Physical link notification

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Hi,

Is there any way I can detect whether 
the physical link is connected to the
network device. 

That is when the ethernet cable is removed
from the network card a userland call back
function should be invoked.
Is there any such provision existing already for this.

If there is no userland method
is there a way to detect this from the
driver code of say 8139 driver ?

Thanks in advance.
Regards
KK


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