unistd.h 45 KB

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  1. /* Copyright (C) 1991-2006, 2007, 2008, 2009 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, see
  13. <http://www.gnu.org/licenses/>. */
  14. /*
  15. * POSIX Standard: 2.10 Symbolic Constants <unistd.h>
  16. */
  17. #ifndef _UNISTD_H
  18. #define _UNISTD_H 1
  19. #include <features.h>
  20. __BEGIN_DECLS
  21. /* These may be used to determine what facilities are present at compile time.
  22. Their values can be obtained at run time from `sysconf'. */
  23. #ifdef __USE_XOPEN2K8
  24. /* POSIX Standard approved as ISO/IEC 9945-1 as of September 2008. */
  25. # define _POSIX_VERSION 200809L
  26. #elif defined __USE_XOPEN2K
  27. /* POSIX Standard approved as ISO/IEC 9945-1 as of December 2001. */
  28. # define _POSIX_VERSION 200112L
  29. #elif defined __USE_POSIX199506
  30. /* POSIX Standard approved as ISO/IEC 9945-1 as of June 1995. */
  31. # define _POSIX_VERSION 199506L
  32. #elif defined __USE_POSIX199309
  33. /* POSIX Standard approved as ISO/IEC 9945-1 as of September 1993. */
  34. # define _POSIX_VERSION 199309L
  35. #else
  36. /* POSIX Standard approved as ISO/IEC 9945-1 as of September 1990. */
  37. # define _POSIX_VERSION 199009L
  38. #endif
  39. /* These are not #ifdef __USE_POSIX2 because they are
  40. in the theoretically application-owned namespace. */
  41. #ifdef __USE_XOPEN2K8
  42. # define __POSIX2_THIS_VERSION 200809L
  43. /* The utilities on GNU systems also correspond to this version. */
  44. #elif defined __USE_XOPEN2K
  45. /* The utilities on GNU systems also correspond to this version. */
  46. # define __POSIX2_THIS_VERSION 200112L
  47. #elif defined __USE_POSIX199506
  48. /* The utilities on GNU systems also correspond to this version. */
  49. # define __POSIX2_THIS_VERSION 199506L
  50. #else
  51. /* The utilities on GNU systems also correspond to this version. */
  52. # define __POSIX2_THIS_VERSION 199209L
  53. #endif
  54. /* The utilities on GNU systems also correspond to this version. */
  55. #define _POSIX2_VERSION __POSIX2_THIS_VERSION
  56. /* If defined, the implementation supports the
  57. C Language Bindings Option. */
  58. #define _POSIX2_C_BIND __POSIX2_THIS_VERSION
  59. /* If defined, the implementation supports the
  60. C Language Development Utilities Option. */
  61. #define _POSIX2_C_DEV __POSIX2_THIS_VERSION
  62. /* If defined, the implementation supports the
  63. Software Development Utilities Option. */
  64. #define _POSIX2_SW_DEV __POSIX2_THIS_VERSION
  65. #if 0 /* uClibc does not provide the utility */
  66. /* If defined, the implementation supports the
  67. creation of locales with the localedef utility. */
  68. #define _POSIX2_LOCALEDEF __POSIX2_THIS_VERSION
  69. #endif
  70. /* X/Open version number to which the library conforms. It is selectable. */
  71. #ifdef __USE_XOPEN2K8
  72. # define _XOPEN_VERSION 700
  73. #elif defined __USE_XOPEN2K
  74. # define _XOPEN_VERSION 600
  75. #elif defined __USE_UNIX98
  76. # define _XOPEN_VERSION 500
  77. #else
  78. # define _XOPEN_VERSION 4
  79. #endif
  80. /* Commands and utilities from XPG4 are available. */
  81. #define _XOPEN_XCU_VERSION 4
  82. /* We are compatible with the old published standards as well. */
  83. #define _XOPEN_XPG2 1
  84. #define _XOPEN_XPG3 1
  85. #define _XOPEN_XPG4 1
  86. /* The X/Open Unix extensions are available. */
  87. #define _XOPEN_UNIX 1
  88. /* Encryption is present. */
  89. #define _XOPEN_CRYPT 1
  90. /* The enhanced internationalization capabilities according to XPG4.2
  91. are present. */
  92. #define _XOPEN_ENH_I18N 1
  93. /* The legacy interfaces are also available. */
  94. #define _XOPEN_LEGACY 1
  95. /* Get values of POSIX options:
  96. If these symbols are defined, the corresponding features are
  97. always available. If not, they may be available sometimes.
  98. The current values can be obtained with `sysconf'.
  99. _POSIX_JOB_CONTROL Job control is supported.
  100. _POSIX_SAVED_IDS Processes have a saved set-user-ID
  101. and a saved set-group-ID.
  102. _POSIX_REALTIME_SIGNALS Real-time, queued signals are supported.
  103. _POSIX_PRIORITY_SCHEDULING Priority scheduling is supported.
  104. _POSIX_TIMERS POSIX.4 clocks and timers are supported.
  105. _POSIX_ASYNCHRONOUS_IO Asynchronous I/O is supported.
  106. _POSIX_PRIORITIZED_IO Prioritized asynchronous I/O is supported.
  107. _POSIX_SYNCHRONIZED_IO Synchronizing file data is supported.
  108. _POSIX_FSYNC The fsync function is present.
  109. _POSIX_MAPPED_FILES Mapping of files to memory is supported.
  110. _POSIX_MEMLOCK Locking of all memory is supported.
  111. _POSIX_MEMLOCK_RANGE Locking of ranges of memory is supported.
  112. _POSIX_MEMORY_PROTECTION Setting of memory protections is supported.
  113. _POSIX_MESSAGE_PASSING POSIX.4 message queues are supported.
  114. _POSIX_SEMAPHORES POSIX.4 counting semaphores are supported.
  115. _POSIX_SHARED_MEMORY_OBJECTS POSIX.4 shared memory objects are supported.
  116. _POSIX_THREADS POSIX.1c pthreads are supported.
  117. _POSIX_THREAD_ATTR_STACKADDR Thread stack address attribute option supported.
  118. _POSIX_THREAD_ATTR_STACKSIZE Thread stack size attribute option supported.
  119. _POSIX_THREAD_SAFE_FUNCTIONS Thread-safe functions are supported.
  120. _POSIX_THREAD_PRIORITY_SCHEDULING
  121. POSIX.1c thread execution scheduling supported.
  122. _POSIX_THREAD_PRIO_INHERIT Thread priority inheritance option supported.
  123. _POSIX_THREAD_PRIO_PROTECT Thread priority protection option supported.
  124. _POSIX_THREAD_PROCESS_SHARED Process-shared synchronization supported.
  125. _POSIX_PII Protocol-independent interfaces are supported.
