#!/usr/bin/perl
+# Copyright (C) 2011-2012 Simon Ruderich
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
use strict;
use warnings;
my $file;
open $file, '<', $temperature_path or die $!;
$temperature = <$file>;
-close $file;
+close $file or die $!;
open $file, '<', $critical_path or die $!;
$critical = <$file>;
-close $file;
+close $file or die $!;
my $value = int($temperature / 1000);
my $risk = ($critical - $temperature)/$critical;