1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2 /*
3  * Inode based directory notification for Linux
4  *
5  * Copyright (C) 2005 John McCutchan
6  */
7 
8 #ifndef _UAPI_LINUX_INOTIFY_H
9 #define _UAPI_LINUX_INOTIFY_H
10 
11 /* For O_CLOEXEC and O_NONBLOCK */
12 #include <linux/fcntl.h>
13 #include <linux/types.h>
14 
15 /*
16  * struct inotify_event - structure read from the inotify device for each event
17  *
18  * When you are watching a directory, you will receive the filename for events
19  * such as IN_CREATE, IN_DELETE, IN_OPEN, IN_CLOSE, ..., relative to the wd.
20  */
21 struct inotify_event {
22 	__s32		wd;		/* watch descriptor */
23 	__u32		mask;		/* watch mask */
24 	__u32		cookie;		/* cookie to synchronize two events */
25 	__u32		len;		/* length (including nulls) of name */
26 	char		name[];	/* stub for possible name */
27 };
28 
29 /* the following are legal, implemented events that user-space can watch for */
30 #define IN_ACCESS		0x00000001	/* File was accessed */
31 #define IN_MODIFY		0x00000002	/* File was modified */
32 #define IN_ATTRIB		0x00000004	/* Metadata changed */
33 #define IN_CLOSE_WRITE		0x00000008	/* Writtable file was closed */
34 #define IN_CLOSE_NOWRITE	0x00000010	/* Unwrittable file closed */
35 #define IN_OPEN			0x00000020	/* File was opened */
36 #define IN_MOVED_FROM		0x00000040	/* File was moved from X */
37 #define IN_MOVED_TO		0x00000080	/* File was moved to Y */
38 #define IN_CREATE		0x00000100	/* Subfile was created */
39 #define IN_DELETE		0x00000200	/* Subfile was deleted */
40 #define IN_DELETE_SELF		0x00000400	/* Self was deleted */
41 #define IN_MOVE_SELF		0x00000800	/* Self was moved */
42 
43 /* the following are legal events.  they are sent as needed to any watch */
44 #define IN_UNMOUNT		0x00002000	/* Backing fs was unmounted */
45 #define IN_Q_OVERFLOW		0x00004000	/* Event queued overflowed */
46 #define IN_IGNORED		0x00008000	/* File was ignored */
47 
48 /* helper events */
49 #define IN_CLOSE		(IN_CLOSE_WRITE | IN_CLOSE_NOWRITE) /* close */
50 #define IN_MOVE			(IN_MOVED_FROM | IN_MOVED_TO) /* moves */
51 
52 /* special flags */
53 #define IN_ONLYDIR		0x01000000	/* only watch the path if it is a directory */
54 #define IN_DONT_FOLLOW		0x02000000	/* don't follow a sym link */
55 #define IN_EXCL_UNLINK		0x04000000	/* exclude events on unlinked objects */
56 #define IN_MASK_CREATE		0x10000000	/* only create watches */
57 #define IN_MASK_ADD		0x20000000	/* add to the mask of an already existing watch */
58 #define IN_ISDIR		0x40000000	/* event occurred against dir */
59 #define IN_ONESHOT		0x80000000	/* only send event once */
60 
61 /*
62  * All of the events - we build the list by hand so that we can add flags in
63  * the future and not break backward compatibility.  Apps will get only the
64  * events that they originally wanted.  Be sure to add new events here!
65  */
66 #define IN_ALL_EVENTS	(IN_ACCESS | IN_MODIFY | IN_ATTRIB | IN_CLOSE_WRITE | \
67 			 IN_CLOSE_NOWRITE | IN_OPEN | IN_MOVED_FROM | \
68 			 IN_MOVED_TO | IN_DELETE | IN_CREATE | IN_DELETE_SELF | \
69 			 IN_MOVE_SELF)
70 
71 /* Flags for sys_inotify_init1.  */
72 #define IN_CLOEXEC O_CLOEXEC
73 #define IN_NONBLOCK O_NONBLOCK
74 
75 /*
76  * ioctl numbers: inotify uses 'I' prefix for all ioctls,
77  * except historical FIONREAD, which is based on 'T'.
78  *
79  * INOTIFY_IOC_SETNEXTWD: set desired number of next created
80  * watch descriptor.
81  */
82 #define INOTIFY_IOC_SETNEXTWD	_IOW('I', 0, __s32)
83 
84 #endif /* _UAPI_LINUX_INOTIFY_H */
85