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bug#23194: Benign error in installation image: "stty: standard input: In
From: |
Ludovic Courtès |
Subject: |
bug#23194: Benign error in installation image: "stty: standard input: Input/output error" |
Date: |
Mon, 04 Apr 2016 16:50:40 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.5 (gnu/linux) |
Chris Marusich <address@hidden> 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 ‘unicode_start’ command, run by the
‘console-font’ services. ‘unicode_start’ is a shell script in the ‘kbd’
package that does:
stty iutf8
In a ‘guix system vm gnu/system/install.scm’ VM in current master, I
sometimes get a different message:
unicode_start skipped on not a tty
The “not a tty” string comes from the ‘tty’ command (Coreutils). We get
it when:
ttyname (STDIN_FILENO);
returns NULL; this can happen if ‘tcgetattr’ returns NULL (see ttyname.c
in libc.)
The ‘stty’ error you mention also happens when ‘tcgetattr’ fails and
returns EIO (stty.c in Coreutils):
--8<---------------cut here---------------start------------->8---
device_name = _("standard input");
if (tcgetattr (STDIN_FILENO, &mode))
error (EXIT_FAILURE, errno, "%s", device_name);
--8<---------------cut here---------------end--------------->8---
‘tcgetattr’ is actually an alias for the TCGETS ioctl. Looking at the
kernel, I don’t see under what circumstances we can get EIO.
That’s all I have for now!
Thanks for your report.
Ludo’.