From: ludo@gnu.org (Ludovic Courtès)
To: Danny Milosavljevic <dannym@scratchpost.org>
Cc: guix-devel <guix-devel@gnu.org>
Subject: Re: KDFONTOP/PIO_UNIMAPCLR: Input/output error
Date: Thu, 05 Jul 2018 00:20:49 +0200 [thread overview]
Message-ID: <87in5ubq2m.fsf@gnu.org> (raw)
In-Reply-To: <874lhfccs5.fsf_-_@gnu.org> ("Ludovic \=\?utf-8\?Q\?Court\=C3\=A8s\?\= \=\?utf-8\?Q\?\=22's\?\= message of "Wed, 04 Jul 2018 16:10:18 +0200")
ludo@gnu.org (Ludovic Courtès) skribis:
> 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?
I think I have a plausible explanation. :-) The EIO comes from
‘hung_up_tty_ioctl’ in drivers/tty/tty_io.c. This is because mingetty
would call ‘vhangup’, and presumably, there was a time window where
‘setfont’ would find itself talking to a hung-up terminal. QED.
Anyway, in commit a043b5b81a080c47e24298c80857919b9ea21bb2 I’ve added
--nohangup to mingetty and now ‘setfont’ is happy, and so am I.
Ludo’.
next prev parent reply other threads:[~2018-07-04 22:20 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-03 8:15 Installation-Protocol for GuixSD x86_64 v0.15-preview Björn Höfling
2018-07-03 10:49 ` Tobias Geerinckx-Rice
2018-07-03 11:38 ` (Ab?)using aliases to set ls' and others' colours Tobias Geerinckx-Rice
2018-07-04 18:01 ` Björn Höfling
2018-07-04 22:17 ` Ludovic Courtès
2018-07-04 22:17 ` Ricardo Wurmus
2018-07-04 17:56 ` Installation-Protocol for GuixSD x86_64 v0.15-preview Björn Höfling
2018-07-03 13:20 ` Marius Bakke
2018-07-03 13:27 ` Danny Milosavljevic
2018-07-03 21:35 ` Ludovic Courtès
2018-07-04 14:10 ` KDFONTOP/PIO_UNIMAPCLR: Input/output error Ludovic Courtès
2018-07-04 14:29 ` Marius Bakke
2018-07-04 22:20 ` Ludovic Courtès [this message]
2018-07-03 21:42 ` Installation-Protocol for GuixSD x86_64 v0.15-preview Ludovic Courtès
2018-07-04 18:06 ` Björn Höfling
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