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> How can I run a safe sandbox from within a c/c++ application?

This is a very complex question, going far beyond setting "io" to nil.
You must begin to read that document [1], and probably others too.

For your specific question, instead of calling the default
luaL_openlibs, provide your version of it.
It is easier than "unregistering" libraries thereafter.

[1] http://lua-users.org/wiki/SandBoxes