1 /* Copyright (C) 1991-2022 Free Software Foundation, Inc. 2 This file is part of the GNU C Library. 3 4 The GNU C Library is free software; you can redistribute it and/or 5 modify it under the terms of the GNU Lesser General Public 6 License as published by the Free Software Foundation; either 7 version 2.1 of the License, or (at your option) any later version. 8 9 The GNU C Library is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 Lesser General Public License for more details. 13 14 You should have received a copy of the GNU Lesser General Public 15 License along with the GNU C Library; if not, see 16 <https://www.gnu.org/licenses/>. */ 17 18 /* 19 * POSIX Standard: 2.10 Symbolic Constants <unistd.h> 20 */ 21 22 #ifndef _UNISTD_H 23 #define _UNISTD_H 1 24 25 #include <features.h> 26 27 __BEGIN_DECLS 28 29 /* These may be used to determine what facilities are present at compile time. 30 Their values can be obtained at run time from `sysconf'. */ 31 32 #ifdef __USE_XOPEN2K8 33 /* POSIX Standard approved as ISO/IEC 9945-1 as of September 2008. */ 34 # define _POSIX_VERSION 200809L 35 #elif defined __USE_XOPEN2K 36 /* POSIX Standard approved as ISO/IEC 9945-1 as of December 2001. */ 37 # define _POSIX_VERSION 200112L 38 #elif defined __USE_POSIX199506 39 /* POSIX Standard approved as ISO/IEC 9945-1 as of June 1995. */ 40 # define _POSIX_VERSION 199506L 41 #elif defined __USE_POSIX199309 42 /* POSIX Standard approved as ISO/IEC 9945-1 as of September 1993. */ 43 # define _POSIX_VERSION 199309L 44 #else 45 /* POSIX Standard approved as ISO/IEC 9945-1 as of September 1990. */ 46 # define _POSIX_VERSION 199009L 47 #endif 48 49 /* These are not #ifdef __USE_POSIX2 because they are 50 in the theoretically application-owned namespace. */ 51 52 #ifdef __USE_XOPEN2K8 53 # define __POSIX2_THIS_VERSION 200809L 54 /* The utilities on GNU systems also correspond to this version. */ 55 #elif defined __USE_XOPEN2K 56 /* The utilities on GNU systems also correspond to this version. */ 57 # define __POSIX2_THIS_VERSION 200112L 58 #elif defined __USE_POSIX199506 59 /* The utilities on GNU systems also correspond to this version. */ 60 # define __POSIX2_THIS_VERSION 199506L 61 #else 62 /* The utilities on GNU systems also correspond to this version. */ 63 # define __POSIX2_THIS_VERSION 199209L 64 #endif 65 66 /* The utilities on GNU systems also correspond to this version. */ 67 #define _POSIX2_VERSION __POSIX2_THIS_VERSION 68 69 /* This symbol was required until the 2001 edition of POSIX. */ 70 #define _POSIX2_C_VERSION __POSIX2_THIS_VERSION 71 72 /* If defined, the implementation supports the 73 C Language Bindings Option. */ 74 #define _POSIX2_C_BIND __POSIX2_THIS_VERSION 75 76 /* If defined, the implementation supports the 77 C Language Development Utilities Option. */ 78 #define _POSIX2_C_DEV __POSIX2_THIS_VERSION 79 80 /* If defined, the implementation supports the 81 Software Development Utilities Option. */ 82 #define _POSIX2_SW_DEV __POSIX2_THIS_VERSION 83 84 /* If defined, the implementation supports the 85 creation of locales with the localedef utility. */ 86 #define _POSIX2_LOCALEDEF __POSIX2_THIS_VERSION 87 88 /* X/Open version number to which the library conforms. It is selectable. */ 89 #ifdef __USE_XOPEN2K8 90 # define _XOPEN_VERSION 700 91 #elif defined __USE_XOPEN2K 92 # define _XOPEN_VERSION 600 93 #elif defined __USE_UNIX98 94 # define _XOPEN_VERSION 500 95 #else 96 # define _XOPEN_VERSION 4 97 #endif 98 99 /* Commands and utilities from XPG4 are available. */ 100 #define _XOPEN_XCU_VERSION 4 101 102 /* We are compatible with the old published standards as well. */ 103 #define _XOPEN_XPG2 1 104 #define _XOPEN_XPG3 1 105 #define _XOPEN_XPG4 1 106 107 /* The X/Open Unix extensions are available. */ 108 #define _XOPEN_UNIX 1 109 110 /* The enhanced internationalization capabilities according to XPG4.2 111 are present. */ 112 #define _XOPEN_ENH_I18N 1 113 114 /* The legacy interfaces are also available. */ 115 #define _XOPEN_LEGACY 1 116 117 118 /* Get values of POSIX options: 119 120 If these symbols are defined, the corresponding features are 121 always available. If not, they may be available sometimes. 122 The current values can be obtained with `sysconf'. 123 124 _POSIX_JOB_CONTROL Job control is supported. 125 _POSIX_SAVED_IDS Processes have a saved set-user-ID 126 and a saved set-group-ID. 127 _POSIX_REALTIME_SIGNALS Real-time, queued signals are supported. 128 _POSIX_PRIORITY_SCHEDULING Priority scheduling is supported. 129 _POSIX_TIMERS POSIX.4 clocks and timers are supported. 130 _POSIX_ASYNCHRONOUS_IO Asynchronous I/O is supported. 131 _POSIX_PRIORITIZED_IO Prioritized asynchronous I/O is supported. 132 _POSIX_SYNCHRONIZED_IO Synchronizing file data is supported. 133 _POSIX_FSYNC The fsync function is present. 134 _POSIX_MAPPED_FILES Mapping of files to memory is supported. 135 _POSIX_MEMLOCK Locking of all memory is supported. 136 _POSIX_MEMLOCK_RANGE Locking of ranges of memory is supported. 137 _POSIX_MEMORY_PROTECTION Setting of memory protections is supported. 138 _POSIX_MESSAGE_PASSING POSIX.4 message queues are supported. 139 _POSIX_SEMAPHORES POSIX.4 counting semaphores are supported. 140 _POSIX_SHARED_MEMORY_OBJECTS POSIX.4 shared memory objects are supported. 141 _POSIX_THREADS POSIX.1c pthreads are supported. 142 _POSIX_THREAD_ATTR_STACKADDR Thread stack address attribute option supported. 143 _POSIX_THREAD_ATTR_STACKSIZE Thread stack size attribute option supported. 144 _POSIX_THREAD_SAFE_FUNCTIONS Thread-safe functions are supported. 145 _POSIX_THREAD_PRIORITY_SCHEDULING 146 POSIX.1c thread execution scheduling supported. 147 _POSIX_THREAD_PRIO_INHERIT Thread priority inheritance option supported. 148 _POSIX_THREAD_PRIO_PROTECT Thread priority protection option supported. 149 _POSIX_THREAD_PROCESS_SHARED Process-shared synchronization supported. 150 _POSIX_PII Protocol-independent interfaces are supported. 151 _POSIX_PII_XTI XTI protocol-indep. interfaces are supported. 