IFM_STATUS_DESC(ifms, bit)

in net/if_media.h should do what you need.

And the ioctl you need is SIOCGIFMEDIA.



On 04/03/2013 03:50 PM, Robert Murrell wrote:
> How do I programmatically detect if the Ethernet cable has been unplugged?  I tried the ioctl SIOCGIFFLAGS command to 
look at the IFF_UP and IFF_RUNNING flags, but these are always set.  ifconfig seems to know because when the cable is 
plugged in, it displays:
>
>    status: active
>
> Since the source code is nearly impossible to access, I can't see how it knows.  Does anyone know the magic function 
to determine this?
>
>
>
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