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    SubjectRe: ioctl SIOCGIFADDR bug
    > 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.


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