fcntl.h 7.9 KB

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  1. /* Copyright (C) 1991,1992,1994-2001,2003,2004,2005,2006,2007, 2009
  2. Free Software Foundation, Inc.
  3. This file is part of the GNU C Library.
  4. The GNU C Library is free software; you can redistribute it and/or
  5. modify it under the terms of the GNU Lesser General Public
  6. License as published by the Free Software Foundation; either
  7. version 2.1 of the License, or (at your option) any later version.
  8. The GNU C Library is distributed in the hope that it will be useful,
  9. but WITHOUT ANY WARRANTY; without even the implied warranty of
  10. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  11. Lesser General Public License for more details.
  12. You should have received a copy of the GNU Lesser General Public
  13. License along with the GNU C Library; if not, write to the Free
  14. Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  15. 02111-1307 USA. */
  16. /*
  17. * POSIX Standard: 6.5 File Control Operations <fcntl.h>
  18. */
  19. #ifndef _FCNTL_H
  20. #define _FCNTL_H 1
  21. #include <features.h>
  22. /* This must be early so <bits/fcntl.h> can define types winningly. */
  23. __BEGIN_DECLS
  24. /* Get the definitions of O_*, F_*, FD_*: all the
  25. numbers and flag bits for `open', `fcntl', et al. */
  26. #include <bits/fcntl.h>
  27. /* For XPG all symbols from <sys/stat.h> should also be available. */
  28. #ifdef __USE_XOPEN
  29. # include <sys/stat.h>
  30. #endif
  31. #ifdef __USE_MISC
  32. # ifndef R_OK /* Verbatim from <unistd.h>. Ugh. */
  33. /* Values for the second argument to access.
  34. These may be OR'd together. */
  35. # define R_OK 4 /* Test for read permission. */
  36. # define W_OK 2 /* Test for write permission. */
  37. # define X_OK 1 /* Test for execute permission. */
  38. # define F_OK 0 /* Test for existence. */
  39. # endif
  40. #endif /* Use misc. */
  41. /* XPG wants the following symbols. */
  42. #ifdef __USE_XOPEN /* <stdio.h> has the same definitions. */
  43. # define SEEK_SET 0 /* Seek from beginning of file. */
  44. # define SEEK_CUR 1 /* Seek from current position. */
  45. # define SEEK_END 2 /* Seek from end of file. */
  46. #endif /* XPG */
  47. #ifdef __USE_ATFILE
  48. # define AT_FDCWD -100 /* Special value used to indicate
  49. the *at functions should use the
  50. current working directory. */
  51. # define AT_SYMLINK_NOFOLLOW 0x100 /* Do not follow symbolic links. */
  52. # define AT_REMOVEDIR 0x200 /* Remove directory instead of
  53. unlinking file. */
  54. # define AT_SYMLINK_FOLLOW 0x400 /* Follow symbolic links. */
  55. # define AT_EACCESS 0x200 /* Test access permitted for
  56. effective IDs, not real IDs. */
  57. #endif
  58. /* Do the file control operation described by CMD on FD.
  59. The remaining arguments are interpreted depending on CMD.
  60. This function is a cancellation point and therefore not marked with
  61. __THROW. */
  62. #if !defined(__USE_FILE_OFFSET64) || defined(__LP64__)
  63. extern int fcntl (int __fd, int __cmd, ...);
  64. libc_hidden_proto(fcntl)
  65. #else
  66. # ifdef __REDIRECT
  67. extern int __REDIRECT (fcntl, (int __fd, int __cmd, ...), fcntl64);
  68. # else
  69. # define fcntl fcntl64
  70. # endif
  71. #endif
  72. #if defined(__USE_LARGEFILE64) && !defined(__LP64__)
  73. extern int fcntl64 (int __fd, int __cmd, ...);
  74. libc_hidden_proto(fcntl64)
  75. #endif
  76. /* Open FILE and return a new file descriptor for it, or -1 on error.
  77. OFLAG determines the type of access used. If O_CREAT is on OFLAG,
  78. the third argument is taken as a `mode_t', the mode of the created file.
  79. This function is a cancellation point and therefore not marked with
  80. __THROW. */
  81. #ifndef __USE_FILE_OFFSET64
  82. extern int open (__const char *__file, int __oflag, ...) __nonnull ((1));
  83. libc_hidden_proto(open)
  84. #else
  85. # ifdef __REDIRECT
  86. extern int __REDIRECT (open, (__const char *__file, int __oflag, ...), open64)
  87. __nonnull ((1));
  88. # else
  89. # define open open64
  90. # endif
  91. #endif
  92. #ifdef __USE_LARGEFILE64
  93. extern int open64 (__const char *__file, int __oflag, ...) __nonnull ((1));
  94. libc_hidden_proto(open64)
  95. #endif
  96. #ifdef __USE_ATFILE
  97. /* Similar to `open' but a relative path name is interpreted relative to
  98. the directory for which FD is a descriptor.
  99. NOTE: some other `openat' implementation support additional functionality
  100. through this interface, especially using the O_XATTR flag. This is not
  101. yet supported here.
