release/src-rt-6.x.4708/linux/linux-2.6.36/include/linux/fanotify.h

   1 #ifndef _LINUX_FANOTIFY_H
   2 #define _LINUX_FANOTIFY_H
   3
   4 #include <linux/types.h>
   5
   6 /* the following events that user-space can register for */
   7 #define FAN_ACCESS              0x00000001      /* File was accessed */
   8 #define FAN_MODIFY              0x00000002      /* File was modified */
   9 #define FAN_CLOSE_WRITE         0x00000008      /* Unwrittable file closed */
  10 #define FAN_CLOSE_NOWRITE       0x00000010      /* Writtable file closed */
  11 #define FAN_OPEN                0x00000020      /* File was opened */
  12
  13 #define FAN_EVENT_ON_CHILD      0x08000000      /* interested in child events */
  14
  15 #define FAN_Q_OVERFLOW          0x00004000      /* Event queued overflowed */
  16
  17 #define FAN_OPEN_PERM           0x00010000      /* File open in perm check */
  18 #define FAN_ACCESS_PERM         0x00020000      /* File accessed in perm check */
  19
  20 /* helper events */
  21 #define FAN_CLOSE               (FAN_CLOSE_WRITE | FAN_CLOSE_NOWRITE) /* close */
  22
  23 /* flags used for fanotify_init() */
  24 #define FAN_CLOEXEC             0x00000001
  25 #define FAN_NONBLOCK            0x00000002
  26
  27 #define FAN_ALL_INIT_FLAGS      (FAN_CLOEXEC | FAN_NONBLOCK)
  28
  29 /* flags used for fanotify_modify_mark() */
  30 #define FAN_MARK_ADD            0x00000001
  31 #define FAN_MARK_REMOVE         0x00000002
  32 #define FAN_MARK_DONT_FOLLOW    0x00000004
  33 #define FAN_MARK_ONLYDIR        0x00000008
  34 #define FAN_MARK_MOUNT          0x00000010
  35 #define FAN_MARK_IGNORED_MASK   0x00000020
  36 #define FAN_MARK_IGNORED_SURV_MODIFY    0x00000040
  37 #define FAN_MARK_FLUSH          0x00000080
  38
  39 #define FAN_ALL_MARK_FLAGS      (FAN_MARK_ADD |\
  40                                  FAN_MARK_REMOVE |\
  41                                  FAN_MARK_DONT_FOLLOW |\
  42                                  FAN_MARK_ONLYDIR |\
  43                                  FAN_MARK_MOUNT |\
  44                                  FAN_MARK_IGNORED_MASK |\
  45                                  FAN_MARK_IGNORED_SURV_MODIFY)
  46
  47 /*
  48  * All of the events - we build the list by hand so that we can add flags in
  49  * the future and not break backward compatibility.  Apps will get only the
  50  * events that they originally wanted.  Be sure to add new events here!
  51  */
  52 #define FAN_ALL_EVENTS (FAN_ACCESS |\
  53                         FAN_MODIFY |\
  54                         FAN_CLOSE |\
  55                         FAN_OPEN)
  56
  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
  63 #define FAN_ALL_OUTGOING_EVENTS (FAN_ALL_EVENTS |\
  64                                  FAN_ALL_PERM_EVENTS |\
  65                                  FAN_Q_OVERFLOW)
  66
  67 #define FANOTIFY_METADATA_VERSION       2
  68
  69 struct fanotify_event_metadata {
  70         __u32 event_len;
  71         __u32 vers;
  72         __u64 mask;
  73         __s32 fd;
  74         __s32 pid;
  75 } __attribute__ ((packed));
  76
  77 struct fanotify_response {
  78         __s32 fd;
  79         __u32 response;
  80 } __attribute__ ((packed));
  81
  82 /* Legit userspace responses to a _PERM event */
  83 #define FAN_ALLOW       0x01
  84 #define FAN_DENY        0x02
  85
  86 /* Helper functions to deal with fanotify_event_metadata buffers */
  87 #define FAN_EVENT_METADATA_LEN (sizeof(struct fanotify_event_metadata))
  88
  89 #define FAN_EVENT_NEXT(meta, len) ((len) -= (meta)->event_len, \
  90                                    (struct fanotify_event_metadata*)(((char *)(meta)) + \
  91                                    (meta)->event_len))
  92
  93 #define FAN_EVENT_OK(meta, len) ((long)(len) >= (long)FAN_EVENT_METADATA_LEN && \
  94                                 (long)(meta)->event_len >= (long)FAN_EVENT_METADATA_LEN && \
  95                                 (long)(meta)->event_len <= (long)(len))
  96
  97 #endif /* _LINUX_FANOTIFY_H */