152 _POSIX_PII_SOCKET Socket protocol-indep. interfaces are supported. 153 _POSIX_PII_INTERNET Internet family of protocols supported. 154 _POSIX_PII_INTERNET_STREAM Connection-mode Internet protocol supported. 155 _POSIX_PII_INTERNET_DGRAM Connectionless Internet protocol supported. 156 _POSIX_PII_OSI ISO/OSI family of protocols supported. 157 _POSIX_PII_OSI_COTS Connection-mode ISO/OSI service supported. 158 _POSIX_PII_OSI_CLTS Connectionless ISO/OSI service supported. 159 _POSIX_POLL Implementation supports `poll' function. 160 _POSIX_SELECT Implementation supports `select' and `pselect'. 161 162 _XOPEN_REALTIME X/Open realtime support is available. 163 _XOPEN_REALTIME_THREADS X/Open realtime thread support is available. 164 _XOPEN_SHM Shared memory interface according to XPG4.2. 165 166 _XBS5_ILP32_OFF32 Implementation provides environment with 32-bit 167 int, long, pointer, and off_t types. 168 _XBS5_ILP32_OFFBIG Implementation provides environment with 32-bit 169 int, long, and pointer and off_t with at least 170 64 bits. 171 _XBS5_LP64_OFF64 Implementation provides environment with 32-bit 172 int, and 64-bit long, pointer, and off_t types. 173 _XBS5_LPBIG_OFFBIG Implementation provides environment with at 174 least 32 bits int and long, pointer, and off_t 175 with at least 64 bits. 176 177 If any of these symbols is defined as -1, the corresponding option is not 178 true for any file. If any is defined as other than -1, the corresponding 179 option is true for all files. If a symbol is not defined at all, the value 180 for a specific file can be obtained from `pathconf' and `fpathconf'. 181 182 _POSIX_CHOWN_RESTRICTED Only the super user can use `chown' to change 183 the owner of a file. `chown' can only be used 184 to change the group ID of a file to a group of 185 which the calling process is a member. 186 _POSIX_NO_TRUNC Pathname components longer than 187 NAME_MAX generate an error. 188 _POSIX_VDISABLE If defined, if the value of an element of the 189 `c_cc' member of `struct termios' is 190 _POSIX_VDISABLE, no character will have the 191 effect associated with that element. 192 _POSIX_SYNC_IO Synchronous I/O may be performed. 193 _POSIX_ASYNC_IO Asynchronous I/O may be performed. 194 _POSIX_PRIO_IO Prioritized Asynchronous I/O may be performed. 195 196 Support for the Large File Support interface is not generally available. 197 If it is available the following constants are defined to one. 198 _LFS64_LARGEFILE Low-level I/O supports large files. 199 _LFS64_STDIO Standard I/O supports large files. 200 */ 201 202 #include <bits/posix_opt.h> 203 204 /* Get the environment definitions from Unix98. */ 205 #if defined __USE_UNIX98 || defined __USE_XOPEN2K 206 # include <bits/environments.h> 207 #endif 208 209 /* Standard file descriptors. */ 210 #define STDIN_FILENO 0 /* Standard input. */ 211 #define STDOUT_FILENO 1 /* Standard output. */ 212 #define STDERR_FILENO 2 /* Standard error output. */ 213 214 215 /* All functions that are not declared anywhere else. */ 216 217 #include <bits/types.h> 218 219 #ifndef __ssize_t_defined 220 typedef __ssize_t ssize_t; 221 # define __ssize_t_defined 222 #endif 223 224 #define __need_size_t 225 #define __need_NULL 226 #include <stddef.h> 227 228 #if defined __USE_XOPEN || defined __USE_XOPEN2K 229 /* The Single Unix specification says that some more types are 230 available here. */ 231 # ifndef __gid_t_defined 232 typedef __gid_t gid_t; 233 # define __gid_t_defined 234 # endif 235 236 # ifndef __uid_t_defined 237 typedef __uid_t uid_t; 238 # define __uid_t_defined 239 # endif 240 241 # ifndef __off_t_defined 242 # ifndef __USE_FILE_OFFSET64 243 typedef __off_t off_t; 244 # else 245 typedef __off64_t off_t; 246 # endif 247 # define __off_t_defined 248 # endif 249 # if defined __USE_LARGEFILE64 && !defined __off64_t_defined 250 typedef __off64_t off64_t; 251 # define __off64_t_defined 252 # endif 253 254 # ifndef __useconds_t_defined 255 typedef __useconds_t useconds_t; 256 # define __useconds_t_defined 257 # endif 258 259 # ifndef __pid_t_defined 260 typedef __pid_t pid_t; 261 # define __pid_t_defined 262 # endif 263 #endif /* X/Open */ 264 265 #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K 266 # ifndef __intptr_t_defined 267 typedef __intptr_t intptr_t; 268 # define __intptr_t_defined 269 # endif 270 #endif 271 272 #if defined __USE_MISC || defined __USE_XOPEN 273 # ifndef __socklen_t_defined 274 typedef __socklen_t socklen_t; 275 # define __socklen_t_defined 276 # endif 277 #endif 278 279 /* Values for the second argument to access. 280 These may be OR'd together. */ 281 #define R_OK 4 /* Test for read permission. */ 282 #define W_OK 2 /* Test for write permission. */ 283 #define X_OK 1 /* Test for execute permission. */ 284 #define F_OK 0 /* Test for existence. */ 285 286 /* Test for access to NAME using the real UID and real GID. */ 287 extern int access (const char *__name, int __type) __THROW __nonnull ((1)); 288 289 #ifdef __USE_GNU 290 /* Test for access to NAME using the effective UID and GID 291 (as normal file operations use). */ 292 extern int euidaccess (const char *__name, int __type) 293 __THROW __nonnull ((1)); 294 295 /* An alias for `euidaccess', used by some other systems. */ 296 extern int eaccess (const char *__name, int __type) 297 __THROW __nonnull ((1)); 298 299 /* Execute program relative to a directory file descriptor. */ 300 extern int execveat (int __fd, const char *__path, char *const __argv[], 301 char *const __envp[], int __flags) 302 __THROW __nonnull ((2, 3)); 303 #endif 304 305 #ifdef __USE_ATFILE 306 /* Test for access to FILE relative to the directory FD is open on. 307 If AT_EACCESS is set in FLAG, then use effective IDs like `eaccess', 308 otherwise use real IDs like `access'. */ 309 extern int faccessat (int __fd, const char *__file, int __type, int __flag) 310 __THROW __nonnull ((2)) __wur; 311 #endif /* Use GNU. */ 312 313 314 /* Values for the WHENCE argument to lseek. */ 315 #ifndef _STDIO_H /* <stdio.h> has the same definitions. */ 316 # define SEEK_SET 0 /* Seek from beginning of file. */ 317 # define SEEK_CUR 1 /* Seek from current position. */ 318 # define SEEK_END 2 /* Seek from end of file. */ 319 # ifdef __USE_GNU 320 # define SEEK_DATA 3 /* Seek to next data. */ 321 # define SEEK_HOLE 4 /* Seek to next hole. */ 322 # endif 323 #endif 324 325 #if defined __USE_MISC && !defined L_SET 326 /* Old BSD names for the same constants; just for compatibility. */ 327 # define L_SET SEEK_SET 328 # define L_INCR SEEK_CUR 329 # define L_XTND SEEK_END 330 #endif 331 332 333 /* Move FD's file position to OFFSET bytes from the 334 beginning of the file (if WHENCE is SEEK_SET), 335 the current position (if WHENCE is SEEK_CUR), 336 or the end of the file (if WHENCE is SEEK_END). 