Function handleSignals

signal.go:39–65

handleSignals function creates and listens on OS signals channel. OS-specific signals that correspond to the program termination (SIGTERM, SIGHUP, SIGINT) will cause this function to return. SIGUSR1 will call reinitLogging without returning.

()

//
// SIGUSR1 will call reinitLogging without returning.
func handleSignals() (reload bool) {
	sig := make(chan os.Signal, 5)
	signal.Notify(sig, os.Interrupt, syscall.SIGTERM, syscall.SIGHUP, syscall.SIGINT, syscall.SIGUSR1, syscall.SIGUSR2)
	defer signal.Stop(sig)

	for {
		switch s := <-sig; s {
		case syscall.SIGUSR1:
			log.Printf("signal received (%s), rotating logs", s.String())
			systemdStatus(SDReloading, "Reopening logs...")
			hooks.RunHooks(hooks.EventLogRotate)
			systemdStatus(SDReady, "Listening for incoming connections...")
		case syscall.SIGUSR2:
			log.Printf("signal received (%s), reloading configuration", s.String())
			return true
		default:
			go func() {
				s := handleSignals()
				log.Printf("forced shutdown due to signal (%v)!", s)
				os.Exit(1)
			}()

			log.Printf("signal received (%v), next signal will force immediate shutdown.", s)
			return false
		}
	}
}