unistd.h 39 KB

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  1. /* Copyright (C) 1991-2002,2003,2004,2005,2006 Free Software Foundation, Inc.
  2. This file is part of the GNU C Library.
  3. The GNU C Library is free software; you can redistribute it and/or
  4. modify it under the terms of the GNU Lesser General Public
  5. License as published by the Free Software Foundation; either
  6. version 2.1 of the License, or (at your option) any later version.
  7. The GNU C Library is distributed in the hope that it will be useful,
  8. but WITHOUT ANY WARRANTY; without even the implied warranty of
  9. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  10. Lesser General Public License for more details.
  11. You should have received a copy of the GNU Lesser General Public
  12. License along with the GNU C Library; if not, write to the Free
  13. Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  14. 02111-1307 USA. */
  15. /*
  16. * POSIX Standard: 2.10 Symbolic Constants <unistd.h>
  17. */
  18. #ifndef _UNISTD_H
  19. #define _UNISTD_H 1
  20. #include <features.h>
  21. __BEGIN_DECLS
  22. /* These may be used to determine what facilities are present at compile time.
  23. Their values can be obtained at run time from `sysconf'. */
  24. /* POSIX Standard approved as ISO/IEC 9945-1 as of December 2001. */
  25. #define _POSIX_VERSION 200112L
  26. /* These are not #ifdef __USE_POSIX2 because they are
  27. in the theoretically application-owned namespace. */
  28. /* The utilities on GNU systems also correspond to this version. */
  29. #define _POSIX2_VERSION 200112L
  30. /* If defined, the implementation supports the
  31. C Language Bindings Option. */
  32. #define _POSIX2_C_BIND 200112L
  33. /* If defined, the implementation supports the
  34. C Language Development Utilities Option. */
  35. #define _POSIX2_C_DEV 200112L
  36. /* If defined, the implementation supports the
  37. Software Development Utilities Option. */
  38. #define _POSIX2_SW_DEV 200112L
  39. /* If defined, the implementation supports the
  40. creation of locales with the localedef utility. */
  41. #define _POSIX2_LOCALEDEF 200112L
  42. /* X/Open version number to which the library conforms. It is selectable. */
  43. #ifdef __USE_UNIX98
  44. # define _XOPEN_VERSION 500
  45. #else
  46. # define _XOPEN_VERSION 4
  47. #endif
  48. /* Commands and utilities from XPG4 are available. */
  49. #define _XOPEN_XCU_VERSION 4
  50. /* We are compatible with the old published standards as well. */
  51. #define _XOPEN_XPG2 1
  52. #define _XOPEN_XPG3 1
  53. #define _XOPEN_XPG4 1
  54. /* The X/Open Unix extensions are available. */
  55. #define _XOPEN_UNIX 1
  56. /* Encryption is present. */
  57. #define _XOPEN_CRYPT 1
  58. /* The enhanced internationalization capabilities according to XPG4.2
  59. are present. */
  60. #define _XOPEN_ENH_I18N 1
  61. /* The legacy interfaces are also available. */
  62. #define _XOPEN_LEGACY 1
  63. /* Get values of POSIX options:
  64. If these symbols are defined, the corresponding features are
  65. always available. If not, they may be available sometimes.
  66. The current values can be obtained with `sysconf'.
  67. _POSIX_JOB_CONTROL Job control is supported.
  68. _POSIX_SAVED_IDS Processes have a saved set-user-ID
  69. and a saved set-group-ID.
  70. _POSIX_REALTIME_SIGNALS Real-time, queued signals are supported.
  71. _POSIX_PRIORITY_SCHEDULING Priority scheduling is supported.
  72. _POSIX_TIMERS POSIX.4 clocks and timers are supported.
  73. _POSIX_ASYNCHRONOUS_IO Asynchronous I/O is supported.
  74. _POSIX_PRIORITIZED_IO Prioritized asynchronous I/O is supported.
  75. _POSIX_SYNCHRONIZED_IO Synchronizing file data is supported.
  76. _POSIX_FSYNC The fsync function is present.
  77. _POSIX_MAPPED_FILES Mapping of files to memory is supported.
  78. _POSIX_MEMLOCK Locking of all memory is supported.
  79. _POSIX_MEMLOCK_RANGE Locking of ranges of memory is supported.
  80. _POSIX_MEMORY_PROTECTION Setting of memory protections is supported.
  81. _POSIX_MESSAGE_PASSING POSIX.4 message queues are supported.
  82. _POSIX_SEMAPHORES POSIX.4 counting semaphores are supported.
  83. _POSIX_SHARED_MEMORY_OBJECTS POSIX.4 shared memory objects are supported.
  84. _POSIX_THREADS POSIX.1c pthreads are supported.
  85. _POSIX_THREAD_ATTR_STACKADDR Thread stack address attribute option supported.
  86. _POSIX_THREAD_ATTR_STACKSIZE Thread stack size attribute option supported.
  87. _POSIX_THREAD_SAFE_FUNCTIONS Thread-safe functions are supported.
  88. _POSIX_THREAD_PRIORITY_SCHEDULING
  89. POSIX.1c thread execution scheduling supported.
  90. _POSIX_THREAD_PRIO_INHERIT Thread priority inheritance option supported.
  91. _POSIX_THREAD_PRIO_PROTECT Thread priority protection option supported.
  92. _POSIX_THREAD_PROCESS_SHARED Process-shared synchronization supported.
  93. _POSIX_PII Protocol-independent interfaces are supported.
  94. _POSIX_PII_XTI XTI protocol-indep. interfaces are supported.
  95. _POSIX_PII_SOCKET Socket protocol-indep. interfaces are supported.
  96. _POSIX_PII_INTERNET Internet family of protocols supported.
  97. _POSIX_PII_INTERNET_STREAM Connection-mode Internet protocol supported.
