> Hello,
>
> I'll be concise: I am writing some user-space code that needs to
> obtain the IPv4 protocol address and hardware address from an interface
> (arbitrary). I am using the ioctl() method with SIOCGIFHWADDR and
> SIOCGIFADDR, operating on struct ifreq (contains struct sockaddr). The
> hardware address part works like I expect. But the IP address doesn't;
> it's stored in sa_data, offset two bytes. I don't understand why. Here is
> a code pseudo-fragment:
The result of SIOCGIFADDR is a struct sockaddr, or for an INET socket a
struct sockaddr_in, which has an (unused) port number at the front.
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