Re: KDFONTOP/PIO_UNIMAPCLR: Input/output error

[Marius Bakke <mbakke@fastmail.com>]

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ludo@gnu.org (Ludovic Courtès) writes:

> Hello Danny & all,
>
> Danny Milosavljevic <dannym@scratchpost.org> skribis:
>
>>> PIO_UNIMAPCLR: Input/output error
>>> 3) PIO_UNIMAPCLR: Input/output error
>>> 
>>> Anything to worry about?
>>
>> According to https://elixir.bootlin.com/linux/v3.2/source/include/linux/kd.h#L70
>> that's trying to clear the Unicode -> font map (that is, charmap).
>>
>> In Linux, ./drivers/tty/vt/vt_ioctl.c implements it.
>>
>> Can't see how that ever ends up in -EIO O_o
>
> Sometimes we also get:
>
>   putfont: KDFONTOP: Input/output error
>
> In both cases, the warning comes from the ‘setfont’ program, invoked
> from ‘console-font-shepherd-services’.
>
> I’ve looked at the code and man pages and like you, I don’t see where
> EIO comes from.  Maybe it’s a generic ioctl error that’s return before
> we reach the actual ioctl implementation in the VT driver, sorta like
> EBADF?
>
> Until we find out, I’d like to just silence the warnings:
>
> --- a/gnu/services/base.scm
> +++ b/gnu/services/base.scm
> @@ -754,8 +754,10 @@ to add @var{device} to the kernel's entropy pool.  The service will fail if
>                          ;; systemd's vconsole support, let's not treat
>                          ;; this as an error.
>                          (case (status:exit-val
> -                               (system* #$(file-append kbd "/bin/setfont")
> -                                        "-C" #$device #$font))
> +                               (with-error-to-port (%make-void-port "w")
> +                                 (lambda ()
> +                                   (system* #$(file-append kbd "/bin/setfont")
> +                                            "-C" #$device #$font))))
>                            ((0 71) #t)
>                            (else #f))))
>               (stop #~(const #t))
>
> Sounds good?

Less scary warnings in the first impression sounds great :-)

There should be an explaining comment with that code though.

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