  98. _POSIX_PII_INTERNET_DGRAM Connectionless Internet protocol supported.
  99. _POSIX_PII_OSI ISO/OSI family of protocols supported.
  100. _POSIX_PII_OSI_COTS Connection-mode ISO/OSI service supported.
  101. _POSIX_PII_OSI_CLTS Connectionless ISO/OSI service supported.
  102. _POSIX_POLL Implementation supports `poll' function.
  103. _POSIX_SELECT Implementation supports `select' and `pselect'.
  104. _XOPEN_REALTIME X/Open realtime support is available.
  105. _XOPEN_REALTIME_THREADS X/Open realtime thread support is available.
  106. _XOPEN_SHM Shared memory interface according to XPG4.2.
  107. _XBS5_ILP32_OFF32 Implementation provides environment with 32-bit
  108. int, long, pointer, and off_t types.
  109. _XBS5_ILP32_OFFBIG Implementation provides environment with 32-bit
  110. int, long, and pointer and off_t with at least
  111. 64 bits.
  112. _XBS5_LP64_OFF64 Implementation provides environment with 32-bit
  113. int, and 64-bit long, pointer, and off_t types.
  114. _XBS5_LPBIG_OFFBIG Implementation provides environment with at
  115. least 32 bits int and long, pointer, and off_t
  116. with at least 64 bits.
  117. If any of these symbols is defined as -1, the corresponding option is not
  118. true for any file. If any is defined as other than -1, the corresponding
  119. option is true for all files. If a symbol is not defined at all, the value
  120. for a specific file can be obtained from `pathconf' and `fpathconf'.
  121. _POSIX_CHOWN_RESTRICTED Only the super user can use `chown' to change
  122. the owner of a file. `chown' can only be used
  123. to change the group ID of a file to a group of
  124. which the calling process is a member.
  125. _POSIX_NO_TRUNC Pathname components longer than
  126. NAME_MAX generate an error.
  127. _POSIX_VDISABLE If defined, if the value of an element of the
  128. `c_cc' member of `struct termios' is
  129. _POSIX_VDISABLE, no character will have the
  130. effect associated with that element.
  131. _POSIX_SYNC_IO Synchronous I/O may be performed.
  132. _POSIX_ASYNC_IO Asynchronous I/O may be performed.
  133. _POSIX_PRIO_IO Prioritized Asynchronous I/O may be performed.
  134. Support for the Large File Support interface is not generally available.
  135. If it is available the following constants are defined to one.
  136. _LFS64_LARGEFILE Low-level I/O supports large files.
  137. _LFS64_STDIO Standard I/O supports large files.
  138. */
  139. #include <bits/posix_opt.h>
  140. /* Get the environment definitions from Unix98. */
  141. #ifdef __USE_UNIX98
  142. # include <bits/environments.h>
  143. #endif
  144. /* Standard file descriptors. */
  145. #define STDIN_FILENO 0 /* Standard input. */
  146. #define STDOUT_FILENO 1 /* Standard output. */
  147. #define STDERR_FILENO 2 /* Standard error output. */
  148. /* All functions that are not declared anywhere else. */
  149. #include <bits/types.h>
  150. #ifndef __ssize_t_defined
  151. typedef __ssize_t ssize_t;
  152. # define __ssize_t_defined
  153. #endif
  154. #define __need_size_t
  155. #define __need_NULL
  156. #include <stddef.h>
  157. #if defined __USE_XOPEN || defined __USE_XOPEN2K
  158. /* The Single Unix specification says that some more types are
  159. available here. */
  160. # ifndef __gid_t_defined
  161. typedef __gid_t gid_t;
  162. # define __gid_t_defined
  163. # endif
  164. # ifndef __uid_t_defined
  165. typedef __uid_t uid_t;
  166. # define __uid_t_defined
  167. # endif
  168. # ifndef __off_t_defined
  169. # ifndef __USE_FILE_OFFSET64
  170. typedef __off_t off_t;
  171. # else
  172. typedef __off64_t off_t;
  173. # endif
  174. # define __off_t_defined
  175. # endif
  176. # if defined __USE_LARGEFILE64 && !defined __off64_t_defined
  177. typedef __off64_t off64_t;
  178. # define __off64_t_defined
  179. # endif
  180. # ifndef __useconds_t_defined
  181. typedef __useconds_t useconds_t;
  182. # define __useconds_t_defined
  183. # endif
  184. # ifndef __pid_t_defined
  185. typedef __pid_t pid_t;
  186. # define __pid_t_defined
  187. # endif
  188. #endif /* X/Open */
  189. #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED
  190. # ifndef __intptr_t_defined
  191. typedef __intptr_t intptr_t;
  192. # define __intptr_t_defined
  193. # endif
  194. #endif
  195. #if defined __USE_BSD || defined __USE_XOPEN
  196. # ifndef __socklen_t_defined
  197. typedef __socklen_t socklen_t;
  198. # define __socklen_t_defined
  199. # endif
  200. #endif
  201. /* Values for the second argument to access.
  202. These may be OR'd together. */
  203. #define R_OK 4 /* Test for read permission. */
  204. #define W_OK 2 /* Test for write permission. */
  205. #define X_OK 1 /* Test for execute permission. */
  206. #define F_OK 0 /* Test for existence. */
  207. /* Test for access to NAME using the real UID and real GID. */
  208. extern int access (__const char *__name, int __type) __THROW __nonnull ((1));
  209. #if 0 /*def __USE_GNU*/
  210. /* Test for access to NAME using the effective UID and GID
  211. (as normal file operations use). */
  212. extern int euidaccess (__const char *__name, int __type)
  213. __THROW __nonnull ((1));
  214. #endif
  215. /* Values for the WHENCE argument to lseek. */
  216. #ifndef _STDIO_H /* <stdio.h> has the same definitions. */
  217. # define SEEK_SET 0 /* Seek from beginning of file. */
  218. # define SEEK_CUR 1 /* Seek from current position. */
  219. # define SEEK_END 2 /* Seek from end of file. */
  220. #endif
  221. #if defined __USE_BSD && !defined L_SET
  222. /* Old BSD names for the same constants; just for compatibility. */
  223. # define L_SET SEEK_SET
  224. # define L_INCR SEEK_CUR
  225. # define L_XTND SEEK_END
  226. #endif
  227. /* Move FD's file position to OFFSET bytes from the
  228. beginning of the file (if WHENCE is SEEK_SET),
  229. the current position (if WHENCE is SEEK_CUR),
  230. or the end of the file (if WHENCE is SEEK_END).
