From owner-freebsd-hackers@FreeBSD.ORG  Fri Aug 11 17:54:31 2006
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From: "Johnny Choque" <jchoque@tlmat.unican.es>
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Date: Fri, 11 Aug 2006 19:56:27 +0200
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Subject: Attach/detach devices
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Hi,

I'm trying to do a userland program that detect the event when a device is
attached/detached. In particular, I would like to detect these events for
wireless pc card insertion/ejection or when tear down the connection of the
wireless interface build-in laptop. I've found that functions
device_attach/device_detach are used by the kernel when a device is
attached/detached respectively, and, e.g, when a device is detached "a
notification event is sent to userland for user-based device management
service", how can I use that notification event in my userland program?
Could you give me some ideas to do my program?

Cheers,

Johnny