func main() { // interrupt context after 500ms ctx, cancel := context.WithTimeout(context.Background(), 500*time.Millisecond) defer cancel() // interrupt context with SIGTERM (CTRL+C) sigs := make(chan os.Signal, 1) signal.Notify(sigs, os.Interrupt) go func() { <-sigs cancel()	}() f, err := os.OpenFile(os.DevNull, os.O_WRONLY, 0) if err != nil { log.Fatal(err)	} defer f.Close() // Writer that fails when context is canceled out := contextio.NewWriter(ctx, f) // Infinite loop. Will only be interrupted once write fails. for { if _, err := out.Write([]byte{'a', 'b', 'c'}); err != nil { fmt.Println("Err:", err) break	}	} fmt.Println("Closing.") }