  231. Return the new file position. */
  232. #ifndef __USE_FILE_OFFSET64
  233. extern __off_t lseek (int __fd, __off_t __offset, int __whence) __THROW;
  234. #else
  235. # ifdef __REDIRECT_NTH
  236. extern __off64_t __REDIRECT_NTH (lseek,
  237. (int __fd, __off64_t __offset, int __whence),
  238. lseek64);
  239. # else
  240. # define lseek lseek64
  241. # endif
  242. #endif
  243. #ifdef __USE_LARGEFILE64
  244. extern __off64_t lseek64 (int __fd, __off64_t __offset, int __whence)
  245. __THROW;
  246. #endif
  247. /* Close the file descriptor FD.
  248. This function is a cancellation point and therefore not marked with
  249. __THROW. */
  250. extern int close (int __fd);
  251. /* Read NBYTES into BUF from FD. Return the
  252. number read, -1 for errors or 0 for EOF.
  253. This function is a cancellation point and therefore not marked with
  254. __THROW. */
  255. extern ssize_t read (int __fd, void *__buf, size_t __nbytes) __wur;
  256. /* Write N bytes of BUF to FD. Return the number written, or -1.
  257. This function is a cancellation point and therefore not marked with
  258. __THROW. */
  259. extern ssize_t write (int __fd, __const void *__buf, size_t __n) __wur;
  260. #ifdef __USE_UNIX98
  261. # ifndef __USE_FILE_OFFSET64
  262. /* Read NBYTES into BUF from FD at the given position OFFSET without
  263. changing the file pointer. Return the number read, -1 for errors
  264. or 0 for EOF.
  265. This function is a cancellation point and therefore not marked with
  266. __THROW. */
  267. extern ssize_t pread (int __fd, void *__buf, size_t __nbytes,
  268. __off_t __offset) __wur;
  269. /* Write N bytes of BUF to FD at the given position OFFSET without
  270. changing the file pointer. Return the number written, or -1.
  271. This function is a cancellation point and therefore not marked with
  272. __THROW. */
  273. extern ssize_t pwrite (int __fd, __const void *__buf, size_t __n,
  274. __off_t __offset) __wur;
  275. # else
  276. # ifdef __REDIRECT
  277. extern ssize_t __REDIRECT (pread, (int __fd, void *__buf, size_t __nbytes,
  278. __off64_t __offset),
  279. pread64) __wur;
  280. extern ssize_t __REDIRECT (pwrite, (int __fd, __const void *__buf,
  281. size_t __nbytes, __off64_t __offset),
  282. pwrite64) __wur;
  283. # else
  284. # define pread pread64
  285. # define pwrite pwrite64
  286. # endif
  287. # endif
  288. # ifdef __USE_LARGEFILE64
  289. /* Read NBYTES into BUF from FD at the given position OFFSET without
  290. changing the file pointer. Return the number read, -1 for errors
  291. or 0 for EOF. */
  292. extern ssize_t pread64 (int __fd, void *__buf, size_t __nbytes,
  293. __off64_t __offset) __wur;
  294. /* Write N bytes of BUF to FD at the given position OFFSET without
  295. changing the file pointer. Return the number written, or -1. */
  296. extern ssize_t pwrite64 (int __fd, __const void *__buf, size_t __n,
  297. __off64_t __offset) __wur;
  298. # endif
  299. #endif
  300. /* Create a one-way communication channel (pipe).
  301. If successful, two file descriptors are stored in PIPEDES;
  302. bytes written on PIPEDES[1] can be read from PIPEDES[0].
  303. Returns 0 if successful, -1 if not. */
  304. extern int pipe (int __pipedes[2]) __THROW __wur;
  305. /* Schedule an alarm. In SECONDS seconds, the process will get a SIGALRM.
  306. If SECONDS is zero, any currently scheduled alarm will be cancelled.
  307. The function returns the number of seconds remaining until the last
  308. alarm scheduled would have signaled, or zero if there wasn't one.
  309. There is no return value to indicate an error, but you can set `errno'
  310. to 0 and check its value after calling `alarm', and this might tell you.
  311. The signal may come late due to processor scheduling. */
  312. extern unsigned int alarm (unsigned int __seconds) __THROW;
  313. /* Make the process sleep for SECONDS seconds, or until a signal arrives
  314. and is not ignored. The function returns the number of seconds less
  315. than SECONDS which it actually slept (thus zero if it slept the full time).
  316. If a signal handler does a `longjmp' or modifies the handling of the
  317. SIGALRM signal while inside `sleep' call, the handling of the SIGALRM
  318. signal afterwards is undefined. There is no return value to indicate
  319. error, but if `sleep' returns SECONDS, it probably didn't work.
  320. This function is a cancellation point and therefore not marked with
  321. __THROW. */
  322. extern unsigned int sleep (unsigned int __seconds);
  323. #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
  324. /* Set an alarm to go off (generating a SIGALRM signal) in VALUE
  325. microseconds. If INTERVAL is nonzero, when the alarm goes off, the
  326. timer is reset to go off every INTERVAL microseconds thereafter.
