1 /* Copyright (C) 1991-2009, 2010, 2011 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, write to the Free 16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 17 02111-1307 USA. */ 18 19 /* 20 * POSIX Standard: 2.10 Symbolic Constants <unistd.h> 21 */ 22 23 #ifndef _UNISTD_H 24 #define _UNISTD_H 1 25 26 #include <features.h> 27 28 __BEGIN_DECLS 29 30 /* These may be used to determine what facilities are present at compile time. 31 Their values can be obtained at run time from `sysconf'. */ 32 33 #ifdef __USE_XOPEN2K8 34 /* POSIX Standard approved as ISO/IEC 9945-1 as of September 2008. */ 35 # define _POSIX_VERSION 200809L 36 #elif defined __USE_XOPEN2K 37 /* POSIX Standard approved as ISO/IEC 9945-1 as of December 2001. */ 38 # define _POSIX_VERSION 200112L 39 #elif defined __USE_POSIX199506 40 /* POSIX Standard approved as ISO/IEC 9945-1 as of June 1995. */ 41 # define _POSIX_VERSION 199506L 42 #elif defined __USE_POSIX199309 43 /* POSIX Standard approved as ISO/IEC 9945-1 as of September 1993. */ 44 # define _POSIX_VERSION 199309L 45 #else 46 /* POSIX Standard approved as ISO/IEC 9945-1 as of September 1990. */ 47 # define _POSIX_VERSION 199009L 48 #endif 49 50 /* These are not #ifdef __USE_POSIX2 because they are 51 in the theoretically application-owned namespace. */ 52 53 #ifdef __USE_XOPEN2K8 54 # define __POSIX2_THIS_VERSION 200809L 55 /* The utilities on GNU systems also correspond to this version. */ 56 #elif defined __USE_XOPEN2K 57 /* The utilities on GNU systems also correspond to this version. */ 58 # define __POSIX2_THIS_VERSION 200112L 59 #elif defined __USE_POSIX199506 60 /* The utilities on GNU systems also correspond to this version. */ 61 # define __POSIX2_THIS_VERSION 199506L 62 #else 63 /* The utilities on GNU systems also correspond to this version. */ 64 # define __POSIX2_THIS_VERSION 199209L 65 #endif 66 67 /* The utilities on GNU systems also correspond to this version. */ 68 #define _POSIX2_VERSION __POSIX2_THIS_VERSION 69 70 /* If defined, the implementation supports the 71 C Language Bindings Option. */ 72 #define _POSIX2_C_BIND __POSIX2_THIS_VERSION 73 74 /* If defined, the implementation supports the 75 C Language Development Utilities Option. */ 76 #define _POSIX2_C_DEV __POSIX2_THIS_VERSION 77 78 /* If defined, the implementation supports the 79 Software Development Utilities Option. */ 80 #define _POSIX2_SW_DEV __POSIX2_THIS_VERSION 81 82 /* If defined, the implementation supports the 83 creation of locales with the localedef utility. */ 84 #define _POSIX2_LOCALEDEF __POSIX2_THIS_VERSION 85 86 /* X/Open version number to which the library conforms. It is selectable. */ 87 #ifdef __USE_XOPEN2K8 88 # define _XOPEN_VERSION 700 89 #elif defined __USE_XOPEN2K 90 # define _XOPEN_VERSION 600 91 #elif defined __USE_UNIX98 92 # define _XOPEN_VERSION 500 93 #else 94 # define _XOPEN_VERSION 4 95 #endif 96 97 /* Commands and utilities from XPG4 are available. */ 98 #define _XOPEN_XCU_VERSION 4 99 100 /* We are compatible with the old published standards as well. */ 101 #define _XOPEN_XPG2 1 102 #define _XOPEN_XPG3 1 103 #define _XOPEN_XPG4 1 104 105 /* The X/Open Unix extensions are available. */ 106 #define _XOPEN_UNIX 1 107 108 /* Encryption is present. */ 109 #define _XOPEN_CRYPT 1 110 111 /* The enhanced internationalization capabilities according to XPG4.2 112 are present. */ 113 #define _XOPEN_ENH_I18N 1 114 115 /* The legacy interfaces are also available. */ 116 #define _XOPEN_LEGACY 1 117 118 119 /* Get values of POSIX options: 120 121 If these symbols are defined, the corresponding features are 122 always available. If not, they may be available sometimes. 123 The current values can be obtained with `sysconf'. 124 125 _POSIX_JOB_CONTROL Job control is supported. 126 _POSIX_SAVED_IDS Processes have a saved set-user-ID 127 and a saved set-group-ID. 128 _POSIX_REALTIME_SIGNALS Real-time, queued signals are supported. 129 _POSIX_PRIORITY_SCHEDULING Priority scheduling is supported. 130 _POSIX_TIMERS POSIX.4 clocks and timers are supported. 131 _POSIX_ASYNCHRONOUS_IO Asynchronous I/O is supported. 132 _POSIX_PRIORITIZED_IO Prioritized asynchronous I/O is supported. 133 _POSIX_SYNCHRONIZED_IO Synchronizing file data is supported. 134 _POSIX_FSYNC The fsync function is present. 135 _POSIX_MAPPED_FILES Mapping of files to memory is supported. 136 _POSIX_MEMLOCK Locking of all memory is supported. 137 _POSIX_MEMLOCK_RANGE Locking of ranges of memory is supported. 138 _POSIX_MEMORY_PROTECTION Setting of memory protections is supported. 139 _POSIX_MESSAGE_PASSING POSIX.4 message queues are supported. 140 _POSIX_SEMAPHORES POSIX.4 counting semaphores are supported. 141 _POSIX_SHARED_MEMORY_OBJECTS POSIX.4 shared memory objects are supported. 142 _POSIX_THREADS POSIX.1c pthreads are supported. 143 _POSIX_THREAD_ATTR_STACKADDR Thread stack address attribute option supported. 144 _POSIX_THREAD_ATTR_STACKSIZE Thread stack size attribute option supported. 145 _POSIX_THREAD_SAFE_FUNCTIONS Thread-safe functions are supported. 146 _POSIX_THREAD_PRIORITY_SCHEDULING 147 POSIX.1c thread execution scheduling supported. 148 _POSIX_THREAD_PRIO_INHERIT Thread priority inheritance option supported. 149 _POSIX_THREAD_PRIO_PROTECT Thread priority protection option supported. 150 _POSIX_THREAD_PROCESS_SHARED Process-shared synchronization supported. 151 _POSIX_PII Protocol-independent interfaces are supported. 152 _POSIX_PII_XTI XTI protocol-indep. interfaces are supported. 153 _POSIX_PII_SOCKET Socket protocol-indep. interfaces are supported. 154 _POSIX_PII_INTERNET Internet family of protocols supported. 