1 /* 2 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 package jdk.internal.nicl; 24 25 import java.io.File; 26 import java.lang.reflect.Field; 27 import java.nicl.Library; 28 import java.nicl.NativeScope; 29 import java.nicl.Scope; 30 import java.nicl.types.Pointer; 31 import java.security.AccessController; 32 import java.security.PrivilegedAction; 33 import static sun.security.action.GetPropertyAction.privilegedGetProperty; 34 import static jdk.internal.nicl.UnixDynamicLibraries.*; 35 36 public class LdLoader extends LibraryLoader { 37 private static final boolean DEBUG = Boolean.parseBoolean( 38 privilegedGetProperty("jdk.internal.nicl.LdLoader.DEBUG")); 39 40 private final String[] usr_paths; 41 42 // preloaded/built-in library 43 private final UnixLibrary defaultLibrary; 44 45 private String[] getUserClassPath() { 46 return AccessController.doPrivileged((PrivilegedAction<String[]>)() -> { 47 try { 48 Field f = ClassLoader.class.getDeclaredField("usr_paths"); 49 f.setAccessible(true); 50 return (String[])f.get(null); 51 } catch (NoSuchFieldException | SecurityException | IllegalArgumentException | IllegalAccessException e) { 52 throw new RuntimeException(e); 53 } 54 }); 55 } 56 57 public LdLoader() { 58 this.usr_paths = getUserClassPath(); 59 this.defaultLibrary = new UnixLibrary(null); 60 } 61 62 @Override 63 public Library getDefaultLibrary() { 64 return defaultLibrary; 65 } 66 67 private Library tryLoadLibrary(String libPath) { 68 if (DEBUG) { 69 System.err.println("Trying " + libPath); 70 } 71 72 try (Scope scope = new NativeScope()) { 73 Pointer<Byte> cname = scope.toCString(libPath); 74 75 try { 76 Pointer<Void> handle = UnixDynamicLibraries.getInstance().dlopen(cname, RTLD_LAZY); 77 if (handle != null) { 78 return new UnixLibrary(handle); 79 } 80 81 if (DEBUG) { 82 Pointer<Byte> err = UnixDynamicLibraries.getInstance().dlerror(); 83 if (err != null) { 84 System.err.println(Pointer.toString(err)); 85 } 86 } 87 88 throw new UnsatisfiedLinkError("Can't load library: " + libPath); 89 } catch (Throwable t) { 90 throw new RuntimeException(t); 91 } 92 } 93 } 94 95 @Override 96 public Library load(String name, boolean isAbsolute) { 97 if (DEBUG) { 98 System.err.println("Library.load(U, " + name + ", " + isAbsolute + ")"); 99 } 100 101 if (isAbsolute) { 102 return tryLoadLibrary(name); 103 } 104 105 for (String usr_path : usr_paths) { 106 String libPath = usr_path + File.separator + name; 107 try { 108 return tryLoadLibrary(libPath); 109 } catch (UnsatisfiedLinkError e) { 110 // ignore and try next path 111 } 112 } 113 114 throw new UnsatisfiedLinkError(name); 115 } 116 } --- EOF ---