fanotify.h 3.4 KB

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  1. #ifndef _LINUX_FANOTIFY_H
  2. #define _LINUX_FANOTIFY_H
  3. #include <linux/types.h>
  4. /* the following events that user-space can register for */
  5. #define FAN_ACCESS 0x00000001 /* File was accessed */
  6. #define FAN_MODIFY 0x00000002 /* File was modified */
  7. #define FAN_CLOSE_WRITE 0x00000008 /* Writtable file closed */
  8. #define FAN_CLOSE_NOWRITE 0x00000010 /* Unwrittable file closed */
  9. #define FAN_OPEN 0x00000020 /* File was opened */
  10. #define FAN_Q_OVERFLOW 0x00004000 /* Event queued overflowed */
  11. #define FAN_OPEN_PERM 0x00010000 /* File open in perm check */
  12. #define FAN_ACCESS_PERM 0x00020000 /* File accessed in perm check */
  13. #define FAN_ONDIR 0x40000000 /* event occurred against dir */
  14. #define FAN_EVENT_ON_CHILD 0x08000000 /* interested in child events */
  15. /* helper events */
  16. #define FAN_CLOSE (FAN_CLOSE_WRITE | FAN_CLOSE_NOWRITE) /* close */
  17. /* flags used for fanotify_init() */
  18. #define FAN_CLOEXEC 0x00000001
  19. #define FAN_NONBLOCK 0x00000002
  20. /* These are NOT bitwise flags. Both bits are used togther. */
  21. #define FAN_CLASS_NOTIF 0x00000000
  22. #define FAN_CLASS_CONTENT 0x00000004
  23. #define FAN_CLASS_PRE_CONTENT 0x00000008
  24. #define FAN_ALL_CLASS_BITS (FAN_CLASS_NOTIF | FAN_CLASS_CONTENT | \
  25. FAN_CLASS_PRE_CONTENT)
  26. #define FAN_UNLIMITED_QUEUE 0x00000010
  27. #define FAN_UNLIMITED_MARKS 0x00000020
  28. #define FAN_ALL_INIT_FLAGS (FAN_CLOEXEC | FAN_NONBLOCK | \
  29. FAN_ALL_CLASS_BITS | FAN_UNLIMITED_QUEUE |\
  30. FAN_UNLIMITED_MARKS)
  31. /* flags used for fanotify_modify_mark() */
  32. #define FAN_MARK_ADD 0x00000001
  33. #define FAN_MARK_REMOVE 0x00000002
  34. #define FAN_MARK_DONT_FOLLOW 0x00000004
  35. #define FAN_MARK_ONLYDIR 0x00000008
  36. #define FAN_MARK_MOUNT 0x00000010
  37. #define FAN_MARK_IGNORED_MASK 0x00000020
  38. #define FAN_MARK_IGNORED_SURV_MODIFY 0x00000040
  39. #define FAN_MARK_FLUSH 0x00000080
  40. #define FAN_ALL_MARK_FLAGS (FAN_MARK_ADD |\
  41. FAN_MARK_REMOVE |\
  42. FAN_MARK_DONT_FOLLOW |\
  43. FAN_MARK_ONLYDIR |\
  44. FAN_MARK_MOUNT |\
  45. FAN_MARK_IGNORED_MASK |\
  46. FAN_MARK_IGNORED_SURV_MODIFY |\
  47. FAN_MARK_FLUSH)
  48. /*
  49. * All of the events - we build the list by hand so that we can add flags in
  50. * the future and not break backward compatibility. Apps will get only the
  51. * events that they originally wanted. Be sure to add new events here!
  52. */
  53. #define FAN_ALL_EVENTS (FAN_ACCESS |\
  54. FAN_MODIFY |\
  55. FAN_CLOSE |\
  56. FAN_OPEN)
  57. /*
  58. * All events which require a permission response from userspace
  59. */
  60. #define FAN_ALL_PERM_EVENTS (FAN_OPEN_PERM |\
  61. FAN_ACCESS_PERM)
  62. #define FAN_ALL_OUTGOING_EVENTS (FAN_ALL_EVENTS |\
  63. FAN_ALL_PERM_EVENTS |\
  64. FAN_Q_OVERFLOW)
  65. #define FANOTIFY_METADATA_VERSION 3
  66. struct fanotify_event_metadata {
  67. __u32 event_len;
  68. __u8 vers;
  69. __u8 reserved;
  70. __u16 metadata_len;
  71. __aligned_u64 mask;
  72. __s32 fd;
  73. __s32 pid;
  74. };
  75. struct fanotify_response {
  76. __s32 fd;
  77. __u32 response;
  78. };
  79. /* Legit userspace responses to a _PERM event */
  80. #define FAN_ALLOW 0x01
  81. #define FAN_DENY 0x02
  82. /* No fd set in event */
  83. #define FAN_NOFD -1
  84. /* Helper functions to deal with fanotify_event_metadata buffers */
  85. #define FAN_EVENT_METADATA_LEN (sizeof(struct fanotify_event_metadata))
  86. #define FAN_EVENT_NEXT(meta, len) ((len) -= (meta)->event_len, \
  87. (struct fanotify_event_metadata*)(((char *)(meta)) + \
  88. (meta)->event_len))
  89. #define FAN_EVENT_OK(meta, len) ((long)(len) >= (long)FAN_EVENT_METADATA_LEN && \
  90. (long)(meta)->event_len >= (long)FAN_EVENT_METADATA_LEN && \
  91. (long)(meta)->event_len <= (long)(len))
  92. #endif /* _LINUX_FANOTIFY_H */