Demo of DispatchSourceSignal for handling interrupts

DispatchSourceInterrupt.swift

import Darwin.C
import Dispatch

signal(SIGINT, SIG_IGN)

let source = DispatchSource.makeSignalSource(signal: SIGINT, queue: .main)

var count = 0

source.setEventHandler {
  count += 1
  print("Interrupted \(count) times.")

  if count == 3 {
    exit(0)
  }
}

source.resume()

dispatchMain()