337 Return the new file position. */ 338 #ifndef __USE_FILE_OFFSET64 339 extern __off_t lseek (int __fd, __off_t __offset, int __whence) __THROW; 340 #else 341 # ifdef __REDIRECT_NTH 342 extern __off64_t __REDIRECT_NTH (lseek, 343 (int __fd, __off64_t __offset, int __whence), 344 lseek64); 345 # else 346 # define lseek lseek64 347 # endif 348 #endif 349 #ifdef __USE_LARGEFILE64 350 extern __off64_t lseek64 (int __fd, __off64_t __offset, int __whence) 351 __THROW; 352 #endif 353 354 /* Close the file descriptor FD. 355 356 This function is a cancellation point and therefore not marked with 357 __THROW. */ 358 extern int close (int __fd); 359 360 #ifdef __USE_MISC 361 /* Close all open file descriptors greater than or equal to LOWFD. 362 Negative LOWFD is clamped to 0. */ 363 extern void closefrom (int __lowfd) __THROW; 364 #endif 365 366 /* Read NBYTES into BUF from FD. Return the 367 number read, -1 for errors or 0 for EOF. 368 369 This function is a cancellation point and therefore not marked with 370 __THROW. */ 371 extern ssize_t read (int __fd, void *__buf, size_t __nbytes) __wur 372 __fortified_attr_access (__write_only__, 2, 3); 373 374 /* Write N bytes of BUF to FD. Return the number written, or -1. 375 376 This function is a cancellation point and therefore not marked with 377 __THROW. */ 378 extern ssize_t write (int __fd, const void *__buf, size_t __n) __wur 379 __attr_access ((__read_only__, 2, 3)); 380 381 #if defined __USE_UNIX98 || defined __USE_XOPEN2K8 382 # ifndef __USE_FILE_OFFSET64 383 /* Read NBYTES into BUF from FD at the given position OFFSET without 384 changing the file pointer. Return the number read, -1 for errors 385 or 0 for EOF. 386 387 This function is a cancellation point and therefore not marked with 388 __THROW. */ 389 extern ssize_t pread (int __fd, void *__buf, size_t __nbytes, 390 __off_t __offset) __wur 391 __fortified_attr_access (__write_only__, 2, 3); 392 393 /* Write N bytes of BUF to FD at the given position OFFSET without 394 changing the file pointer. Return the number written, or -1. 395 396 This function is a cancellation point and therefore not marked with 397 __THROW. */ 398 extern ssize_t pwrite (int __fd, const void *__buf, size_t __n, 399 __off_t __offset) __wur 400 __attr_access ((__read_only__, 2, 3)); 401 402 # else 403 # ifdef __REDIRECT 404 extern ssize_t __REDIRECT (pread, (int __fd, void *__buf, size_t __nbytes, 405 __off64_t __offset), 406 pread64) __wur 407 __fortified_attr_access (__write_only__, 2, 3); 408 extern ssize_t __REDIRECT (pwrite, (int __fd, const void *__buf, 409 size_t __nbytes, __off64_t __offset), 410 pwrite64) __wur 411 __attr_access ((__read_only__, 2, 3)); 412 # else 413 # define pread pread64 414 # define pwrite pwrite64 415 # endif 416 # endif 417 418 # ifdef __USE_LARGEFILE64 419 /* Read NBYTES into BUF from FD at the given position OFFSET without 420 changing the file pointer. Return the number read, -1 for errors 421 or 0 for EOF. */ 422 extern ssize_t pread64 (int __fd, void *__buf, size_t __nbytes, 423 __off64_t __offset) __wur 424 __fortified_attr_access (__write_only__, 2, 3); 425 /* Write N bytes of BUF to FD at the given position OFFSET without 426 changing the file pointer. Return the number written, or -1. */ 427 extern ssize_t pwrite64 (int __fd, const void *__buf, size_t __n, 428 __off64_t __offset) __wur 429 __attr_access ((__read_only__, 2, 3)); 430 # endif 431 #endif 432 433 /* Create a one-way communication channel (pipe). 434 If successful, two file descriptors are stored in PIPEDES; 435 bytes written on PIPEDES[1] can be read from PIPEDES[0]. 436 Returns 0 if successful, -1 if not. */ 437 extern int pipe (int __pipedes[2]) __THROW __wur; 438 439 #ifdef __USE_GNU 440 /* Same as pipe but apply flags passed in FLAGS to the new file 441 descriptors. */ 442 extern int pipe2 (int __pipedes[2], int __flags) __THROW __wur; 443 #endif 444 445 /* Schedule an alarm. In SECONDS seconds, the process will get a SIGALRM. 446 If SECONDS is zero, any currently scheduled alarm will be cancelled. 447 The function returns the number of seconds remaining until the last 448 alarm scheduled would have signaled, or zero if there wasn't one. 449 There is no return value to indicate an error, but you can set `errno' 450 to 0 and check its value after calling `alarm', and this might tell you. 451 The signal may come late due to processor scheduling. */ 452 extern unsigned int alarm (unsigned int __seconds) __THROW; 453 454 /* Make the process sleep for SECONDS seconds, or until a signal arrives 455 and is not ignored. The function returns the number of seconds less 456 than SECONDS which it actually slept (thus zero if it slept the full time). 457 If a signal handler does a `longjmp' or modifies the handling of the 458 SIGALRM signal while inside `sleep' call, the handling of the SIGALRM 459 signal afterwards is undefined. There is no return value to indicate 460 error, but if `sleep' returns SECONDS, it probably didn't work. 461 462 This function is a cancellation point and therefore not marked with 463 __THROW. */ 464 extern unsigned int sleep (unsigned int __seconds); 465 466 #if (defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K8) \ 467 || defined __USE_MISC 468 /* Set an alarm to go off (generating a SIGALRM signal) in VALUE 469 microseconds. If INTERVAL is nonzero, when the alarm goes off, the 470 timer is reset to go off every INTERVAL microseconds thereafter. 