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/*
* Copyright (c) 2003, 2017, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* A collection of utility methods used by the SelectorProvider.inheritedChannel
* unit tests.
*/
import java.io.File;
import java.io.FileDescriptor;
import java.lang.reflect.Field;
import java.nio.channels.DatagramChannel;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
public class Util {
private static Object get(String className, String fieldName, Object o) throws Exception {
Class cl = Class.forName(className);
Field fld = cl.getDeclaredField(fieldName);
fld.setAccessible(true);
return fld.get(o);
}
private static int fdVal(FileDescriptor fdObj) throws Exception {
Object fdVal = get("java.io.FileDescriptor", "fd", fdObj);
return ((Integer)fdVal).intValue();
}
/*
* Return the file descriptor underlying a given SocketChannel
*/
public static int getFD(SocketChannel sc) {
try {
Object fdObj = get("sun.nio.ch.SocketChannelImpl", "fd", sc);
return fdVal((FileDescriptor)fdObj);
} catch (Exception x) {
x.printStackTrace();
throw new InternalError(x.getMessage());
}
}
/*
* Return the file descriptor underlying a given ServerSocketChannel
*/
public static int getFD(ServerSocketChannel ssc) {
try {
Object fdObj = get("sun.nio.ch.ServerSocketChannelImpl", "fd", ssc);
return fdVal((FileDescriptor)fdObj);
} catch (Exception x) {
x.printStackTrace();
throw new InternalError(x.getMessage());
}
}
/*
* Return the file descriptor underlying a given DatagramChannel
*/
public static int getFD(DatagramChannel dc) {
try {
Object fdObj = get("sun.nio.ch.DatagramChannelImpl", "fd", dc);
return fdVal((FileDescriptor)fdObj);
} catch (Exception x) {
x.printStackTrace();
throw new InternalError(x.getMessage());
}
}
/*
* Return the "java" command and any initial arguments to start the runtime
* in the current configuration.
*/
public static String javaCommand() {
return System.getProperty("java.home") + File.separator + "bin" +
File.separator + "java";
}
}
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