Re: [Qemu-devel] curses.c: "We need a terminal output" ?

[Laszlo Ersek]

On 04/16/19 09:24, Gerd Hoffmann wrote:
> On Mon, Apr 15, 2019 at 03:10:09PM -0400, John Snow wrote:
>> <CC'ing curses maintainer>
>>
>> On 4/13/19 5:02 AM, Joachim Durchholz wrote:
>>> Hi all,
>>>
>>> what's the reasoning behind "We need a terminal output" in curses.c?
> 
> curses needs a terminal.
> 
>>> I don't really see a scenario where it's problematic if qemu emits
>>> escape sequences to a pipe.
> 
> It's not about sending escape sequences.  A pipe simply doesn't support
> all the tty ioctls (query terminal size, turn echo on/off, set all kinds
> of terminal modes, ...).

(

Indeed, it's called the "General Terminal Interface".

http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap11.html

)

>>> I can see another scenario when this is problematic: Unit testing code
>>> that directly writes to the console. E.g. testing BIOS code, or testing
>>> operating systems when using the serial port is not an option.
> 
> seabios can work with the serial console just fine, try "qemu -nographic"
> 
> cheers,
>   Gerd
> 
>