fiddle_ex.rb

require 'fiddle'

libc = Fiddle.dlopen('libc.so.6')
printf = Fiddle::Function.new(libc['printf'],
                              [Fiddle::TYPE_VOIDP],
                              Fiddle::TYPE_INT
                             )
printf.call "Hello with Fiddle::Function\n"

require 'fiddle/import'
module Stdio
        extend Fiddle::Importer
        dlload "libc.so.6"
        extern "int printf(char*)"
end
Stdio.printf "Hello with Fiddle::Importer\n"