Add SignalUtils to handle OS interrupts

Extract into a utility to be shared between Shell and RunMojo

Fixes gh-773

spring-boot-tools/spring-boot-loader-tools/src/main/java/org/springframework/boot/loader/tools/RunProcess.java

@@ -62,6 +62,12 @@ public class RunProcess {
 			if (!inheritedIO) {
 				redirectOutput(this.process);
 			}
+			SignalUtils.attachSignalHandler(new Runnable() {
+				@Override
+				public void run() {
+					handleSigInt();
+				}
+			});
 			try {
 				this.process.waitFor();
 			}

spring-boot-tools/spring-boot-loader-tools/src/main/java/org/springframework/boot/loader/tools/SignalUtils.java

@@ -0,0 +1,39 @@
+/*
+ * Copyright 2012-2013 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.loader.tools;
+
+import sun.misc.Signal;
+import sun.misc.SignalHandler;
+
+/**
+ * @author Dave Syer
+ */
+@SuppressWarnings("restriction")
+public class SignalUtils {
+
+	private static final Signal SIG_INT = new Signal("INT");
+
+	public static void attachSignalHandler(final Runnable runnable) {
+		Signal.handle(SIG_INT, new SignalHandler() {
+			@Override
+			public void handle(Signal signal) {
+				runnable.run();
+			}
+		});
+	}
+
+}