--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/java.base/share/classes/jdk/internal/vm/VMSupport.java	Sun Apr 03 16:28:41 2016 +0100
@@ -0,0 +1,110 @@
+/*
+ * Copyright (c) 2005, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code 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
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package jdk.internal.vm;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.util.Properties;
+import java.util.Set;
+import java.util.jar.JarFile;
+import java.util.jar.Manifest;
+import java.util.jar.Attributes;
+
+/*
+ * Support class used by JVMTI and VM attach mechanism.
+ */
+public class VMSupport {
+
+    private static Properties agentProps = null;
+    /**
+     * Returns the agent properties.
+     */
+    public static synchronized Properties getAgentProperties() {
+        if (agentProps == null) {
+            agentProps = new Properties();
+            initAgentProperties(agentProps);
+        }
+        return agentProps;
+    }
+    private static native Properties initAgentProperties(Properties props);
+
+    /**
+     * Write the given properties list to a byte array and return it. Properties with
+     * a key or value that is not a String is filtered out. The stream written to the byte
+     * array is ISO 8859-1 encoded.
+     */
+    private static byte[] serializePropertiesToByteArray(Properties p) throws IOException {
+        ByteArrayOutputStream out = new ByteArrayOutputStream(4096);
+
+        Properties props = new Properties();
+
+        // stringPropertyNames() returns a snapshot of the property keys
+        Set<String> keyset = p.stringPropertyNames();
+        for (String key : keyset) {
+            String value = p.getProperty(key);
+            props.put(key, value);
+        }
+
+        props.store(out, null);
+        return out.toByteArray();
+    }
+
+    public static byte[] serializePropertiesToByteArray() throws IOException {
+        return serializePropertiesToByteArray(System.getProperties());
+    }
+
+    public static byte[] serializeAgentPropertiesToByteArray() throws IOException {
+        return serializePropertiesToByteArray(getAgentProperties());
+    }
+
+    /*
+     * Returns true if the given JAR file has the Class-Path attribute in the
+     * main section of the JAR manifest. Throws RuntimeException if the given
+     * path is not a JAR file or some other error occurs.
+     */
+    public static boolean isClassPathAttributePresent(String path) {
+        try {
+            Manifest man = (new JarFile(path)).getManifest();
+            if (man != null) {
+                if (man.getMainAttributes().getValue(Attributes.Name.CLASS_PATH) != null) {
+                    return true;
+                }
+            }
+            return false;
+        } catch (IOException ioe) {
+            throw new RuntimeException(ioe.getMessage());
+        }
+    }
+
+    /*
+     * Return the temporary directory that the VM uses for the attach
+     * and perf data files.
+     *
+     * It is important that this directory is well-known and the
+     * same for all VM instances. It cannot be affected by configuration
+     * variables such as java.io.tmpdir.
+     */
+    public static native String getVMTemporaryDirectory();
+}