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 _LINUX_INOTIFY_H
9#define _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 */
21struct 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 /* Writable file was closed */
34#define IN_CLOSE_NOWRITE 0x00000010 /* Unwritable 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 /* _LINUX_INOTIFY_H */