It often does use libc. OP's article mentioned that they're using it more on Darwin now, but they've also been using it on Linux for a long time to do some of t

It often does use libc. OP's article mentioned that they're using it more on Darwin now, but they've also been using it on Linux for a long time to do some of their DNS resolution (where implementing a stable parser for /etc/resolv.conf and friends is nobody's idea of a good time). I don't have an authoritative source, but I think one of the big downsides of CGO for them is that it hurts their cross-compilation story. Cross-compiling a pure Go program is trivial, which is great, but by default it disables CGO.