https://docs.racket-lang.org/foreign/index.html
Looking at Julia (Which has a no "boiler plate" philosophy when using C or Fortan) the function is just called.
Interesting to look at for comparison
Julia ccall- https://docs.julialang.org/en/v0.6.1/manual/calling-c-and-fo...
Racket FFI - https://docs.racket-lang.org/foreign/index.html