trying new workaround for shutdown_pipe issue

spec/httpunix_spec.rb

@@ -25,9 +25,21 @@ class HTTPUNIXServer < WEBrick::HTTPServer
     @listeners << server
   end
 
+  # Workaround:
+  # https://bugs.ruby-lang.org/issues/10956
+  # Affecting Ruby 2.2
+  # Fix for 2.2 is at https://github.com/ruby/ruby/commit/ab0a64e1
+  # However, this doesn't work with 2.1. The following should work for both:
   def start(&block)
-    setup_shutdown_pipe
-    super.start(&block)
+    @shutdown_pipe = IO.pipe
+    shutdown_pipe = @shutdown_pipe
+    super(&block)
+  end
+
+  def cleanup_shutdown_pipe(shutdown_pipe)
+    @shutdown_pipe = nil
+    return if !shutdown_pipe
+    super(shutdown_pipe)
   end
 end