How to catch the ctrl-c keystroke in a Scala command line application

/**
  * The ability to cancel this code with `ctrl-c` inside of 
  * sbt requires you to have this setting in build.sbt:
  * 
  *     fork in run := true
  */
object SlowSocketServer extends App {
    val serverResponseDelayTimeMs = 0
    val serverPort = 5150

    Runtime.getRuntime().addShutdownHook(new Thread {
        override def run = {
            System.out.println("Shutdown hook ran")
            // if (socket != null) socket.close()
            Thread.sleep(1000)
        }
    })
    
    // more code here ...