kill -INT not kiling process on linux. switched to kill -KILL

lib/guard/rails/runner.rb

@@ -21,7 +21,7 @@ module Guard
 
     def stop
       if File.file?(pid_file)
-        system %{kill -INT #{File.read(pid_file).strip}}
+        system %{kill -KILL #{File.read(pid_file).strip}}
       end
     end
     
@@ -69,7 +69,7 @@ module Guard
 
     def kill_unmanaged_pid!
       if pid = unmanaged_pid
-        system %{kill -INT #{pid}}
+        system %{kill -KILL #{pid}} 
       end
     end
 
@@ -80,6 +80,12 @@ module Guard
             return line.split("\s")[1]
           end
         }
+      elsif RbConfig::CONFIG['host_os'] =~ /linux/
+        %x{lsof -i :#{options[:port]}}.each_line { |line|
+          if line["*:#{options[:port]} "]
+            return line.split("\s")[1]
+          end
+        }
       end
       nil
     end