155 _POSIX_PII_INTERNET_STREAM Connection-mode Internet protocol supported. 156 _POSIX_PII_INTERNET_DGRAM Connectionless Internet protocol supported. 157 _POSIX_PII_OSI ISO/OSI family of protocols supported. 158 _POSIX_PII_OSI_COTS Connection-mode ISO/OSI service supported. 159 _POSIX_PII_OSI_CLTS Connectionless ISO/OSI service supported. 160 _POSIX_POLL Implementation supports `poll' function. 161 _POSIX_SELECT Implementation supports `select' and `pselect'. 162 163 _XOPEN_REALTIME X/Open realtime support is available. 164 _XOPEN_REALTIME_THREADS X/Open realtime thread support is available. 165 _XOPEN_SHM Shared memory interface according to XPG4.2. 166 167 _XBS5_ILP32_OFF32 Implementation provides environment with 32-bit 168 int, long, pointer, and off_t types. 169 _XBS5_ILP32_OFFBIG Implementation provides environment with 32-bit 170 int, long, and pointer and off_t with at least 171 64 bits. 172 _XBS5_LP64_OFF64 Implementation provides environment with 32-bit 173 int, and 64-bit long, pointer, and off_t types. 174 _XBS5_LPBIG_OFFBIG Implementation provides environment with at 175 least 32 bits int and long, pointer, and off_t 176 with at least 64 bits. 177 178 If any of these symbols is defined as -1, the corresponding option is not 179 true for any file. If any is defined as other than -1, the corresponding 180 option is true for all files. If a symbol is not defined at all, the value 181 for a specific file can be obtained from `pathconf' and `fpathconf'. 182 183 _POSIX_CHOWN_RESTRICTED Only the super user can use `chown' to change 184 the owner of a file. `chown' can only be used 185 to change the group ID of a file to a group of 186 which the calling process is a member. 187 _POSIX_NO_TRUNC Pathname components longer than 188 NAME_MAX generate an error. 189 _POSIX_VDISABLE If defined, if the value of an element of the 190 `c_cc' member of `struct termios' is 191 _POSIX_VDISABLE, no character will have the 192 effect associated with that element. 193 _POSIX_SYNC_IO Synchronous I/O may be performed. 194 _POSIX_ASYNC_IO Asynchronous I/O may be performed. 195 _POSIX_PRIO_IO Prioritized Asynchronous I/O may be performed. 196 197 Support for the Large File Support interface is not generally available. 198 If it is available the following constants are defined to one. 199 _LFS64_LARGEFILE Low-level I/O supports large files. 200 _LFS64_STDIO Standard I/O supports large files. 201 */ 202 203 #include <bits/posix_opt.h> 204 205 /* Get the environment definitions from Unix98. */ 206 #if defined __USE_UNIX98 || defined __USE_XOPEN2K 207 # include <bits/environments.h> 208 #endif 209 210 /* Standard file descriptors. */ 211 #define STDIN_FILENO 0 /* Standard input. */ 212 #define STDOUT_FILENO 1 /* Standard output. */ 213 #define STDERR_FILENO 2 /* Standard error output. */ 214 215 216 /* All functions that are not declared anywhere else. */ 217 218 #include <bits/types.h> 219 220 #ifndef __ssize_t_defined 221 typedef __ssize_t ssize_t; 222 # define __ssize_t_defined 223 #endif 224 225 #define __need_size_t 226 #define __need_NULL 227 #include <stddef.h> 228 229 #if defined __USE_XOPEN || defined __USE_XOPEN2K 230 /* The Single Unix specification says that some more types are 231 available here. */ 232 # ifndef __gid_t_defined 233 typedef __gid_t gid_t; 234 # define __gid_t_defined 235 # endif 236 237 # ifndef __uid_t_defined 238 typedef __uid_t uid_t; 239 # define __uid_t_defined 240 # endif 241 242 # ifndef __off_t_defined 243 # ifndef __USE_FILE_OFFSET64 244 typedef __off_t off_t; 245 # else 246 typedef __off64_t off_t; 247 # endif 248 # define __off_t_defined 249 # endif 250 # if defined __USE_LARGEFILE64 && !defined __off64_t_defined 251 typedef __off64_t off64_t; 252 # define __off64_t_defined 253 # endif 254 255 # ifndef __useconds_t_defined 256 typedef __useconds_t useconds_t; 257 # define __useconds_t_defined 258 # endif 259 260 # ifndef __pid_t_defined 261 typedef __pid_t pid_t; 262 # define __pid_t_defined 263 # endif 264 #endif /* X/Open */ 265 266 #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K 267 # ifndef __intptr_t_defined 268 typedef __intptr_t intptr_t; 269 # define __intptr_t_defined 270 # endif 271 #endif 272 273 #if defined __USE_BSD || defined __USE_XOPEN 274 # ifndef __socklen_t_defined 275 typedef __socklen_t socklen_t; 276 # define __socklen_t_defined 277 # endif 278 #endif 279 280 /* Values for the second argument to access. 281 These may be OR'd together. */ 282 #define R_OK 4 /* Test for read permission. */ 283 #define W_OK 2 /* Test for write permission. */ 284 #define X_OK 1 /* Test for execute permission. */ 285 #define F_OK 0 /* Test for existence. */ 286 287 /* Test for access to NAME using the real UID and real GID. */ 288 extern int access (__const char *__name, int __type) __THROW __nonnull ((1)); 289 290 #ifdef __USE_GNU 291 /* Test for access to NAME using the effective UID and GID 292 (as normal file operations use). */ 293 extern int euidaccess (__const char *__name, int __type) 294 __THROW __nonnull ((1)); 295 296 /* An alias for `euidaccess', used by some other systems. */ 297 extern int eaccess (__const char *__name, int __type) 298 __THROW __nonnull ((1)); 299 #endif 300 301 #ifdef __USE_ATFILE 302 /* Test for access to FILE relative to the directory FD is open on. 303 If AT_EACCESS is set in FLAG, then use effective IDs like `eaccess', 304 otherwise use real IDs like `access'. */ 305 extern int faccessat (int __fd, __const char *__file, int __type, int __flag) 306 __THROW __nonnull ((2)) __wur; 307 #endif /* Use GNU. */ 308 309 310 /* Values for the WHENCE argument to lseek. */ 311 #ifndef _STDIO_H /* <stdio.h> has the same definitions. */ 312 # define SEEK_SET 0 /* Seek from beginning of file. */ 313 # define SEEK_CUR 1 /* Seek from current position. */ 314 # define SEEK_END 2 /* Seek from end of file. */ 315 # ifdef __USE_GNU 316 # define SEEK_DATA 3 /* Seek to next data. */ 317 # define SEEK_HOLE 4 /* Seek to next hole. */ 318 # endif 319 #endif 320 321 #if defined __USE_BSD && !defined L_SET 322 /* Old BSD names for the same constants; just for compatibility. */ 323 # define L_SET SEEK_SET 324 # define L_INCR SEEK_CUR 325 # define L_XTND SEEK_END 326 #endif 327 328 329 /* Move FD's file position to OFFSET bytes from the 330 beginning of the file (if WHENCE is SEEK_SET), 331 the current position (if WHENCE is SEEK_CUR), 332 or the end of the file (if WHENCE is SEEK_END). 