Snippet showing how to catch common interrupts and use the HUP signal to reload your config on the fly. Note that you can not catch SIGKILL so we don't even try.

sigcatch.go

c := make(chan os.Signal, 1)
signal.Notify(c)
go func() {
	for sig := range c {
		switch sig {
		case syscall.SIGHUP:
			fmt.Println("Reloading config")
			if err := parseConfig(); err != nil {
				fmt.Println("Error parsing config")
				fmt.Println(err)
			}

		case syscall.SIGTERM:
			os.Exit(1) // Error becuase we were killed

		case syscall.SIGINT:
			// Do stuff and gracefully shutdown
			os.Exit(0)
		}
	}
}()