cregit-Linux how code gets into the kernel

Release 4.7 include/uapi/linux/fanotify.h

#ifndef _UAPI_LINUX_FANOTIFY_H

#define _UAPI_LINUX_FANOTIFY_H

#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;
	
__aligned_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 /* _UAPI_LINUX_FANOTIFY_H */

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