unlink UNIXSocket files, fix Binder#close (#1970)

lib/puma/binder.rb

@@ -50,14 +50,6 @@ def env(sock)
 
     def close
       @ios.each { |i| i.close }
-      @unix_paths.each do |i|
-        # Errno::ENOENT is intermittently raised
-        begin
-          unix_socket = UNIXSocket.new i
-          unix_socket.close
-        rescue Errno::ENOENT
-        end
-      end
     end
 
     def import_from_env
@@ -431,6 +423,10 @@ def close_listeners
       end
     end
 
+    def close_unix_paths
+      @unix_paths.each { |up| File.unlink(up) if File.exist? up }
+    end
+
     def redirects_for_restart
       redirects = {:close_others => true}
       @listeners.each_with_index do |(l, io), i|

lib/puma/cluster.rb

@@ -527,6 +527,7 @@ def run
         @suicide_pipe.close
         read.close
         @wakeup.close
+        @launcher.close_binder_unix_paths
       end
     end
 

lib/puma/launcher.rb

@@ -220,6 +220,10 @@ def close_binder_listeners
       @binder.close_listeners
     end
 
+    def close_binder_unix_paths
+      @binder.close_unix_paths
+    end
+
     private
 
     def reload_worker_directory

lib/puma/single.rb

@@ -118,6 +118,7 @@ def run
       rescue Interrupt
         # Swallow it
       end
+      @launcher.close_binder_unix_paths
     end
   end
 end