333 Return the new file position. */ 334 #ifndef __USE_FILE_OFFSET64 335 extern __off_t lseek (int __fd, __off_t __offset, int __whence) __THROW; 336 #else 337 # ifdef __REDIRECT_NTH 338 extern __off64_t __REDIRECT_NTH (lseek, 339 (int __fd, __off64_t __offset, int __whence), 340 lseek64); 341 # else 342 # define lseek lseek64 343 # endif 344 #endif 345 #ifdef __USE_LARGEFILE64 346 extern __off64_t lseek64 (int __fd, __off64_t __offset, int __whence) 347 __THROW; 348 #endif 349 350 /* Close the file descriptor FD. 351 352 This function is a cancellation point and therefore not marked with 353 __THROW. */ 354 extern int close (int __fd); 355 356 /* Read NBYTES into BUF from FD. Return the 357 number read, -1 for errors or 0 for EOF. 358 359 This function is a cancellation point and therefore not marked with 360 __THROW. */ 361 extern ssize_t read (int __fd, void *__buf, size_t __nbytes) __wur; 362 363 /* Write N bytes of BUF to FD. Return the number written, or -1. 364 365 This function is a cancellation point and therefore not marked with 366 __THROW. */ 367 extern ssize_t write (int __fd, __const void *__buf, size_t __n) __wur; 368 369 #if defined __USE_UNIX98 || defined __USE_XOPEN2K8 370 # ifndef __USE_FILE_OFFSET64 371 /* Read NBYTES into BUF from FD at the given position OFFSET without 372 changing the file pointer. Return the number read, -1 for errors 373 or 0 for EOF. 374 375 This function is a cancellation point and therefore not marked with 376 __THROW. */ 377 extern ssize_t pread (int __fd, void *__buf, size_t __nbytes, 378 __off_t __offset) __wur; 379 380 /* Write N bytes of BUF to FD at the given position OFFSET without 381 changing the file pointer. Return the number written, or -1. 382 383 This function is a cancellation point and therefore not marked with 384 __THROW. */ 385 extern ssize_t pwrite (int __fd, __const void *__buf, size_t __n, 386 __off_t __offset) __wur; 387 # else 388 # ifdef __REDIRECT 389 extern ssize_t __REDIRECT (pread, (int __fd, void *__buf, size_t __nbytes, 390 __off64_t __offset), 391 pread64) __wur; 392 extern ssize_t __REDIRECT (pwrite, (int __fd, __const void *__buf, 393 size_t __nbytes, __off64_t __offset), 394 pwrite64) __wur; 395 # else 396 # define pread pread64 397 # define pwrite pwrite64 398 # endif 399 # endif 400 401 # ifdef __USE_LARGEFILE64 402 /* Read NBYTES into BUF from FD at the given position OFFSET without 403 changing the file pointer. Return the number read, -1 for errors 404 or 0 for EOF. */ 405 extern ssize_t pread64 (int __fd, void *__buf, size_t __nbytes, 406 __off64_t __offset) __wur; 407 /* Write N bytes of BUF to FD at the given position OFFSET without 408 changing the file pointer. Return the number written, or -1. */ 409 extern ssize_t pwrite64 (int __fd, __const void *__buf, size_t __n, 410 __off64_t __offset) __wur; 411 # endif 412 #endif 413 414 /* Create a one-way communication channel (pipe). 415 If successful, two file descriptors are stored in PIPEDES; 416 bytes written on PIPEDES[1] can be read from PIPEDES[0]. 417 Returns 0 if successful, -1 if not. */ 418 extern int pipe (int __pipedes[2]) __THROW __wur; 419 420 #ifdef __USE_GNU 421 /* Same as pipe but apply flags passed in FLAGS to the new file 422 descriptors. */ 423 extern int pipe2 (int __pipedes[2], int __flags) __THROW __wur; 424 #endif 425 426 /* Schedule an alarm. In SECONDS seconds, the process will get a SIGALRM. 427 If SECONDS is zero, any currently scheduled alarm will be cancelled. 428 The function returns the number of seconds remaining until the last 429 alarm scheduled would have signaled, or zero if there wasn't one. 430 There is no return value to indicate an error, but you can set `errno' 431 to 0 and check its value after calling `alarm', and this might tell you. 432 The signal may come late due to processor scheduling. */ 433 extern unsigned int alarm (unsigned int __seconds) __THROW; 434 435 /* Make the process sleep for SECONDS seconds, or until a signal arrives 436 and is not ignored. The function returns the number of seconds less 437 than SECONDS which it actually slept (thus zero if it slept the full time). 438 If a signal handler does a `longjmp' or modifies the handling of the 439 SIGALRM signal while inside `sleep' call, the handling of the SIGALRM 440 signal afterwards is undefined. There is no return value to indicate 441 error, but if `sleep' returns SECONDS, it probably didn't work. 442 443 This function is a cancellation point and therefore not marked with 444 __THROW. */ 445 extern unsigned int sleep (unsigned int __seconds); 446 447 #if (defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K8) \ 448 || defined __USE_BSD 449 /* Set an alarm to go off (generating a SIGALRM signal) in VALUE 450 microseconds. If INTERVAL is nonzero, when the alarm goes off, the 451 timer is reset to go off every INTERVAL microseconds thereafter. 