With Unikraft as being a librarized unikernel system you can actually choose if the OS layer should provide you a network stack (likely written in C/C++) for yo

With Unikraft as being a librarized unikernel system you can actually choose if the OS layer should provide you a network stack (likely written in C/C++) for your runtime or if you prefer doing it in a higher-level language. Similar to this the MirageOS folks developed a network stack in OCaml.