Function forceExitAfter3TerminationSignals

cmd/docker/docker.go:447–463

forceExitAfter3TerminationSignals waits for the first termination signal to be caught and the context to be marked as done, then registers a new signal handler for subsequent signals. It forces the process to exit after 3 SIGTERM/SIGINT signals.

(ctx context.Context, streams command.Streams)

// signal handler for subsequent signals. It forces the process to exit
// after 3 SIGTERM/SIGINT signals.
func forceExitAfter3TerminationSignals(ctx context.Context, streams command.Streams) {
	// wait for the first signal to be caught and the context to be marked as done
	<-ctx.Done()
	// register a new signal handler for subsequent signals
	sig := make(chan os.Signal, 2)
	signal.Notify(sig, platformsignals.TerminationSignals...)

	// once we have received a total of 3 signals we force exit the cli
	for range 2 {
		<-sig
	}
	_, _ = fmt.Fprint(streams.Err(), "\ngot 3 SIGTERM/SIGINTs, forcefully exiting\n")

	// Restore terminal in case it was in raw mode.
	restoreTerminal(streams)
	os.Exit(1)
}

// restoreTerminal restores the terminal if it was in raw mode; this prevents
// local echo from being disabled for the current terminal after forceful