ruby c extension example

gistfile1.rb

# gem install ffi

require "ffi"

module Libc
  extend FFI::Library
  ffi_lib 'c'
  attach_function "printf", [:string, :varargs], :int
end

Libc.printf("cputs %s %d %x", :string, "yoyo", :int, 33, :int, 34)