  126. _POSIX_PII_XTI XTI protocol-indep. interfaces are supported.
  127. _POSIX_PII_SOCKET Socket protocol-indep. interfaces are supported.
  128. _POSIX_PII_INTERNET Internet family of protocols supported.
  129. _POSIX_PII_INTERNET_STREAM Connection-mode Internet protocol supported.
  130. _POSIX_PII_INTERNET_DGRAM Connectionless Internet protocol supported.
  131. _POSIX_PII_OSI ISO/OSI family of protocols supported.
  132. _POSIX_PII_OSI_COTS Connection-mode ISO/OSI service supported.
  133. _POSIX_PII_OSI_CLTS Connectionless ISO/OSI service supported.
  134. _POSIX_POLL Implementation supports `poll' function.
  135. _POSIX_SELECT Implementation supports `select' and `pselect'.
  136. _XOPEN_REALTIME X/Open realtime support is available.
  137. _XOPEN_REALTIME_THREADS X/Open realtime thread support is available.
  138. _XOPEN_SHM Shared memory interface according to XPG4.2.
  139. _XBS5_ILP32_OFF32 Implementation provides environment with 32-bit
  140. int, long, pointer, and off_t types.
  141. _XBS5_ILP32_OFFBIG Implementation provides environment with 32-bit
  142. int, long, and pointer and off_t with at least
  143. 64 bits.
  144. _XBS5_LP64_OFF64 Implementation provides environment with 32-bit
  145. int, and 64-bit long, pointer, and off_t types.
  146. _XBS5_LPBIG_OFFBIG Implementation provides environment with at
  147. least 32 bits int and long, pointer, and off_t
  148. with at least 64 bits.
  149. If any of these symbols is defined as -1, the corresponding option is not
  150. true for any file. If any is defined as other than -1, the corresponding
  151. option is true for all files. If a symbol is not defined at all, the value
  152. for a specific file can be obtained from `pathconf' and `fpathconf'.
  153. _POSIX_CHOWN_RESTRICTED Only the super user can use `chown' to change
  154. the owner of a file. `chown' can only be used
  155. to change the group ID of a file to a group of
  156. which the calling process is a member.
  157. _POSIX_NO_TRUNC Pathname components longer than
  158. NAME_MAX generate an error.
  159. _POSIX_VDISABLE If defined, if the value of an element of the
  160. `c_cc' member of `struct termios' is
  161. _POSIX_VDISABLE, no character will have the
  162. effect associated with that element.
  163. _POSIX_SYNC_IO Synchronous I/O may be performed.
  164. _POSIX_ASYNC_IO Asynchronous I/O may be performed.
  165. _POSIX_PRIO_IO Prioritized Asynchronous I/O may be performed.
  166. Support for the Large File Support interface is not generally available.
  167. If it is available the following constants are defined to one.
  168. _LFS64_LARGEFILE Low-level I/O supports large files.
  169. _LFS64_STDIO Standard I/O supports large files.
  170. */
  171. #include <bits/posix_opt.h>
  172. /* keep it after posix_opt.h, it overwrites based on uClibc's config options */
  173. #include <bits/uClibc_posix_opt.h>
  174. /* Get the environment definitions from Unix98. */
  175. #if defined __USE_UNIX98 || defined __USE_XOPEN2K
  176. # include <bits/environments.h>
  177. #endif
  178. /* Standard file descriptors. */
  179. #define STDIN_FILENO 0 /* Standard input. */
  180. #define STDOUT_FILENO 1 /* Standard output. */
  181. #define STDERR_FILENO 2 /* Standard error output. */
  182. /* All functions that are not declared anywhere else. */
  183. #include <bits/types.h>
  184. #ifndef __ssize_t_defined
  185. typedef __ssize_t ssize_t;
  186. # define __ssize_t_defined
  187. #endif
  188. #define __need_size_t
  189. #define __need_NULL
  190. #include <stddef.h>
  191. #if defined __USE_XOPEN || defined __USE_XOPEN2K
  192. /* The Single Unix specification says that some more types are
  193. available here. */
  194. # ifndef __gid_t_defined
  195. typedef __gid_t gid_t;
  196. # define __gid_t_defined
  197. # endif
  198. # ifndef __uid_t_defined
  199. typedef __uid_t uid_t;
  200. # define __uid_t_defined
  201. # endif
  202. # ifndef __off_t_defined
  203. # ifndef __USE_FILE_OFFSET64
  204. typedef __off_t off_t;
  205. # else
  206. typedef __off64_t off_t;
  207. # endif
  208. # define __off_t_defined
  209. # endif
  210. # if defined __USE_LARGEFILE64 && !defined __off64_t_defined
  211. typedef __off64_t off64_t;
  212. # define __off64_t_defined
  213. # endif
  214. # ifndef __useconds_t_defined
  215. typedef __useconds_t useconds_t;
  216. # define __useconds_t_defined
  217. # endif
  218. # ifndef __pid_t_defined
  219. typedef __pid_t pid_t;
  220. # define __pid_t_defined
  221. # endif
  222. #endif /* X/Open */
  223. #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K
  224. # ifndef __intptr_t_defined
  225. typedef __intptr_t intptr_t;
  226. # define __intptr_t_defined
  227. # endif
  228. #endif
  229. #if defined __USE_BSD || defined __USE_XOPEN
  230. # ifndef __socklen_t_defined
  231. typedef __socklen_t socklen_t;
  232. # define __socklen_t_defined
  233. # endif
  234. #endif
  235. /* Values for the second argument to access.
  236. These may be OR'd together. */
  237. #define R_OK 4 /* Test for read permission. */
  238. #define W_OK 2 /* Test for write permission. */
  239. #define X_OK 1 /* Test for execute permission. */
  240. #define F_OK 0 /* Test for existence. */
  241. /* Test for access to NAME using the real UID and real GID. */
  242. extern int access (const char *__name, int __type) __THROW __nonnull ((1));
  243. #if defined __UCLIBC_LINUX_SPECIFIC__ && defined __USE_GNU
  244. /* Test for access to NAME using the effective UID and GID
  245. (as normal file operations use). */
  246. extern int euidaccess (const char *__name, int __type)
  247. __THROW __nonnull ((1));
  248. /* An alias for `euidaccess', used by some other systems. */
  249. extern int eaccess (const char *__name, int __type)
  250. __THROW __nonnull ((1));
  251. #endif
  252. #ifdef __USE_ATFILE
  253. /* Test for access to FILE relative to the directory FD is open on.
