Re: Custom boot loader stub

On Fri, Oct 24, 2025 at 17:49:30 +0100, Sad Clouds wrote:

> On Fri, 24 Oct 2025 14:30:17 +0300 Valery Ushakov <[email protected]> wrote:
>
> > From a quick look I'd venture a guess that you might want to use
> > poll-tty first, before calling read to read the data that you now know
> > is there.
>
> Thanks for the pointers. I've just realised the solution was right
> there in front of me in Illumos prom_getchar(). My brain didn't quite
> register that it was polling for input in a while loop.
> 
> This is what I should have done:
> 
> char ofw_read_stdin_char(void)
> {
> 	int64_t i64;
> 	char    c;
> 
> 	do
> 	{
> 		/* Continually returns -2 while no data is ready on stdin */
> 		i64 = ofw_read_stdin(&c, 1);
> 	} while (i64 == -2);

poll-tty seems nicer, as it handles e.g. abort on break.


-uwe