fcntl.h 8.9 KB

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  1. /* O_*, F_*, FD_* bit values for Linux.
  2. Copyright (C) 2000, 2004 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, see
  14. <http://www.gnu.org/licenses/>. */
  15. #ifndef _FCNTL_H
  16. # error "Never use <bits/fcntl.h> directly; include <fcntl.h> instead."
  17. #endif
  18. #include <sys/types.h>
  19. #ifdef __USE_GNU
  20. # include <bits/uio.h>
  21. #endif
  22. /* open/fcntl - O_SYNC is only implemented on blocks devices and on files
  23. located on an ext2 file system */
  24. #define O_ACCMODE 0003
  25. #define O_RDONLY 00
  26. #define O_WRONLY 01
  27. #define O_RDWR 02
  28. #define O_CREAT 0100 /* not fcntl */
  29. #define O_EXCL 0200 /* not fcntl */
  30. #define O_NOCTTY 0400 /* not fcntl */
  31. #define O_TRUNC 01000 /* not fcntl */
  32. #define O_APPEND 02000
  33. #define O_NONBLOCK 04000
  34. #define O_NDELAY O_NONBLOCK
  35. #define O_SYNC 010000
  36. #define O_FSYNC O_SYNC
  37. #define O_ASYNC 020000
  38. #ifdef __USE_XOPEN2K8
  39. # define O_DIRECTORY 0200000 /* Must be a directory. */
  40. # define O_NOFOLLOW 0400000 /* Do not follow links. */
  41. # define O_CLOEXEC 02000000 /* set close_on_exec */
  42. #endif
  43. #ifdef __USE_GNU
  44. # define O_DIRECT 040000 /* Direct disk access. */
  45. # define O_NOATIME 01000000 /* Do not set atime. */
  46. # define O_PATH 010000000 /* Resolve pathname but do not open file. */
  47. # define O_TMPFILE 020200000 /* Atomically create nameless file. */
  48. #endif
  49. /* For now Linux has synchronisity options for data and read operations.
  50. We define the symbols here but let them do the same as O_SYNC since
  51. this is a superset. */
  52. #if defined __USE_POSIX199309 || defined __USE_UNIX98
  53. # define O_DSYNC O_SYNC /* Synchronize data. */
  54. # define O_RSYNC O_SYNC /* Synchronize read operations. */
  55. #endif
  56. #ifdef __USE_LARGEFILE64
  57. # define O_LARGEFILE 0400000
  58. #endif
  59. /* Values for the second argument to `fcntl'. */
  60. #define F_DUPFD 0 /* Duplicate file descriptor. */
  61. #define F_GETFD 1 /* Get file descriptor flags. */
  62. #define F_SETFD 2 /* Set file descriptor flags. */
  63. #define F_GETFL 3 /* Get file status flags. */
  64. #define F_SETFL 4 /* Set file status flags. */
  65. #ifndef __USE_FILE_OFFSET64
  66. # define F_GETLK 5 /* Get record locking info. */
  67. # define F_SETLK 6 /* Set record locking info (non-blocking). */
  68. # define F_SETLKW 7 /* Set record locking info (blocking). */
  69. #else
  70. # define F_GETLK F_GETLK64 /* Get record locking info. */
  71. # define F_SETLK F_SETLK64 /* Set record locking info (non-blocking).*/
  72. # define F_SETLKW F_SETLKW64 /* Set record locking info (blocking). */
  73. #endif
  74. #define F_GETLK64 12 /* Get record locking info. */
  75. #define F_SETLK64 13 /* Set record locking info (non-blocking). */
  76. #define F_SETLKW64 14 /* Set record locking info (blocking). */
  77. #if defined __USE_BSD || defined __USE_UNIX98
  78. # define F_SETOWN 8 /* Get owner of socket (receiver of SIGIO). */
  79. # define F_GETOWN 9 /* Set owner of socket (receiver of SIGIO). */
  80. #endif
  81. #ifdef __USE_GNU
  82. # define F_SETSIG 10 /* Set number of signal to be sent. */
  83. # define F_GETSIG 11 /* Get number of signal to be sent. */
  84. #endif
  85. #ifdef __USE_GNU
  86. # define F_SETLEASE 1024 /* Set a lease. */
  87. # define F_GETLEASE 1025 /* Enquire what lease is active. */
  88. # define F_NOTIFY 1026 /* Request notfications on a directory. */
  89. # define F_SETPIPE_SZ 1031 /* Set pipe page size array. */
  90. # define F_GETPIPE_SZ 1032 /* Get pipe page size array. */
  91. #endif
  92. #if defined __USE_XOPEN2K8 || defined __USE_GNU
  93. # define F_DUPFD_CLOEXEC 1030 /* Duplicate file descriptor with
  94. close-on-exit set on new fd. */
  95. #endif
  96. /* For F_[GET|SET]FL. */
  97. #define FD_CLOEXEC 1 /* actually anything with low bit set goes */
  98. /* For posix fcntl() and `l_type' field of a `struct flock' for lockf(). */
  99. #define F_RDLCK 0 /* Read lock. */
  100. #define F_WRLCK 1 /* Write lock. */
  101. #define F_UNLCK 2 /* Remove lock. */
  102. /* For old implementation of bsd flock(). */
  103. #define F_EXLCK 4 /* or 3 */
  104. #define F_SHLCK 8 /* or 4 */
  105. #ifdef __USE_BSD
  106. /* Operations for bsd flock(), also used by the kernel implementation. */
  107. # define LOCK_SH 1 /* shared lock */
  108. # define LOCK_EX 2 /* exclusive lock */
  109. # define LOCK_NB 4 /* or'd with one of the above to prevent
  110. blocking */
  111. # define LOCK_UN 8 /* remove lock */