452 Returns the number of microseconds remaining before the alarm. */ 453 extern __useconds_t ualarm (__useconds_t __value, __useconds_t __interval) 454 __THROW; 455 456 /* Sleep USECONDS microseconds, or until a signal arrives that is not blocked 457 or ignored. 458 459 This function is a cancellation point and therefore not marked with 460 __THROW. */ 461 extern int usleep (__useconds_t __useconds); 462 #endif 463 464 465 /* Suspend the process until a signal arrives. 466 This always returns -1 and sets `errno' to EINTR. 467 468 This function is a cancellation point and therefore not marked with 469 __THROW. */ 470 extern int pause (void); 471 472 473 /* Change the owner and group of FILE. */ 474 extern int chown (__const char *__file, __uid_t __owner, __gid_t __group) 475 __THROW __nonnull ((1)) __wur; 476 477 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8 478 /* Change the owner and group of the file that FD is open on. */ 479 extern int fchown (int __fd, __uid_t __owner, __gid_t __group) __THROW __wur; 480 481 482 /* Change owner and group of FILE, if it is a symbolic 483 link the ownership of the symbolic link is changed. */ 484 extern int lchown (__const char *__file, __uid_t __owner, __gid_t __group) 485 __THROW __nonnull ((1)) __wur; 486 487 #endif /* Use BSD || X/Open Unix. */ 488 489 #ifdef __USE_ATFILE 490 /* Change the owner and group of FILE relative to the directory FD is open 491 on. */ 492 extern int fchownat (int __fd, __const char *__file, __uid_t __owner, 493 __gid_t __group, int __flag) 494 __THROW __nonnull ((2)) __wur; 495 #endif /* Use GNU. */ 496 497 /* Change the process's working directory to PATH. */ 498 extern int chdir (__const char *__path) __THROW __nonnull ((1)) __wur; 499 500 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8 501 /* Change the process's working directory to the one FD is open on. */ 502 extern int fchdir (int __fd) __THROW __wur; 503 #endif 504 505 /* Get the pathname of the current working directory, 506 and put it in SIZE bytes of BUF. Returns NULL if the 507 directory couldn't be determined or SIZE was too small. 508 If successful, returns BUF. In GNU, if BUF is NULL, 509 an array is allocated with `malloc'; the array is SIZE 510 bytes long, unless SIZE == 0, in which case it is as 511 big as necessary. */ 512 extern char *getcwd (char *__buf, size_t __size) __THROW __wur; 513 514 #ifdef __USE_GNU 515 /* Return a malloc'd string containing the current directory name. 516 If the environment variable `PWD' is set, and its value is correct, 517 that value is used. */ 518 extern char *get_current_dir_name (void) __THROW; 519 #endif 520 521 #if (defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K8) \ 522 || defined __USE_BSD 523 /* Put the absolute pathname of the current working directory in BUF. 524 If successful, return BUF. If not, put an error message in 525 BUF and return NULL. BUF should be at least PATH_MAX bytes long. */ 526 extern char *getwd (char *__buf) 527 __THROW __nonnull ((1)) __attribute_deprecated__ __wur; 528 #endif 529 530 531 /* Duplicate FD, returning a new file descriptor on the same file. */ 532 extern int dup (int __fd) __THROW __wur; 533 534 /* Duplicate FD to FD2, closing FD2 and making it open on the same file. */ 535 extern int dup2 (int __fd, int __fd2) __THROW; 536 537 #ifdef __USE_GNU 538 /* Duplicate FD to FD2, closing FD2 and making it open on the same 539 file while setting flags according to FLAGS. */ 540 extern int dup3 (int __fd, int __fd2, int __flags) __THROW; 541 #endif 542 543 /* NULL-terminated array of "NAME=VALUE" environment variables. */ 544 extern char **__environ; 545 #ifdef __USE_GNU 546 extern char **environ; 547 #endif 548 549 550 /* Replace the current process, executing PATH with arguments ARGV and 551 environment ENVP. ARGV and ENVP are terminated by NULL pointers. */ 552 extern int execve (__const char *__path, char *__const __argv[], 553 char *__const __envp[]) __THROW __nonnull ((1, 2)); 554 555 #ifdef __USE_XOPEN2K8 556 /* Execute the file FD refers to, overlaying the running program image. 557 ARGV and ENVP are passed to the new program, as for `execve'. */ 558 extern int fexecve (int __fd, char *__const __argv[], char *__const __envp[]) 559 __THROW __nonnull ((2)); 560 #endif 561 562 563 /* Execute PATH with arguments ARGV and environment from `environ'. */ 564 extern int execv (__const char *__path, char *__const __argv[]) 565 __THROW __nonnull ((1, 2)); 566 567 /* Execute PATH with all arguments after PATH until a NULL pointer, 568 and the argument after that for environment. */ 569 extern int execle (__const char *__path, __const char *__arg, ...) 570 __THROW __nonnull ((1, 2)); 571 572 /* Execute PATH with all arguments after PATH until 573 a NULL pointer and environment from `environ'. */ 574 extern int execl (__const char *__path, __const char *__arg, ...) 575 __THROW __nonnull ((1, 2)); 576 577 /* Execute FILE, searching in the `PATH' environment variable if it contains 578 no slashes, with arguments ARGV and environment from `environ'. */ 579 extern int execvp (__const char *__file, char *__const __argv[]) 580 __THROW __nonnull ((1, 2)); 581 582 /* Execute FILE, searching in the `PATH' environment variable if 583 it contains no slashes, with all arguments after FILE until a 584 NULL pointer and environment from `environ'. */ 585 extern int execlp (__const char *__file, __const char *__arg, ...) 