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✏️ inotify.h

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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
 * Inode based directory notification for Linux
 *
 * Copyright (C) 2005 John McCutchan
 */

#ifndef _LINUX_INOTIFY_H
#define _LINUX_INOTIFY_H

/* For O_CLOEXEC and O_NONBLOCK */
#include <linux/fcntl.h>
#include <linux/types.h>

/*
 * struct inotify_event - structure read from the inotify device for each event
 *
 * When you are watching a directory, you will receive the filename for events
 * such as IN_CREATE, IN_DELETE, IN_OPEN, IN_CLOSE, ..., relative to the wd.
 */
struct inotify_event {
	__s32		wd;		/* watch descriptor */
	__u32		mask;		/* watch mask */
	__u32		cookie;		/* cookie to synchronize two events */
	__u32		len;		/* length (including nulls) of name */
	char		name[0];	/* stub for possible name */
};

/* the following are legal, implemented events that user-space can watch for */
#define IN_ACCESS		0x00000001	/* File was accessed */
#define IN_MODIFY		0x00000002	/* File was modified */
#define IN_ATTRIB		0x00000004	/* Metadata changed */
#define IN_CLOSE_WRITE		0x00000008	/* Writtable file was closed */
#define IN_CLOSE_NOWRITE	0x00000010	/* Unwrittable file closed */
#define IN_OPEN			0x00000020	/* File was opened */
#define IN_MOVED_FROM		0x00000040	/* File was moved from X */
#define IN_MOVED_TO		0x00000080	/* File was moved to Y */
#define IN_CREATE		0x00000100	/* Subfile was created */
#define IN_DELETE		0x00000200	/* Subfile was deleted */
#define IN_DELETE_SELF		0x00000400	/* Self was deleted */
#define IN_MOVE_SELF		0x00000800	/* Self was moved */

/* the following are legal events.  they are sent as needed to any watch */
#define IN_UNMOUNT		0x00002000	/* Backing fs was unmounted */
#define IN_Q_OVERFLOW		0x00004000	/* Event queued overflowed */
#define IN_IGNORED		0x00008000	/* File was ignored */

/* helper events */
#define IN_CLOSE		(IN_CLOSE_WRITE | IN_CLOSE_NOWRITE) /* close */
#define IN_MOVE			(IN_MOVED_FROM | IN_MOVED_TO) /* moves */

/* special flags */
#define IN_ONLYDIR		0x01000000	/* only watch the path if it is a directory */
#define IN_DONT_FOLLOW		0x02000000	/* don't follow a sym link */
#define IN_EXCL_UNLINK		0x04000000	/* exclude events on unlinked objects */
#define IN_MASK_CREATE		0x10000000	/* only create watches */
#define IN_MASK_ADD		0x20000000	/* add to the mask of an already existing watch */
#define IN_ISDIR		0x40000000	/* event occurred against dir */
#define IN_ONESHOT		0x80000000	/* only send event once */

/*
 * 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 IN_ALL_EVENTS	(IN_ACCESS | IN_MODIFY | IN_ATTRIB | IN_CLOSE_WRITE | \
			 IN_CLOSE_NOWRITE | IN_OPEN | IN_MOVED_FROM | \
			 IN_MOVED_TO | IN_DELETE | IN_CREATE | IN_DELETE_SELF | \
			 IN_MOVE_SELF)

/* Flags for sys_inotify_init1.  */
#define IN_CLOEXEC O_CLOEXEC
#define IN_NONBLOCK O_NONBLOCK

/*
 * ioctl numbers: inotify uses 'I' prefix for all ioctls,
 * except historical FIONREAD, which is based on 'T'.
 *
 * INOTIFY_IOC_SETNEXTWD: set desired number of next created
 * watch descriptor.
 */
#define INOTIFY_IOC_SETNEXTWD	_IOW('I', 0, __s32)

#endif /* _LINUX_INOTIFY_H */

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✏️ inotify.h