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 #ifndef _LINUX_FANOTIFY_H

 #define _LINUX_FANOTIFY_H

 /* This is a Linux header generated by "make headers_install" */

 #include <linux/types.h>

 /* the following events that user-space can register for */

 #define FAN_ACCESS		0x00000001	/* File was accessed */

 #define FAN_MODIFY		0x00000002	/* File was modified */

 #define FAN_CLOSE_WRITE		0x00000008	/* Writtable file closed */

 #define FAN_CLOSE_NOWRITE	0x00000010	/* Unwrittable file closed */

 #define FAN_OPEN		0x00000020	/* File was opened */

 #define FAN_Q_OVERFLOW		0x00004000	/* Event queued overflowed */

 #define FAN_OPEN_PERM		0x00010000	/* File open in perm check */

 #define FAN_ACCESS_PERM		0x00020000	/* File accessed in perm check */

 #define FAN_ONDIR		0x40000000	/* event occurred against dir */

 #define FAN_EVENT_ON_CHILD	0x08000000	/* interested in child events */

 /* helper events */

 #define FAN_CLOSE		(FAN_CLOSE_WRITE | FAN_CLOSE_NOWRITE) /* close */

 /* flags used for fanotify_init() */

 #define FAN_CLOEXEC		0x00000001

 #define FAN_NONBLOCK		0x00000002

 /* These are NOT bitwise flags.  Both bits are used togther.  */

 #define FAN_CLASS_NOTIF		0x00000000

 #define FAN_CLASS_CONTENT	0x00000004

 #define FAN_CLASS_PRE_CONTENT	0x00000008

 #define FAN_ALL_CLASS_BITS	(FAN_CLASS_NOTIF | FAN_CLASS_CONTENT | \

 				 FAN_CLASS_PRE_CONTENT)

 #define FAN_UNLIMITED_QUEUE	0x00000010

 #define FAN_UNLIMITED_MARKS	0x00000020

 #define FAN_ALL_INIT_FLAGS	(FAN_CLOEXEC | FAN_NONBLOCK | \

 				 FAN_ALL_CLASS_BITS | FAN_UNLIMITED_QUEUE |\

 				 FAN_UNLIMITED_MARKS)

 /* flags used for fanotify_modify_mark() */

 #define FAN_MARK_ADD		0x00000001

 #define FAN_MARK_REMOVE		0x00000002

 #define FAN_MARK_DONT_FOLLOW	0x00000004

 #define FAN_MARK_ONLYDIR	0x00000008

 #define FAN_MARK_MOUNT		0x00000010

 #define FAN_MARK_IGNORED_MASK	0x00000020

 #define FAN_MARK_IGNORED_SURV_MODIFY	0x00000040

 #define FAN_MARK_FLUSH		0x00000080

 #define FAN_ALL_MARK_FLAGS	(FAN_MARK_ADD |\

 				 FAN_MARK_REMOVE |\

 				 FAN_MARK_DONT_FOLLOW |\

 				 FAN_MARK_ONLYDIR |\

 				 FAN_MARK_MOUNT |\

 				 FAN_MARK_IGNORED_MASK |\

 				 FAN_MARK_IGNORED_SURV_MODIFY |\

 				 FAN_MARK_FLUSH)

 /*

  * All of the events - we build the list by hand so that we can add flags in

  * the future and not break backward compatibility.  Apps will get only the

  * events that they originally wanted.  Be sure to add new events here!

  */

 #define FAN_ALL_EVENTS (FAN_ACCESS |\

 			FAN_MODIFY |\

 			FAN_CLOSE |\

 			FAN_OPEN)

 /*

  * All events which require a permission response from userspace

  */

 #define FAN_ALL_PERM_EVENTS (FAN_OPEN_PERM |\

 			     FAN_ACCESS_PERM)

 #define FAN_ALL_OUTGOING_EVENTS	(FAN_ALL_EVENTS |\

 				 FAN_ALL_PERM_EVENTS |\

 				 FAN_Q_OVERFLOW)

 #define FANOTIFY_METADATA_VERSION	3

 struct fanotify_event_metadata {

 	__u32 event_len;

 	__u8 vers;

 	__u8 reserved;

 	__u16 metadata_len;

 	__u64 mask;

 	__s32 fd;

 	__s32 pid;

 };

 struct fanotify_response {

 	__s32 fd;

 	__u32 response;

 };

 /* Legit userspace responses to a _PERM event */

 #define FAN_ALLOW	0x01

 #define FAN_DENY	0x02

 /* No fd set in event */

 #define FAN_NOFD	-1

 /* Helper functions to deal with fanotify_event_metadata buffers */

 #define FAN_EVENT_METADATA_LEN (sizeof(struct fanotify_event_metadata))

 #define FAN_EVENT_NEXT(meta, len) ((len) -= (meta)->event_len, \

 				   (struct fanotify_event_metadata*)(((char *)(meta)) + \

 				   (meta)->event_len))

 #define FAN_EVENT_OK(meta, len)	((long)(len) >= (long)FAN_EVENT_METADATA_LEN && \

 				(long)(meta)->event_len >= (long)FAN_EVENT_METADATA_LEN && \

 				(long)(meta)->event_len <= (long)(len))

 #endif /* _LINUX_FANOTIFY_H */