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Current File : /usr/include/linux//fanotify.h
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef _LINUX_FANOTIFY_H
#define _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_ATTRIB		0x00000004	/* Metadata changed */
#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_MOVED_FROM		0x00000040	/* File was moved from X */
#define FAN_MOVED_TO		0x00000080	/* File was moved to Y */
#define FAN_CREATE		0x00000100	/* Subfile was created */
#define FAN_DELETE		0x00000200	/* Subfile was deleted */
#define FAN_DELETE_SELF		0x00000400	/* Self was deleted */
#define FAN_MOVE_SELF		0x00000800	/* Self was moved */
#define FAN_OPEN_EXEC		0x00001000	/* File was opened for exec */

#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_OPEN_EXEC_PERM	0x00040000	/* File open/exec in perm check */

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

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

/* helper events */
#define FAN_CLOSE		(FAN_CLOSE_WRITE | FAN_CLOSE_NOWRITE) /* close */
#define FAN_MOVE		(FAN_MOVED_FROM | FAN_MOVED_TO) /* moves */

/* flags used for fanotify_init() */
#define FAN_CLOEXEC		0x00000001
#define FAN_NONBLOCK		0x00000002

/* These are NOT bitwise flags.  Both bits are used together.  */
#define FAN_CLASS_NOTIF		0x00000000
#define FAN_CLASS_CONTENT	0x00000004
#define FAN_CLASS_PRE_CONTENT	0x00000008

/* Deprecated - do not use this in programs and do not add new flags here! */
#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_ENABLE_AUDIT	0x00000040

/* Flags to determine fanotify event format */
#define FAN_REPORT_TID		0x00000100	/* event->pid is thread id */
#define FAN_REPORT_FID		0x00000200	/* Report unique file id */
#define FAN_REPORT_DIR_FID	0x00000400	/* Report unique directory id */
#define FAN_REPORT_NAME		0x00000800	/* Report events with name */

/* Convenience macro - FAN_REPORT_NAME requires FAN_REPORT_DIR_FID */
#define FAN_REPORT_DFID_NAME	(FAN_REPORT_DIR_FID | FAN_REPORT_NAME)

/* Deprecated - do not use this in programs and do not add new flags here! */
#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
/* FAN_MARK_MOUNT is		0x00000010 */
#define FAN_MARK_IGNORED_MASK	0x00000020
#define FAN_MARK_IGNORED_SURV_MODIFY	0x00000040
#define FAN_MARK_FLUSH		0x00000080
/* FAN_MARK_FILESYSTEM is	0x00000100 */

/* These are NOT bitwise flags.  Both bits can be used togther.  */
#define FAN_MARK_INODE		0x00000000
#define FAN_MARK_MOUNT		0x00000010
#define FAN_MARK_FILESYSTEM	0x00000100

/* Deprecated - do not use this in programs and do not add new flags here! */
#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)

/* Deprecated - do not use this in programs and do not add new flags here! */
#define FAN_ALL_EVENTS (FAN_ACCESS |\
			FAN_MODIFY |\
			FAN_CLOSE |\
			FAN_OPEN)

/*
 * All events which require a permission response from userspace
 */
/* Deprecated - do not use this in programs and do not add new flags here! */
#define FAN_ALL_PERM_EVENTS (FAN_OPEN_PERM |\
			     FAN_ACCESS_PERM)

/* Deprecated - do not use this in programs and do not add new flags here! */
#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;
};

#define FAN_EVENT_INFO_TYPE_FID		1
#define FAN_EVENT_INFO_TYPE_DFID_NAME	2
#define FAN_EVENT_INFO_TYPE_DFID	3

/* Variable length info record following event metadata */
struct fanotify_event_info_header {
	__u8 info_type;
	__u8 pad;
	__u16 len;
};

/*
 * Unique file identifier info record.
 * This structure is used for records of types FAN_EVENT_INFO_TYPE_FID,
 * FAN_EVENT_INFO_TYPE_DFID and FAN_EVENT_INFO_TYPE_DFID_NAME.
 * For FAN_EVENT_INFO_TYPE_DFID_NAME there is additionally a null terminated
 * name immediately after the file handle.
 */
struct fanotify_event_info_fid {
	struct fanotify_event_info_header hdr;
	__kernel_fsid_t fsid;
	/*
	 * Following is an opaque struct file_handle that can be passed as
	 * an argument to open_by_handle_at(2).
	 */
	unsigned char handle[0];
};

struct fanotify_response {
	__s32 fd;
	__u32 response;
};

/* Legit userspace responses to a _PERM event */
#define FAN_ALLOW	0x01
#define FAN_DENY	0x02
#define FAN_AUDIT	0x10	/* Bit mask to create audit record for result */

/* 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 */

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