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    SubjectRe: [PATCH] Console: fall back to /dev/null when no console is availlable
    On Wed, 6 Oct 2004, [iso-8859-1] Jörn Engel wrote:
    > On Wed, 6 October 2004 16:23:27 +0200, Geert Uytterhoeven wrote:
    > > Ehrm, what do you mean with `default' console?
    > >
    > > If you mean `console as defined under nr.2',
    > correct
    > > yes, you want the console that
    > > does do input.
    >
    > *I* don't always do. Remember how this thread got started? ;)

    OK, so you want /dev/console to fall back to /dev/null, right?

    > > > Taking the last one registered is basically random. If people care
    > > > enough, they should explicitly state things on the command line.
    > >
    > > No, it's not. It's explicitly mentioned in the docs: if you use multiple
    > > `console=', all of them get output, but input comes from the last one.
    >
    > Ah, true. I was barking up the "the was no 'console=' option, take
    > the default" tree. Just started looking at the console code a few
    > days ago.

    Well, you're right that if the user specifies _no_ console= option at all, the
    `first one in the linked list' will be used, which is the last one registered.
    Usually (read: if enabled) tty0 registers automatically, and it's the only one.

    Saying e.g. `console=ttyS0' causes the serial console to register itself (at
    the head of the list).
    Saying e.g. `console=tty0' afterwards causes the VT console to move back to the
    head of the list.

    So _if_ there are multiple struct consoles activated, order (read: policy) does
    matter. But usually there's only one, and all others are explicitly to be
    enabled with console=.

    Anyway, I should cook up a patch so the /dev/console demux walks the list if
    the one at the head of the list doesn't do input (read: it has no associated
    tty struct).

    Gr{oetje,eeting}s,

    Geert

    --
    Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

    In personal conversations with technical people, I call myself a hacker. But
    when I'm talking to journalists I just say "programmer" or something like that.
    -- Linus Torvalds
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