  254. If AT_EACCESS is set in FLAG, then use effective IDs like `eaccess',
  255. otherwise use real IDs like `access'. */
  256. extern int faccessat (int __fd, const char *__file, int __type, int __flag)
  257. __THROW __nonnull ((2)) __wur;
  258. libc_hidden_proto(faccessat)
  259. #endif /* Use GNU. */
  260. /* Values for the WHENCE argument to lseek. */
  261. #ifndef _STDIO_H /* <stdio.h> has the same definitions. */
  262. # define SEEK_SET 0 /* Seek from beginning of file. */
  263. # define SEEK_CUR 1 /* Seek from current position. */
  264. # define SEEK_END 2 /* Seek from end of file. */
  265. #endif
  266. #if defined __USE_BSD && !defined L_SET
  267. /* Old BSD names for the same constants; just for compatibility. */
  268. # define L_SET SEEK_SET
  269. # define L_INCR SEEK_CUR
  270. # define L_XTND SEEK_END
  271. #endif
  272. /* Move FD's file position to OFFSET bytes from the
  273. beginning of the file (if WHENCE is SEEK_SET),
  274. the current position (if WHENCE is SEEK_CUR),
  275. or the end of the file (if WHENCE is SEEK_END).
  276. Return the new file position. */
  277. #ifndef __USE_FILE_OFFSET64
  278. extern __off_t lseek (int __fd, __off_t __offset, int __whence) __THROW;
  279. # ifdef _LIBC
  280. extern __typeof(lseek) __lseek_nocancel attribute_hidden;
  281. libc_hidden_proto(lseek)
  282. # endif
  283. #else
  284. # ifdef __REDIRECT_NTH
  285. extern __off64_t __REDIRECT_NTH (lseek,
  286. (int __fd, __off64_t __offset, int __whence),
  287. lseek64);
  288. # else
  289. # define lseek lseek64
  290. # endif
  291. #endif
  292. #ifdef __USE_LARGEFILE64
  293. extern __off64_t lseek64 (int __fd, __off64_t __offset, int __whence)
  294. __THROW;
  295. # ifdef _LIBC
  296. extern __typeof(lseek64) __lseek64_nocancel attribute_hidden;
  297. libc_hidden_proto(lseek64)
  298. # endif
  299. #endif
  300. /* Close the file descriptor FD.
  301. This function is a cancellation point and therefore not marked with
  302. __THROW. */
  303. extern int close (int __fd);
  304. #ifdef _LIBC
  305. extern __typeof(close) __close_nocancel attribute_hidden;
  306. extern void __close_nocancel_no_status(int) attribute_hidden;
  307. libc_hidden_proto(close)
  308. #endif
  309. /* Read NBYTES into BUF from FD. Return the
  310. number read, -1 for errors or 0 for EOF.
  311. This function is a cancellation point and therefore not marked with
  312. __THROW. */
  313. extern ssize_t read (int __fd, void *__buf, size_t __nbytes) __wur;
  314. #ifdef _LIBC
  315. extern __typeof(read) __read_nocancel attribute_hidden;
  316. libc_hidden_proto(read)
  317. #endif
  318. /* Write N bytes of BUF to FD. Return the number written, or -1.
  319. This function is a cancellation point and therefore not marked with
  320. __THROW. */
  321. extern ssize_t write (int __fd, const void *__buf, size_t __n) __wur;
  322. #ifdef _LIBC
  323. extern __typeof(write) __write_nocancel attribute_hidden;
  324. libc_hidden_proto(write)
  325. #endif
  326. #if defined __USE_UNIX98 || defined __USE_XOPEN2K8
  327. # ifndef __USE_FILE_OFFSET64
  328. /* Read NBYTES into BUF from FD at the given position OFFSET without
  329. changing the file pointer. Return the number read, -1 for errors
  330. or 0 for EOF.
  331. This function is a cancellation point and therefore not marked with
  332. __THROW. */
  333. extern ssize_t pread (int __fd, void *__buf, size_t __nbytes,
  334. __off_t __offset) __wur;
  335. /* Write N bytes of BUF to FD at the given position OFFSET without
  336. changing the file pointer. Return the number written, or -1.
  337. This function is a cancellation point and therefore not marked with
  338. __THROW. */
  339. extern ssize_t pwrite (int __fd, const void *__buf, size_t __n,
  340. __off_t __offset) __wur;
  341. # else
  342. # ifdef __REDIRECT
  343. extern ssize_t __REDIRECT (pread, (int __fd, void *__buf, size_t __nbytes,
  344. __off64_t __offset),
  345. pread64) __wur;
  346. extern ssize_t __REDIRECT (pwrite, (int __fd, const void *__buf,
  347. size_t __nbytes, __off64_t __offset),
  348. pwrite64) __wur;
  349. # else
  350. # define pread pread64
  351. # define pwrite pwrite64
  352. # endif
  353. # endif
  354. # ifdef __USE_LARGEFILE64
  355. /* Read NBYTES into BUF from FD at the given position OFFSET without
  356. changing the file pointer. Return the number read, -1 for errors
  357. or 0 for EOF. */
  358. extern ssize_t pread64 (int __fd, void *__buf, size_t __nbytes,
  359. __off64_t __offset) __wur;
  360. /* Write N bytes of BUF to FD at the given position OFFSET without
  361. changing the file pointer. Return the number written, or -1. */
  362. extern ssize_t pwrite64 (int __fd, const void *__buf, size_t __n,
  363. __off64_t __offset) __wur;
  364. # endif
  365. #endif
  366. /* Create a one-way communication channel (pipe).
  367. If successful, two file descriptors are stored in PIPEDES;
  368. bytes written on PIPEDES[1] can be read from PIPEDES[0].
  369. Returns 0 if successful, -1 if not. */
  370. extern int pipe (int __pipedes[2]) __THROW __wur;
  371. libc_hidden_proto(pipe)
  372. #if defined __UCLIBC_LINUX_SPECIFIC__ && defined __USE_GNU
  373. /* Same as pipe but apply flags passed in FLAGS to the new file
  374. descriptors. */
  375. extern int pipe2 (int __pipedes[2], int __flags) __THROW __wur;
  376. libc_hidden_proto(pipe2)
  377. #endif
  378. /* Schedule an alarm. In SECONDS seconds, the process will get a SIGALRM.
  379. If SECONDS is zero, any currently scheduled alarm will be cancelled.
  380. The function returns the number of seconds remaining until the last
  381. alarm scheduled would have signaled, or zero if there wasn't one.
  382. There is no return value to indicate an error, but you can set `errno'
  383. to 0 and check its value after calling `alarm', and this might tell you.
  384. The signal may come late due to processor scheduling. */
  385. extern unsigned int alarm (unsigned int __seconds) __THROW;
  386. libc_hidden_proto(alarm)
  387. /* Make the process sleep for SECONDS seconds, or until a signal arrives
  388. and is not ignored. The function returns the number of seconds less
  389. than SECONDS which it actually slept (thus zero if it slept the full time).
