fcntl.h 5.7 KB

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  1. /* Copyright (C) 1991,92,94,95,96,97,98,99,2000,2001 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: 6.5 File Control Operations <fcntl.h>
  17. */
  18. #ifndef _FCNTL_H
  19. #define _FCNTL_H 1
  20. #include <features.h>
  21. /* This must be early so <bits/fcntl.h> can define types winningly. */
  22. __BEGIN_DECLS
  23. /* Get the definitions of O_*, F_*, FD_*: all the
  24. numbers and flag bits for `open', `fcntl', et al. */
  25. #include <bits/fcntl.h>
  26. /* For XPG all symbols from <sys/stat.h> should also be available. */
  27. #ifdef __USE_XOPEN
  28. # include <sys/stat.h>
  29. #endif
  30. #ifdef __USE_MISC
  31. # ifndef R_OK /* Verbatim from <unistd.h>. Ugh. */
  32. /* Values for the second argument to access.
  33. These may be OR'd together. */
  34. # define R_OK 4 /* Test for read permission. */
  35. # define W_OK 2 /* Test for write permission. */
  36. # define X_OK 1 /* Test for execute permission. */
  37. # define F_OK 0 /* Test for existence. */
  38. # endif
  39. #endif /* Use misc. */
  40. /* XPG wants the following symbols. */
  41. #ifdef __USE_XOPEN /* <stdio.h> has the same definitions. */
  42. # define SEEK_SET 0 /* Seek from beginning of file. */
  43. # define SEEK_CUR 1 /* Seek from current position. */
  44. # define SEEK_END 2 /* Seek from end of file. */
  45. #endif /* XPG */
  46. /* Do the file control operation described by CMD on FD.
  47. The remaining arguments are interpreted depending on CMD. */
  48. #ifndef __USE_FILE_OFFSET64
  49. extern int fcntl (int __fd, int __cmd, ...) __THROW;
  50. #else
  51. # ifdef __REDIRECT
  52. extern int __REDIRECT (fcntl, (int __fd, int __cmd, ...) __THROW,
  53. fcntl64);
  54. # else
  55. # define fcntl fcntl64
  56. # endif
  57. #endif
  58. /* Open FILE and return a new file descriptor for it, or -1 on error.
  59. OFLAG determines the type of access used. If O_CREAT is on OFLAG,
  60. the third argument is taken as a `mode_t', the mode of the created file. */
  61. #ifndef __USE_FILE_OFFSET64
  62. extern int open (__const char *__file, int __oflag, ...) __THROW;
  63. #else
  64. # ifdef __REDIRECT
  65. extern int __REDIRECT (open, (__const char *__file, int __oflag, ...) __THROW,
  66. open64);
  67. # else
  68. # define open open64
  69. # endif
  70. #endif
  71. #ifdef __USE_LARGEFILE64
  72. extern int open64 (__const char *__file, int __oflag, ...) __THROW;
  73. #endif
  74. /* Create and open FILE, with mode MODE.
  75. This takes an `int' MODE argument because that is
  76. what `mode_t' will be widened to. */
  77. #ifndef __USE_FILE_OFFSET64
  78. extern int creat (__const char *__file, __mode_t __mode) __THROW;
  79. #else
  80. # ifdef __REDIRECT
  81. extern int __REDIRECT (creat, (__const char *__file, __mode_t __mode) __THROW,
  82. creat64);
  83. # else
  84. # define creat creat64
  85. # endif
  86. #endif
  87. #ifdef __USE_LARGEFILE64
  88. extern int creat64 (__const char *__file, __mode_t __mode) __THROW;
  89. #endif
  90. #if !defined F_LOCK && (defined __USE_MISC || (defined __USE_XOPEN_EXTENDED \
  91. && !defined __USE_POSIX))
  92. /* NOTE: These declarations also appear in <unistd.h>; be sure to keep both
  93. files consistent. Some systems have them there and some here, and some
  94. software depends on the macros being defined without including both. */
  95. /* `lockf' is a simpler interface to the locking facilities of `fcntl'.
  96. LEN is always relative to the current file position.
  97. The CMD argument is one of the following. */
  98. # define F_ULOCK 0 /* Unlock a previously locked region. */
  99. # define F_LOCK 1 /* Lock a region for exclusive use. */
  100. # define F_TLOCK 2 /* Test and lock a region for exclusive use. */
  101. # define F_TEST 3 /* Test a region for other processes locks. */
  102. # ifndef __USE_FILE_OFFSET64
  103. extern int lockf (int __fd, int __cmd, __off_t __len) __THROW;
  104. # else
  105. # ifdef __REDIRECT
  106. extern int __REDIRECT (lockf, (int __fd, int __cmd, __off64_t __len) __THROW,
  107. lockf64);
  108. # else
  109. # define lockf lockf64
  110. # endif
  111. # endif
  112. # ifdef __USE_LARGEFILE64
  113. extern int lockf64 (int __fd, int __cmd, __off64_t __len) __THROW;
  114. # endif
  115. #endif
  116. #ifdef __USE_XOPEN2K
  117. /* Advice the system about the expected behaviour of the application with
  118. respect to the file associated with FD. */
  119. # ifndef __USE_FILE_OFFSET64
  120. extern int posix_fadvise (int __fd, __off_t __offset, size_t __len,
  121. int __advise) __THROW;
  122. # else
  123. # ifdef __REDIRECT
  124. extern int __REDIRECT (posix_fadvise, (int __fd, __off64_t __offset,
  125. size_t __len, int __advise) __THROW,
  126. posix_fadvise64);
  127. # else
  128. # define posix_fadvise posix_fadvise64
  129. # endif
  130. # endif
  131. # ifdef __USE_LARGEFILE64
  132. extern int posix_fadvise64 (int __fd, __off64_t __offset, size_t __len,
  133. int __advise) __THROW;
  134. # endif
  135. /* Reserve storage for the data of the file associated with FD. */
  136. # ifndef __USE_FILE_OFFSET64
  137. extern int posix_fallocate (int __fd, __off_t __offset, size_t __len) __THROW;
  138. # else
  139. # ifdef __REDIRECT
  140. extern int __REDIRECT (posix_fallocate, (int __fd, __off64_t __offset,
  141. size_t __len) __THROW,
  142. posix_fallocate64);
  143. # else
  144. # define posix_fallocate posix_fallocate64
  145. # endif
  146. # endif
  147. # ifdef __USE_LARGEFILE64
  148. extern int posix_fallocate64 (int __fd, __off64_t __offset, size_t __len)
  149. __THROW;
  150. # endif
  151. #endif
  152. __END_DECLS
  153. #endif /* fcntl.h */