$ ./1.term.pl 
Sleeping 1 seconds ...
Print finishing normally (sleep 1 completed)
[1]+  Done                    gedit 1.term.pl
$ ./1.term.pl 
Sleeping 1 seconds ...
Print finishing normally (sleep 1 completed)
$ ./1.term.pl 
Sleeping 3 seconds ...
^C
$ cat cleanup_handler_log.txt 
DESTROY() called. Cleaning up...
DESTROY() called. Cleaning up...