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      1 /*
      2  * Copyright (C) 2016 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 import java.io.File;
     18 import java.lang.reflect.Method;
     19 import java.util.Arrays;
     20 
     21 public class Main {
     22   public static void main(String[] args) throws Exception {
     23     // Check whether we get the BootClassLoader (not null).
     24     ClassLoader bootClassLoader = Object.class.getClassLoader();
     25     if (bootClassLoader == null) {
     26       throw new IllegalStateException("Expected non-null classloader for Object");
     27     }
     28 
     29     // Try to load libarttest(d) with the BootClassLoader. First construct the filename.
     30     String libName = System.mapLibraryName(args[0]);
     31     Method libPathsMethod = Runtime.class.getDeclaredMethod("getLibPaths");
     32     libPathsMethod.setAccessible(true);
     33     String[] libPaths = (String[])libPathsMethod.invoke(Runtime.getRuntime());
     34     String fileName = null;
     35     for (String p : libPaths) {
     36       String candidate = p + libName;
     37       if (new File(candidate).exists()) {
     38           fileName = candidate;
     39           break;
     40       }
     41     }
     42     if (fileName == null) {
     43       throw new IllegalStateException("Didn't find " + libName + " in " +
     44           Arrays.toString(libPaths));
     45     }
     46 
     47     // Then call an internal function that accepts the classloader. Do not use load(), as it
     48     // is deprecated and only there for backwards compatibility, and prints a warning to the
     49     // log that we'd have to strip (it contains the pid).
     50     Method m = Runtime.class.getDeclaredMethod("nativeLoad", String.class, ClassLoader.class);
     51     m.setAccessible(true);
     52     Object result = m.invoke(Runtime.getRuntime(), fileName, bootClassLoader);
     53     if (result != null) {
     54       throw new IllegalStateException(result.toString());
     55     }
     56 
     57     System.out.println("Success.");
     58   }
     59 }
     60