Graceful Cleanup                                                                      
                                                                                                    
                                                                                                    
                                                                                                    
                                                                                       Close sockets
                                                                                                    
                                                                                                    
                                                                                                    
                                                                                                    
                                                                      Do other things               
                                                                                                    
                                                                                                    
                                                                                                    
                                                                                                    
                                                                                                    
                                                                                     Log shutdown