1 /* 2 * Copyright (c) 2003, 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 24 /* 25 * A collection of utility methods used by the SelectorProvider.inheritedChannel 26 * unit tests. 27 */ 28 import java.net.*; 29 import java.io.*; 30 import java.nio.channels.*; 31 import java.lang.reflect.*; 32 33 public class Util { 34 35 private static Object get(String className, String fieldName, Object o) throws Exception { 36 Class cl = Class.forName(className); 37 Field fld = cl.getDeclaredField(fieldName); 38 fld.setAccessible(true); 39 return fld.get(o); 40 } 41 42 private static int fdVal(FileDescriptor fdObj) throws Exception { 43 Object fdVal = get("java.io.FileDescriptor", "fd", fdObj); 44 return ((Integer)fdVal).intValue(); 45 } 46 47 /* 48 * Return the file descriptor underlying a given SocketChannel 49 */ 50 public static int getFD(SocketChannel sc) { 51 try { 52 Object fdObj = get("sun.nio.ch.SocketChannelImpl", "fd", sc); 53 return fdVal((FileDescriptor)fdObj); 54 } catch (Exception x) { 55 x.printStackTrace(); 56 throw new InternalError(x.getMessage()); 57 } 58 } 59 60 /* 61 * Return the file descriptor underlying a given ServerSocketChannel 62 */ 63 public static int getFD(ServerSocketChannel ssc) { 64 try { 65 Object fdObj = get("sun.nio.ch.ServerSocketChannelImpl", "fd", ssc); 66 return fdVal((FileDescriptor)fdObj); 67 } catch (Exception x) { 68 x.printStackTrace(); 69 throw new InternalError(x.getMessage()); 70 } 71 } 72 73 /* 74 * Return the file descriptor underlying a given DatagramChannel 75 */ 76 public static int getFD(DatagramChannel dc) { 77 try { 78 Object fdObj = get("sun.nio.ch.DatagramChannelImpl", "fd", dc); 79 return fdVal((FileDescriptor)fdObj); 80 } catch (Exception x) { 81 x.printStackTrace(); 82 throw new InternalError(x.getMessage()); 83 } 84 } 85 86 /* 87 * Return the "java" command and any initial arguments to start the runtime 88 * in the current configuration. 89 */ 90 public static String javaCommand() { 91 return System.getProperty("java.home") + File.separator + "bin" + 92 File.separator + "java"; 93 } 94 }