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The OSX command line tool nettop (I think it was added with Lion) can display per app network throughput without requiring root privileges. I browsed through the Darwin source code on http://www.opensource.apple.com/ but couldn’t find it’s source code. Is it open source at all or did I just missed it. Incase the source is not publicly available, does anyone have an idea via which api nettop is getting its data?
nettopis open source only in its BSD version, but Apple’s version uses their privateNetworkStatisticsframework (new in Lion) so I doubt you will find the sources since Apple tends to not release private code.