586 __THROW __nonnull ((1, 2)); 587 588 #ifdef __USE_GNU 589 /* Execute FILE, searching in the `PATH' environment variable if it contains 590 no slashes, with arguments ARGV and environment from `environ'. */ 591 extern int execvpe (__const char *__file, char *__const __argv[], 592 char *__const __envp[]) 593 __THROW __nonnull ((1, 2)); 594 #endif 595 596 597 #if defined __USE_MISC || defined __USE_XOPEN 598 /* Add INC to priority of the current process. */ 599 extern int nice (int __inc) __THROW __wur; 600 #endif 601 602 603 /* Terminate program execution with the low-order 8 bits of STATUS. */ 604 extern void _exit (int __status) __attribute__ ((__noreturn__)); 605 606 607 /* Get the `_PC_*' symbols for the NAME argument to `pathconf' and `fpathconf'; 608 the `_SC_*' symbols for the NAME argument to `sysconf'; 609 and the `_CS_*' symbols for the NAME argument to `confstr'. */ 610 #include <bits/confname.h> 611 612 /* Get file-specific configuration information about PATH. */ 613 extern long int pathconf (__const char *__path, int __name) 614 __THROW __nonnull ((1)); 615 616 /* Get file-specific configuration about descriptor FD. */ 617 extern long int fpathconf (int __fd, int __name) __THROW; 618 619 /* Get the value of the system variable NAME. */ 620 extern long int sysconf (int __name) __THROW; 621 622 #ifdef __USE_POSIX2 623 /* Get the value of the string-valued system variable NAME. */ 624 extern size_t confstr (int __name, char *__buf, size_t __len) __THROW; 625 #endif 626 627 628 /* Get the process ID of the calling process. */ 629 extern __pid_t getpid (void) __THROW; 630 631 /* Get the process ID of the calling process's parent. */ 632 extern __pid_t getppid (void) __THROW; 633 634 /* Get the process group ID of the calling process. 635 This function is different on old BSD. */ 636 #ifndef __FAVOR_BSD 637 extern __pid_t getpgrp (void) __THROW; 638 #else 639 # ifdef __REDIRECT_NTH 640 extern __pid_t __REDIRECT_NTH (getpgrp, (__pid_t __pid), __getpgid); 641 # else 642 # define getpgrp __getpgid 643 # endif 644 #endif 645 646 /* Get the process group ID of process PID. */ 647 extern __pid_t __getpgid (__pid_t __pid) __THROW; 648 #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8 649 extern __pid_t getpgid (__pid_t __pid) __THROW; 650 #endif 651 652 653 /* Set the process group ID of the process matching PID to PGID. 654 If PID is zero, the current process's process group ID is set. 655 If PGID is zero, the process ID of the process is used. */ 656 extern int setpgid (__pid_t __pid, __pid_t __pgid) __THROW; 657 658 #if defined __USE_SVID || defined __USE_BSD || defined __USE_XOPEN_EXTENDED 659 /* Both System V and BSD have `setpgrp' functions, but with different 660 calling conventions. The BSD function is the same as POSIX.1 `setpgid' 661 (above). The System V function takes no arguments and puts the calling 662 process in its on group like `setpgid (0, 0)'. 663 664 New programs should always use `setpgid' instead. 665 666 The default in GNU is to provide the System V function. The BSD 667 function is available under -D_BSD_SOURCE. */ 668 669 # ifndef __FAVOR_BSD 670 671 /* Set the process group ID of the calling process to its own PID. 672 This is exactly the same as `setpgid (0, 0)'. */ 673 extern int setpgrp (void) __THROW; 674 675 # else 676 677 /* Another name for `setpgid' (above). */ 678 # ifdef __REDIRECT_NTH 679 extern int __REDIRECT_NTH (setpgrp, (__pid_t __pid, __pid_t __pgrp), setpgid); 680 # else 681 # define setpgrp setpgid 682 # endif 683 684 # endif /* Favor BSD. */ 685 #endif /* Use SVID or BSD. */ 686 687 /* Create a new session with the calling process as its leader. 688 The process group IDs of the session and the calling process 689 are set to the process ID of the calling process, which is returned. */ 690 extern __pid_t setsid (void) __THROW; 691 692 #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8 693 /* Return the session ID of the given process. */ 694 extern __pid_t getsid (__pid_t __pid) __THROW; 695 #endif 696 697 /* Get the real user ID of the calling process. */ 698 extern __uid_t getuid (void) __THROW; 699 700 /* Get the effective user ID of the calling process. */ 701 extern __uid_t geteuid (void) __THROW; 702 703 /* Get the real group ID of the calling process. */ 704 extern __gid_t getgid (void) __THROW; 705 706 /* Get the effective group ID of the calling process. */ 707 extern __gid_t getegid (void) __THROW; 708 709 /* If SIZE is zero, return the number of supplementary groups 710 the calling process is in. Otherwise, fill in the group IDs 711 of its supplementary groups in LIST and return the number written. */ 712 extern int getgroups (int __size, __gid_t __list[]) __THROW __wur; 713 714 #ifdef __USE_GNU 715 /* Return nonzero iff the calling process is in group GID. */ 716 extern int group_member (__gid_t __gid) __THROW; 717 #endif 718 719 /* Set the user ID of the calling process to UID. 720 If the calling process is the super-user, set the real 721 and effective user IDs, and the saved set-user-ID to UID; 722 if not, the effective user ID is set to UID. */ 723 extern int setuid (__uid_t __uid) __THROW; 724 725 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED 726 /* Set the real user ID of the calling process to RUID, 727 and the effective user ID of the calling process to EUID. */ 728 extern int setreuid (__uid_t __ruid, __uid_t __euid) __THROW; 729 #endif 730 731 #if defined __USE_BSD || defined __USE_XOPEN2K 732 /* Set the effective user ID of the calling process to UID. */ 733 extern int seteuid (__uid_t __uid) __THROW; 734 #endif /* Use BSD. */ 735 736 /* Set the group ID of the calling process to GID. 737 If the calling process is the super-user, set the real 738 and effective group IDs, and the saved set-group-ID to GID; 739 if not, the effective group ID is set to