[BRLTTY] Virtual driver is not reading the socket

[Jaroslav Skarvada]

----- Original Message -----
> Hi,
> 
> for me the Virtual driver (vr) doesn't work, reproducer:
> 
> $ brltty -b vr -d server:127.0.0.1 -x a2 -A auth=none
> $ telnet 127.0.0.1 35752
> cells 20
> 
> And nothing happened. It seems the 'vr' driver thinks there is
> no data on the socket received, i.e. the awaitSocketInput check in
> readNetworkSocket never succeed.
> 
> I didn't debug the complex underlying machinery, but the attached
> patch that bypassed it and used MSG_DONTWAIT recv flag (which is
> available since kernel 2.2) works for me and the Virtual driver
> started to work again. I tested it on Fedora 23 (kernel 4.4.7)
> 
> thanks & regards
> 
> Jaroslav
> 

I bisected the problem to the following commit:
https://github.com/brltty/brltty/commit/cd62215b643b486c93fb28c3fe02e3727cdf3f91

and simply reverting the commit for the asyncAwaitCondtition resolved the problem
for me

regards

Jaroslav
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