fcntl.h 7.0 KB

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  1. /* O_*, F_*, FD_* bit values for Linux.
  2. Copyright (C) 1995-1998, 2000, 2004, 2006 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. #ifndef _FCNTL_H
  17. # error "Never use <bits/fcntl.h> directly; include <fcntl.h> instead."
  18. #endif
  19. #include <sys/types.h>
  20. /* open/fcntl - O_SYNC is only implemented on blocks devices and on files
  21. located on an ext2 file system */
  22. #define O_ACCMODE 0003
  23. #define O_RDONLY 00
  24. #define O_WRONLY 01
  25. #define O_RDWR 02
  26. #define O_CREAT 0100 /* not fcntl */
  27. #define O_EXCL 0200 /* not fcntl */
  28. #define O_NOCTTY 0400 /* not fcntl */
  29. #define O_TRUNC 01000 /* not fcntl */
  30. #define O_APPEND 02000
  31. #define O_NONBLOCK 04000
  32. #define O_NDELAY O_NONBLOCK
  33. #define O_SYNC 010000
  34. #define O_FSYNC O_SYNC
  35. #define O_ASYNC 020000
  36. #ifdef __USE_GNU
  37. # define O_DIRECTORY 040000 /* Must be a directory. */
  38. # define O_NOFOLLOW 0100000 /* Do not follow links. */
  39. # define O_DIRECT 0200000 /* Direct disk access. */
  40. # define O_NOATIME 01000000 /* Do not set atime. */
  41. #endif
  42. #ifdef __USE_LARGEFILE64
  43. # define O_LARGEFILE 0400000
  44. #endif
  45. /* For now Linux has synchronisity options for data and read operations.
  46. We define the symbols here but let them do the same as O_SYNC since
  47. this is a superset. */
  48. #if defined __USE_POSIX199309 || defined __USE_UNIX98
  49. # define O_DSYNC O_SYNC /* Synchronize data. */
  50. # define O_RSYNC O_SYNC /* Synchronize read operations. */
  51. #endif
  52. /* Values for the second argument to `fcntl'. */
  53. #define F_DUPFD 0 /* Duplicate file descriptor. */
  54. #define F_GETFD 1 /* Get file descriptor flags. */
  55. #define F_SETFD 2 /* Set file descriptor flags. */
  56. #define F_GETFL 3 /* Get file status flags. */
  57. #define F_SETFL 4 /* Set file status flags. */
  58. #ifndef __USE_FILE_OFFSET64
  59. # define F_GETLK 5 /* Get record locking info. */
  60. # define F_SETLK 6 /* Set record locking info (non-blocking). */
  61. # define F_SETLKW 7 /* Set record locking info (blocking). */
  62. #else
  63. # define F_GETLK F_GETLK64 /* Get record locking info. */
  64. # define F_SETLK F_SETLK64 /* Set record locking info (non-blocking).*/
  65. # define F_SETLKW F_SETLKW64 /* Set record locking info (blocking). */
  66. #endif
  67. #define F_GETLK64 12 /* Get record locking info. */
  68. #define F_SETLK64 13 /* Set record locking info (non-blocking). */
  69. #define F_SETLKW64 14 /* Set record locking info (blocking). */
  70. #if defined __USE_BSD || defined __USE_UNIX98
  71. # define F_SETOWN 8 /* Get owner of socket (receiver of SIGIO). */
  72. # define F_GETOWN 9 /* Set owner of socket (receiver of SIGIO). */
  73. #endif
  74. #ifdef __USE_GNU
  75. # define F_SETSIG 10 /* Set number of signal to be sent. */
  76. # define F_GETSIG 11 /* Get number of signal to be sent. */
  77. #endif
  78. #ifdef __USE_GNU
  79. # define F_SETLEASE 1024 /* Set a lease. */
  80. # define F_GETLEASE 1025 /* Enquire what lease is active. */
  81. # define F_NOTIFY 1026 /* Request notfications on a directory. */
  82. #endif
  83. /* For F_[GET|SET]FL. */
  84. #define FD_CLOEXEC 1 /* actually anything with low bit set goes */
  85. /* For posix fcntl() and `l_type' field of a `struct flock' for lockf(). */
  86. #define F_RDLCK 0 /* Read lock. */
  87. #define F_WRLCK 1 /* Write lock. */
  88. #define F_UNLCK 2 /* Remove lock. */
  89. /* for old implementation of bsd flock () */