  327. Returns the number of microseconds remaining before the alarm. */
  328. extern __useconds_t ualarm (__useconds_t __value, __useconds_t __interval)
  329. __THROW;
  330. /* Sleep USECONDS microseconds, or until a signal arrives that is not blocked
  331. or ignored.
  332. This function is a cancellation point and therefore not marked with
  333. __THROW. */
  334. extern int usleep (__useconds_t __useconds);
  335. #endif
  336. /* Suspend the process until a signal arrives.
  337. This always returns -1 and sets `errno' to EINTR.
  338. This function is a cancellation point and therefore not marked with
  339. __THROW. */
  340. extern int pause (void);
  341. /* Change the owner and group of FILE. */
  342. extern int chown (__const char *__file, __uid_t __owner, __gid_t __group)
  343. __THROW __nonnull ((1)) __wur;
  344. #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
  345. /* Change the owner and group of the file that FD is open on. */
  346. extern int fchown (int __fd, __uid_t __owner, __gid_t __group) __THROW __wur;
  347. /* Change owner and group of FILE, if it is a symbolic
  348. link the ownership of the symbolic link is changed. */
  349. extern int lchown (__const char *__file, __uid_t __owner, __gid_t __group)
  350. __THROW __nonnull ((1)) __wur;
  351. #endif /* Use BSD || X/Open Unix. */
  352. #if 0 /*def __USE_GNU*/
  353. /* Change the owner and group of FILE relative to the directory FD is open
  354. on. */
  355. extern int fchownat (int __fd, __const char *__file, __uid_t __owner,
  356. __gid_t __group, int __flag)
  357. __THROW __nonnull ((2)) __wur;
  358. #endif /* Use GNU. */
  359. /* Change the process's working directory to PATH. */
  360. extern int chdir (__const char *__path) __THROW __nonnull ((1)) __wur;
  361. #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
  362. /* Change the process's working directory to the one FD is open on. */
  363. extern int fchdir (int __fd) __THROW __wur;
  364. #endif
  365. /* Get the pathname of the current working directory,
  366. and put it in SIZE bytes of BUF. Returns NULL if the
  367. directory couldn't be determined or SIZE was too small.
  368. If successful, returns BUF. In GNU, if BUF is NULL,
  369. an array is allocated with `malloc'; the array is SIZE
  370. bytes long, unless SIZE == 0, in which case it is as
  371. big as necessary. */
  372. extern char *getcwd (char *__buf, size_t __size) __THROW __wur;
  373. #ifdef __USE_GNU
  374. /* Return a malloc'd string containing the current directory name.
  375. If the environment variable `PWD' is set, and its value is correct,
  376. that value is used. */
  377. extern char *get_current_dir_name (void) __THROW;
  378. #endif
  379. #if 0 /*defined __USE_BSD || defined __USE_XOPEN_EXTENDED*/
  380. /* Put the absolute pathname of the current working directory in BUF.
  381. If successful, return BUF. If not, put an error message in
  382. BUF and return NULL. BUF should be at least PATH_MAX bytes long. */
  383. extern char *getwd (char *__buf)
  384. __THROW __nonnull ((1)) __attribute_deprecated__ __wur;
  385. #endif
  386. /* Duplicate FD, returning a new file descriptor on the same file. */
  387. extern int dup (int __fd) __THROW __wur;
  388. /* Duplicate FD to FD2, closing FD2 and making it open on the same file. */
  389. extern int dup2 (int __fd, int __fd2) __THROW;
  390. /* NULL-terminated array of "NAME=VALUE" environment variables. */
  391. extern char **__environ;
  392. #ifdef __USE_GNU
  393. extern char **environ;
  394. #endif
  395. /* Replace the current process, executing PATH with arguments ARGV and
  396. environment ENVP. ARGV and ENVP are terminated by NULL pointers. */
  397. extern int execve (__const char *__path, char *__const __argv[],
  398. char *__const __envp[]) __THROW __nonnull ((1));
  399. #if 0 /*def __USE_GNU*/
  400. /* Execute the file FD refers to, overlaying the running program image.
  401. ARGV and ENVP are passed to the new program, as for `execve'. */
  402. extern int fexecve (int __fd, char *__const __argv[], char *__const __envp[])
  403. __THROW;
  404. #endif
  405. /* Execute PATH with arguments ARGV and environment from `environ'. */
  406. extern int execv (__const char *__path, char *__const __argv[])
  407. __THROW __nonnull ((1));
  408. /* Execute PATH with all arguments after PATH until a NULL pointer,
  409. and the argument after that for environment. */
  410. extern int execle (__const char *__path, __const char *__arg, ...)
  411. __THROW __nonnull ((1));
  412. /* Execute PATH with all arguments after PATH until
  413. a NULL pointer and environment from `environ'. */
  414. extern int execl (__const char *__path, __const char *__arg, ...)
  415. __THROW __nonnull ((1));
  416. /* Execute FILE, searching in the `PATH' environment variable if it contains
  417. no slashes, with arguments ARGV and environment from `environ'. */
  418. extern int execvp (__const char *__file, char *__const __argv[])
  419. __THROW __nonnull ((1));
  420. /* Execute FILE, searching in the `PATH' environment variable if
  421. it contains no slashes, with all arguments after FILE until a
  422. NULL pointer and environment from `environ'. */
  423. extern int execlp (__const char *__file, __const char *__arg, ...)
