[uml-devel] stdio_console, chan, tty questions

[Boria F. <bo...@qu...>]

Hi
i still can't get my head round what's going on in stdio_console, chan and
tty code.
So several questions about it:

o The only place where the code might be referring to a tty is the code from
stdio_console.c which deals with vts[0], which on the chan level looks like two
chan structs for input and output. Is that correct ?

o So to save the state of that tty, one would need to put something like
if(isatty(chan->fd)) save_tty_state_attrs();
into open_fd, which would perhaps introduce a slight perfomance problem, 
as only a very small fraction of the fd's will refer to a tty.

o I couldn't find the code that closes fd's which chan opens, i'm assuming this
is done automagically. In that case, the only way to restore terminal settings which
i could find was to introduce something like a chan_close() and chan_pair_close() 
functions, which would be called by con_close() to restore the state of a tty.

Am i going in the right direction?

TIA
boria