Peter Maydell <peter.mayd...@linaro.org> writes: > On 26 September 2012 09:17, Michael Tokarev <m...@tls.msk.ru> wrote: >> On 26.09.2012 12:00, Peter Maydell wrote: >> >>>> I know lots of people use -nographic -daemonize to run headless >>>> guests in background (like, for example, a router). I guess it >>>> come way before -vga option has been introduced, but at least I >>>> know about -vga (but not about -vga none). For one, I never saw >>>> -display before. And it looks like -nographic is a synonym for >>>> -display none, and -curses is a synonym for -display curses. >> >> I mean, -nographic is about the same as -vga none -display none. > > ...except that it *also* messes around with where the serial output > goes and with the parallel port and maybe something else. > >> What is equivalent of -nographic in terms of -vga/-display/-...? >> From the code it is something like >> >> -vga none -display none -serial mon:stdio -parallel null > > It's something like that. It would be nice to implement -nographic > as "this is an alias for ...." but IIRC it isn't quite doable. > (maybe I misremember) > >> (this is the code I tried to patch). >> >> Note: this, compbined with -daemonize, also has the same issue, >> namely, the tty is left in a bad state after qemu process backgrounded, >> and for the very same reason: -serial stdio switches the try into >> raw mode. So this should be fixed too -- somehow, either by forbidding >> this combination completely or by silently substituting stdio for >> -serial with null. But it will be done in a subsequent patch. >> >> Note also: by forbidding -nographic -daemonize, we'll break lots of >> existing setups too, and I still don't see why this combination is >> bad, I already demonstrated that it can be made to work in a more >> or less reasonable/expected way. > > Because you've asked both "put me into the background" and "please > send stuff to stdio". Admittedly you've probably done that because > you didn't really understand that '-nographic' doesn't mean > '-display none', but you've still asked for a nonsensical combination.
This is a good example of where we need improved documentation but I agree 100% with Peter. Regards, Anthony Liguori > > -- PMM
