Messages in this thread | | | Subject | Re: ioctl SIOCGIFADDR bug | Date | Fri, 6 Aug 1999 20:46:23 +0100 (BST) | From | Alan Cox <> |
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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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