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<Inotify Functionsinotify_init>
^Inotify FunctionsLast updated: Mon, 26 Oct 2026

inotify_add_watch

(PECL inotify >= 0.1.2)

inotify_add_watch — Add a watch to an initialized inotify instance

Description

function inotify_add_watch(resource $inotify_instance, string $pathname, int $mask): int|false

inotify_add_watch() adds a new watch or modify an existing watch for the file or directory specified in pathname.

Using inotify_add_watch() on a watched object replaces the existing watch. Using the IN_MASK_ADD constant adds (OR) events to the existing watch.

Parameters

inotify_instance

Resource returned by inotify_init()

pathname

File or directory to watch

mask

Events to watch for. See Predefined Constants.

Return Values

The return value is a unique (inotify instance wide) watch descriptor, or false on failure.

See Also


<Inotify Functionsinotify_init>
^Inotify FunctionsLast updated: Mon, 26 Oct 2026