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[lifo@null rock (master)]$ ruby extconf.rb && make
[lifo@null rock (master)]$ ruby run.rb

extconf.rb

require 'mkmf'
extension_name = 'rock'

dir_config(extension_name)
create_makefile(extension_name)

rock.c

#include "ruby.h"

VALUE method_call(VALUE self, VALUE env) {
  VALUE response = rb_ary_new();

  VALUE headers = rb_hash_new();
  rb_hash_aset(headers, rb_str_new2("Content-Type"), rb_str_new2("text/html"));
  
  rb_ary_push(response, INT2NUM(200));
  rb_ary_push(response, headers);
  rb_ary_push(response, rb_str_new2("Hello Rock"));
  return response;
}

void Init_rock() {
  VALUE Rock = rb_define_class("Rock", rb_cObject);
  rb_define_method(Rock, "call", method_call, 1);
}

run.rb

require 'rock'
require 'rubygems'
require 'rack'
require 'thin'

Rack::Handler::Thin.run Rock.new, :Port => 9292