fcntl.h 8.2 KB

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  1. /* O_*, F_*, FD_* bit values for Linux.
  2. Copyright (C) 1995-2000,2004,2005,2006,2007 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. #ifdef __USE_GNU
  21. # include <bits/uio.h>
  22. #endif
  23. /* open/fcntl - O_SYNC is only implemented on blocks devices and on files
  24. located on an ext2 file system */
  25. #define O_ACCMODE 0003
  26. #define O_RDONLY 00
  27. #define O_WRONLY 01
  28. #define O_RDWR 02
  29. #define O_CREAT 01000 /* not fcntl */
  30. #define O_TRUNC 02000 /* not fcntl */
  31. #define O_EXCL 04000 /* not fcntl */
  32. #define O_NOCTTY 010000 /* not fcntl */
  33. #define O_NONBLOCK 00004
  34. #define O_APPEND 00010
  35. #define O_NDELAY O_NONBLOCK
  36. #define O_SYNC 040000
  37. #define O_FSYNC O_SYNC
  38. #define O_ASYNC 020000 /* fcntl, for BSD compatibility */
  39. #ifdef __USE_GNU
  40. # define O_DIRECTORY 0100000 /* Must be a directory. */
  41. # define O_NOFOLLOW 0200000 /* Do not follow links. */
  42. # define O_DIRECT 02000000 /* Direct disk access. */
  43. # define O_NOATIME 04000000 /* Do not set atime. */
  44. # if 0
  45. # define O_CLOEXEC 010000000 /* Set close_on_exec. */
  46. # endif
  47. #endif
  48. #ifdef __USE_LARGEFILE64
  49. /* Not necessary, files are always with 64bit off_t. */
  50. # define O_LARGEFILE 0
  51. #endif
  52. /* For now Linux has synchronisity options for data and read operations.
  53. We define the symbols here but let them do the same as O_SYNC since
  54. this is a superset. */
  55. #if defined __USE_POSIX199309 || defined __USE_UNIX98
  56. # define O_DSYNC O_SYNC /* Synchronize data. */
  57. # define O_RSYNC O_SYNC /* Synchronize read operations. */
  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. #define F_GETLK 7 /* Get record locking info. */
  66. #define F_SETLK 8 /* Set record locking info (non-blocking). */
  67. #define F_SETLKW 9 /* Set record locking info (blocking). */
  68. #define F_GETLK64 F_GETLK /* Get record locking info. */
  69. #define F_SETLK64 F_SETLK /* Set record locking info (non-blocking). */
  70. #define F_SETLKW64 F_SETLKW /* Set record locking info (blocking). */
  71. #if defined __USE_BSD || defined __USE_UNIX98
  72. # define F_SETOWN 5 /* Get owner of socket (receiver of SIGIO). */
  73. # define F_GETOWN 6 /* Set owner of socket (receiver of SIGIO). */
  74. #endif
  75. #ifdef __USE_GNU
  76. # define F_SETSIG 10 /* Set number of signal to be sent. */
  77. # define F_GETSIG 11 /* Get number of signal to be sent. */
  78. #endif
  79. #ifdef __USE_GNU
  80. # define F_SETLEASE 1024 /* Set a lease. */
  81. # define F_GETLEASE 1025 /* Enquire what lease is active. */
  82. # define F_NOTIFY 1026 /* Request notfications on a directory. */
  83. # define F_DUPFD_CLOEXEC 1030 /* Duplicate file descriptor with
  84. close-on-exit set on new fd. */
  85. #endif
  86. /* for F_[GET|SET]FD */
  87. #define FD_CLOEXEC 1 /* actually anything with low bit set goes */
  88. /* For posix fcntl() and `l_type' field of a `struct flock' for lockf() */
  89. #define F_RDLCK 1 /* Read lock. */
  90. #define F_WRLCK 2 /* Write lock. */
  91. #define F_UNLCK 8 /* Remove lock. */
  92. /* for old implementation of bsd flock () */
  93. #define F_EXLCK 16 /* or 3 */
  94. #define F_SHLCK 32 /* or 4 */
  95. /* Operations for bsd flock(), also used by the kernel implementation */
  96. #ifdef __USE_BSD
  97. # define LOCK_SH 1 /* shared lock */
  98. # define LOCK_EX 2 /* exclusive lock */
  99. # define LOCK_NB 4 /* or'd with one of the above to prevent
  100. blocking */
  101. # define LOCK_UN 8 /* remove lock */
  102. #endif
  103. #ifdef __USE_GNU
  104. # define LOCK_MAND 32 /* This is a mandatory flock: */
  105. # define LOCK_READ 64 /* ... which allows concurrent read operations. */
  106. # define LOCK_WRITE 128 /* ... which allows concurrent write operations. */
  107. # define LOCK_RW 192 /* ... Which allows concurrent read & write operations. */
