| /* |
| * Copyright (c) 1999, 2012, 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. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * 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. |
| */ |
| |
| package com.sun.tools.jdi; |
| |
| import com.sun.jdi.*; |
| import com.sun.jdi.connect.*; |
| import com.sun.jdi.connect.spi.*; |
| |
| import java.io.IOException; |
| |
| class SharedMemoryConnection extends Connection { |
| private long id; |
| private Object receiveLock = new Object(); |
| private Object sendLock = new Object(); |
| private Object closeLock = new Object(); |
| private boolean closed = false; |
| |
| private native byte receiveByte0(long id) throws IOException; |
| private native void sendByte0(long id, byte b) throws IOException; |
| private native void close0(long id); |
| private native byte[] receivePacket0(long id)throws IOException; |
| private native void sendPacket0(long id, byte b[]) throws IOException; |
| |
| // handshake with the target VM |
| void handshake(long handshakeTimeout) throws IOException { |
| byte[] hello = "JDWP-Handshake".getBytes("UTF-8"); |
| |
| for (int i=0; i<hello.length; i++) { |
| sendByte0(id, hello[i]); |
| } |
| for (int i=0; i<hello.length; i++) { |
| byte b = receiveByte0(id); |
| if (b != hello[i]) { |
| throw new IOException("handshake failed - unrecognized message from target VM"); |
| } |
| } |
| } |
| |
| |
| SharedMemoryConnection(long id) throws IOException { |
| this.id = id; |
| } |
| |
| public void close() { |
| synchronized (closeLock) { |
| if (!closed) { |
| close0(id); |
| closed = true; |
| } |
| } |
| } |
| |
| public boolean isOpen() { |
| synchronized (closeLock) { |
| return !closed; |
| } |
| } |
| |
| public byte[] readPacket() throws IOException { |
| if (!isOpen()) { |
| throw new ClosedConnectionException("Connection closed"); |
| } |
| byte b[]; |
| try { |
| // only one thread may be reading at a time |
| synchronized (receiveLock) { |
| b = receivePacket0(id); |
| } |
| } catch (IOException ioe) { |
| if (!isOpen()) { |
| throw new ClosedConnectionException("Connection closed"); |
| } else { |
| throw ioe; |
| } |
| } |
| return b; |
| } |
| |
| public void writePacket(byte b[]) throws IOException { |
| if (!isOpen()) { |
| throw new ClosedConnectionException("Connection closed"); |
| } |
| |
| /* |
| * Check the packet size |
| */ |
| if (b.length < 11) { |
| throw new IllegalArgumentException("packet is insufficient size"); |
| } |
| int b0 = b[0] & 0xff; |
| int b1 = b[1] & 0xff; |
| int b2 = b[2] & 0xff; |
| int b3 = b[3] & 0xff; |
| int len = ((b0 << 24) | (b1 << 16) | (b2 << 8) | (b3 << 0)); |
| if (len < 11) { |
| throw new IllegalArgumentException("packet is insufficient size"); |
| } |
| |
| /* |
| * Check that the byte array contains the complete packet |
| */ |
| if (len > b.length) { |
| throw new IllegalArgumentException("length mis-match"); |
| } |
| |
| try { |
| // only one thread may be writing at a time |
| synchronized(sendLock) { |
| sendPacket0(id, b); |
| } |
| } catch (IOException ioe) { |
| if (!isOpen()) { |
| throw new ClosedConnectionException("Connection closed"); |
| } else { |
| throw ioe; |
| } |
| } |
| } |
| } |
| |