How to cancel a Read

[AnomalRoil]

I'm using the following example:

tty, err := tty.Open()
if err != nil {
	log.Fatal(err)
}
defer tty.Close()

for {
	r, err := tty.ReadRune()
	if err != nil {
		log.Fatal(err)
	}
	// handle key event
}

which is running in a Go routine, but sadly there are cases where I don't need to wait for user input anymore (e.g. a timer elapsed) and so would love to be able to cancel the ReadRune call, since it seems to be blocking.
If I cannot cancel the Read, I have a dangling, leaked Go routine running in the background, which is annoying on a system that is running for a long time.

I've tried doing:

tty.Input().Close()

to close the underlying os.File, hoping it would cancel the Read, but it doesn't.

I also started looking into https://pkg.go.dev/os#File.SetReadDeadline but since it seems that the os.Open("/dev/tty") is not recognized as a type on which we can set a Deadline as it errors out with "file type does not support deadline".

So here am I: how can I cancel a ReadRune in a Go routine while it is waiting for user input ?

[ZenLiuCN]

go func(ch chan rune){ 
for{
	r, err := tty.ReadRune()
	if err != nil {
		return
	}
ch <-r
}}(ch)
//handle
for c:=range ch{
//handle
}
//timeout 
tty.Close()
	

[fess932]

same? #50