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    SubjectRe: [PATCH] Console: fall back to /dev/null when no console is availlable
    On Tue, Oct 05, 2004 at 02:06:59PM -0700, Greg KH wrote:
    > On Tue, Oct 05, 2004 at 09:27:12PM +0100, Russell King wrote:
    > > On Tue, Oct 05, 2004 at 08:52:14PM +0200, J?rn Engel wrote:
    > > > Looks pretty trivial, but opinions on this subject may vary.
    > > > Comments?
    > >
    > > There's a related problem. /sbin/hotplug. I keep seeing odd failures
    > > from /sbin/hotplug scripts which go away when I ensure that fd0,1,2 are
    > > directed at something real.
    >
    > Which scripts cause this problem?

    I have no idea. Somewhere in the depths of the Red Hat networking
    scripts. There's multiple of them calling multiple other programs
    and it's impossible to debug what's going on. All I know is that
    IPv6 doesn't get configured if fd0,1,2 are closed, but does if they're
    open.

    It could be a script, or some other program. There's no way to tell.

    > > It's rather annoying because it currently means that, when my PCMCIA net
    > > interface on the firewall comes up, the IPv4 configuration works fine
    > > but IPv6 configuration falls dead on its nose without any explaination
    > > why.
    > >
    > > And, like I say, redirecting fd0,1,2 fixes it.
    >
    > Redirecting it in the script itself? Or in the kernel like this patch?

    I'm redirecting them in the /sbin/hotplug script to something sane,
    but I think the kernel itself should be directing these three fd's
    to somewhere whenever it invokes any user program, even if it is
    /dev/null.

    I think Alan disagrees with me, but I think the history that these
    types of problems _keep_ cropping up over and over is proof enough
    that it's necessary for sane userspace.

    (Another example which is happening _now_: having /sbin/init die over
    a suspend/resume cycle because you have no system console on your
    embedded device isn't nice.)

    --
    Russell King
    Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/
    maintainer of: 2.6 PCMCIA - http://pcmcia.arm.linux.org.uk/
    2.6 Serial core
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