时间限制后取消从io.Reader读取的输入

Question

I am wondering how to cancel an input read after a timer expires. I am currently reading from input with

fmt.Fscanln(reader, &var)

I have a channel that will be filled with a value as soon as the timer expires. I currently have the scan happening on a different go routine. This way, the function that scan's will return when it runs out of time.

The problem is if the io.Reader passed to fmt.Fscanln is reading from stdin, it will still wait for input after its goroutine is over. Is there a way to cancel the read if time expires?

Thanks!