  424. __THROW __nonnull ((1));
  425. #if defined __USE_MISC || defined __USE_XOPEN
  426. /* Add INC to priority of the current process. */
  427. extern int nice (int __inc) __THROW __wur;
  428. #endif
  429. /* Terminate program execution with the low-order 8 bits of STATUS. */
  430. extern void _exit (int __status) __attribute__ ((__noreturn__));
  431. /* Get the `_PC_*' symbols for the NAME argument to `pathconf' and `fpathconf';
  432. the `_SC_*' symbols for the NAME argument to `sysconf';
  433. and the `_CS_*' symbols for the NAME argument to `confstr'. */
  434. #include <bits/confname.h>
  435. /* Get file-specific configuration information about PATH. */
  436. extern long int pathconf (__const char *__path, int __name)
  437. __THROW __nonnull ((1));
  438. /* Get file-specific configuration about descriptor FD. */
  439. extern long int fpathconf (int __fd, int __name) __THROW;
  440. /* Get the value of the system variable NAME. */
  441. extern long int sysconf (int __name) __THROW __attribute__ ((__const__));
  442. #ifdef __USE_POSIX2
  443. /* Get the value of the string-valued system variable NAME. */
  444. extern size_t confstr (int __name, char *__buf, size_t __len) __THROW;
  445. #endif
  446. /* Get the process ID of the calling process. */
  447. extern __pid_t getpid (void) __THROW;
  448. /* Get the process ID of the calling process's parent. */
  449. extern __pid_t getppid (void) __THROW;
  450. /* Get the process group ID of the calling process.
  451. This function is different on old BSD. */
  452. #ifndef __FAVOR_BSD
  453. extern __pid_t getpgrp (void) __THROW;
  454. #else
  455. # ifdef __REDIRECT_NTH
  456. extern __pid_t __REDIRECT_NTH (getpgrp, (__pid_t __pid), __getpgid);
  457. # else
  458. # define getpgrp __getpgid
  459. # endif
  460. #endif
  461. /* Get the process group ID of process PID. */
  462. extern __pid_t __getpgid (__pid_t __pid) __THROW;
  463. #ifdef __USE_XOPEN_EXTENDED
  464. extern __pid_t getpgid (__pid_t __pid) __THROW;
  465. #endif
  466. /* Set the process group ID of the process matching PID to PGID.
  467. If PID is zero, the current process's process group ID is set.
  468. If PGID is zero, the process ID of the process is used. */
  469. extern int setpgid (__pid_t __pid, __pid_t __pgid) __THROW;
  470. #if defined __USE_SVID || defined __USE_BSD || defined __USE_XOPEN_EXTENDED
  471. /* Both System V and BSD have `setpgrp' functions, but with different
  472. calling conventions. The BSD function is the same as POSIX.1 `setpgid'
  473. (above). The System V function takes no arguments and puts the calling
  474. process in its on group like `setpgid (0, 0)'.
  475. New programs should always use `setpgid' instead.
  476. The default in GNU is to provide the System V function. The BSD
  477. function is available under -D_BSD_SOURCE. */
  478. # ifndef __FAVOR_BSD
  479. /* Set the process group ID of the calling process to its own PID.
  480. This is exactly the same as `setpgid (0, 0)'. */
  481. extern int setpgrp (void) __THROW;
  482. # else
  483. /* Another name for `setpgid' (above). */
  484. # ifdef __REDIRECT_NTH
  485. extern int __REDIRECT_NTH (setpgrp, (__pid_t __pid, __pid_t __pgrp), setpgid);
  486. # else
  487. # define setpgrp setpgid
  488. # endif
  489. # endif /* Favor BSD. */
  490. #endif /* Use SVID or BSD. */
  491. /* Create a new session with the calling process as its leader.
  492. The process group IDs of the session and the calling process
  493. are set to the process ID of the calling process, which is returned. */
  494. extern __pid_t setsid (void) __THROW;
  495. #ifdef __USE_XOPEN_EXTENDED
  496. /* Return the session ID of the given process. */
  497. extern __pid_t getsid (__pid_t __pid) __THROW;
  498. #endif
  499. /* Get the real user ID of the calling process. */
  500. extern __uid_t getuid (void) __THROW;
  501. /* Get the effective user ID of the calling process. */
  502. extern __uid_t geteuid (void) __THROW;
  503. /* Get the real group ID of the calling process. */
  504. extern __gid_t getgid (void) __THROW;
  505. /* Get the effective group ID of the calling process. */
  506. extern __gid_t getegid (void) __THROW;
  507. /* If SIZE is zero, return the number of supplementary groups
  508. the calling process is in. Otherwise, fill in the group IDs
  509. of its supplementary groups in LIST and return the number written. */
  510. extern int getgroups (int __size, __gid_t __list[]) __THROW __wur;
  511. #if 0 /*def __USE_GNU*/
  512. /* Return nonzero iff the calling process is in group GID. */
  513. extern int group_member (__gid_t __gid) __THROW;
  514. #endif
  515. /* Set the user ID of the calling process to UID.
  516. If the calling process is the super-user, set the real
  517. and effective user IDs, and the saved set-user-ID to UID;
  518. if not, the effective user ID is set to UID. */
  519. extern int setuid (__uid_t __uid) __THROW;
  520. #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
  521. /* Set the real user ID of the calling process to RUID,
  522. and the effective user ID of the calling process to EUID. */
  523. extern int setreuid (__uid_t __ruid, __uid_t __euid) __THROW;
  524. #endif
  525. #if defined __USE_BSD || defined __USE_XOPEN2K
  526. /* Set the effective user ID of the calling process to UID. */
  527. extern int seteuid (__uid_t __uid) __THROW;
  528. #endif /* Use BSD. */
  529. /* Set the group ID of the calling process to GID.
