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  1. or download this
    kill INT => $pid;
# which is the same as
kill 'INT', $pid;
  2. or download this
    $SIG{INT} = sub { 
 # code executed on 'INT' signal here
}; # <-- that semicolon isn't optional
  3. or download this
    {
  my $stop = 0;
...
}
# our old SIGINT handle is restored here, because we
# left the old block.