  390. If a signal handler does a `longjmp' or modifies the handling of the
  391. SIGALRM signal while inside `sleep' call, the handling of the SIGALRM
  392. signal afterwards is undefined. There is no return value to indicate
  393. error, but if `sleep' returns SECONDS, it probably didn't work.
  394. This function is a cancellation point and therefore not marked with
  395. __THROW. */
  396. extern unsigned int sleep (unsigned int __seconds);
  397. libc_hidden_proto(sleep)
  398. #if (defined __USE_BSD \
  399. || (defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K8) \
  400. ) && defined __UCLIBC_SUSV3_LEGACY__
  401. /* Set an alarm to go off (generating a SIGALRM signal) in VALUE
  402. microseconds. If INTERVAL is nonzero, when the alarm goes off, the
  403. timer is reset to go off every INTERVAL microseconds thereafter.
  404. Returns the number of microseconds remaining before the alarm. */
  405. extern __useconds_t ualarm (__useconds_t __value, __useconds_t __interval)
  406. __THROW;
  407. /* Sleep USECONDS microseconds, or until a signal arrives that is not blocked
  408. or ignored.
  409. This function is a cancellation point and therefore not marked with
  410. __THROW. */
  411. extern int usleep (__useconds_t __useconds);
  412. #endif
  413. /* Suspend the process until a signal arrives.
  414. This always returns -1 and sets `errno' to EINTR.
  415. This function is a cancellation point and therefore not marked with
  416. __THROW. */
  417. extern int pause (void);
  418. /* Change the owner and group of FILE. */
  419. extern int chown (const char *__file, __uid_t __owner, __gid_t __group)
  420. __THROW __nonnull ((1)) __wur;
  421. libc_hidden_proto(chown)
  422. #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8
  423. /* Change the owner and group of the file that FD is open on. */
  424. extern int fchown (int __fd, __uid_t __owner, __gid_t __group) __THROW __wur;
  425. /* Change owner and group of FILE, if it is a symbolic
  426. link the ownership of the symbolic link is changed. */
  427. extern int lchown (const char *__file, __uid_t __owner, __gid_t __group)
  428. __THROW __nonnull ((1)) __wur;
  429. #endif /* Use BSD || X/Open Unix. */
  430. #ifdef __USE_ATFILE
  431. /* Change the owner and group of FILE relative to the directory FD is open
  432. on. */
  433. extern int fchownat (int __fd, const char *__file, __uid_t __owner,
  434. __gid_t __group, int __flag)
  435. __THROW __nonnull ((2)) __wur;
  436. libc_hidden_proto(fchownat)
  437. #endif /* Use GNU. */
  438. /* Change the process's working directory to PATH. */
  439. extern int chdir (const char *__path) __THROW __nonnull ((1)) __wur;
  440. libc_hidden_proto(chdir)
  441. #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8
  442. /* Change the process's working directory to the one FD is open on. */
  443. extern int fchdir (int __fd) __THROW __wur;
  444. libc_hidden_proto(fchdir)
  445. #endif
  446. /* Get the pathname of the current working directory,
  447. and put it in SIZE bytes of BUF. Returns NULL if the
  448. directory couldn't be determined or SIZE was too small.
  449. If successful, returns BUF. In GNU, if BUF is NULL,
  450. an array is allocated with `malloc'; the array is SIZE
  451. bytes long, unless SIZE == 0, in which case it is as
  452. big as necessary. */
  453. extern char *getcwd (char *__buf, size_t __size) __THROW __wur;
  454. libc_hidden_proto(getcwd)
  455. #ifdef __USE_GNU
  456. /* Return a malloc'd string containing the current directory name.
  457. If the environment variable `PWD' is set, and its value is correct,
  458. that value is used. */
  459. extern char *get_current_dir_name (void) __THROW;
  460. #endif
  461. #if 0 /*defined __USE_BSD || (defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K8)*/
  462. /* Put the absolute pathname of the current working directory in BUF.
  463. If successful, return BUF. If not, put an error message in
  464. BUF and return NULL. BUF should be at least PATH_MAX bytes long. */
  465. extern char *getwd (char *__buf)
  466. __THROW __nonnull ((1)) __attribute_deprecated__ __wur;
  467. #endif
  468. /* Duplicate FD, returning a new file descriptor on the same file. */
  469. extern int dup (int __fd) __THROW __wur;
  470. /* Duplicate FD to FD2, closing FD2 and making it open on the same file. */
  471. extern int dup2 (int __fd, int __fd2) __THROW;
  472. libc_hidden_proto(dup2)
  473. #ifdef __USE_GNU
  474. /* Duplicate FD to FD2, closing FD2 and making it open on the same
  475. file while setting flags according to FLAGS. */
  476. extern int dup3 (int __fd, int __fd2, int __flags) __THROW;
  477. libc_hidden_proto(dup3)
  478. #endif
  479. /* NULL-terminated array of "NAME=VALUE" environment variables. */
  480. extern char **__environ;
  481. #ifdef __USE_GNU
  482. extern char **environ;
  483. #endif
  484. /* Replace the current process, executing PATH with arguments ARGV and
  485. environment ENVP. ARGV and ENVP are terminated by NULL pointers. */
  486. extern int execve (const char *__path, char *const __argv[],
  487. char *const __envp[]) __THROW __nonnull ((1, 2));
  488. libc_hidden_proto(execve)
  489. /* Execute the file FD refers to, overlaying the running program image.
  490. ARGV and ENVP are passed to the new program, as for `execve'. */
  491. extern int fexecve (int __fd, char *const __argv[], char *const __envp[])
  492. __THROW __nonnull ((2));
  493. libc_hidden_proto(fexecve)
  494. /* Execute PATH with arguments ARGV and environment from `environ'. */
  495. extern int execv (const char *__path, char *const __argv[])
  496. __THROW __nonnull ((1, 2));
  497. libc_hidden_proto(execv)
  498. /* Execute PATH with all arguments after PATH until a NULL pointer,
  499. and the argument after that for environment. */
  500. extern int execle (const char *__path, const char *__arg, ...)
  501. __THROW __nonnull ((1, 2));
  502. libc_hidden_proto(execle)
  503. /* Execute PATH with all arguments after PATH until
  504. a NULL pointer and environment from `environ'. */
  505. extern int execl (const char *__path, const char *__arg, ...)
  506. __THROW __nonnull ((1, 2));
  507. libc_hidden_proto(execl)
  508. /* Execute FILE, searching in the `PATH' environment variable if it contains
  509. no slashes, with arguments ARGV and environment from `environ'. */
  510. extern int execvp (const char *__file, char *const __argv[])
  511. __THROW __nonnull ((1, 2));
  512. libc_hidden_proto(execvp)
  513. /* Execute FILE, searching in the `PATH' environment variable if
  514. it contains no slashes, with all arguments after FILE until a
  515. NULL pointer and environment from `environ'. */
  516. extern int execlp (const char *__file, const char *__arg, ...)
