1 /* |
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2 * Copyright (c) 2019, 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 |
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26 package sun.tools; |
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27 |
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28 import java.io.IOException; |
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29 import java.io.UncheckedIOException; |
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30 import java.nio.file.Files; |
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31 import java.nio.file.Paths; |
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32 import java.util.jar.Attributes; |
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33 import java.util.jar.JarFile; |
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34 import java.util.stream.Stream; |
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35 |
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36 /** |
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37 * A helper class that retrieves the main class name for |
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38 * a running Java process using the proc filesystem (procfs) |
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39 */ |
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40 public class ProcessHelper implements sun.tools.common.ProcessHelper { |
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41 |
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42 |
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43 private static final String CMD_PREFIX = "cmd:"; |
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44 private static final ProcessHelper INSTANCE = new ProcessHelper(); |
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45 |
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46 public static ProcessHelper getInstance() { |
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47 return INSTANCE; |
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48 } |
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49 |
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50 /** |
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51 * Gets the main class name for the given Java process by parsing the |
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52 * process command line. If the application was started with the <em>-jar</em> |
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53 * option this method returns the name of the jar file. If the application |
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54 * was started with <em>-m</em> or <em>--module</em> option, the method returns |
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55 * the module name and the main class name. |
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56 * @param pid - process ID (pid) |
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57 * @return the main class name or null if the process no longer exists or |
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58 * was started with a native launcher (e.g. jcmd etc) |
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59 */ |
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60 |
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61 public String getMainClass(String pid) { |
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62 String cmdLine = getCommandLine(pid); |
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63 if (cmdLine == null) { |
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64 return null; |
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65 } |
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66 if (cmdLine.startsWith(CMD_PREFIX)) { |
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67 cmdLine = cmdLine.substring(CMD_PREFIX.length()); |
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68 } |
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69 String[] parts = cmdLine.split("\0"); |
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70 String mainClass = null; |
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71 |
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72 if(parts.length == 0) { |
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73 return null; |
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74 } |
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75 |
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76 // Check the executable |
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77 String[] executablePath = parts[0].split("/"); |
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78 if (executablePath.length > 0) { |
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79 String binaryName = executablePath[executablePath.length - 1]; |
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80 if (!"java".equals(binaryName)) { |
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81 // Skip the process if it is not started with java launcher |
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82 return null; |
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83 } |
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84 } |
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85 |
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86 // To be consistent with the behavior on other platforms, if -jar, -m, or --module |
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87 // options are used then just return the value (the path to the jar file or module |
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88 // name with a main class). Otherwise, the main class name is the first part that |
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89 // is not a Java option (doesn't start with '-' and is not a classpath or a module |
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90 // whitespace option). |
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91 |
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92 for (int i = 1; i < parts.length && mainClass == null; i++) { |
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93 if (i < parts.length - 1) { |
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94 if (parts[i].equals("-m") || parts[i].equals("--module") || parts[i].equals("-jar")) { |
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95 return parts[i + 1]; |
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96 } |
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97 } |
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98 |
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99 if (parts[i].startsWith("--module=")) { |
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100 return parts[i].substring("--module=".length()); |
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101 } |
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102 |
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103 // If this is a classpath or a module whitespace option then skip the next part |
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104 // (the classpath or the option value itself) |
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105 if (parts[i].equals("-cp") || parts[i].equals("-classpath") || parts[i].equals("--class-path") || |
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106 isModuleWhiteSpaceOption(parts[i])) { |
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107 i++; |
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108 continue; |
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109 } |
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110 // Skip all other Java options |
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111 if (parts[i].startsWith("-")) { |
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112 continue; |
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113 } |
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114 |
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115 // If it is a source-file mode then return null |
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116 if (parts[i].endsWith(".java")) { |
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117 return null; |
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118 } |
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119 |
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120 mainClass = parts[i]; |
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121 } |
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122 return mainClass; |
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123 |
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124 } |
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125 |
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126 private static String getCommandLine(String pid) { |
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127 try (Stream<String> lines = |
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128 Files.lines(Paths.get("/proc/" + pid + "/cmdline"))) { |
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129 return lines.findFirst().orElse(null); |
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130 } catch (IOException | UncheckedIOException e) { |
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131 return null; |
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132 } |
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133 } |
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134 |
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135 private static boolean isModuleWhiteSpaceOption(String option) { |
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136 return option.equals("-p") || |
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137 option.equals("--module-path") || |
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138 option.equals("--upgrade-module-path") || |
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139 option.equals("--add-modules") || |
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140 option.equals("--limit-modules") || |
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141 option.equals("--add-exports") || |
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142 option.equals("--add-opens") || |
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143 option.equals("--add-reads") || |
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144 option.equals("--patch-module"); |
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145 } |
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146 |
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147 } |
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148 |
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149 |
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