From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?UTF-8?Q?Court=C3=A8s?=)
Subject: bug#23194: Benign error in installation image: "stty: standard input:
	Input/output error"
Date: Mon, 04 Apr 2016 16:50:40 +0200
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To: Chris Marusich <cmmarusich@gmail.com>
Cc: 23194@debbugs.gnu.org

Chris Marusich <cmmarusich@gmail.com> skribis:

> In the installation image for GuixSD v0.10.0, I get some I/O errors on
> the terminal just before/during/after the MOTD is displayed:
>
> "stty: standard input: Input/output error"

These appear to come from the =E2=80=98unicode_start=E2=80=99 command, run =
by the
=E2=80=98console-font=E2=80=99 services.  =E2=80=98unicode_start=E2=80=99 i=
s a shell script in the =E2=80=98kbd=E2=80=99
package that does:

  stty iutf8

In a =E2=80=98guix system vm gnu/system/install.scm=E2=80=99 VM in current =
master, I
sometimes get a different message:

  unicode_start skipped on not a tty

The =E2=80=9Cnot a tty=E2=80=9D string comes from the =E2=80=98tty=E2=80=99=
 command (Coreutils).  We get
it when:

  ttyname (STDIN_FILENO);

returns NULL; this can happen if =E2=80=98tcgetattr=E2=80=99 returns NULL (=
see ttyname.c
in libc.)

The =E2=80=98stty=E2=80=99 error you mention also happens when =E2=80=98tcg=
etattr=E2=80=99 fails and
returns EIO (stty.c in Coreutils):

--8<---------------cut here---------------start------------->8---
    device_name =3D _("standard input");

  if (tcgetattr (STDIN_FILENO, &mode))
    error (EXIT_FAILURE, errno, "%s", device_name);
--8<---------------cut here---------------end--------------->8---

=E2=80=98tcgetattr=E2=80=99 is actually an alias for the TCGETS ioctl.  Loo=
king at the
kernel, I don=E2=80=99t see under what circumstances we can get EIO.

That=E2=80=99s all I have for now!

Thanks for your report.
Ludo=E2=80=99.