Echoless terminal state after exiting Tk/Term::ReadLine event loop (Solved!)

[gnosti]

Hello Esteemed Monks,

I have an app using Tk's main window integrated with Term::ReadLine::Gnu in the terminal window. I would like to be able to clean up before exiting on Ctrl-C issued in either window.

With main window focus, I use Tk::bind to associate Ctrl-C with a callback (\&abort) that exits via CORE::exit. Although this causes a hard landing (segfault), the terminal functions normally afterwards.

With terminal window focus, the signal handler exits in the same way, however, after exiting, the terminal fails to echo the characters I type. Leaving via Tk::exit() results in the same echoless state, regardless of how it is invoked.

I suspect the line $OUT = $term->OUT || \*STDOUT (which I cut and pasted) of doing some redirection.

Update:This line provides an output filehandle, however all of my print statements output correctly without writing print $OUT $something.

I also looked at the Term::ReadLine methods such as rl_reset_terminal() without finding a solution.

Update: Issuing $term->rl_deprep_terminal() before exit() appears to solve the problem. (c.f 'man readline')

Here is my (revised) code:

use Tk;
my $mw = MainWindow->new;
$mw->bind('<Control-Key-c>' => \&abort);
use Term::ReadLine;
$SIG{INT} = \&abort;
my $term = new Term::ReadLine();
loop();
sub loop {
    $term->tkRunning(1);
    $OUT = $term->OUT || \*STDOUT;
    while (1) {
        my ($user_input) = $term->readline("input>") ;
        process_line( $user_input );
    }
}

sub abort {
    # do some cleanup
    $term->rl_deprep_terminal(); # Update!
    CORE::exit();
}
sub process_line { print "user input: $_[0]\n" }

Update: Including $term->rl_deprep_terminal() in &abort appears sufficient to terminate the application.