Windows - Process keeps running when stdin is set

[powellnorma]

The following works fine:

func runPsCmd(psCmd string) {
	pthPs := `C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe`

	cmd := exec.Command(pthPs, "-Command", psCmd)

	cmd.Stderr = os.Stderr
	cmd.Stdout = os.Stdout
	cmd.Stdin = os.Stdin

	err := cmd.Start()
	if err != nil {
		panic(err)
	}

	err = cmd.Wait()
	if err != nil {
		exitError, ok := err.(*exec.ExitError)
		if ok {
			os.Exit(exitError.ExitCode())
		} else {
			panic(err)
		}
	}
	os.Exit(0)
}

func main() {
	runPsCmd("echo myTest")
}

However when doing the same but with:

func runPsCmd(s ssh.Session, psCmd string) {
	// [..]
	cmd.Stderr = s
	cmd.Stdout = s
	cmd.Stdin = s
	// [..]
}

cmd.Wait() blocks until I pressed Enter once. When I don't assign cmd.Stdin at all, it works as expected, but some programs may require user input. What could this by caused by? And how can this be fixed?