  108. #endif
  109. #ifdef __USE_GNU
  110. /* Types of directory notifications that may be requested with F_NOTIFY. */
  111. # define DN_ACCESS 0x00000001 /* File accessed. */
  112. # define DN_MODIFY 0x00000002 /* File modified. */
  113. # define DN_CREATE 0x00000004 /* File created. */
  114. # define DN_DELETE 0x00000008 /* File removed. */
  115. # define DN_RENAME 0x00000010 /* File renamed. */
  116. # define DN_ATTRIB 0x00000020 /* File changed attibutes. */
  117. # define DN_MULTISHOT 0x80000000 /* Don't remove notifier. */
  118. #endif
  119. /* We don't need to support __USE_FILE_OFFSET64. */
  120. struct flock
  121. {
  122. short int l_type; /* Type of lock: F_RDLCK, F_WRLCK, or F_UNLCK. */
  123. short int l_whence; /* Where `l_start' is relative to (like `lseek'). */
  124. __off_t l_start; /* Offset where the lock begins. */
  125. __off_t l_len; /* Size of the locked area; zero means until EOF. */
  126. __pid_t l_pid; /* Process holding the lock. */
  127. };
  128. #ifdef __USE_LARGEFILE64
  129. struct flock64
  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. __off64_t l_start; /* Offset where the lock begins. */
  134. __off64_t l_len; /* Size of the locked area; zero means until EOF. */
  135. __pid_t l_pid; /* Process holding the lock. */
  136. };
  137. #endif
  138. /* Define some more compatibility macros to be backward compatible with
  139. BSD systems which did not managed to hide these kernel macros. */
  140. #ifdef __USE_BSD
  141. # define FAPPEND O_APPEND
  142. # define FFSYNC O_FSYNC
  143. # define FASYNC O_ASYNC
  144. # define FNONBLOCK O_NONBLOCK
  145. # define FNDELAY O_NDELAY
  146. #endif /* Use BSD. */
  147. /* Advise to `posix_fadvise'. */
  148. #ifdef __USE_XOPEN2K
  149. # define POSIX_FADV_NORMAL 0 /* No further special treatment. */
  150. # define POSIX_FADV_RANDOM 1 /* Expect random page references. */
  151. # define POSIX_FADV_SEQUENTIAL 2 /* Expect sequential page references. */
  152. # define POSIX_FADV_WILLNEED 3 /* Will need these pages. */
  153. # define POSIX_FADV_DONTNEED 4 /* Don't need these pages. */
  154. # define POSIX_FADV_NOREUSE 5 /* Data will be accessed once. */
  155. #endif
  156. #ifdef __USE_GNU
  157. /* Flags for SYNC_FILE_RANGE. */
  158. # define SYNC_FILE_RANGE_WAIT_BEFORE 1 /* Wait upon writeout of all pages
  159. in the range before performing the
  160. write. */
  161. # define SYNC_FILE_RANGE_WRITE 2 /* Initiate writeout of all those
  162. dirty pages in the range which are
  163. not presently under writeback. */
  164. # define SYNC_FILE_RANGE_WAIT_AFTER 4 /* Wait upon writeout of all pages in
  165. the range after performing the
  166. write. */
  167. /* Flags for SPLICE and VMSPLICE. */
  168. # define SPLICE_F_MOVE 1 /* Move pages instead of copying. */
  169. # define SPLICE_F_NONBLOCK 2 /* Don't block on the pipe splicing
  170. (but we may still block on the fd
  171. we splice from/to). */
  172. # define SPLICE_F_MORE 4 /* Expect more data. */
  173. # define SPLICE_F_GIFT 8 /* Pages passed in are a gift. */
  174. #endif
  175. __BEGIN_DECLS
  176. #ifdef __USE_GNU
  177. /* Provide kernel hint to read ahead. */
  178. extern ssize_t readahead (int __fd, __off64_t __offset, size_t __count)
  179. __THROW;
  180. /* Selective file content synch'ing. */
  181. extern int sync_file_range (int __fd, __off64_t __from, __off64_t __to,
  182. unsigned int __flags);
  183. /* Splice address range into a pipe. */
  184. extern ssize_t vmsplice (int __fdout, const struct iovec *__iov,
  185. size_t __count, unsigned int __flags);
  186. /* Splice two files together. */
  187. extern ssize_t splice (int __fdin, __off64_t *__offin, int __fdout,
  188. __off64_t *__offout, size_t __len,
  189. unsigned int __flags);
  190. /* In-kernel implementation of tee for pipe buffers. */
  191. extern ssize_t tee (int __fdin, int __fdout, size_t __len,
  192. unsigned int __flags);
  193. #endif
  194. __END_DECLS