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    SubjectRe: [PATCH] Console: fall back to /dev/null when no console is availlable
    On Wed, 6 Oct 2004, Willy Tarreau wrote:
    > On Wed, Oct 06, 2004 at 12:58:57AM +0300, Denis Vlasenko wrote:
    > > > + if (open("/dev/null", O_RDWR, 0) == 0)
    > > > + printk(" Falling back to /dev/null.\n");
    > > > + }
    > >
    > > What will happen if /dev is totally empty?
    >
    > ... Which is the most probable reason causing this trouble.

    Indeed, but there are other known cases.

    Some debug methods use register_console() to get their print routines
    registered. If people forget to say e.g. `console=tty0' afterwards, the debug
    console without the real device cannot be opened through /dev/console, and they
    get a mysterious error. Usually /dev/console _is_ present in the root fs.

    Perhaps a better fix is to modify the /dev/console demux code to fall back to
    `/dev/null' (quotes to indicate this has nothing to do with a present /dev/null
    on your root fs or ramdisk, but that it's the virtual null device) if the
    struct console corresponding to /dev/console is not an existing tty device.

    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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