_shutdown() ,
 705 .IR posix_trace_start() ,
 706 .IR posix_trace_stop() ,
 707 .IR posix_trace_trygetnext_event()
 708 .in -4
 709 .br
 710 .fi
 711 are present.
 712 .SS "TEF - _POSIX_TRACE_EVENT_FILTER - _SC_TRACE_EVENT_FILTER"
 713 This option implies the _POSIX_TRACE option.
 714 The functions
 715 .br
 716 .nf
 717 .in +4
 718 .IR posix_trace_eventset_add() ,
 719 .IR posix_trace_eventset_del() ,
 720 .IR posix_trace_eventset_empty() ,
 721 .IR posix_trace_eventset_fill() ,
 722 .IR posix_trace_eventset_ismember() ,
 723 .IR posix_trace_get_filter() ,
 724 .IR posix_trace_set_filter() ,
 725 .IR posix_trace_trid_eventid_open()
 726 .in -4
 727 .br
 728 .fi
 729 are present.
 730 .SS "TRI - _POSIX_TRACE_INHERIT - _SC_TRACE_INHERIT"
 731 Tracing children of the traced process is supported.
 732 This option implies the _POSIX_TRACE option.
 733 The functions
 734 .br
 735 .nf
 736 .in +4
 737 .IR posix_trace_attr_getinherited() ,
 738 .IR posix_trace_attr_setinherited()
 739 .in -4
 740 .br
 741 .fi
 742 are present.
 743 .SS "TRL - _POSIX_TRACE_LOG - _SC_TRACE_LOG"
 744 This option implies the _POSIX_TRACE option.
 745 The functions
 746 .br
 747 .nf
 748 .in +4
 749 .IR posix_trace_attr_getlogfullpolicy() ,
 750 .IR posix_trace_attr_getlogsize() ,
 751 .IR posix_trace_attr_setlogfullpolicy() ,
 752 .IR posix_trace_attr_setlogsize() ,
 753 .IR posix_trace_close() ,
 754 .IR posix_trace_create_withlog() ,
 755 .IR posix_trace_open() ,
 756 .IR posix_trace_rewind()
 757 .in -4
 758 .br
 759 .fi
 760 are present.
 761 .SS "TYM - _POSIX_TYPED_MEMORY_OBJECTS - _SC_TYPED_MEMORY_OBJECT"
 762 The functions
 763 .br
 764 .nf
 765 .in +4
 766 .IR posix_mem_offset() ,
 767 .IR posix_typed_mem_get_info() ,
 768 .IR posix_typed_mem_open()
 769 .in -4
 770 .br
 771 .fi
 772 are present.
 773 .SS "--- - _POSIX_VDISABLE"
 774 Always present (probably 0). Value to set a changeable special control
 775 character to to indicate that it is disabled.
 776
 777 .SH "XOPEN EXTENSIONS"
 778 .BR _XOPEN_CRYPT ,
 779 .BR _XOPEN_LEGACY ,
 780 .BR _XOPEN_REALTIME ,
 781 .BR _XOPEN_REALTIME_THREADS ,
 782 .BR _XOPEN_UNIX .
 783
 784 .\" To be described.
 785
 786 .SH "SEE ALSO"
 787 .BR sysconf (3)