Poll the nic on the sampler's cadence, and reboot rather than exit when a clean return reaches PID 1

main.go

@@ -535,6 +535,14 @@ func main() {
 	if err := run(*aName, *bName, *nsPerM); err != nil {
 		panic(err)
 	}
+	// A clean return is ctrl-alt-delete, which the kernel hands PID 1 as a
+	// SIGINT. Exiting on it would panic the kernel over the reboot it was asking
+	// for, so init asks for the reboot by name.
+	if os.Getpid() == 1 {
+		if err := unix.Reboot(unix.LINUX_REBOOT_CMD_RESTART); err != nil {
+			panic(err)
+		}
+	}
 }
 
 const (