  530. If the calling process is the super-user, set the real
  531. and effective group IDs, and the saved set-group-ID to GID;
  532. if not, the effective group ID is set to GID. */
  533. extern int setgid (__gid_t __gid) __THROW;
  534. #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
  535. /* Set the real group ID of the calling process to RGID,
  536. and the effective group ID of the calling process to EGID. */
  537. extern int setregid (__gid_t __rgid, __gid_t __egid) __THROW;
  538. #endif
  539. #if defined __USE_BSD || defined __USE_XOPEN2K
  540. /* Set the effective group ID of the calling process to GID. */
  541. extern int setegid (__gid_t __gid) __THROW;
  542. #endif /* Use BSD. */
  543. #ifdef __USE_GNU
  544. /* Fetch the effective user ID, real user ID, and saved-set user ID,
  545. of the calling process. */
  546. extern int getresuid (__uid_t *__euid, __uid_t *__ruid, __uid_t *__suid)
  547. __THROW;
  548. /* Fetch the effective group ID, real group ID, and saved-set group ID,
  549. of the calling process. */
  550. extern int getresgid (__gid_t *__egid, __gid_t *__rgid, __gid_t *__sgid)
  551. __THROW;
  552. /* Set the effective user ID, real user ID, and saved-set user ID,
  553. of the calling process to EUID, RUID, and SUID, respectively. */
  554. extern int setresuid (__uid_t __euid, __uid_t __ruid, __uid_t __suid)
  555. __THROW;
  556. /* Set the effective group ID, real group ID, and saved-set group ID,
  557. of the calling process to EGID, RGID, and SGID, respectively. */
  558. extern int setresgid (__gid_t __egid, __gid_t __rgid, __gid_t __sgid)
  559. __THROW;
  560. #endif
  561. #ifdef __ARCH_HAS_MMU__
  562. /* Clone the calling process, creating an exact copy.
  563. Return -1 for errors, 0 to the new process,
  564. and the process ID of the new process to the old process. */
  565. extern __pid_t fork (void) __THROW;
  566. #endif
  567. #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
  568. /* Clone the calling process, but without copying the whole address space.
  569. The calling process is suspended until the new process exits or is
  570. replaced by a call to `execve'. Return -1 for errors, 0 to the new process,
  571. and the process ID of the new process to the old process. */
  572. extern __pid_t vfork (void) __THROW;
  573. #endif /* Use BSD. */
  574. /* Return the pathname of the terminal FD is open on, or NULL on errors.
  575. The returned storage is good only until the next call to this function. */
  576. extern char *ttyname (int __fd) __THROW;
  577. /* Store at most BUFLEN characters of the pathname of the terminal FD is
  578. open on in BUF. Return 0 on success, otherwise an error number. */
  579. extern int ttyname_r (int __fd, char *__buf, size_t __buflen)
  580. __THROW __nonnull ((2)) __wur;
  581. /* Return 1 if FD is a valid descriptor associated
  582. with a terminal, zero if not. */
  583. extern int isatty (int __fd) __THROW;
  584. #if 0 /*defined __USE_BSD \
  585. || (defined __USE_XOPEN_EXTENDED && !defined __USE_UNIX98)*/
  586. /* Return the index into the active-logins file (utmp) for
  587. the controlling terminal. */
  588. extern int ttyslot (void) __THROW;
  589. #endif
  590. /* Make a link to FROM named TO. */
  591. extern int link (__const char *__from, __const char *__to)
  592. __THROW __nonnull ((1, 2)) __wur;
  593. #if 0 /*def __USE_GNU*/
  594. /* Like link but relative paths in TO and FROM are interpreted relative
  595. to FROMFD and TOFD respectively. */
  596. extern int linkat (int __fromfd, __const char *__from, int __tofd,
  597. __const char *__to) __THROW __nonnull ((2, 4)) __wur;
  598. #endif
  599. #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K
  600. /* Make a symbolic link to FROM named TO. */
  601. extern int symlink (__const char *__from, __const char *__to)
  602. __THROW __nonnull ((1, 2)) __wur;
  603. /* Read the contents of the symbolic link PATH into no more than
  604. LEN bytes of BUF. The contents are not null-terminated.
  605. Returns the number of characters read, or -1 for errors. */
  606. extern int readlink (__const char *__restrict __path, char *__restrict __buf,
  607. size_t __len) __THROW __nonnull ((1, 2)) __wur;
  608. #endif /* Use BSD. */
  609. #if 0 /*def __USE_GNU*/
  610. /* Like symlink but a relative path in TO is interpreted relative to TOFD. */
  611. extern int symlinkat (__const char *__from, int __tofd,
  612. __const char *__to) __THROW __nonnull ((1, 3)) __wur;
  613. /* Like readlink but a relative PATH is interpreted relative to FD. */
  614. extern int readlinkat (int __fd, __const char *__restrict __path,
  615. char *__restrict __buf, size_t __len)
  616. __THROW __nonnull ((2, 3)) __wur;
  617. #endif
  618. /* Remove the link NAME. */
  619. extern int unlink (__const char *__name) __THROW __nonnull ((1));
  620. #if 0 /*def __USE_GNU*/
  621. /* Remove the link NAME relative to FD. */
  622. extern int unlinkat (int __fd, __const char *__name, int __flag)
  623. __THROW __nonnull ((2));
  624. #endif
  625. /* Remove the directory PATH. */
  626. extern int rmdir (__const char *__path) __THROW __nonnull ((1));
  627. /* Return the foreground process group ID of FD. */
  628. extern __pid_t tcgetpgrp (int __fd) __THROW;
  629. /* Set the foreground process group ID of FD set PGRP_ID. */
  630. extern int tcsetpgrp (int __fd, __pid_t __pgrp_id) __THROW;
  631. /* Return the login name of the user.
  632. This function is a possible cancellation points and therefore not
  633. marked with __THROW. */
  634. extern char *getlogin (void);
  635. #if defined __USE_REENTRANT || defined __USE_UNIX98
  636. /* Return at most NAME_LEN characters of the login name of the user in NAME.
  637. If it cannot be determined or some other error occurred, return the error
  638. code. Otherwise return 0.