  517. __THROW __nonnull ((1, 2));
  518. libc_hidden_proto(execlp)
  519. #ifdef __USE_GNU
  520. /* Execute FILE, searching in the `PATH' environment variable if it contains
  521. no slashes, with arguments ARGV and environment from a pointer */
  522. extern int execvpe (const char *__file, char *const __argv[],
  523. char *const __envp[])
  524. __THROW __nonnull ((1, 2));
  525. libc_hidden_proto(execvpe)
  526. #endif
  527. #if defined __USE_MISC || defined __USE_XOPEN
  528. /* Add INC to priority of the current process. */
  529. extern int nice (int __inc) __THROW __wur;
  530. #endif
  531. /* Terminate program execution with the low-order 8 bits of STATUS. */
  532. extern void _exit (int __status) __attribute__ ((__noreturn__));
  533. libc_hidden_proto(_exit)
  534. /* Get the `_PC_*' symbols for the NAME argument to `pathconf' and `fpathconf';
  535. the `_SC_*' symbols for the NAME argument to `sysconf';
  536. and the `_CS_*' symbols for the NAME argument to `confstr'. */
  537. #include <bits/confname.h>
  538. /* Get file-specific configuration information about PATH. */
  539. extern long int pathconf (const char *__path, int __name)
  540. __THROW __nonnull ((1));
  541. /* Get file-specific configuration about descriptor FD. */
  542. extern long int fpathconf (int __fd, int __name) __THROW;
  543. /* Get the value of the system variable NAME. */
  544. extern long int sysconf (int __name) __THROW;
  545. libc_hidden_proto(sysconf)
  546. #ifdef __USE_POSIX2
  547. /* Get the value of the string-valued system variable NAME. */
  548. extern size_t confstr (int __name, char *__buf, size_t __len) __THROW;
  549. #endif
  550. /* Get the process ID of the calling process. */
  551. extern __pid_t getpid (void) __THROW;
  552. libc_hidden_proto(getpid)
  553. /* Get the process ID of the calling process's parent. */
  554. extern __pid_t getppid (void) __THROW;
  555. /* Get the process group ID of the calling process. */
  556. extern __pid_t getpgrp (void) __THROW;
  557. /* Get the process group ID of process PID. */
  558. extern __pid_t __getpgid (__pid_t __pid) __THROW;
  559. #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8
  560. extern __pid_t getpgid (__pid_t __pid) __THROW;
  561. #endif
  562. /* Set the process group ID of the process matching PID to PGID.
  563. If PID is zero, the current process's process group ID is set.
  564. If PGID is zero, the process ID of the process is used. */
  565. extern int setpgid (__pid_t __pid, __pid_t __pgid) __THROW;
  566. libc_hidden_proto(setpgid)
  567. #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED
  568. /* Both System V and BSD have `setpgrp' functions, but with different
  569. calling conventions. The BSD function is the same as POSIX.1 `setpgid'
  570. (above). The System V function takes no arguments and puts the calling
  571. process in its on group like `setpgid (0, 0)'.
  572. New programs should always use `setpgid' instead.
  573. GNU provides the POSIX.1 function. */
  574. /* Set the process group ID of the calling process to its own PID.
  575. This is exactly the same as `setpgid (0, 0)'. */
  576. extern int setpgrp (void) __THROW;
  577. #endif /* Use misc or X/Open. */
  578. /* Create a new session with the calling process as its leader.
  579. The process group IDs of the session and the calling process
  580. are set to the process ID of the calling process, which is returned. */
  581. extern __pid_t setsid (void) __THROW;
  582. libc_hidden_proto(setsid)
  583. #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8
  584. /* Return the session ID of the given process. */
  585. extern __pid_t getsid (__pid_t __pid) __THROW;
  586. libc_hidden_proto(getsid)
  587. #endif
  588. /* Get the real user ID of the calling process. */
  589. extern __uid_t getuid (void) __THROW;
  590. libc_hidden_proto(getuid)
  591. /* Get the effective user ID of the calling process. */
  592. extern __uid_t geteuid (void) __THROW;
  593. libc_hidden_proto(geteuid)
  594. /* Get the real group ID of the calling process. */
  595. extern __gid_t getgid (void) __THROW;
  596. libc_hidden_proto(getgid)
  597. /* Get the effective group ID of the calling process. */
  598. extern __gid_t getegid (void) __THROW;
  599. libc_hidden_proto(getegid)
  600. /* If SIZE is zero, return the number of supplementary groups
  601. the calling process is in. Otherwise, fill in the group IDs
  602. of its supplementary groups in LIST and return the number written. */
  603. extern int getgroups (int __size, __gid_t __list[]) __THROW __wur;
  604. libc_hidden_proto(getgroups)
  605. #if 0 /*def __USE_GNU*/
  606. /* Return nonzero iff the calling process is in group GID. */
  607. extern int group_member (__gid_t __gid) __THROW;
  608. #endif
  609. /* Set the user ID of the calling process to UID.
  610. If the calling process is the super-user, set the real
  611. and effective user IDs, and the saved set-user-ID to UID;
  612. if not, the effective user ID is set to UID. */
  613. extern int setuid (__uid_t __uid) __THROW __wur;
  614. #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
  615. /* Set the real user ID of the calling process to RUID,
  616. and the effective user ID of the calling process to EUID. */
  617. extern int setreuid (__uid_t __ruid, __uid_t __euid) __THROW __wur;
  618. libc_hidden_proto(setreuid)
  619. #endif
  620. #if defined __USE_BSD || defined __USE_XOPEN2K
  621. /* Set the effective user ID of the calling process to UID. */
  622. extern int seteuid (__uid_t __uid) __THROW __wur;
  623. libc_hidden_proto(seteuid)
  624. #endif
  625. /* Set the group ID of the calling process to GID.
