1 /* |
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2 * Copyright (c) 2005, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 package sun.misc; |
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26 |
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27 import java.io.ByteArrayOutputStream; |
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28 import java.io.IOException; |
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29 import java.util.Properties; |
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30 import java.util.Set; |
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31 import java.util.jar.JarFile; |
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32 import java.util.jar.Manifest; |
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33 import java.util.jar.Attributes; |
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34 |
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35 /* |
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36 * Support class used by JVMTI and VM attach mechanism. |
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37 */ |
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38 public class VMSupport { |
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39 |
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40 private static Properties agentProps = null; |
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41 /** |
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42 * Returns the agent properties. |
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43 */ |
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44 public static synchronized Properties getAgentProperties() { |
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45 if (agentProps == null) { |
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46 agentProps = new Properties(); |
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47 initAgentProperties(agentProps); |
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48 } |
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49 return agentProps; |
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50 } |
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51 private static native Properties initAgentProperties(Properties props); |
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52 |
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53 /** |
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54 * Write the given properties list to a byte array and return it. Properties with |
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55 * a key or value that is not a String is filtered out. The stream written to the byte |
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56 * array is ISO 8859-1 encoded. |
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57 */ |
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58 private static byte[] serializePropertiesToByteArray(Properties p) throws IOException { |
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59 ByteArrayOutputStream out = new ByteArrayOutputStream(4096); |
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60 |
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61 Properties props = new Properties(); |
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62 |
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63 // stringPropertyNames() returns a snapshot of the property keys |
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64 Set<String> keyset = p.stringPropertyNames(); |
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65 for (String key : keyset) { |
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66 String value = p.getProperty(key); |
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67 props.put(key, value); |
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68 } |
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69 |
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70 props.store(out, null); |
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71 return out.toByteArray(); |
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72 } |
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73 |
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74 public static byte[] serializePropertiesToByteArray() throws IOException { |
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75 return serializePropertiesToByteArray(System.getProperties()); |
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76 } |
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77 |
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78 public static byte[] serializeAgentPropertiesToByteArray() throws IOException { |
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79 return serializePropertiesToByteArray(getAgentProperties()); |
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80 } |
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81 |
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82 /* |
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83 * Returns true if the given JAR file has the Class-Path attribute in the |
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84 * main section of the JAR manifest. Throws RuntimeException if the given |
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85 * path is not a JAR file or some other error occurs. |
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86 */ |
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87 public static boolean isClassPathAttributePresent(String path) { |
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88 try { |
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89 Manifest man = (new JarFile(path)).getManifest(); |
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90 if (man != null) { |
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91 if (man.getMainAttributes().getValue(Attributes.Name.CLASS_PATH) != null) { |
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92 return true; |
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93 } |
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94 } |
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95 return false; |
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96 } catch (IOException ioe) { |
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97 throw new RuntimeException(ioe.getMessage()); |
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98 } |
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99 } |
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100 |
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101 /* |
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102 * Return the temporary directory that the VM uses for the attach |
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103 * and perf data files. |
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104 * |
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105 * It is important that this directory is well-known and the |
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106 * same for all VM instances. It cannot be affected by configuration |
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107 * variables such as java.io.tmpdir. |
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108 */ |
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109 public static native String getVMTemporaryDirectory(); |
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110 } |
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