Generate code in C

I've got a library in C that I'd like to generate bindings for in Elisp. In Ruby, I'd simply include a header and then use its C API to generate functions and so on. Can I do the same on elisp? describe-function often says that a function is in "C source code". How are these generated?

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You can check this Emacs doc to see how to wrap C function into a DEFUN macro to make it accessible from Emacs.

Once primitives are defined you need to recompile Emacs, you cannot load them dynamically in the runtime.