  626. If the calling process is the super-user, set the real
  627. and effective group IDs, and the saved set-group-ID to GID;
  628. if not, the effective group ID is set to GID. */
  629. extern int setgid (__gid_t __gid) __THROW __wur;
  630. #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
  631. /* Set the real group ID of the calling process to RGID,
  632. and the effective group ID of the calling process to EGID. */
  633. extern int setregid (__gid_t __rgid, __gid_t __egid) __THROW __wur;
  634. libc_hidden_proto(setregid)
  635. #endif
  636. #if defined __USE_BSD || defined __USE_XOPEN2K
  637. /* Set the effective group ID of the calling process to GID. */
  638. extern int setegid (__gid_t __gid) __THROW __wur;
  639. #endif /* Use BSD. */
  640. #ifdef __USE_GNU
  641. /* Fetch the real user ID, effective user ID, and saved-set user ID,
  642. of the calling process. */
  643. extern int getresuid (__uid_t *__ruid, __uid_t *__euid, __uid_t *__suid)
  644. __THROW;
  645. /* Fetch the real group ID, effective group ID, and saved-set group ID,
  646. of the calling process. */
  647. extern int getresgid (__gid_t *__rgid, __gid_t *__egid, __gid_t *__sgid)
  648. __THROW;
  649. #if defined __UCLIBC_LINUX_SPECIFIC__
  650. /* Set the real user ID, effective user ID, and saved-set user ID,
  651. of the calling process to RUID, EUID, and SUID, respectively. */
  652. extern int setresuid (__uid_t __ruid, __uid_t __euid, __uid_t __suid)
  653. __THROW __wur;
  654. libc_hidden_proto(setresuid)
  655. #endif
  656. /* Set the real group ID, effective group ID, and saved-set group ID,
  657. of the calling process to RGID, EGID, and SGID, respectively. */
  658. extern int setresgid (__gid_t __rgid, __gid_t __egid, __gid_t __sgid)
  659. __THROW __wur;
  660. libc_hidden_proto(setresgid)
  661. #endif
  662. #if defined __UCLIBC_HAS_STUBS__ || defined __ARCH_USE_MMU__
  663. /* Clone the calling process, creating an exact copy.
  664. Return -1 for errors, 0 to the new process,
  665. and the process ID of the new process to the old process. */
  666. extern __pid_t fork (void) __THROWNL;
  667. # ifdef _LIBC
  668. # ifdef __UCLIBC_HAS_THREADS__
  669. extern __typeof(fork) __libc_fork;
  670. # endif
  671. libc_hidden_proto(fork)
  672. # endif
  673. #endif
  674. #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
  675. /* Clone the calling process, but without copying the whole address space.
  676. The calling process is suspended until the new process exits or is
  677. replaced by a call to `execve'. Return -1 for errors, 0 to the new process,
  678. and the process ID of the new process to the old process. */
  679. extern __pid_t vfork (void) __THROW;
  680. libc_hidden_proto(vfork)
  681. #endif /* Use BSD. */
  682. /* Return the pathname of the terminal FD is open on, or NULL on errors.
  683. The returned storage is good only until the next call to this function. */
  684. extern char *ttyname (int __fd) __THROW;
  685. /* Store at most BUFLEN characters of the pathname of the terminal FD is
  686. open on in BUF. Return 0 on success, otherwise an error number. */
  687. extern int ttyname_r (int __fd, char *__buf, size_t __buflen)
  688. __THROW __nonnull ((2)) __wur;
  689. libc_hidden_proto(ttyname_r)
  690. /* Return 1 if FD is a valid descriptor associated
  691. with a terminal, zero if not. */
  692. extern int isatty (int __fd) __THROW;
  693. libc_hidden_proto(isatty)
  694. #if 0 /*defined __USE_BSD \
  695. || (defined __USE_XOPEN_EXTENDED && !defined __USE_UNIX98)*/
  696. /* Return the index into the active-logins file (utmp) for
  697. the controlling terminal. */
  698. extern int ttyslot (void) __THROW;
  699. #endif
  700. /* Make a link to FROM named TO. */
  701. extern int link (const char *__from, const char *__to)
  702. __THROW __nonnull ((1, 2)) __wur;
  703. #ifdef __USE_ATFILE
  704. /* Like link but relative paths in TO and FROM are interpreted relative
  705. to FROMFD and TOFD respectively. */
  706. extern int linkat (int __fromfd, const char *__from, int __tofd,
  707. const char *__to, int __flags)
  708. __THROW __nonnull ((2, 4)) __wur;
  709. libc_hidden_proto(linkat)
  710. #endif
  711. #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K
  712. /* Make a symbolic link to FROM named TO. */
  713. extern int symlink (const char *__from, const char *__to)
  714. __THROW __nonnull ((1, 2)) __wur;
  715. /* Read the contents of the symbolic link PATH into no more than
  716. LEN bytes of BUF. The contents are not null-terminated.
  717. Returns the number of characters read, or -1 for errors. */
  718. extern ssize_t readlink (const char *__restrict __path,
  719. char *__restrict __buf, size_t __len)
  720. __THROW __nonnull ((1, 2)) __wur;
  721. libc_hidden_proto(readlink)
  722. #endif /* Use POSIX.1-2001. */
  723. #ifdef __USE_ATFILE
  724. /* Like symlink but a relative path in TO is interpreted relative to TOFD. */
  725. extern int symlinkat (const char *__from, int __tofd,
  726. const char *__to) __THROW __nonnull ((1, 3)) __wur;
  727. libc_hidden_proto(symlinkat)
  728. /* Like readlink but a relative PATH is interpreted relative to FD. */
  729. extern ssize_t readlinkat (int __fd, const char *__restrict __path,
  730. char *__restrict __buf, size_t __len)
  731. __THROW __nonnull ((2, 3)) __wur;
  732. libc_hidden_proto(readlinkat)
  733. #endif
  734. /* Remove the link NAME. */
  735. extern int unlink (const char *__name) __THROW __nonnull ((1));
  736. libc_hidden_proto(unlink)
  737. #ifdef __USE_ATFILE
  738. /* Remove the link NAME relative to FD. */
  739. extern int unlinkat (int __fd, const char *__name, int __flag)
  740. __THROW __nonnull ((2));
  741. libc_hidden_proto(unlinkat)
  742. #endif
  743. /* Remove the directory PATH. */
  744. extern int rmdir (const char *__path) __THROW __nonnull ((1));
  745. libc_hidden_proto(rmdir)
  746. /* Return the foreground process group ID of FD. */
  747. extern __pid_t tcgetpgrp (int __fd) __THROW;
  748. libc_hidden_proto(tcgetpgrp)
  749. /* Set the foreground process group ID of FD set PGRP_ID. */
  750. extern int tcsetpgrp (int __fd, __pid_t __pgrp_id) __THROW;
  751. /* Return the login name of the user.
  752. This function is a possible cancellation point and therefore not
  753. marked with __THROW. */
  754. extern char *getlogin (void);
  755. libc_hidden_proto(getlogin)
  756. #if defined __USE_REENTRANT || defined __USE_POSIX199506
  757. /* Return at most NAME_LEN characters of the login name of the user in NAME.
  758. If it cannot be determined or some other error occurred, return the error
  759. code. Otherwise return 0.
