The FSEvents API in macOS allows applications to register for notifications of changes to a given directory tree. Whenever the filesystem is changed, the kernel passes notifications via the special device file /dev/fsevents to a userspace process called fseventsd.
The FSEvents API in macOS allows applications to register for notifications of changes to a given directory tree. Whenever the filesystem is changed, the kernel passes notifications via the special device file /dev/fsevents to a userspace process called fseventsd.
Source: Wikipedia "FSEvents" · CC BY-SA 4.0
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