I want the handler to use some variables from outside the handler.

Sounds like you want a closure

sub outer {
    my $var;

    local $SIG{INT} = sub {
       ...
       ...[ Read from and/or write to $var ]...
       ...
    };

    ...
}
[download]

Unrelated notes:

• Your usage of srand makes things less random. Remove it.

• Replace
  $SIG{...} = ...;
  with
  local $SIG{...} = ...;
  to limit the scope where your handler takes effect.

• Why is use IO::Socket; inside the sub? That's confusing!

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