GID. */ 740 extern int setgid (__gid_t __gid) __THROW; 741 742 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED 743 /* Set the real group ID of the calling process to RGID, 744 and the effective group ID of the calling process to EGID. */ 745 extern int setregid (__gid_t __rgid, __gid_t __egid) __THROW; 746 #endif 747 748 #if defined __USE_BSD || defined __USE_XOPEN2K 749 /* Set the effective group ID of the calling process to GID. */ 750 extern int setegid (__gid_t __gid) __THROW; 751 #endif /* Use BSD. */ 752 753 #ifdef __USE_GNU 754 /* Fetch the real user ID, effective user ID, and saved-set user ID, 755 of the calling process. */ 756 extern int getresuid (__uid_t *__ruid, __uid_t *__euid, __uid_t *__suid) 757 __THROW; 758 759 /* Fetch the real group ID, effective group ID, and saved-set group ID, 760 of the calling process. */ 761 extern int getresgid (__gid_t *__rgid, __gid_t *__egid, __gid_t *__sgid) 762 __THROW; 763 764 /* Set the real user ID, effective user ID, and saved-set user ID, 765 of the calling process to RUID, EUID, and SUID, respectively. */ 766 extern int setresuid (__uid_t __ruid, __uid_t __euid, __uid_t __suid) 767 __THROW; 768 769 /* Set the real group ID, effective group ID, and saved-set group ID, 770 of the calling process to RGID, EGID, and SGID, respectively. */ 771 extern int setresgid (__gid_t __rgid, __gid_t __egid, __gid_t __sgid) 772 __THROW; 773 #endif 774 775 776 /* Clone the calling process, creating an exact copy. 777 Return -1 for errors, 0 to the new process, 778 and the process ID of the new process to the old process. */ 779 extern __pid_t fork (void) __THROWNL; 780 781 #if (defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K8) \ 782 || defined __USE_BSD 783 /* Clone the calling process, but without copying the whole address space. 784 The calling process is suspended until the new process exits or is 785 replaced by a call to `execve'. Return -1 for errors, 0 to the new process, 786 and the process ID of the new process to the old process. */ 787 extern __pid_t vfork (void) __THROW; 788 #endif /* Use BSD or XPG < 7. */ 789 790 791 /* Return the pathname of the terminal FD is open on, or NULL on errors. 792 The returned storage is good only until the next call to this function. */ 793 extern char *ttyname (int __fd) __THROW; 794 795 /* Store at most BUFLEN characters of the pathname of the terminal FD is 796 open on in BUF. Return 0 on success, otherwise an error number. */ 797 extern int ttyname_r (int __fd, char *__buf, size_t __buflen) 798 __THROW __nonnull ((2)) __wur; 799 800 /* Return 1 if FD is a valid descriptor associated 801 with a terminal, zero if not. */ 802 extern int isatty (int __fd) __THROW; 803 804 #if defined __USE_BSD \ 805 || (defined __USE_XOPEN_EXTENDED && !defined __USE_UNIX98) 806 /* Return the index into the active-logins file (utmp) for 807 the controlling terminal. */ 808 extern int ttyslot (void) __THROW; 809 #endif 810 811 812 /* Make a link to FROM named TO. */ 813 extern int link (__const char *__from, __const char *__to) 814 __THROW __nonnull ((1, 2)) __wur; 815 816 #ifdef __USE_ATFILE 817 /* Like link but relative paths in TO and FROM are interpreted relative 818 to FROMFD and TOFD respectively. */ 819 extern int linkat (int __fromfd, __const char *__from, int __tofd, 820 __const char *__to, int __flags) 821 __THROW __nonnull ((2, 4)) __wur; 822 #endif 823 824 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K 825 /* Make a symbolic link to FROM named TO. */ 826 extern int symlink (__const char *__from, __const char *__to) 827 __THROW __nonnull ((1, 2)) __wur; 828 829 /* Read the contents of the symbolic link PATH into no more than 830 LEN bytes of BUF. The contents are not null-terminated. 831 Returns the number of characters read, or -1 for errors. */ 832 extern ssize_t readlink (__const char *__restrict __path, 833 char *__restrict __buf, size_t __len) 834 __THROW __nonnull ((1, 2)) __wur; 835 #endif /* Use BSD. */ 836 837 #ifdef __USE_ATFILE 838 /* Like symlink but a relative path in TO is interpreted relative to TOFD. */ 839 extern int symlinkat (__const char *__from, int __tofd, 840 __const char *__to) __THROW __nonnull ((1, 3)) __wur; 841 842 /* Like readlink but a relative PATH is interpreted relative to FD. */ 843 extern ssize_t readlinkat (int __fd, __const char *__restrict __path, 844 char *__restrict __buf, size_t __len) 845 __THROW __nonnull ((2, 3)) __wur; 846 #endif 847 848 /* Remove the link NAME. */ 849 extern int unlink (__const char *__name) __THROW __nonnull ((1)); 850 851 #ifdef __USE_ATFILE 852 /* Remove the link NAME relative to FD. */ 853 extern int unlinkat (int __fd, __const char *__name, int __flag) 854 __THROW __nonnull ((2)); 855 #endif 856 857 /* Remove the directory PATH. */ 858 extern int rmdir (__const char *__path) __THROW __nonnull ((1)); 859 860 861 /* Return the foreground process group ID of FD. */ 862 extern __pid_t tcgetpgrp (int __fd) __THROW; 863 864 /* Set the foreground process group ID of FD set PGRP_ID. */ 865 extern int tcsetpgrp (int __fd, __pid_t __pgrp_id) __THROW; 866 867 868 /* Return the login name of the user. 869 870 This function is a possible cancellation point and therefore not 871 marked with __THROW. */ 872 extern char *getlogin (void); 873 #if defined __USE_REENTRANT || defined __USE_POSIX199506 874 /* Return at most NAME_LEN characters of the login name of the user in NAME. 875 If it cannot be determined or some other error occurred, return the error 876 code. Otherwise return 0. 