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 /* FIXME currently Q's have no limit.... */ 16 #define FAN_Q_OVERFLOW 0x00004000 /* Event queued overflowed */ 17 18 #define FAN_OPEN_PERM 0x00010000 /* File open in perm check */ 19 #define FAN_ACCESS_PERM 0x00020000 /* File accessed in perm check */ 20 21 /* helper events */ 22 #define FAN_CLOSE (FAN_CLOSE_WRITE | FAN_CLOSE_NOWRITE) /* close */ 23 24 /* flags used for fanotify_init() */ 25 #define FAN_CLOEXEC 0x00000001 26 #define FAN_NONBLOCK 0x00000002 27 28 #define FAN_ALL_INIT_FLAGS (FAN_CLOEXEC | FAN_NONBLOCK) 29 30 /* flags used for fanotify_modify_mark() */ 31 #define FAN_MARK_ADD 0x00000001 32 #define FAN_MARK_REMOVE 0x00000002 33 #define FAN_MARK_DONT_FOLLOW 0x00000004 34 #define FAN_MARK_ONLYDIR 0x00000008 35 #define FAN_MARK_MOUNT 0x00000010 36 #define FAN_MARK_IGNORED_MASK 0x00000020 37 #define FAN_MARK_IGNORED_SURV_MODIFY 0x00000040 38 #define FAN_MARK_FLUSH 0x00000080 39 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 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 /* 59 * All events which require a permission response from userspace 60 */ 61 #define FAN_ALL_PERM_EVENTS (FAN_OPEN_PERM |\ 62 FAN_ACCESS_PERM) 63 64 #define FAN_ALL_OUTGOING_EVENTS (FAN_ALL_EVENTS |\ 65 FAN_ALL_PERM_EVENTS |\ 66 FAN_Q_OVERFLOW) 67 68 #define FANOTIFY_METADATA_VERSION 2 69 70 struct fanotify_event_metadata { 71 __u32 event_len; 72 __u32 vers; 73 __u64 mask; 74 __s32 fd; 75 __s32 pid; 76 } __attribute__ ((packed)); 77 78 struct fanotify_response { 79 __s32 fd; 80 __u32 response; 81 } __attribute__ ((packed)); 82 83 /* Legit userspace responses to a _PERM event */ 84 #define FAN_ALLOW 0x01 85 #define FAN_DENY 0x02 86 87 /* Helper functions to deal with fanotify_event_metadata buffers */ 88 #define FAN_EVENT_METADATA_LEN (sizeof(struct fanotify_event_metadata)) 89 90 #define FAN_EVENT_NEXT(meta, len) ((len) -= (meta)->event_len, \ 91 (struct fanotify_event_metadata*)(((char *)(meta)) + \ 92 (meta)->event_len)) 93 94 #define FAN_EVENT_OK(meta, len) ((long)(len) >= (long)FAN_EVENT_METADATA_LEN && \ 95 (long)(meta)->event_len >= (long)FAN_EVENT_METADATA_LEN && \ 96 (long)(meta)->event_len <= (long)(len)) 97 98 #endif /* _LINUX_FANOTIFY_H */ 99