  90. #define F_EXLCK 4 /* or 3 */
  91. #define F_SHLCK 8 /* or 4 */
  92. #ifdef __USE_BSD
  93. /* Operations for bsd flock(), also used by the kernel implementation */
  94. # define LOCK_SH 1 /* shared lock */
  95. # define LOCK_EX 2 /* exclusive lock */
  96. # define LOCK_NB 4 /* or'd with one of the above to prevent
  97. blocking */
  98. # define LOCK_UN 8 /* remove lock */
  99. #endif
  100. #ifdef __USE_GNU
  101. # define LOCK_MAND 32 /* This is a mandatory flock: */
  102. # define LOCK_READ 64 /* ... which allows concurrent read operations. */
  103. # define LOCK_WRITE 128 /* ... which allows concurrent write operations. */
  104. # define LOCK_RW 192 /* ... Which allows concurrent read & write operations. */
  105. #endif
  106. #ifdef __USE_GNU
  107. /* Types of directory notifications that may be requested with F_NOTIFY. */
  108. # define DN_ACCESS 0x00000001 /* File accessed. */
  109. # define DN_MODIFY 0x00000002 /* File modified. */
  110. # define DN_CREATE 0x00000004 /* File created. */
  111. # define DN_DELETE 0x00000008 /* File removed. */
  112. # define DN_RENAME 0x00000010 /* File renamed. */
  113. # define DN_ATTRIB 0x00000020 /* File changed attibutes. */
  114. # define DN_MULTISHOT 0x80000000 /* Don't remove notifier. */
  115. #endif
  116. struct flock
  117. {
  118. short int l_type; /* Type of lock: F_RDLCK, F_WRLCK, or F_UNLCK. */
  119. short int l_whence; /* Where `l_start' is relative to (like `lseek'). */
  120. #ifndef __USE_FILE_OFFSET64
  121. __off_t l_start; /* Offset where the lock begins. */
  122. __off_t l_len; /* Size of the locked area; zero means until EOF. */
  123. #else
  124. __off64_t l_start; /* Offset where the lock begins. */
  125. __off64_t l_len; /* Size of the locked area; zero means until EOF. */
  126. #endif
  127. __pid_t l_pid; /* Process holding the lock. */
  128. };
  129. #ifdef __USE_LARGEFILE64
  130. struct flock64
  131. {
  132. short int l_type; /* Type of lock: F_RDLCK, F_WRLCK, or F_UNLCK. */
  133. short int l_whence; /* Where `l_start' is relative to (like `lseek'). */
  134. __off64_t l_start; /* Offset where the lock begins. */
  135. __off64_t l_len; /* Size of the locked area; zero means until EOF. */
  136. __pid_t l_pid; /* Process holding the lock. */
  137. };
  138. #endif
  139. /* Define some more compatibility macros to be backward compatible with
  140. BSD systems which did not managed to hide these kernel macros. */
  141. #ifdef __USE_BSD
  142. # define FAPPEND O_APPEND
  143. # define FFSYNC O_FSYNC
  144. # define FASYNC O_ASYNC
  145. # define FNONBLOCK O_NONBLOCK
  146. # define FNDELAY O_NDELAY
  147. #endif /* Use BSD. */
  148. /* Advise to `posix_fadvise'. */
  149. #ifdef __USE_XOPEN2K
  150. # define POSIX_FADV_NORMAL 0 /* No further special treatment. */
  151. # define POSIX_FADV_RANDOM 1 /* Expect random page references. */
  152. # define POSIX_FADV_SEQUENTIAL 2 /* Expect sequential page references. */
  153. # define POSIX_FADV_WILLNEED 3 /* Will need these pages. */
  154. # define POSIX_FADV_DONTNEED 4 /* Don't need these pages. */
  155. # define POSIX_FADV_NOREUSE 5 /* Data will be accessed once. */
  156. #endif
  157. /* Linux-specific operations for posix_fadvise. */
  158. #ifdef __USE_GNU
  159. # define LINUX_FADV_ASYNC_WRITE 32 /* Start writeout on range. */
  160. # define LINUX_FADV_WRITE_WAIT 33 /* Wait upon writeout to range. */
  161. #endif
  162. __BEGIN_DECLS
  163. /* Provide kernel hint to read ahead. */
  164. extern ssize_t readahead (int __fd, __off64_t __offset, size_t __count)
  165. __THROW;
  166. __END_DECLS