Add shutdown hook to close all ports in native code

src/main/c/Posix/SerialPort_Posix.c

@@ -180,6 +180,11 @@ JNIEXPORT void JNICALL Java_com_fazecast_jSerialComm_SerialPort_initializeLibrar
 
 JNIEXPORT void JNICALL Java_com_fazecast_jSerialComm_SerialPort_uninitializeLibrary(JNIEnv *env, jclass serialComm)
 {
+	// Close all open ports
+	for (int i = 0; i < serialPorts.length; ++i)
+		if (serialPorts.ports[i]->handle > 0)
+			Java_com_fazecast_jSerialComm_SerialPort_closePortNative(env, serialComm, (jlong)(intptr_t)serialPorts.ports[i]);
+
 	// Delete the cached global reference
 	(*env)->DeleteGlobalRef(env, serialCommClass);
 }

src/main/c/Windows/SerialPort_Windows.c

@@ -450,7 +450,12 @@ JNIEXPORT void JNICALL Java_com_fazecast_jSerialComm_SerialPort_initializeLibrar
 
 JNIEXPORT void JNICALL Java_com_fazecast_jSerialComm_SerialPort_uninitializeLibrary(JNIEnv *env, jclass serialComm)
 {
-	// Delete the cache global reference
+	// Close all open ports
+	for (int i = 0; i < serialPorts.length; ++i)
+		if (serialPorts.ports[i]->handle != INVALID_HANDLE_VALUE)
+			Java_com_fazecast_jSerialComm_SerialPort_closePortNative(env, serialComm, (jlong)(intptr_t)serialPorts.ports[i]);
+
+	// Delete the cached global reference
 	(*env)->DeleteGlobalRef(env, serialCommClass);
 }
 

src/main/java/com/fazecast/jSerialComm/SerialPort.java

@@ -343,6 +343,9 @@ public final class SerialPort
 			}
 		}
 		catch (Exception e) { e.printStackTrace(); }
+
+		// Add a shutdown hook to ensure all ports get closed
+		Runtime.getRuntime().addShutdownHook(new Thread() { public void run() { uninitializeLibrary(); } });
 	}
 
 	// Static symbolic link testing function