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SubjectRe: ioctl SIOCGIFADDR bug
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> My problem turns out to be an apparently undocumented requirement that the
> family type must be set in the buffer for SIOCGIFADDR to work (but not for
> the mask or broadcast commands to work) and if you don't (i.e. all bytes 0)
> it will return the last four bytes of the network card's MAC address but set
> this byte (the 18th, at offset 17) to 1 which will cause it to work the
> next time.

It returns the entire MAC address if you dont. The world has been that way
since 4.2 BSD at least.

Alan


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