471 Returns the number of microseconds remaining before the alarm. */ 472 extern __useconds_t ualarm (__useconds_t __value, __useconds_t __interval) 473 __THROW; 474 475 /* Sleep USECONDS microseconds, or until a signal arrives that is not blocked 476 or ignored. 477 478 This function is a cancellation point and therefore not marked with 479 __THROW. */ 480 extern int usleep (__useconds_t __useconds); 481 #endif 482 483 484 /* Suspend the process until a signal arrives. 485 This always returns -1 and sets `errno' to EINTR. 486 487 This function is a cancellation point and therefore not marked with 488 __THROW. */ 489 extern int pause (void); 490 491 492 /* Change the owner and group of FILE. */ 493 extern int chown (const char *__file, __uid_t __owner, __gid_t __group) 494 __THROW __nonnull ((1)) __wur; 495 496 #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8 497 /* Change the owner and group of the file that FD is open on. */ 498 extern int fchown (int __fd, __uid_t __owner, __gid_t __group) __THROW __wur; 499 500 501 /* Change owner and group of FILE, if it is a symbolic 502 link the ownership of the symbolic link is changed. */ 503 extern int lchown (const char *__file, __uid_t __owner, __gid_t __group) 504 __THROW __nonnull ((1)) __wur; 505 506 #endif /* Use X/Open Unix. */ 507 508 #ifdef __USE_ATFILE 509 /* Change the owner and group of FILE relative to the directory FD is open 510 on. */ 511 extern int fchownat (int __fd, const char *__file, __uid_t __owner, 512 __gid_t __group, int __flag) 513 __THROW __nonnull ((2)) __wur; 514 #endif /* Use GNU. */ 515 516 /* Change the process's working directory to PATH. */ 517 extern int chdir (const char *__path) __THROW __nonnull ((1)) __wur; 518 519 #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8 520 /* Change the process's working directory to the one FD is open on. */ 521 extern int fchdir (int __fd) __THROW __wur; 522 #endif 523 524 /* Get the pathname of the current working directory, 525 and put it in SIZE bytes of BUF. Returns NULL if the 526 directory couldn't be determined or SIZE was too small. 527 If successful, returns BUF. In GNU, if BUF is NULL, 528 an array is allocated with `malloc'; the array is SIZE 529 bytes long, unless SIZE == 0, in which case it is as 530 big as necessary. */ 531 extern char *getcwd (char *__buf, size_t __size) __THROW __wur; 532 533 #ifdef __USE_GNU 534 /* Return a malloc'd string containing the current directory name. 535 If the environment variable `PWD' is set, and its value is correct, 536 that value is used. */ 537 extern char *get_current_dir_name (void) __THROW; 538 #endif 539 540 #if (defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K8) \ 541 || defined __USE_MISC 542 /* Put the absolute pathname of the current working directory in BUF. 543 If successful, return BUF. If not, put an error message in 544 BUF and return NULL. BUF should be at least PATH_MAX bytes long. */ 545 extern char *getwd (char *__buf) 546 __THROW __nonnull ((1)) __attribute_deprecated__ __wur 547 __attr_access ((__write_only__, 1)); 548 #endif 549 550 551 /* Duplicate FD, returning a new file descriptor on the same file. */ 552 extern int dup (int __fd) __THROW __wur; 553 554 /* Duplicate FD to FD2, closing FD2 and making it open on the same file. */ 555 extern int dup2 (int __fd, int __fd2) __THROW; 556 557 #ifdef __USE_GNU 558 /* Duplicate FD to FD2, closing FD2 and making it open on the same 559 file while setting flags according to FLAGS. */ 560 extern int dup3 (int __fd, int __fd2, int __flags) __THROW; 561 #endif 562 563 /* NULL-terminated array of "NAME=VALUE" environment variables. */ 564 extern char **__environ; 565 #ifdef __USE_GNU 566 extern char **environ; 567 #endif 568 569 570 /* Replace the current process, executing PATH with arguments ARGV and 571 environment ENVP. ARGV and ENVP are terminated by NULL pointers. */ 572 extern int execve (const char *__path, char *const __argv[], 573 char *const __envp[]) __THROW __nonnull ((1, 2)); 574 575 #ifdef __USE_XOPEN2K8 576 /* Execute the file FD refers to, overlaying the running program image. 577 ARGV and ENVP are passed to the new program, as for `execve'. */ 578 extern int fexecve (int __fd, char *const __argv[], char *const __envp[]) 579 __THROW __nonnull ((2)); 580 #endif 581 582 583 /* Execute PATH with arguments ARGV and environment from `environ'. */ 584 extern int execv (const char *__path, char *const __argv[]) 585 __THROW __nonnull ((1, 2)); 586 587 /* Execute PATH with all arguments after PATH until a NULL pointer, 588 and the argument after that for environment. */ 589 extern int execle (const char *__path, const char *__arg, ...) 590 __THROW __nonnull ((1, 2)); 591 592 /* Execute PATH with all arguments after PATH until 593 a NULL pointer and environment from `environ'. */ 594 extern int execl (const char *__path, const char *__arg, ...) 595 __THROW __nonnull ((1, 2)); 596 597 /* Execute FILE, searching in the `PATH' environment variable if it contains 598 no slashes, with arguments ARGV and environment from `environ'. */ 599 extern int execvp (const char *__file, char *const __argv[]) 600 __THROW __nonnull ((1, 2)); 601 602 /* Execute FILE, searching in the `PATH' environment variable if 603 it contains no slashes, with all arguments after FILE until a 604 NULL pointer and environment from `environ'. */ 605 extern int execlp (const char *__file, const char *__arg, ...) 