[BRLTTY] Low-level BrlAPI questions

[Samuel Thibault]

Hello,

About asynchronous errors returned by write, I was thinking that we
could introduce a very simple SYNC packet, that does nothing except
returning an ack, but that will actually make a round-trip between the
server and the client, i.e. receiving the ack means one has received all
asynchronous errors. Programmers can thus call it after a brlapi_write
while hacking, to make sure immediately that the write is correct. Once
the code is good, the programmer can remove it to let the write be
completely asynchronous for performance.

Samuel