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Inotify constants usable with inotify_add_watch and/or returned by inotify_read

File was accessed (read) (*)

Predefined Constants Constants

IN_ACCESS (int)

File was accessed (read) (*)

IN_MODIFY (int)

File was modified (*)

IN_ATTRIB (int)

Metadata changed (e.g. permissions, mtime, etc.) (*)

IN_CLOSE_WRITE (int)

File opened for writing was closed (*)

IN_CLOSE_NOWRITE (int)

File not opened for writing was closed (*)

IN_OPEN (int)

File was opened (*)

IN_MOVED_TO (int)

File moved into watched directory (*)

IN_MOVED_FROM (int)

File moved out of watched directory (*)

IN_CREATE (int)

File or directory created in watched directory (*)

IN_DELETE (int)

File or directory deleted in watched directory (*)

IN_DELETE_SELF (int)

Watched file or directory was deleted

IN_MOVE_SELF (int)

Watch file or directory was moved

IN_CLOSE (int)

Equals to IN_CLOSE_WRITE | IN_CLOSE_NOWRITE

IN_MOVE (int)

Equals to IN_MOVED_FROM | IN_MOVED_TO

IN_ALL_EVENTS (int)

Bitmask of all the above constants

IN_UNMOUNT (int)

File system containing watched object was unmounted

IN_Q_OVERFLOW (int)

Event queue overflowed (wd is -1 for this event)

IN_IGNORED (int)

Watch was removed (explicitly by inotify_rm_watch() or because file was removed or filesystem unmounted

IN_ISDIR (int)

Subject of this event is a directory

IN_ONLYDIR (int)

Only watch pathname if it is a directory (Since Linux 2.6.15)

IN_DONT_FOLLOW (int)

Do not dereference pathname if it is a symlink (Since Linux 2.6.15)

IN_MASK_ADD (int)

Add events to watch mask for this pathname if it already exists (instead of replacing mask).

IN_ONESHOT (int)

Monitor pathname for one event, then remove from watch list.

Note

The events marked with an asterisk (*) above can occur for files in watched directories.

Source: reference/inotify/constants.xml · from the official PHP manual (php/doc-en)