606 __THROW __nonnull ((1, 2)); 607 608 #ifdef __USE_GNU 609 /* Execute FILE, searching in the `PATH' environment variable if it contains 610 no slashes, with arguments ARGV and environment from `environ'. */ 611 extern int execvpe (const char *__file, char *const __argv[], 612 char *const __envp[]) 613 __THROW __nonnull ((1, 2)); 614 #endif 615 616 617 #if defined __USE_MISC || defined __USE_XOPEN 618 /* Add INC to priority of the current process. */ 619 extern int nice (int __inc) __THROW __wur; 620 #endif 621 622 623 /* Terminate program execution with the low-order 8 bits of STATUS. */ 624 extern void _exit (int __status) __attribute__ ((__noreturn__)); 625 626 627 /* Get the `_PC_*' symbols for the NAME argument to `pathconf' and `fpathconf'; 628 the `_SC_*' symbols for the NAME argument to `sysconf'; 629 and the `_CS_*' symbols for the NAME argument to `confstr'. */ 630 #include <bits/confname.h> 631 632 /* Get file-specific configuration information about PATH. */ 633 extern long int pathconf (const char *__path, int __name) 634 __THROW __nonnull ((1)); 635 636 /* Get file-specific configuration about descriptor FD. */ 637 extern long int fpathconf (int __fd, int __name) __THROW; 638 639 /* Get the value of the system variable NAME. */ 640 extern long int sysconf (int __name) __THROW; 641 642 #ifdef __USE_POSIX2 643 /* Get the value of the string-valued system variable NAME. */ 644 extern size_t confstr (int __name, char *__buf, size_t __len) __THROW 645 __fortified_attr_access (__write_only__, 2, 3); 646 #endif 647 648 649 /* Get the process ID of the calling process. */ 650 extern __pid_t getpid (void) __THROW; 651 652 /* Get the process ID of the calling process's parent. */ 653 extern __pid_t getppid (void) __THROW; 654 655 /* Get the process group ID of the calling process. */ 656 extern __pid_t getpgrp (void) __THROW; 657 658 /* Get the process group ID of process PID. */ 659 extern __pid_t __getpgid (__pid_t __pid) __THROW; 660 #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8 661 extern __pid_t getpgid (__pid_t __pid) __THROW; 662 #endif 663 664 665 /* Set the process group ID of the process matching PID to PGID. 666 If PID is zero, the current process's process group ID is set. 667 If PGID is zero, the process ID of the process is used. */ 668 extern int setpgid (__pid_t __pid, __pid_t __pgid) __THROW; 669 670 #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED 671 /* Both System V and BSD have `setpgrp' functions, but with different 672 calling conventions. The BSD function is the same as POSIX.1 `setpgid' 673 (above). The System V function takes no arguments and puts the calling 674 process in its on group like `setpgid (0, 0)'. 675 676 New programs should always use `setpgid' instead. 677 678 GNU provides the POSIX.1 function. */ 679 680 /* Set the process group ID of the calling process to its own PID. 681 This is exactly the same as `setpgid (0, 0)'. */ 682 extern int setpgrp (void) __THROW; 683 684 #endif /* Use misc or X/Open. */ 685 686 /* Create a new session with the calling process as its leader. 687 The process group IDs of the session and the calling process 688 are set to the process ID of the calling process, which is returned. */ 689 extern __pid_t setsid (void) __THROW; 690 691 #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8 692 /* Return the session ID of the given process. */ 693 extern __pid_t getsid (__pid_t __pid) __THROW; 694 #endif 695 696 /* Get the real user ID of the calling process. */ 697 extern __uid_t getuid (void) __THROW; 698 699 /* Get the effective user ID of the calling process. */ 700 extern __uid_t geteuid (void) __THROW; 701 702 /* Get the real group ID of the calling process. */ 703 extern __gid_t getgid (void) __THROW; 704 705 /* Get the effective group ID of the calling process. */ 706 extern __gid_t getegid (void) __THROW; 707 708 /* If SIZE is zero, return the number of supplementary groups 709 the calling process is in. Otherwise, fill in the group IDs 710 of its supplementary groups in LIST and return the number written. */ 711 extern int getgroups (int __size, __gid_t __list[]) __THROW __wur 712 __fortified_attr_access (__write_only__, 2, 1); 713 #ifdef __USE_GNU 714 /* Return nonzero iff the calling process is in group GID. */ 715 extern int group_member (__gid_t __gid) __THROW; 716 #endif 717 718 /* Set the user ID of the calling process to UID. 719 If the calling process is the super-user, set the real 720 and effective user IDs, and the saved set-user-ID to UID; 721 if not, the effective user ID is set to UID. */ 722 extern int setuid (__uid_t __uid) __THROW __wur; 723 724 #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED 725 /* Set the real user ID of the calling process to RUID, 726 and the effective user ID of the calling process to EUID. */ 727 extern int setreuid (__uid_t __ruid, __uid_t __euid) __THROW __wur; 728 #endif 729 730 #ifdef __USE_XOPEN2K 731 /* Set the effective user ID of the calling process to UID. */ 732 extern int seteuid (__uid_t __uid) __THROW __wur; 733 #endif /* Use POSIX.1-2001. */ 734 735 /* Set the group ID of the calling process to GID. 736 If the calling process is the super-user, set the real 737 and effective group IDs, and the saved set-group-ID to GID; 738 if not, the effective group ID is set to GID. */ 739 extern int setgid (__gid_t __gid) __THROW __wur; 740 741 #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED 742 /* Set the real group ID of the calling process to RGID, 743 and the effective group ID of the calling process to EGID. */ 744 extern int setregid (__gid_t __rgid, __gid_t __egid) __THROW __wur; 745 #endif 746 747 #ifdef __USE_XOPEN2K 748 /* Set the effective group ID of the calling process to GID. */ 749 extern int setegid (__gid_t __gid) __THROW __wur; 750 #endif /* Use POSIX.1-2001. */ 751 752 #ifdef __USE_GNU 753 /* Fetch the real user ID, effective user ID, and saved-set user ID, 754 of the calling process. */ 755 extern int getresuid (__uid_t *__ruid, __uid_t *__euid, __uid_t *__suid) 756 __THROW; 757 758 /* Fetch the real group ID, effective group ID, and saved-set group ID, 759 of the calling process. */ 760 extern int getresgid (__gid_t *__rgid, __gid_t *__egid, __gid_t *__sgid) 