  639. This function is a possible cancellation points and therefore not
  640. marked with __THROW. */
  641. extern int getlogin_r (char *__name, size_t __name_len) __nonnull ((1));
  642. #endif
  643. #if 0 /*def __USE_BSD*/
  644. /* Set the login name returned by `getlogin'. */
  645. extern int setlogin (__const char *__name) __THROW __nonnull ((1));
  646. #endif
  647. #ifdef __USE_POSIX2
  648. /* Get definitions and prototypes for functions to process the
  649. arguments in ARGV (ARGC of them, minus the program name) for
  650. options given in OPTS. */
  651. # define __need_getopt
  652. # include <bits/getopt.h>
  653. #endif
  654. #if defined __USE_BSD || defined __USE_UNIX98
  655. /* Put the name of the current host in no more than LEN bytes of NAME.
  656. The result is null-terminated if LEN is large enough for the full
  657. name and the terminator. */
  658. extern int gethostname (char *__name, size_t __len) __THROW __nonnull ((1));
  659. #endif
  660. #if defined __USE_BSD || (defined __USE_XOPEN && !defined __USE_UNIX98)
  661. /* Set the name of the current host to NAME, which is LEN bytes long.
  662. This call is restricted to the super-user. */
  663. extern int sethostname (__const char *__name, size_t __len)
  664. __THROW __nonnull ((1)) __wur;
  665. /* Set the current machine's Internet number to ID.
  666. This call is restricted to the super-user. */
  667. extern int sethostid (long int __id) __THROW __wur;
  668. /* Get and set the NIS (aka YP) domain name, if any.
  669. Called just like `gethostname' and `sethostname'.
  670. The NIS domain name is usually the empty string when not using NIS. */
  671. extern int getdomainname (char *__name, size_t __len)
  672. __THROW __nonnull ((1)) __wur;
  673. extern int setdomainname (__const char *__name, size_t __len)
  674. __THROW __nonnull ((1)) __wur;
  675. /* Revoke access permissions to all processes currently communicating
  676. with the control terminal, and then send a SIGHUP signal to the process
  677. group of the control terminal. */
  678. extern int vhangup (void) __THROW;
  679. #if 0
  680. /* Revoke the access of all descriptors currently open on FILE. */
  681. extern int revoke (__const char *__file) __THROW __nonnull ((1)) __wur;
  682. /* Enable statistical profiling, writing samples of the PC into at most
  683. SIZE bytes of SAMPLE_BUFFER; every processor clock tick while profiling
  684. is enabled, the system examines the user PC and increments
  685. SAMPLE_BUFFER[((PC - OFFSET) / 2) * SCALE / 65536]. If SCALE is zero,
  686. disable profiling. Returns zero on success, -1 on error. */
  687. extern int profil (unsigned short int *__sample_buffer, size_t __size,
  688. size_t __offset, unsigned int __scale)
  689. __THROW __nonnull ((1));
  690. #endif
  691. /* Turn accounting on if NAME is an existing file. The system will then write
  692. a record for each process as it terminates, to this file. If NAME is NULL,
  693. turn accounting off. This call is restricted to the super-user. */
  694. extern int acct (__const char *__name) __THROW;
  695. /* Successive calls return the shells listed in `/etc/shells'. */
  696. extern char *getusershell (void) __THROW;
  697. extern void endusershell (void) __THROW; /* Discard cached info. */
  698. extern void setusershell (void) __THROW; /* Rewind and re-read the file. */
  699. #ifdef __ARCH_HAS_MMU__
  700. /* Put the program in the background, and dissociate from the controlling
  701. terminal. If NOCHDIR is zero, do `chdir ("/")'. If NOCLOSE is zero,
  702. redirects stdin, stdout, and stderr to /dev/null. */
  703. extern int daemon (int __nochdir, int __noclose) __THROW __wur;
  704. #endif
  705. #endif /* Use BSD || X/Open. */
  706. #if defined __USE_BSD || (defined __USE_XOPEN && !defined __USE_XOPEN2K)
  707. /* Make PATH be the root directory (the starting point for absolute paths).
  708. This call is restricted to the super-user. */
  709. extern int chroot (__const char *__path) __THROW __nonnull ((1)) __wur;
  710. /* Prompt with PROMPT and read a string from the terminal without echoing.
  711. Uses /dev/tty if possible; otherwise stderr and stdin. */
  712. extern char *getpass (__const char *__prompt) __nonnull ((1));
  713. #endif /* Use BSD || X/Open. */
  714. #if defined __USE_BSD || defined __USE_XOPEN
  715. /* Make all changes done to FD actually appear on disk.
  716. This function is a cancellation point and therefore not marked with
  717. __THROW. */
  718. extern int fsync (int __fd);
  719. #endif /* Use BSD || X/Open. */
  720. #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
  721. /* Return identifier for the current host. */
  722. extern long int gethostid (void);
  723. /* Make all changes done to all files actually appear on disk. */
  724. extern void sync (void) __THROW;
  725. /* Return the number of bytes in a page. This is the system's page size,
  726. which is not necessarily the same as the hardware page size. */
  727. extern int getpagesize (void) __THROW __attribute__ ((__const__));
  728. /* Return the maximum number of file descriptors
  729. the current process could possibly have. */
  730. extern int getdtablesize (void) __THROW;
  731. /* Truncate FILE to LENGTH bytes. */
  732. # ifndef __USE_FILE_OFFSET64
  733. extern int truncate (__const char *__file, __off_t __length)
  734. __THROW __nonnull ((1)) __wur;
  735. # else
  736. # ifdef __REDIRECT_NTH
  737. extern int __REDIRECT_NTH (truncate,
  738. (__const char *__file, __off64_t __length),
  739. truncate64) __nonnull ((1)) __wur;
  740. # else
  741. # define truncate truncate64
  742. # endif
  743. # endif
  744. # ifdef __USE_LARGEFILE64
  745. extern int truncate64 (__const char *__file, __off64_t __length)
  746. __THROW __nonnull ((1)) __wur;
  747. # endif
  748. #endif /* Use BSD || X/Open Unix. */
  749. #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K
  750. /* Truncate the file FD is open on to LENGTH bytes. */
  751. # ifndef __USE_FILE_OFFSET64
  752. extern int ftruncate (int __fd, __off_t __length) __THROW __wur;
  753. # else
  754. # ifdef __REDIRECT_NTH
  755. extern int __REDIRECT_NTH (ftruncate, (int __fd, __off64_t __length),
  756. ftruncate64) __wur;
  757. # else
  758. # define ftruncate ftruncate64
  759. # endif
  760. # endif
  761. # ifdef __USE_LARGEFILE64
  762. extern int ftruncate64 (int __fd, __off64_t __length) __THROW __wur;
  763. # endif
  764. #endif /* Use BSD || X/Open Unix || POSIX 2003. */
  765. #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED
  766. /* Set the end of accessible data space (aka "the break") to ADDR.
