Event notification when sysfs attribute changes

[Rick L. Vinyard, Jr.]

I'd like to allow userspace applications to track and display state
changes (without polling) in a driver that exports attributes via sysfs.

What is the best way to notify userspace applications when a sysfs
exported attribute changes?

In particular I wanted to drive the notification in the *_store() function
of the sysfs attribute.

Also, ideally, the mechanism would allow multiple userspace applications
to hook into the notification.

Thanks,

Rick


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