761 __THROW; 762 763 /* Set the real user ID, effective user ID, and saved-set user ID, 764 of the calling process to RUID, EUID, and SUID, respectively. */ 765 extern int setresuid (__uid_t __ruid, __uid_t __euid, __uid_t __suid) 766 __THROW __wur; 767 768 /* Set the real group ID, effective group ID, and saved-set group ID, 769 of the calling process to RGID, EGID, and SGID, respectively. */ 770 extern int setresgid (__gid_t __rgid, __gid_t __egid, __gid_t __sgid) 771 __THROW __wur; 772 #endif 773 774 775 /* Clone the calling process, creating an exact copy. 776 Return -1 for errors, 0 to the new process, 777 and the process ID of the new process to the old process. */ 778 extern __pid_t fork (void) __THROWNL; 779 780 #if (defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K8) \ 781 || defined __USE_MISC 782 /* Clone the calling process, but without copying the whole address space. 783 The calling process is suspended until the new process exits or is 784 replaced by a call to `execve'. Return -1 for errors, 0 to the new process, 785 and the process ID of the new process to the old process. */ 786 extern __pid_t vfork (void) __THROW; 787 #endif /* Use misc or XPG < 7. */ 788 789 #ifdef __USE_GNU 790 /* This is similar to fork, however it does not run the atfork handlers 791 neither reinitialize any internal locks in multithread case. 792 Different than fork, _Fork is async-signal-safe. */ 793 extern __pid_t _Fork (void) __THROW; 794 #endif 795 796 797 /* Return the pathname of the terminal FD is open on, or NULL on errors. 798 The returned storage is good only until the next call to this function. */ 799 extern char *ttyname (int __fd) __THROW; 800 801 /* Store at most BUFLEN characters of the pathname of the terminal FD is 802 open on in BUF. Return 0 on success, otherwise an error number. */ 803 extern int ttyname_r (int __fd, char *__buf, size_t __buflen) 804 __THROW __nonnull ((2)) __wur 805 __fortified_attr_access (__write_only__, 2, 3); 806 807 /* Return 1 if FD is a valid descriptor associated 808 with a terminal, zero if not. */ 809 extern int isatty (int __fd) __THROW; 810 811 #ifdef __USE_MISC 812 /* Return the index into the active-logins file (utmp) for 813 the controlling terminal. */ 814 extern int ttyslot (void) __THROW; 815 #endif 816 817 818 /* Make a link to FROM named TO. */ 819 extern int link (const char *__from, const char *__to) 820 __THROW __nonnull ((1, 2)) __wur; 821 822 #ifdef __USE_ATFILE 823 /* Like link but relative paths in TO and FROM are interpreted relative 824 to FROMFD and TOFD respectively. */ 825 extern int linkat (int __fromfd, const char *__from, int __tofd, 826 const char *__to, int __flags) 827 __THROW __nonnull ((2, 4)) __wur; 828 #endif 829 830 #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K 831 /* Make a symbolic link to FROM named TO. */ 832 extern int symlink (const char *__from, const char *__to) 833 __THROW __nonnull ((1, 2)) __wur; 834 835 /* Read the contents of the symbolic link PATH into no more than 836 LEN bytes of BUF. The contents are not null-terminated. 837 Returns the number of characters read, or -1 for errors. */ 838 extern ssize_t readlink (const char *__restrict __path, 839 char *__restrict __buf, size_t __len) 840 __THROW __nonnull ((1, 2)) __wur 841 __fortified_attr_access (__write_only__, 2, 3); 842 843 #endif /* Use POSIX.1-2001. */ 844 845 #ifdef __USE_ATFILE 846 /* Like symlink but a relative path in TO is interpreted relative to TOFD. */ 847 extern int symlinkat (const char *__from, int __tofd, 848 const char *__to) __THROW __nonnull ((1, 3)) __wur; 849 850 /* Like readlink but a relative PATH is interpreted relative to FD. */ 851 extern ssize_t readlinkat (int __fd, const char *__restrict __path, 852 char *__restrict __buf, size_t __len) 853 __THROW __nonnull ((2, 3)) __wur 854 __fortified_attr_access (__write_only__, 3, 4); 855 #endif 856 857 /* Remove the link NAME. */ 858 extern int unlink (const char *__name) __THROW __nonnull ((1)); 859 860 #ifdef __USE_ATFILE 861 /* Remove the link NAME relative to FD. */ 862 extern int unlinkat (int __fd, const char *__name, int __flag) 863 __THROW __nonnull ((2)); 864 #endif 865 866 /* Remove the directory PATH. */ 867 extern int rmdir (const char *__path) __THROW __nonnull ((1)); 868 869 870 /* Return the foreground process group ID of FD. */ 871 extern __pid_t tcgetpgrp (int __fd) __THROW; 872 873 /* Set the foreground process group ID of FD set PGRP_ID. */ 874 extern int tcsetpgrp (int __fd, __pid_t __pgrp_id) __THROW; 875 876 877 /* Return the login name of the user. 878 879 This function is a possible cancellation point and therefore not 880 marked with __THROW. */ 881 extern char *getlogin (void); 882 #ifdef __USE_POSIX199506 883 /* Return at most NAME_LEN characters of the login name of the user in NAME. 884 If it cannot be determined or some other error occurred, return the error 885 code. Otherwise return 0. 886 887 This function is a possible cancellation point and therefore not 888 marked with __THROW. */ 889 extern int getlogin_r (char *__name, size_t __name_len) __nonnull ((1)) 890 __fortified_attr_access (__write_only__, 1, 2); 891 #endif 892 893 #ifdef __USE_MISC 894 /* Set the login name returned by `getlogin'. */ 895 extern int setlogin (const char *__name) __THROW __nonnull ((1)); 896 #endif 897 898 899 #ifdef __USE_POSIX2 900 /* Get definitions and prototypes for functions to process the 901 arguments in ARGV (ARGC of them, minus the program name) for 902 options given in OPTS. */ 903 # include <bits/getopt_posix.h> 904 #endif 905 906 907 #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K 908 /* Put the name of the current host in no more than LEN bytes of NAME. 909 The result is null-terminated if LEN is large enough for the full 910 name and the terminator. */ 911 extern int gethostname (char *__name, size_t __len) __THROW __nonnull ((1)) 912 __fortified_attr_access (__write_only__, 1, 2); 913 #endif 914 915 916 #if defined __USE_MISC 917 /* Set the name of the current host to NAME, which is LEN bytes long. 918 This call is restricted to the super-user. */ 919 extern int sethostname (const char *__name, size_t __len) 920 __THROW __nonnull ((1)) __wur __attr_access ((__read_only__, 1, 2)); 921 922 /* Set the current machine's Internet number to ID. 923 This call is restricted to the super-user. */ 924 extern int sethostid (long int __id) __THROW __wur; 925 926 927 /* Get and set the NIS (aka YP) domain name, if any. 928 Called just like `gethostname' and `sethostname'. 