fcntl.h 5.0 KB

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  1. /* O_*, F_*, FD_* bit values for Linux.
  2. Copyright (C) 1995, 1996, 1997, 1998 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 Library General Public License as
  6. published by the Free Software Foundation; either version 2 of the
  7. 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. Library General Public License for more details.
  12. You should have received a copy of the GNU Library General Public
  13. License along with the GNU C Library; see the file COPYING.LIB. If not,
  14. write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  15. Boston, MA 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_DIRECT 040000 /* Direct disk access. */
  38. # define O_DIRECTORY 0200000 /* Must be a directory. */
  39. # define O_NOFOLLOW 0400000 /* Do not follow links. */
  40. #endif
  41. /* For now Linux has synchronisity options for data and read operations.
  42. We define the symbols here but let them do the same as O_SYNC since
  43. this is a superset. */
  44. #if defined __USE_POSIX199309 || defined __USE_UNIX98
  45. # define O_DSYNC O_SYNC /* Synchronize data. */
  46. # define O_RSYNC O_SYNC /* Synchronize read operations. */
  47. #endif
  48. #ifdef __USE_LARGEFILE64
  49. # define O_LARGEFILE 0100000
  50. #endif
  51. /* Values for the second argument to `fcntl'. */
  52. #define F_DUPFD 0 /* Duplicate file descriptor. */
  53. #define F_GETFD 1 /* Get file descriptor flags. */
  54. #define F_SETFD 2 /* Set file descriptor flags. */
  55. #define F_GETFL 3 /* Get file status flags. */
  56. #define F_SETFL 4 /* Set file status flags. */
  57. #define F_GETLK 5 /* Get record locking info. */
  58. #define F_SETLK 6 /* Set record locking info (non-blocking). */
  59. #define F_SETLKW 7 /* Set record locking info (blocking). */
  60. /* XXX missing */
  61. #define F_GETLK64 5 /* Get record locking info. */
  62. #define F_SETLK64 6 /* Set record locking info (non-blocking). */
  63. #define F_SETLKW64 7 /* Set record locking info (blocking). */
  64. #ifdef __USE_BSD
  65. # define F_SETOWN 8 /* Get owner of socket (receiver of SIGIO). */
  66. # define F_GETOWN 9 /* Set owner of socket (receiver of SIGIO). */
  67. #endif
  68. #ifdef __USE_GNU
  69. # define F_SETSIG 10 /* Set number of signal to be sent. */
  70. # define F_GETSIG 11 /* Get number of signal to be sent. */
  71. #endif
  72. /* For F_[GET|SET]FL. */
  73. #define FD_CLOEXEC 1 /* actually anything with low bit set goes */
  74. /* For posix fcntl() and `l_type' field of a `struct flock' for lockf(). */
  75. #define F_RDLCK 0 /* Read lock. */
  76. #define F_WRLCK 1 /* Write lock. */
  77. #define F_UNLCK 2 /* Remove lock. */
  78. /* for old implementation of bsd flock () */
  79. #define F_EXLCK 4 /* or 3 */
  80. #define F_SHLCK 8 /* or 4 */
  81. #ifdef __USE_BSD
  82. /* operations for bsd flock(), also used by the kernel implementation */
  83. # define LOCK_SH 1 /* shared lock */
  84. # define LOCK_EX 2 /* exclusive lock */
  85. # define LOCK_NB 4 /* or'd with one of the above to prevent
  86. blocking */
  87. # define LOCK_UN 8 /* remove lock */
  88. #endif
  89. struct flock
  90. {
  91. short int l_type; /* Type of lock: F_RDLCK, F_WRLCK, or F_UNLCK. */
  92. short int l_whence; /* Where `l_start' is relative to (like `lseek'). */
  93. #ifndef __USE_FILE_OFFSET64
  94. __off_t l_start; /* Offset where the lock begins. */
  95. __off_t l_len; /* Size of the locked area; zero means until EOF. */
  96. #else
  97. __off64_t l_start; /* Offset where the lock begins. */
  98. __off64_t l_len; /* Size of the locked area; zero means until EOF. */
  99. #endif
  100. __pid_t l_pid; /* Process holding the lock. */
  101. };
  102. #ifdef __USE_LARGEFILE64
  103. struct flock64
  104. {
  105. short int l_type; /* Type of lock: F_RDLCK, F_WRLCK, or F_UNLCK. */
  106. short int l_whence; /* Where `l_start' is relative to (like `lseek'). */
  107. __off64_t l_start; /* Offset where the lock begins. */
  108. __off64_t l_len; /* Size of the locked area; zero means until EOF. */
  109. __pid_t l_pid; /* Process holding the lock. */
  110. };
  111. #endif
  112. /* Define some more compatibility macros to be backward compatible with
  113. BSD systems which did not managed to hide these kernel macros. */
  114. #ifdef __USE_BSD
  115. # define FAPPEND O_APPEND
  116. # define FFSYNC O_FSYNC
  117. # define FASYNC O_ASYNC
  118. # define FNONBLOCK O_NONBLOCK
  119. # define FNDELAY O_NDELAY
  120. #endif /* Use BSD. */