Can I get the names of all the domains a Linux computer is connected to in C++?

I have a Linux machine that is connected (by external NICs) to 2 external domains. I want to get the names of the domains my machine is connected to programmatically using C++. How can I get all these names in my application?

By the way, I have already tried getnameinfo, and it doesn't work for me.开发者_开发技巧 So please suggest another answer.

Also, it would be more helpful to me if your answers included sample code.

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