linux-kernel - Event notification when sysfs attribute changes

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Message-ID: <40c00347a27f37e06686be80de0adcf6.squirrel@intranet.cs.nmsu.edu>
Date:	Wed, 12 Aug 2009 08:26:45 -0600
From:	"Rick L. Vinyard, Jr." <rvinyard@...nmsu.edu>
To:	"Linux USB" <linux-usb@...r.kernel.org>,
	"LKML" <linux-kernel@...r.kernel.org>
Subject: Event notification when sysfs attribute changes

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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