Messages in this thread | | | Date | Fri, 6 Aug 1999 21:11:36 +0100 (GMT) | From | Riley Williams <> | Subject | Re: ioctl SIOCGIFADDR bug |
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Hi Alan.
>> 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.
Presumably his MAC address starts with 00:00 and he didn't notice the difference as a result...
Best wishes from Riley.
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