fiddle_hacks.rb

# Fiddle, passing a pointer to an int.  This gets the current process command

    module Hacks
      include Fiddle

      func = "_NSGetExecutablePath"
      path_ptr = Fiddle::Handle::DEFAULT[func]
      path = Function.new path_ptr, [TYPE_VOIDP, TYPE_INTPTR_T], TYPE_INT, name: func
      define_singleton_method(func, &path.to_proc)

      func_name = "_dyld_image_count"
      ptr = Fiddle::Handle::DEFAULT[func_name]
      func = Function.new ptr, [], TYPE_INT32_T, name: func_name
      define_singleton_method(func_name, &func.to_proc)

      func_name = "_dyld_get_image_name"
      ptr = Fiddle::Handle::DEFAULT[func_name]
      func = Function.new ptr, [TYPE_INT32_T], TYPE_CONST_STRING, name: func_name
      define_singleton_method(func_name, &func.to_proc)

      func_name = "_dyld_get_image_vmaddr_slide"
      ptr = Fiddle::Handle::DEFAULT[func_name]
      func = Function.new ptr, [TYPE_INT32_T], TYPE_INTPTR_T, name: func_name
      define_singleton_method(func_name, &func.to_proc)

      def self.executable
        str = Fiddle::Pointer.malloc(256, Fiddle::RUBY_FREE)
        int = Fiddle::Pointer.malloc(Fiddle::SIZEOF_INT32_T, Fiddle::RUBY_FREE)
        int[0, 4] = [256].pack("L")

        if _NSGetExecutablePath(str, int) == 0
          str[0, 256].unpack1("Z*")
        end
      end
    end