[BRLTTY] screen driver in brlapi

[Nicolas Pitre]

On Mon, 12 Nov 2018, Tage Johansson wrote:

> How ever, I have still one question.
> 
> Revents is allways set to 10. Wich means that both the POLLPRI and POLLERR
> flags are set.
> 
> Why is the POLLERR flag set? Is there still a problem with my code?

No, this is expected. Because /dev/vcsa is not a real stream device, the 
poll() semantics are stretched a bit beyond its formal POSIX definition. 
All kernel interfaces that aren't actual data stream you may poll() will 
return with POLLPRI|POLLERR bits set when changes to the existing data 
occur.


Nicolas