  102. This function is a cancellation point and therefore not marked with
  103. __THROW. */
  104. # ifndef __USE_FILE_OFFSET64
  105. extern int openat (int __fd, __const char *__file, int __oflag, ...)
  106. __nonnull ((2));
  107. libc_hidden_proto(openat)
  108. # else
  109. # ifdef __REDIRECT
  110. extern int __REDIRECT (openat, (int __fd, __const char *__file, int __oflag,
  111. ...), openat64) __nonnull ((2));
  112. # else
  113. # define openat openat64
  114. # endif
  115. # endif
  116. extern int openat64 (int __fd, __const char *__file, int __oflag, ...)
  117. __nonnull ((2));
  118. libc_hidden_proto(openat64)
  119. #endif
  120. /* Create and open FILE, with mode MODE. This takes an `int' MODE
  121. argument because that is what `mode_t' will be widened to.
  122. This function is a cancellation point and therefore not marked with
  123. __THROW. */
  124. #ifndef __USE_FILE_OFFSET64
  125. extern int creat (__const char *__file, __mode_t __mode) __nonnull ((1));
  126. #else
  127. # ifdef __REDIRECT
  128. extern int __REDIRECT (creat, (__const char *__file, __mode_t __mode),
  129. creat64) __nonnull ((1));
  130. # else
  131. # define creat creat64
  132. # endif
  133. #endif
  134. #ifdef __USE_LARGEFILE64
  135. extern int creat64 (__const char *__file, __mode_t __mode) __nonnull ((1));
  136. #endif
  137. #if !defined F_LOCK && (defined __USE_MISC || (defined __USE_XOPEN_EXTENDED \
  138. && !defined __USE_POSIX))
  139. /* NOTE: These declarations also appear in <unistd.h>; be sure to keep both
  140. files consistent. Some systems have them there and some here, and some
  141. software depends on the macros being defined without including both. */
  142. /* `lockf' is a simpler interface to the locking facilities of `fcntl'.
  143. LEN is always relative to the current file position.
  144. The CMD argument is one of the following. */
  145. # define F_ULOCK 0 /* Unlock a previously locked region. */
  146. # define F_LOCK 1 /* Lock a region for exclusive use. */
  147. # define F_TLOCK 2 /* Test and lock a region for exclusive use. */
  148. # define F_TEST 3 /* Test a region for other processes locks. */
  149. # ifndef __USE_FILE_OFFSET64
  150. extern int lockf (int __fd, int __cmd, __off_t __len);
  151. libc_hidden_proto(lockf)
  152. # else
  153. # ifdef __REDIRECT
  154. extern int __REDIRECT (lockf, (int __fd, int __cmd, __off64_t __len), lockf64);
  155. # else
  156. # define lockf lockf64
  157. # endif
  158. # endif
  159. # ifdef __USE_LARGEFILE64
  160. extern int lockf64 (int __fd, int __cmd, __off64_t __len);
  161. libc_hidden_proto(lockf64)
  162. # endif
  163. #endif
  164. #if defined __USE_XOPEN2K && defined __UCLIBC_HAS_ADVANCED_REALTIME__
  165. /* Advice the system about the expected behaviour of the application with
  166. respect to the file associated with FD. */
  167. # ifndef __USE_FILE_OFFSET64
  168. extern int posix_fadvise (int __fd, __off_t __offset, __off_t __len,
  169. int __advise) __THROW;
  170. # else
  171. # ifdef __REDIRECT_NTH
  172. extern int __REDIRECT_NTH (posix_fadvise, (int __fd, __off64_t __offset,
  173. __off64_t __len, int __advise),
  174. posix_fadvise64);
  175. # else
  176. # define posix_fadvise posix_fadvise64
  177. # endif
  178. # endif
  179. # ifdef __USE_LARGEFILE64
  180. extern int posix_fadvise64 (int __fd, __off64_t __offset, __off64_t __len,
  181. int __advise) __THROW;
  182. # endif
  183. #endif
  184. #if 0 /* && defined __UCLIBC_HAS_ADVANCED_REALTIME__ */
  185. /* FIXME -- uClibc should probably implement these... */
  186. /* Reserve storage for the data of the file associated with FD.
  187. This function is a possible cancellation points and therefore not
  188. marked with __THROW. */
  189. # ifndef __USE_FILE_OFFSET64
  190. extern int posix_fallocate (int __fd, __off_t __offset, __off_t __len);
  191. # else
  192. # ifdef __REDIRECT
  193. extern int __REDIRECT (posix_fallocate, (int __fd, __off64_t __offset,
  194. __off64_t __len),
  195. posix_fallocate64);
  196. # else
  197. # define posix_fallocate posix_fallocate64
  198. # endif
  199. # endif
  200. # ifdef __USE_LARGEFILE64
  201. extern int posix_fallocate64 (int __fd, __off64_t __offset, __off64_t __len);
  202. # endif
  203. #endif
  204. #ifdef __UCLIBC_HAS_THREADS_NATIVE__
  205. extern int __fcntl_nocancel (int fd, int cmd, ...);
  206. #endif
  207. __END_DECLS
  208. #endif /* fcntl.h */