  767. Returns zero on success and -1 for errors (with errno set). */
  768. extern int brk (void *__addr) __THROW __wur;
  769. /* Increase or decrease the end of accessible data space by DELTA bytes.
  770. If successful, returns the address the previous end of data space
  771. (i.e. the beginning of the new space, if DELTA > 0);
  772. returns (void *) -1 for errors (with errno set). */
  773. extern void *sbrk (intptr_t __delta) __THROW;
  774. #endif
  775. #ifdef __USE_MISC
  776. /* Invoke `system call' number SYSNO, passing it the remaining arguments.
  777. This is completely system-dependent, and not often useful.
  778. In Unix, `syscall' sets `errno' for all errors and most calls return -1
  779. for errors; in many systems you cannot pass arguments or get return
  780. values for all system calls (`pipe', `fork', and `getppid' typically
  781. among them).
  782. In Mach, all system calls take normal arguments and always return an
  783. error code (zero for success). */
  784. extern long int syscall (long int __sysno, ...) __THROW;
  785. #endif /* Use misc. */
  786. #if (defined __USE_MISC || defined __USE_XOPEN_EXTENDED) && !defined F_LOCK
  787. /* NOTE: These declarations also appear in <fcntl.h>; be sure to keep both
  788. files consistent. Some systems have them there and some here, and some
  789. software depends on the macros being defined without including both. */
  790. /* `lockf' is a simpler interface to the locking facilities of `fcntl'.
  791. LEN is always relative to the current file position.
  792. The CMD argument is one of the following.
  793. This function is a cancellation point and therefore not marked with
  794. __THROW. */
  795. # define F_ULOCK 0 /* Unlock a previously locked region. */
  796. # define F_LOCK 1 /* Lock a region for exclusive use. */
  797. # define F_TLOCK 2 /* Test and lock a region for exclusive use. */
  798. # define F_TEST 3 /* Test a region for other processes locks. */
  799. # ifndef __USE_FILE_OFFSET64
  800. extern int lockf (int __fd, int __cmd, __off_t __len) __wur;
  801. # else
  802. # ifdef __REDIRECT
  803. extern int __REDIRECT (lockf, (int __fd, int __cmd, __off64_t __len),
  804. lockf64) __wur;
  805. # else
  806. # define lockf lockf64
  807. # endif
  808. # endif
  809. # ifdef __USE_LARGEFILE64
  810. extern int lockf64 (int __fd, int __cmd, __off64_t __len) __wur;
  811. # endif
  812. #endif /* Use misc and F_LOCK not already defined. */
  813. #ifdef __USE_GNU
  814. /* Evaluate EXPRESSION, and repeat as long as it returns -1 with `errno'
  815. set to EINTR. */
  816. # define TEMP_FAILURE_RETRY(expression) \
  817. (__extension__ \
  818. ({ long int __result; \
  819. do __result = (long int) (expression); \
  820. while (__result == -1L && errno == EINTR); \
  821. __result; }))
  822. #endif
  823. #if defined __USE_POSIX199309 || defined __USE_UNIX98
  824. /* Synchronize at least the data part of a file with the underlying
  825. media. */
  826. extern int fdatasync (int __fildes) __THROW;
  827. #endif /* Use POSIX199309 */
  828. /* XPG4.2 specifies that prototypes for the encryption functions must
  829. be defined here. */
  830. #ifdef __USE_XOPEN
  831. /* Encrypt at most 8 characters from KEY using salt to perturb DES. */
  832. extern char *crypt (__const char *__key, __const char *__salt)
  833. __THROW __nonnull ((1, 2));
  834. /* Encrypt data in BLOCK in place if EDFLAG is zero; otherwise decrypt
  835. block in place. */
  836. extern void encrypt (char *__block, int __edflag) __THROW __nonnull ((1));
  837. /* Swab pairs bytes in the first N bytes of the area pointed to by
  838. FROM and copy the result to TO. The value of TO must not be in the
  839. range [FROM - N + 1, FROM - 1]. If N is odd the first byte in FROM
  840. is without partner. */
  841. extern void swab (__const void *__restrict __from, void *__restrict __to,
  842. ssize_t __n) __THROW __nonnull ((1, 2));
  843. #endif
  844. /* The Single Unix specification demands this prototype to be here.
  845. It is also found in <stdio.h>. */
  846. #ifdef __USE_XOPEN
  847. /* Return the name of the controlling terminal. */
  848. extern char *ctermid (char *__s) __THROW;
  849. #endif
  850. /* Define some macros helping to catch buffer overflows. */
  851. #if __USE_FORTIFY_LEVEL > 0 && !defined __cplusplus
  852. # include <bits/unistd.h>
  853. #endif
  854. __END_DECLS
  855. #endif /* unistd.h */