929 The NIS domain name is usually the empty string when not using NIS. */ 930 extern int getdomainname (char *__name, size_t __len) 931 __THROW __nonnull ((1)) __wur 932 __fortified_attr_access (__write_only__, 1, 2); 933 extern int setdomainname (const char *__name, size_t __len) 934 __THROW __nonnull ((1)) __wur __attr_access ((__read_only__, 1, 2)); 935 936 /* Revoke access permissions to all processes currently communicating 937 with the control terminal, and then send a SIGHUP signal to the process 938 group of the control terminal. */ 939 extern int vhangup (void) __THROW; 940 941 /* Revoke the access of all descriptors currently open on FILE. */ 942 extern int revoke (const char *__file) __THROW __nonnull ((1)) __wur; 943 944 945 /* Enable statistical profiling, writing samples of the PC into at most 946 SIZE bytes of SAMPLE_BUFFER; every processor clock tick while profiling 947 is enabled, the system examines the user PC and increments 948 SAMPLE_BUFFER[((PC - OFFSET) / 2) * SCALE / 65536]. If SCALE is zero, 949 disable profiling. Returns zero on success, -1 on error. */ 950 extern int profil (unsigned short int *__sample_buffer, size_t __size, 951 size_t __offset, unsigned int __scale) 952 __THROW __nonnull ((1)); 953 954 955 /* Turn accounting on if NAME is an existing file. The system will then write 956 a record for each process as it terminates, to this file. If NAME is NULL, 957 turn accounting off. This call is restricted to the super-user. */ 958 extern int acct (const char *__name) __THROW; 959 960 961 /* Successive calls return the shells listed in `/etc/shells'. */ 962 extern char *getusershell (void) __THROW; 963 extern void endusershell (void) __THROW; /* Discard cached info. */ 964 extern void setusershell (void) __THROW; /* Rewind and re-read the file. */ 965 966 967 /* Put the program in the background, and dissociate from the controlling 968 terminal. If NOCHDIR is zero, do `chdir ("/")'. If NOCLOSE is zero, 969 redirects stdin, stdout, and stderr to /dev/null. */ 970 extern int daemon (int __nochdir, int __noclose) __THROW __wur; 971 #endif /* Use misc. */ 972 973 974 #if defined __USE_MISC || (defined __USE_XOPEN && !defined __USE_XOPEN2K) 975 /* Make PATH be the root directory (the starting point for absolute paths). 976 This call is restricted to the super-user. */ 977 extern int chroot (const char *__path) __THROW __nonnull ((1)) __wur; 978 979 /* Prompt with PROMPT and read a string from the terminal without echoing. 980 Uses /dev/tty if possible; otherwise stderr and stdin. */ 981 extern char *getpass (const char *__prompt) __nonnull ((1)); 982 #endif /* Use misc || X/Open. */ 983 984 985 /* Make all changes done to FD actually appear on disk. 986 987 This function is a cancellation point and therefore not marked with 988 __THROW. */ 989 extern int fsync (int __fd); 990 991 992 #ifdef __USE_GNU 993 /* Make all changes done to all files on the file system associated 994 with FD actually appear on disk. */ 995 extern int syncfs (int __fd) __THROW; 996 #endif 997 998 999 #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED 1000 1001 /* Return identifier for the current host. */ 1002 extern long int gethostid (void); 1003 1004 /* Make all changes done to all files actually appear on disk. */ 1005 extern void sync (void) __THROW; 1006 1007 1008 # if defined __USE_MISC || !defined __USE_XOPEN2K 1009 /* Return the number of bytes in a page. This is the system's page size, 1010 which is not necessarily the same as the hardware page size. */ 1011 extern int getpagesize (void) __THROW __attribute__ ((__const__)); 1012 1013 1014 /* Return the maximum number of file descriptors 1015 the current process could possibly have. */ 1016 extern int getdtablesize (void) __THROW; 1017 # endif 1018 1019 #endif /* Use misc || X/Open Unix. */ 1020 1021 1022 #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8 1023 1024 /* Truncate FILE to LENGTH bytes. */ 1025 # ifndef __USE_FILE_OFFSET64 1026 extern int truncate (const char *__file, __off_t __length) 1027 __THROW __nonnull ((1)) __wur; 1028 # else 1029 # ifdef __REDIRECT_NTH 1030 extern int __REDIRECT_NTH (truncate, 1031 (const char *__file, __off64_t __length), 1032 truncate64) __nonnull ((1)) __wur; 1033 # else 1034 # define truncate truncate64 1035 # endif 1036 # endif 1037 # ifdef __USE_LARGEFILE64 1038 extern int truncate64 (const char *__file, __off64_t __length) 1039 __THROW __nonnull ((1)) __wur; 1040 # endif 1041 1042 #endif /* Use X/Open Unix || POSIX 2008. */ 1043 1044 #if defined __USE_POSIX199309 \ 1045 || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K 1046 1047 /* Truncate the file FD is open on to LENGTH bytes. */ 1048 # ifndef __USE_FILE_OFFSET64 1049 extern int ftruncate (int __fd, __off_t __length) __THROW __wur; 1050 # else 1051 # ifdef __REDIRECT_NTH 1052 extern int __REDIRECT_NTH (ftruncate, (int __fd, __off64_t __length), 1053 ftruncate64) __wur; 1054 # else 1055 # define ftruncate ftruncate64 1056 # endif 1057 # endif 1058 # ifdef __USE_LARGEFILE64 1059 extern int ftruncate64 (int __fd, __off64_t __length) __THROW __wur; 1060 # endif 1061 1062 #endif /* Use POSIX.1b || X/Open Unix || XPG6. */ 1063 1064 1065 #if (defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K) \ 1066 || defined __USE_MISC 1067 1068 /* Set the end of accessible data space (aka "the break") to ADDR. 1069 Returns zero on success and -1 for errors (with errno set). */ 1070 extern int brk (void *__addr) __THROW __wur; 1071 1072 /* Increase or decrease the end of accessible data space by DELTA bytes. 