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Well, if you want to cheat you could use exec() to run 'ifconfig eth0 > foo.txt' and then parse the foo.txt file
Another way is to use the functions in resolv.h that are meant for DNS querying. I don't remember off the top of my head exactly how to do it, but that at least points you in the right direction.
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0:9E:C6:02:91 * eth1
