Hello TheloniusMonk,

Thanks for your feedback. Unfortunately adding BREAK to my list of signals still did not cause my code to trigger. The log is still empty after i close the window.

Updated Code which still does not trigger: 
# partially based upon code by BrowserUK from https://www.perlmonks.or
+g/?node_id=629210
use strict;
use Config;
use FindBin;
use File::Spec;

my $log_fn = File::Spec->catfile($FindBin::Bin, "cleanup_handler_log.t
+xt");
my $LOG;

open $LOG, '>>', $log_fn or die "Failed to open log '$log_fn' for appe
+nding ($!)\n";
binmode $LOG;
$LOG->autoflush(1); # disable buffering

my @sigs = split ' ', $Config{ sig_name };
shift @sigs;
print "SIGNALS: @sigs\n";

for ( @sigs ) {
    my $msg = "Signal $_ received\n";
    $SIG{ $_ } = sub{ print $LOG $msg; warn $msg;  };
}

my $count;
while( 1 ) {
    $count += 1 for 1.. 1e6;
    warn $count;
    sleep 3;
}

[download]
The List of signals for which a signal handler is registered: 
SIGNALS: HUP INT QUIT ILL NUM05 NUM06 NUM07 FPE KILL NUM10 SEGV NUM12 
+PIPE ALRM
TERM NUM16 NUM17 NUM18 NUM19 CHLD BREAK ABRT STOP NUM24 CONT CLD

[download]

In reply to Re^2: Window Close / Process Termination Handler on Windows by rminner
in thread Window Close / Process Termination Handler on Windows by rminner

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