fcntl.h 8.1 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. # ifdef _LIBC
  65. extern int __fcntl_nocancel(int, int, long) attribute_hidden;
  66. libc_hidden_proto(fcntl)
  67. # endif
  68. #else
  69. # ifdef __REDIRECT
  70. extern int __REDIRECT (fcntl, (int __fd, int __cmd, ...), fcntl64);
  71. # else
  72. # define fcntl fcntl64
  73. # endif
  74. #endif
  75. #if defined(__USE_LARGEFILE64) && !defined(__LP64__)
  76. extern int fcntl64 (int __fd, int __cmd, ...);
  77. # ifdef _LIBC
  78. extern int __fcntl64_nocancel(int, int, long) attribute_hidden;
  79. libc_hidden_proto(fcntl64)
  80. # endif
  81. #endif
  82. /* Open FILE and return a new file descriptor for it, or -1 on error.
  83. OFLAG determines the type of access used. If O_CREAT is on OFLAG,
  84. the third argument is taken as a `mode_t', the mode of the created file.
  85. This function is a cancellation point and therefore not marked with
  86. __THROW. */
  87. #ifndef __USE_FILE_OFFSET64
  88. extern int open (__const char *__file, int __oflag, ...) __nonnull ((1));
  89. libc_hidden_proto(open)
  90. # ifdef _LIBC
  91. extern int __open2_nocancel(const char *, int) __nonnull ((1)) attribute_hidden;
  92. extern int __open_nocancel(const char *, int, mode_t) __nonnull ((1)) attribute_hidden;
  93. # endif
  94. #else
  95. # ifdef __REDIRECT
  96. extern int __REDIRECT (open, (__const char *__file, int __oflag, ...), open64)
  97. __nonnull ((1));
  98. # else
  99. # define open open64
  100. # endif
  101. #endif
  102. #ifdef __USE_LARGEFILE64
  103. extern int open64 (__const char *__file, int __oflag, ...) __nonnull ((1));
  104. libc_hidden_proto(open64)
  105. #endif
  106. #ifdef __USE_ATFILE
  107. /* Similar to `open' but a relative path name is interpreted relative to
  108. the directory for which FD is a descriptor.
  109. NOTE: some other `openat' implementation support additional functionality
  110. through this interface, especially using the O_XATTR flag. This is not
  111. yet supported here.
  112. This function is a cancellation point and therefore not marked with
  113. __THROW. */
  114. # ifndef __USE_FILE_OFFSET64
  115. extern int openat (int __fd, __const char *__file, int __oflag, ...)
  116. __nonnull ((2));
  117. libc_hidden_proto(openat)
  118. # else
  119. # ifdef __REDIRECT
  120. extern int __REDIRECT (openat, (int __fd, __const char *__file, int __oflag,
  121. ...), openat64) __nonnull ((2));
  122. # else
  123. # define openat openat64
  124. # endif
  125. # endif
  126. extern int openat64 (int __fd, __const char *__file, int __oflag, ...)
  127. __nonnull ((2));
  128. #endif
  129. /* Create and open FILE, with mode MODE. This takes an `int' MODE
  130. argument because that is what `mode_t' will be widened to.
  131. This function is a cancellation point and therefore not marked with
  132. __THROW. */
  133. #ifndef __USE_FILE_OFFSET64
  134. extern int creat (__const char *__file, __mode_t __mode) __nonnull ((1));
  135. #else
  136. # ifdef __REDIRECT
  137. extern int __REDIRECT (creat, (__const char *__file, __mode_t __mode),
  138. creat64) __nonnull ((1));
  139. # else
  140. # define creat creat64
  141. # endif
  142. #endif
  143. #ifdef __USE_LARGEFILE64
  144. extern int creat64 (__const char *__file, __mode_t __mode) __nonnull ((1));
  145. #endif
  146. #if !defined F_LOCK && (defined __USE_MISC || (defined __USE_XOPEN_EXTENDED \
  147. && !defined __USE_POSIX))
  148. /* NOTE: These declarations also appear in <unistd.h>; be sure to keep both
  149. files consistent. Some systems have them there and some here, and some
  150. software depends on the macros being defined without including both. */
  151. /* `lockf' is a simpler interface to the locking facilities of `fcntl'.
  152. LEN is always relative to the current file position.
  153. The CMD argument is one of the following. */
  154. # define F_ULOCK 0 /* Unlock a previously locked region. */
  155. # define F_LOCK 1 /* Lock a region for exclusive use. */
  156. # define F_TLOCK 2 /* Test and lock a region for exclusive use. */
  157. # define F_TEST 3 /* Test a region for other processes locks. */
  158. # ifndef __USE_FILE_OFFSET64
  159. extern int lockf (int __fd, int __cmd, __off_t __len);
  160. libc_hidden_proto(lockf)
  161. # else
  162. # ifdef __REDIRECT
  163. extern int __REDIRECT (lockf, (int __fd, int __cmd, __off64_t __len), lockf64);
  164. # else
  165. # define lockf lockf64
  166. # endif
  167. # endif
  168. # ifdef __USE_LARGEFILE64
  169. extern int lockf64 (int __fd, int __cmd, __off64_t __len);
  170. # endif
  171. #endif
  172. #if defined __USE_XOPEN2K && defined __UCLIBC_HAS_ADVANCED_REALTIME__
  173. /* Advice the system about the expected behaviour of the application with
  174. respect to the file associated with FD. */
  175. # ifndef __USE_FILE_OFFSET64
  176. extern int posix_fadvise (int __fd, __off_t __offset, __off_t __len,
  177. int __advise) __THROW;
  178. # else
  179. # ifdef __REDIRECT_NTH
  180. extern int __REDIRECT_NTH (posix_fadvise, (int __fd, __off64_t __offset,
  181. __off64_t __len, int __advise),
  182. posix_fadvise64);
  183. # else
  184. # define posix_fadvise posix_fadvise64
  185. # endif
  186. # endif
  187. # ifdef __USE_LARGEFILE64
  188. extern int posix_fadvise64 (int __fd, __off64_t __offset, __off64_t __len,
  189. int __advise) __THROW;
  190. # endif
  191. #endif
  192. #if 0 /* && defined __UCLIBC_HAS_ADVANCED_REALTIME__ */
  193. /* FIXME -- uClibc should probably implement these... */
  194. /* Reserve storage for the data of the file associated with FD.
  195. This function is a possible cancellation points and therefore not
  196. marked with __THROW. */
  197. # ifndef __USE_FILE_OFFSET64
  198. extern int posix_fallocate (int __fd, __off_t __offset, __off_t __len);
  199. # else
  200. # ifdef __REDIRECT
  201. extern int __REDIRECT (posix_fallocate, (int __fd, __off64_t __offset,
  202. __off64_t __len),
  203. posix_fallocate64);
  204. # else
  205. # define posix_fallocate posix_fallocate64
  206. # endif
  207. # endif
  208. # ifdef __USE_LARGEFILE64
  209. extern int posix_fallocate64 (int __fd, __off64_t __offset, __off64_t __len);
  210. # endif
  211. #endif
  212. __END_DECLS
  213. #endif /* fcntl.h */