  760. This function is a possible cancellation point and therefore not
  761. marked with __THROW. */
  762. extern int getlogin_r (char *__name, size_t __name_len) __nonnull ((1));
  763. #endif
  764. #if 0 /*def __USE_BSD*/
  765. /* Set the login name returned by `getlogin'. */
  766. extern int setlogin (const char *__name) __THROW __nonnull ((1));
  767. #endif
  768. #ifdef __USE_POSIX2
  769. /* Get definitions and prototypes for functions to process the
  770. arguments in ARGV (ARGC of them, minus the program name) for
  771. options given in OPTS. */
  772. # define __need_getopt
  773. /* keep this for uClibc in bits/, we need it when GNU_GETOPT is disabled */
  774. # include <bits/getopt.h>
  775. #endif
  776. #if defined __USE_BSD || defined __USE_UNIX98 || defined __USE_XOPEN2K
  777. /* Put the name of the current host in no more than LEN bytes of NAME.
  778. The result is null-terminated if LEN is large enough for the full
  779. name and the terminator. */
  780. extern int gethostname (char *__name, size_t __len) __THROW __nonnull ((1));
  781. libc_hidden_proto(gethostname)
  782. #endif
  783. #if defined __USE_BSD || (defined __USE_XOPEN && !defined __USE_UNIX98)
  784. /* Set the name of the current host to NAME, which is LEN bytes long.
  785. This call is restricted to the super-user. */
  786. extern int sethostname (const char *__name, size_t __len)
  787. __THROW __nonnull ((1)) __wur;
  788. /* Set the current machine's Internet number to ID.
  789. This call is restricted to the super-user. */
  790. extern int sethostid (long int __id) __THROW __wur;
  791. #if defined __UCLIBC_BSD_SPECIFIC__ || defined _LIBC
  792. /* Get and set the NIS (aka YP) domain name, if any.
  793. Called just like `gethostname' and `sethostname'.
  794. The NIS domain name is usually the empty string when not using NIS. */
  795. extern int getdomainname (char *__name, size_t __len)
  796. __THROW __nonnull ((1)) __wur;
  797. libc_hidden_proto(getdomainname)
  798. #endif
  799. #if defined __UCLIBC_BSD_SPECIFIC__
  800. extern int setdomainname (const char *__name, size_t __len)
  801. __THROW __nonnull ((1)) __wur;
  802. #endif
  803. #if defined __UCLIBC_LINUX_SPECIFIC__
  804. /* Revoke access permissions to all processes currently communicating
  805. with the control terminal, and then send a SIGHUP signal to the process
  806. group of the control terminal. */
  807. extern int vhangup (void) __THROW;
  808. #endif
  809. #if 0
  810. /* Revoke the access of all descriptors currently open on FILE. */
  811. extern int revoke (const char *__file) __THROW __nonnull ((1)) __wur;
  812. /* Enable statistical profiling, writing samples of the PC into at most
  813. SIZE bytes of SAMPLE_BUFFER; every processor clock tick while profiling
  814. is enabled, the system examines the user PC and increments
  815. SAMPLE_BUFFER[((PC - OFFSET) / 2) * SCALE / 65536]. If SCALE is zero,
  816. disable profiling. Returns zero on success, -1 on error. */
  817. extern int profil (unsigned short int *__sample_buffer, size_t __size,
  818. size_t __offset, unsigned int __scale)
  819. __THROW __nonnull ((1));
  820. #endif
  821. /* Turn accounting on if NAME is an existing file. The system will then write
  822. a record for each process as it terminates, to this file. If NAME is NULL,
  823. turn accounting off. This call is restricted to the super-user. */
  824. extern int acct (const char *__name) __THROW;
  825. /* Successive calls return the shells listed in `/etc/shells'. */
  826. extern char *getusershell (void) __THROW;
  827. extern void endusershell (void) __THROW; /* Discard cached info. */
  828. libc_hidden_proto(endusershell)
  829. extern void setusershell (void) __THROW; /* Rewind and re-read the file. */
  830. libc_hidden_proto(setusershell)
  831. /* Put the program in the background, and dissociate from the controlling
  832. terminal. If NOCHDIR is zero, do `chdir ("/")'. If NOCLOSE is zero,
  833. redirects stdin, stdout, and stderr to /dev/null. */
  834. extern int daemon (int __nochdir, int __noclose) __THROW __wur;
  835. #endif /* Use BSD || X/Open. */
  836. #if defined __USE_BSD || (defined __USE_XOPEN && !defined __USE_XOPEN2K)
  837. /* Make PATH be the root directory (the starting point for absolute paths).
  838. This call is restricted to the super-user. */
  839. extern int chroot (const char *__path) __THROW __nonnull ((1)) __wur;
  840. /* Prompt with PROMPT and read a string from the terminal without echoing.
  841. Uses /dev/tty if possible; otherwise stderr and stdin. */
  842. extern char *getpass (const char *__prompt) __nonnull ((1));
  843. #endif /* Use BSD || X/Open. */
  844. #if defined __USE_BSD || defined __USE_XOPEN || defined __USE_XOPEN2K
  845. /* Make all changes done to FD actually appear on disk.
  846. This function is a cancellation point and therefore not marked with
  847. __THROW. */
  848. extern int fsync (int __fd);
  849. #endif /* Use BSD || X/Open || Unix98. */
  850. #if defined __USE_GNU
  851. /* Make all changes done to all files on the file system associated
  852. * with FD actually appear on disk. */
  853. extern int syncfs (int __fd) __THROW;
  854. #endif
  855. #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
  856. /* Return identifier for the current host. */
  857. extern long int gethostid (void);
  858. /* Make all changes done to all files actually appear on disk. */
  859. extern void sync (void) __THROW;
  860. /* Return the number of bytes in a page. This is the system's page size,
  861. which is not necessarily the same as the hardware page size. */
  862. extern int getpagesize (void) __THROW __attribute__ ((__const__));
  863. libc_hidden_proto(getpagesize)
  864. /* Return the maximum number of file descriptors
  865. the current process could possibly have. */
  866. extern int getdtablesize (void) __THROW;
  867. libc_hidden_proto(getdtablesize)
  868. /* Truncate FILE to LENGTH bytes. */
  869. # ifndef __USE_FILE_OFFSET64
  870. extern int truncate (const char *__file, __off_t __length)
  871. __THROW __nonnull ((1)) __wur;
  872. libc_hidden_proto(truncate)
  873. # else
  874. # ifdef __REDIRECT_NTH
  875. extern int __REDIRECT_NTH (truncate,
  876. (const char *__file, __off64_t __length),
  877. truncate64) __nonnull ((1)) __wur;
  878. # else
  879. # define truncate truncate64
  880. # endif
  881. # endif
  882. # ifdef __USE_LARGEFILE64
  883. extern int truncate64 (const char *__file, __off64_t __length)
  884. __THROW __nonnull ((1)) __wur;
  885. libc_hidden_proto(truncate64)
  886. # endif
  887. #endif /* Use BSD || X/Open Unix. */
  888. #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K
  889. /* Truncate the file FD is open on to LENGTH bytes. */
  890. # ifndef __USE_FILE_OFFSET64
  891. extern int ftruncate (int __fd, __off_t __length) __THROW __wur;
  892. libc_hidden_proto(ftruncate)
  893. # else
  894. # ifdef __REDIRECT_NTH
  895. extern int __REDIRECT_NTH (ftruncate, (int __fd, __off64_t __length),
  896. ftruncate64) __wur;
  897. # else
  898. # define ftruncate ftruncate64
  899. # endif
  900. # endif
  901. # ifdef __USE_LARGEFILE64
  902. extern int ftruncate64 (int __fd, __off64_t __length) __THROW __wur;
  903. libc_hidden_proto(ftruncate64)
  904. # endif
  905. #endif /* Use BSD || X/Open Unix || POSIX 2003. */
  906. #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED
  907. /* Set the end of accessible data space (aka "the break") to ADDR.