877 878 This function is a possible cancellation point and therefore not 879 marked with __THROW. */ 880 extern int getlogin_r (char *__name, size_t __name_len) __nonnull ((1)); 881 #endif 882 883 #ifdef __USE_BSD 884 /* Set the login name returned by `getlogin'. */ 885 extern int setlogin (__const char *__name) __THROW __nonnull ((1)); 886 #endif 887 888 889 #ifdef __USE_POSIX2 890 /* Get definitions and prototypes for functions to process the 891 arguments in ARGV (ARGC of them, minus the program name) for 892 options given in OPTS. */ 893 # define __need_getopt 894 # include <getopt.h> 895 #endif 896 897 898 #if defined __USE_BSD || defined __USE_UNIX98 || defined __USE_XOPEN2K 899 /* Put the name of the current host in no more than LEN bytes of NAME. 900 The result is null-terminated if LEN is large enough for the full 901 name and the terminator. */ 902 extern int gethostname (char *__name, size_t __len) __THROW __nonnull ((1)); 903 #endif 904 905 906 #if defined __USE_BSD || (defined __USE_XOPEN && !defined __USE_UNIX98) 907 /* Set the name of the current host to NAME, which is LEN bytes long. 908 This call is restricted to the super-user. */ 909 extern int sethostname (__const char *__name, size_t __len) 910 __THROW __nonnull ((1)) __wur; 911 912 /* Set the current machine's Internet number to ID. 913 This call is restricted to the super-user. */ 914 extern int sethostid (long int __id) __THROW __wur; 915 916 917 /* Get and set the NIS (aka YP) domain name, if any. 918 Called just like `gethostname' and `sethostname'. 919 The NIS domain name is usually the empty string when not using NIS. */ 920 extern int getdomainname (char *__name, size_t __len) 921 __THROW __nonnull ((1)) __wur; 922 extern int setdomainname (__const char *__name, size_t __len) 923 __THROW __nonnull ((1)) __wur; 924 925 926 /* Revoke access permissions to all processes currently communicating 927 with the control terminal, and then send a SIGHUP signal to the process 928 group of the control terminal. */ 929 extern int vhangup (void) __THROW; 930 931 /* Revoke the access of all descriptors currently open on FILE. */ 932 extern int revoke (__const char *__file) __THROW __nonnull ((1)) __wur; 933 934 935 /* Enable statistical profiling, writing samples of the PC into at most 936 SIZE bytes of SAMPLE_BUFFER; every processor clock tick while profiling 937 is enabled, the system examines the user PC and increments 938 SAMPLE_BUFFER[((PC - OFFSET) / 2) * SCALE / 65536]. If SCALE is zero, 939 disable profiling. Returns zero on success, -1 on error. */ 940 extern int profil (unsigned short int *__sample_buffer, size_t __size, 941 size_t __offset, unsigned int __scale) 942 __THROW __nonnull ((1)); 943 944 945 /* Turn accounting on if NAME is an existing file. The system will then write 946 a record for each process as it terminates, to this file. If NAME is NULL, 947 turn accounting off. This call is restricted to the super-user. */ 948 extern int acct (__const char *__name) __THROW; 949 950 951 /* Successive calls return the shells listed in `/etc/shells'. */ 952 extern char *getusershell (void) __THROW; 953 extern void endusershell (void) __THROW; /* Discard cached info. */ 954 extern void setusershell (void) __THROW; /* Rewind and re-read the file. */ 955 956 957 /* Put the program in the background, and dissociate from the controlling 958 terminal. If NOCHDIR is zero, do `chdir ("/")'. If NOCLOSE is zero, 959 redirects stdin, stdout, and stderr to /dev/null. */ 960 extern int daemon (int __nochdir, int __noclose) __THROW __wur; 961 #endif /* Use BSD || X/Open. */ 962 963 964 #if defined __USE_BSD || (defined __USE_XOPEN && !defined __USE_XOPEN2K) 965 /* Make PATH be the root directory (the starting point for absolute paths). 966 This call is restricted to the super-user. */ 967 extern int chroot (__const char *__path) __THROW __nonnull ((1)) __wur; 968 969 /* Prompt with PROMPT and read a string from the terminal without echoing. 970 Uses /dev/tty if possible; otherwise stderr and stdin. */ 971 extern char *getpass (__const char *__prompt) __nonnull ((1)); 972 #endif /* Use BSD || X/Open. */ 973 974 975 #if defined __USE_BSD || defined __USE_XOPEN || defined __USE_XOPEN2K 976 /* Make all changes done to FD actually appear on disk. 977 978 This function is a cancellation point and therefore not marked with 979 __THROW. */ 980 extern int fsync (int __fd); 981 #endif /* Use BSD || X/Open || Unix98. */ 982 983 984 #ifdef __USE_GNU 985 /* Make all changes done to all files on the file system associated 986 with FD actually appear on disk. */ 987 extern int syncfs (int __fd) __THROW; 988 #endif 989 990 991 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED 992 993 /* Return identifier for the current host. */ 994 extern long int gethostid (void); 995 996 /* Make all changes done to all files actually appear on disk. */ 997 extern void sync (void) __THROW; 998 999 1000 # if defined __USE_BSD || !defined __USE_XOPEN2K 1001 /* Return the number of bytes in a page. This is the system's page size, 1002 which is not necessarily the same as the hardware page size. */ 1003 extern int getpagesize (void) __THROW __attribute__ ((__const__)); 1004 1005 1006 /* Return the maximum number of file descriptors 1007 the current process could possibly have. */ 1008 extern int getdtablesize (void) __THROW; 1009 # endif 1010 1011 #endif /* Use BSD || X/Open Unix. */ 1012 1013 1014 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8 1015 1016 /* Truncate FILE to LENGTH bytes. */ 1017 # ifndef __USE_FILE_OFFSET64 1018 extern int truncate (__const char *__file, __off_t __length) 1019 __THROW __nonnull ((1)) __wur; 1020 # else 1021 # ifdef __REDIRECT_NTH 1022 extern int __REDIRECT_NTH (truncate, 1023 (__const char *__file, __off64_t __length), 1024 truncate64) __nonnull ((1)) __wur; 1025 # else 1026 # define truncate truncate64 1027 # endif 1028 # endif 1029 # ifdef __USE_LARGEFILE64 1030 extern int truncate64 (__const char *__file, __off64_t __length) 1031 __THROW __nonnull ((1)) __wur; 1032 # endif 1033 1034 #endif /* Use BSD || X/Open Unix || POSIX 2008. */ 1035 1036 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K 1037 1038 /* Truncate the file FD is open on to LENGTH bytes. */ 1039 # ifndef __USE_FILE_OFFSET64 1040 extern int ftruncate (int __fd, __off_t __length) __THROW __wur; 1041 # else 1042 # ifdef __REDIRECT_NTH 1043 extern int __REDIRECT_NTH (ftruncate, (int __fd, __off64_t __length), 1044 ftruncate64) __wur; 1045 # else 1046 # define ftruncate ftruncate64 1047 # endif 1048 # endif 1049 # ifdef __USE_LARGEFILE64 1050 extern int ftruncate64 (int __fd, __off64_t __length) __THROW __wur; 1051 # endif 1052 1053 #endif /* Use BSD || X/Open Unix || POSIX 2003. */ 1054 1055 1056 #if (defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K) \ 1057 || defined __USE_MISC 1058 1059 /* Set the end of accessible data space (aka "the break") to ADDR. 1060 Returns zero on success and -1 for errors (with errno set). */ 1061 extern int brk (void *__addr) __THROW __wur; 1062 1063 /* Increase or decrease the end of accessible data space by DELTA bytes. 1064 If successful, returns the address the previous end of data space 1065 (i.e. the beginning of the new space, if DELTA > 0); 1066 returns (void *) -1 for errors (with errno set). */ 1067 extern void *sbrk (intptr_t __delta) __THROW; 1068 #endif 1069 1070 1071 #ifdef __USE_MISC 1072 /* Invoke `system call' number SYSNO, passing it the remaining arguments. 1073 This is completely system-dependent, and not often useful. 1074 1075 In Unix, `syscall' sets `errno' for all errors and most calls return -1 1076 for errors; in many systems you cannot pass arguments or get return 1077 values for all system calls (`pipe', `fork', and `getppid' typically 1078 among them). 1079 1080 In Mach, all system calls take normal arguments and always return an 1081 error code (zero for success). */ 1082 extern long int syscall (long int __sysno, ...) __THROW; 1083 1084 #endif /* Use misc. */ 1085 1086 1087 #if (defined __USE_MISC || defined __USE_XOPEN_EXTENDED) && !defined F_LOCK 1088 /* NOTE: These declarations also appear in <fcntl.h>; be sure to keep both 1089 files consistent. Some systems have them there and some here, and some 1090 software depends on the macros being defined without including both. */ 1091 1092 /* `lockf' is a simpler interface to the locking facilities of `fcntl'. 1093 LEN is always relative to the current file position. 1094 The CMD argument is one of the following. 1095 1096 This function is a cancellation point and therefore not marked with 1097 __THROW. */ 1098 1099 # define F_ULOCK 0 /* Unlock a previously locked region. */ 1100 # define F_LOCK 1 /* Lock a region for exclusive use. */ 1101 # define F_TLOCK 2 /* Test and lock a region for exclusive use. */ 1102 # define F_TEST 3 /* Test a region for other processes locks. */ 1103 1104 # ifndef __USE_FILE_OFFSET64 1105 extern int lockf (int __fd, int __cmd, __off_t __len) __wur; 1106 # else 1107 # ifdef __REDIRECT 1108 extern int __REDIRECT (lockf, (int __fd, int __cmd, __off64_t __len), 1109 lockf64) __wur; 1110 # else 1111 # define lockf lockf64 1112 # endif 1113 # endif 1114 # ifdef __USE_LARGEFILE64 1115 extern int lockf64 (int __fd, int __cmd, __off64_t __len) __wur; 1116 # endif 1117 #endif /* Use misc and F_LOCK not already defined. */ 1118 1119 1120 #ifdef __USE_GNU 1121 1122 /* Evaluate EXPRESSION, and repeat as long as it returns -1 with `errno' 1123 set to EINTR. */ 1124 1125 # define TEMP_FAILURE_RETRY(expression) \ 1126 (__extension__ \ 1127 ({ long int __result; \ 1128 do __result = (long int) (expression); \ 1129 while (__result == -1L && errno == EINTR); \ 1130 __result; })) 1131 #endif 1132 1133 #if defined __USE_POSIX199309 || defined __USE_UNIX98 1134 /* Synchronize at least the data part of a file with the underlying 1135 media. */ 1136 extern int fdatasync (int __fildes); 1137 #endif /* Use POSIX199309 */ 1138 1139 1140 /* XPG4.2 specifies that prototypes for the encryption functions must 1141 be defined here. */ 1142 #ifdef __USE_XOPEN 1143 /* Encrypt at most 8 characters from KEY using salt to perturb DES. */ 1144 extern char *crypt (__const char *__key, __const char *__salt) 1145 __THROW __nonnull ((1, 2)); 1146 1147 /* Encrypt data in BLOCK in place if EDFLAG is zero; otherwise decrypt 1148 block in place. */ 1149 extern void encrypt (char *__libc_block, int __edflag) __THROW __nonnull ((1)); 1150 1151 1152 /* Swab pairs bytes in the first N bytes of the area pointed to by 1153 FROM and copy the result to TO. The value of TO must not be in the 1154 range [FROM - N + 1, FROM - 1]. If N is odd the first byte in FROM 1155 is without partner. */ 1156 extern void swab (__const void *__restrict __from, void *__restrict __to, 1157 ssize_t __n) __THROW __nonnull ((1, 2)); 1158 #endif 1159 1160 1161 /* The Single Unix specification demands this prototype to be here. 1162 It is also found in <stdio.h>. */ 1163 #if defined __USE_XOPEN || defined __USE_XOPEN2K8 1164 /* Return the name of the controlling terminal. */ 1165 extern char *ctermid (char *__s) __THROW; 1166 #endif 1167 1168 1169 /* Define some macros helping to catch buffer overflows. */ 1170 #if __USE_FORTIFY_LEVEL > 0 && defined __extern_always_inline 1171 # include <bits/unistd.h> 1172 #endif 1173 1174 __END_DECLS 1175 1176 #endif /* unistd.h */ 1177
