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Look at SIOCGIFADDR for getting ip address. You can also look at /usr/include/bits/ioctls.h to see more options you can get and set. Also look in /usr/include/linux/if.h for the other structs you can use to get more information (like struct ifreq).
ioctl() is confusing but there's alot of really cool stuff you can do.
Hmm. I did try ioctl(s, SIOCGIFADDR, &buffer) after the one to get the MAC address (after saving ifr_hwaddr.sa_data, of course), but ifr_addr.sa_data contains the MAC address, as well, and not the ip. Do I have to zero the contents of buffer before every ioctl call?
<Snicker> I shoulda have seen that myself, really, but apprently I am so insecure about moving in the new (for me, that is) Linux world that I can't see the obvious.. My biggest problem is definitely having no concise reference of the tools available with Linux (strace?).
Just as people say: "Linux is only free if your time has no value"