01-12-2011
Ah, now things are becoming clearer! You are using Plymouth for graphical boot animation and shutdown.
As far as I recall, to do what you want will require some actual C coding. You need to register a callback using ply_window_add_keyboard_input_handler() to get called whenever a user types something. Also note that Plymouth deliberating stops watching for keyboard input at certain times.
It is a while since I looked under the hood at the Plymouth source code but I do not think things have change much since then as I do not see much traffic on the Plymouth mailing list.
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LEARN ABOUT XFREE86
plymouthd
PLYMOUTHD(8) System Administration PLYMOUTHD(8)
NAME
plymouthd - The plymouth daemon
SYNOPSIS
plymouthd [OPTION...]
DESCRIPTION
The plymouthd daemon is usually run out of the initrd. It does the heavy lifting of the plymouth system, logging the session and showing
the splash screen.
The plymouth is used to send commands to plymouthd that control its behaviour.
OPTIONS
The following options are understood:
--help
Show summary of options.
--attach-to-session
Redirect console messages from screen to log.
--no-daemon
Do not daemonize.
--debug
Output debugging information.
--debug-file=STRING
File to write debugging information to.
--mode=MODE
Set mode to either boot or shutdown.
--pid-file=STRING
Write the PID of the daemon to a file.
--kernel-command-line=STRING
Fake kernel commandline to use.
--tty=STRING
TTY to ues instead of default.
SEE ALSO
grub(8), plymouth(8), plymouth(1), http://www.freedesktop.org/wiki/Software/Plymouth
plymouth PLYMOUTHD(8)