START:
my $interrupted = 0;
eval {
  local $SIG{INT} = sub { $interrupted = 1; die };
  ...
}
if ($@) {
  if ($interrupted) {
    print "Operation was interrupted by ^C. Press <return> to retry, ^C to die\n";
    scalar <STDIN>;
    goto START;
  }
}

##</code><code>##

if ($@) {
  ...
} elsif ($interrupted) {
  print "interrupted but didn't die. Must have hit ^C during DTOR. Sorry.\n";
  die "better late than never!\n";
}