  908. Returns zero on success and -1 for errors (with errno set). */
  909. extern int brk (void *__addr) __THROW __wur;
  910. libc_hidden_proto(brk)
  911. /* Increase or decrease the end of accessible data space by DELTA bytes.
  912. If successful, returns the address the previous end of data space
  913. (i.e. the beginning of the new space, if DELTA > 0);
  914. returns (void *) -1 for errors (with errno set). */
  915. extern void *sbrk (intptr_t __delta) __THROW;
  916. libc_hidden_proto(sbrk)
  917. #endif
  918. #ifdef __USE_MISC
  919. /* Invoke `system call' number SYSNO, passing it the remaining arguments.
  920. This is completely system-dependent, and not often useful.
  921. In Unix, `syscall' sets `errno' for all errors and most calls return -1
  922. for errors; in many systems you cannot pass arguments or get return
  923. values for all system calls (`pipe', `fork', and `getppid' typically
  924. among them).
  925. In Mach, all system calls take normal arguments and always return an
  926. error code (zero for success). */
  927. extern long int syscall (long int __sysno, ...) __THROW;
  928. #endif /* Use misc. */
  929. /* Are we in a secure process environment or are we dealing with setuid
  930. * stuff? This value is returned by issetugid().
  931. */
  932. extern int _pe_secure;
  933. libc_hidden_proto(_pe_secure)
  934. #ifdef __USE_BSD
  935. /* issetugid() returns 1 if the process environment or memory address space
  936. is considered tainted, and returns 0 otherwise. This happens, for example,
  937. when a process's privileges are elevated by the setuid or setgid flags on
  938. an executable belonging to root.
  939. */
  940. extern int issetugid(void);
  941. #endif
  942. #if (defined __USE_MISC || defined __USE_XOPEN_EXTENDED) && !defined F_LOCK
  943. /* NOTE: These declarations also appear in <fcntl.h>; be sure to keep both
  944. files consistent. Some systems have them there and some here, and some
  945. software depends on the macros being defined without including both. */
  946. /* `lockf' is a simpler interface to the locking facilities of `fcntl'.
  947. LEN is always relative to the current file position.
  948. The CMD argument is one of the following.
  949. This function is a cancellation point and therefore not marked with
  950. __THROW. */
  951. # define F_ULOCK 0 /* Unlock a previously locked region. */
  952. # define F_LOCK 1 /* Lock a region for exclusive use. */
  953. # define F_TLOCK 2 /* Test and lock a region for exclusive use. */
  954. # define F_TEST 3 /* Test a region for other processes locks. */
  955. # ifndef __USE_FILE_OFFSET64
  956. extern int lockf (int __fd, int __cmd, __off_t __len) __wur;
  957. libc_hidden_proto(lockf)
  958. # else
  959. # ifdef __REDIRECT
  960. extern int __REDIRECT (lockf, (int __fd, int __cmd, __off64_t __len),
  961. lockf64) __wur;
  962. # else
  963. # define lockf lockf64
  964. # endif
  965. # endif
  966. # ifdef __USE_LARGEFILE64
  967. extern int lockf64 (int __fd, int __cmd, __off64_t __len) __wur;
  968. # endif
  969. #endif /* Use misc and F_LOCK not already defined. */
  970. #ifdef __USE_GNU
  971. /* Evaluate EXPRESSION, and repeat as long as it returns -1 with `errno'
  972. set to EINTR. */
  973. # define TEMP_FAILURE_RETRY(expression) \
  974. (__extension__ \
  975. ({ long int __result; \
  976. do __result = (long int) (expression); \
  977. while (__result == -1L && errno == EINTR); \
  978. __result; }))
  979. #endif
  980. #if (defined __USE_POSIX199309 || defined __USE_UNIX98) \
  981. && defined __UCLIBC_HAS_REALTIME__
  982. /* Synchronize at least the data part of a file with the underlying
  983. media. */
  984. extern int fdatasync (int __fildes);
  985. #endif /* Use POSIX199309 */
  986. /* XPG4.2 specifies that prototypes for the encryption functions must
  987. be defined here. */
  988. #ifdef __USE_XOPEN
  989. # if defined __UCLIBC_HAS_CRYPT__
  990. /* Encrypt at most 8 characters from KEY using salt to perturb DES. */
  991. extern char *crypt (const char *__key, const char *__salt)
  992. __THROW __nonnull ((1, 2));
  993. /* Encrypt data in BLOCK in place if EDFLAG is zero; otherwise decrypt
  994. block in place. */
  995. extern void encrypt (char *__block, int __edflag) __THROW __nonnull ((1));
  996. # endif /* __UCLIBC_HAS_CRYPT__ */
  997. /* Swab pairs bytes in the first N bytes of the area pointed to by
  998. FROM and copy the result to TO. The value of TO must not be in the
  999. range [FROM - N + 1, FROM - 1]. If N is odd the first byte in FROM
  1000. is without partner. */
  1001. extern void swab (const void *__restrict __from, void *__restrict __to,
  1002. ssize_t __n) __THROW __nonnull ((1, 2));
  1003. #endif
  1004. /* The Single Unix specification demands this prototype to be here.
  1005. It is also found in <stdio.h>. */
  1006. #if defined __USE_XOPEN && !defined __USE_XOPEN2K
  1007. /* Return the name of the controlling terminal. */
  1008. extern char *ctermid (char *__s) __THROW;
  1009. #endif
  1010. __END_DECLS
  1011. #ifdef _LIBC
  1012. #ifndef smallint_type /* if arch didn't override it in bits/wordsize.h */
  1013. #define smallint_type int
  1014. #endif
  1015. typedef signed smallint_type smallint;
  1016. typedef unsigned smallint_type smalluint;
  1017. extern size_t __pagesize attribute_hidden;
  1018. #endif
  1019. #endif /* unistd.h */