  112. #endif
  113. #ifdef __USE_GNU
  114. # define LOCK_MAND 32 /* This is a mandatory flock: */
  115. # define LOCK_READ 64 /* ... which allows concurrent read operations. */
  116. # define LOCK_WRITE 128 /* ... which allows concurrent write operations. */
  117. # define LOCK_RW 192 /* ... Which allows concurrent read & write operations. */
  118. #endif
  119. #ifdef __USE_GNU
  120. /* Types of directory notifications that may be requested with F_NOTIFY. */
  121. # define DN_ACCESS 0x00000001 /* File accessed. */
  122. # define DN_MODIFY 0x00000002 /* File modified. */
  123. # define DN_CREATE 0x00000004 /* File created. */
  124. # define DN_DELETE 0x00000008 /* File removed. */
  125. # define DN_RENAME 0x00000010 /* File renamed. */
  126. # define DN_ATTRIB 0x00000020 /* File changed attibutes. */
  127. # define DN_MULTISHOT 0x80000000 /* Don't remove notifier. */
  128. #endif
  129. struct flock
  130. {
  131. short int l_type; /* Type of lock: F_RDLCK, F_WRLCK, or F_UNLCK. */
  132. short int l_whence; /* Where `l_start' is relative to (like `lseek'). */
  133. #ifndef __USE_FILE_OFFSET64
  134. __off_t l_start; /* Offset where the lock begins. */
  135. __off_t l_len; /* Size of the locked area; zero means until EOF. */
  136. #else
  137. __off64_t l_start; /* Offset where the lock begins. */
  138. __off64_t l_len; /* Size of the locked area; zero means until EOF. */
  139. #endif
  140. __pid_t l_pid; /* Process holding the lock. */
  141. };
  142. #ifdef __USE_LARGEFILE64
  143. struct flock64
  144. {
  145. short int l_type; /* Type of lock: F_RDLCK, F_WRLCK, or F_UNLCK. */
  146. short int l_whence; /* Where `l_start' is relative to (like `lseek'). */
  147. __off64_t l_start; /* Offset where the lock begins. */
  148. __off64_t l_len; /* Size of the locked area; zero means until EOF. */
  149. __pid_t l_pid; /* Process holding the lock. */
  150. };
  151. #endif
  152. /* Define some more compatibility macros to be backward compatible with
  153. BSD systems which did not managed to hide these kernel macros. */
  154. #ifdef __USE_BSD
  155. # define FAPPEND O_APPEND
  156. # define FFSYNC O_FSYNC
  157. # define FASYNC O_ASYNC
  158. # define FNONBLOCK O_NONBLOCK
  159. # define FNDELAY O_NDELAY
  160. #endif /* Use BSD. */
  161. /* Advise to `posix_fadvise'. */
  162. #ifdef __USE_XOPEN2K
  163. # define POSIX_FADV_NORMAL 0 /* No further special treatment. */
  164. # define POSIX_FADV_RANDOM 1 /* Expect random page references. */
  165. # define POSIX_FADV_SEQUENTIAL 2 /* Expect sequential page references. */
  166. # define POSIX_FADV_WILLNEED 3 /* Will need these pages. */
  167. # define POSIX_FADV_DONTNEED 4 /* Don't need these pages. */
  168. # define POSIX_FADV_NOREUSE 5 /* Data will be accessed once. */
  169. #endif
  170. #if defined __USE_GNU && defined __UCLIBC_LINUX_SPECIFIC__
  171. /* Flags for SYNC_FILE_RANGE. */
  172. # define SYNC_FILE_RANGE_WAIT_BEFORE 1 /* Wait upon writeout of all pages
  173. in the range before performing the
  174. write. */
  175. # define SYNC_FILE_RANGE_WRITE 2 /* Initiate writeout of all those
  176. dirty pages in the range which are
  177. not presently under writeback. */
  178. # define SYNC_FILE_RANGE_WAIT_AFTER 4 /* Wait upon writeout of all pages in
  179. the range after performing the
  180. write. */
  181. /* Flags for SPLICE and VMSPLICE. */
  182. # define SPLICE_F_MOVE 1 /* Move pages instead of copying. */
  183. # define SPLICE_F_NONBLOCK 2 /* Don't block on the pipe splicing
  184. (but we may still block on the fd
  185. we splice from/to). */
  186. # define SPLICE_F_MORE 4 /* Expect more data. */
  187. # define SPLICE_F_GIFT 8 /* Pages passed in are a gift. */
  188. #endif
  189. __BEGIN_DECLS
  190. #if defined __USE_GNU && defined __UCLIBC_LINUX_SPECIFIC__
  191. /* Provide kernel hint to read ahead. */
  192. extern ssize_t readahead (int __fd, __off64_t __offset, size_t __count)
  193. __THROW;
  194. /* Selective file content synch'ing. */
  195. extern int sync_file_range (int __fd, __off64_t __from, __off64_t __to,
  196. unsigned int __flags);
  197. /* Splice address range into a pipe. */
  198. extern ssize_t vmsplice (int __fdout, const struct iovec *__iov,
  199. size_t __count, unsigned int __flags);
  200. /* Splice two files together. */
  201. extern ssize_t splice (int __fdin, __off64_t *__offin, int __fdout,
  202. __off64_t *__offout, size_t __len,
  203. unsigned int __flags);
  204. /* In-kernel implementation of tee for pipe buffers. */
  205. extern ssize_t tee (int __fdin, int __fdout, size_t __len,
  206. unsigned int __flags);
  207. #endif
  208. __END_DECLS