1073 If successful, returns the address the previous end of data space 1074 (i.e. the beginning of the new space, if DELTA > 0); 1075 returns (void *) -1 for errors (with errno set). */ 1076 extern void *sbrk (intptr_t __delta) __THROW; 1077 #endif 1078 1079 1080 #ifdef __USE_MISC 1081 /* Invoke `system call' number SYSNO, passing it the remaining arguments. 1082 This is completely system-dependent, and not often useful. 1083 1084 In Unix, `syscall' sets `errno' for all errors and most calls return -1 1085 for errors; in many systems you cannot pass arguments or get return 1086 values for all system calls (`pipe', `fork', and `getppid' typically 1087 among them). 1088 1089 In Mach, all system calls take normal arguments and always return an 1090 error code (zero for success). */ 1091 extern long int syscall (long int __sysno, ...) __THROW; 1092 1093 #endif /* Use misc. */ 1094 1095 1096 #if (defined __USE_MISC || defined __USE_XOPEN_EXTENDED) && !defined F_LOCK 1097 /* NOTE: These declarations also appear in <fcntl.h>; be sure to keep both 1098 files consistent. Some systems have them there and some here, and some 1099 software depends on the macros being defined without including both. */ 1100 1101 /* `lockf' is a simpler interface to the locking facilities of `fcntl'. 1102 LEN is always relative to the current file position. 1103 The CMD argument is one of the following. 1104 1105 This function is a cancellation point and therefore not marked with 1106 __THROW. */ 1107 1108 # define F_ULOCK 0 /* Unlock a previously locked region. */ 1109 # define F_LOCK 1 /* Lock a region for exclusive use. */ 1110 # define F_TLOCK 2 /* Test and lock a region for exclusive use. */ 1111 # define F_TEST 3 /* Test a region for other processes locks. */ 1112 1113 # ifndef __USE_FILE_OFFSET64 1114 extern int lockf (int __fd, int __cmd, __off_t __len) __wur; 1115 # else 1116 # ifdef __REDIRECT 1117 extern int __REDIRECT (lockf, (int __fd, int __cmd, __off64_t __len), 1118 lockf64) __wur; 1119 # else 1120 # define lockf lockf64 1121 # endif 1122 # endif 1123 # ifdef __USE_LARGEFILE64 1124 extern int lockf64 (int __fd, int __cmd, __off64_t __len) __wur; 1125 # endif 1126 #endif /* Use misc and F_LOCK not already defined. */ 1127 1128 1129 #ifdef __USE_GNU 1130 1131 /* Evaluate EXPRESSION, and repeat as long as it returns -1 with `errno' 1132 set to EINTR. */ 1133 1134 # define TEMP_FAILURE_RETRY(expression) \ 1135 (__extension__ \ 1136 ({ long int __result; \ 1137 do __result = (long int) (expression); \ 1138 while (__result == -1L && errno == EINTR); \ 1139 __result; })) 1140 1141 /* Copy LENGTH bytes from INFD to OUTFD. */ 1142 ssize_t copy_file_range (int __infd, __off64_t *__pinoff, 1143 int __outfd, __off64_t *__poutoff, 1144 size_t __length, unsigned int __flags); 1145 #endif /* __USE_GNU */ 1146 1147 #if defined __USE_POSIX199309 || defined __USE_UNIX98 1148 /* Synchronize at least the data part of a file with the underlying 1149 media. */ 1150 extern int fdatasync (int __fildes); 1151 #endif /* Use POSIX199309 */ 1152 1153 #ifdef __USE_MISC 1154 /* One-way hash PHRASE, returning a string suitable for storage in the 1155 user database. SALT selects the one-way function to use, and 1156 ensures that no two users' hashes are the same, even if they use 1157 the same passphrase. The return value points to static storage 1158 which will be overwritten by the next call to crypt. */ 1159 extern char *crypt (const char *__key, const char *__salt) 1160 __THROW __nonnull ((1, 2)); 1161 #endif 1162 1163 #ifdef __USE_XOPEN 1164 /* Swab pairs bytes in the first N bytes of the area pointed to by 1165 FROM and copy the result to TO. The value of TO must not be in the 1166 range [FROM - N + 1, FROM - 1]. If N is odd the first byte in FROM 1167 is without partner. */ 1168 extern void swab (const void *__restrict __from, void *__restrict __to, 1169 ssize_t __n) __THROW __nonnull ((1, 2)) 1170 __attr_access ((__read_only__, 1, 3)) 1171 __attr_access ((__write_only__, 2, 3)); 1172 #endif 1173 1174 1175 /* Prior to Issue 6, the Single Unix Specification required these 1176 prototypes to appear in this header. They are also found in 1177 <stdio.h>. */ 1178 #if defined __USE_XOPEN && !defined __USE_XOPEN2K 1179 /* Return the name of the controlling terminal. */ 1180 extern char *ctermid (char *__s) __THROW; 1181 1182 /* Return the name of the current user. */ 1183 extern char *cuserid (char *__s); 1184 #endif 1185 1186 1187 /* Unix98 requires this function to be declared here. In other 1188 standards it is in <pthread.h>. */ 1189 #if defined __USE_UNIX98 && !defined __USE_XOPEN2K 1190 extern int pthread_atfork (void (*__prepare) (void), 1191 void (*__parent) (void), 1192 void (*__child) (void)) __THROW; 1193 #endif 1194 1195 #ifdef __USE_MISC 1196 /* Write LENGTH bytes of randomness starting at BUFFER. Return 0 on 1197 success or -1 on error. */ 1198 int getentropy (void *__buffer, size_t __length) __wur 1199 __attr_access ((__write_only__, 1, 2)); 1200 #endif 1201 1202 #ifdef __USE_GNU 1203 /* Close all file descriptors in the range FD up to MAX_FD. The flag FLAGS 1204 are define by the CLOSE_RANGE prefix. This function behaves like close 1205 on the range and gaps where the file descriptor is invalid or errors 1206 encountered while closing file descriptors are ignored. Returns 0 on 1207 successor or -1 for failure (and sets errno accordingly). */ 1208 extern int close_range (unsigned int __fd, unsigned int __max_fd, 1209 int __flags) __THROW; 1210 #endif 1211 1212 /* Define some macros helping to catch buffer overflows. */ 1213 #if __USE_FORTIFY_LEVEL > 0 && defined __fortify_function 1214 # include <bits/unistd.h> 1215 #endif 1216 1217 /* System-specific extensions. */ 1218 #include <bits/unistd_ext.h> 1219 1220 __END_DECLS 1221 1222 #endif /* unistd.h */ 1223