| /* |
| * Copyright (c) 1999, 2003, 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; |
| import java.util.Map; |
| import java.util.ResourceBundle; |
| |
| class SharedMemoryTransportService extends TransportService { |
| private ResourceBundle messages = null; |
| |
| /** |
| * The listener returned by startListening |
| */ |
| static class SharedMemoryListenKey extends ListenKey { |
| long id; |
| String name; |
| |
| SharedMemoryListenKey(long id, String name) { |
| this.id = id; |
| this.name = name; |
| } |
| |
| long id() { |
| return id; |
| } |
| |
| void setId(long id) { |
| this.id = id; |
| } |
| |
| public String address() { |
| return name; |
| } |
| |
| public String toString() { |
| return address(); |
| } |
| } |
| |
| SharedMemoryTransportService() { |
| System.loadLibrary("dt_shmem"); |
| initialize(); |
| } |
| |
| public String name() { |
| return "SharedMemory"; |
| } |
| |
| public String defaultAddress() { |
| return "javadebug"; |
| } |
| |
| /** |
| * Return localized description of this transport service |
| */ |
| public String description() { |
| synchronized (this) { |
| if (messages == null) { |
| messages = ResourceBundle.getBundle("com.sun.tools.jdi.resources.jdi"); |
| } |
| } |
| return messages.getString("memory_transportservice.description"); |
| } |
| |
| public Capabilities capabilities() { |
| return new SharedMemoryTransportServiceCapabilities(); |
| } |
| |
| private native void initialize(); |
| private native long startListening0(String address) throws IOException; |
| private native long attach0(String address, long attachTimeout) throws IOException; |
| private native void stopListening0(long id) throws IOException; |
| private native long accept0(long id, long acceptTimeout) throws IOException; |
| private native String name(long id) throws IOException; |
| |
| public Connection attach(String address, long attachTimeout, long handshakeTimeout) throws IOException { |
| if (address == null) { |
| throw new NullPointerException("address is null"); |
| } |
| long id = attach0(address, attachTimeout); |
| SharedMemoryConnection conn = new SharedMemoryConnection(id); |
| conn.handshake(handshakeTimeout); |
| return conn; |
| } |
| |
| public TransportService.ListenKey startListening(String address) throws IOException { |
| if (address == null || address.length() == 0) { |
| address = defaultAddress(); |
| } |
| long id = startListening0(address); |
| return new SharedMemoryListenKey(id, name(id)); |
| } |
| |
| public ListenKey startListening() throws IOException { |
| return startListening(null); |
| } |
| |
| public void stopListening(ListenKey listener) throws IOException { |
| if (!(listener instanceof SharedMemoryListenKey)) { |
| throw new IllegalArgumentException("Invalid listener"); |
| } |
| |
| long id; |
| SharedMemoryListenKey key = (SharedMemoryListenKey)listener; |
| synchronized (key) { |
| id = key.id(); |
| if (id == 0) { |
| throw new IllegalArgumentException("Invalid listener"); |
| } |
| |
| // invalidate the id |
| key.setId(0); |
| } |
| stopListening0(id); |
| } |
| |
| public Connection accept(ListenKey listener, long acceptTimeout, long handshakeTimeout) throws IOException { |
| if (!(listener instanceof SharedMemoryListenKey)) { |
| throw new IllegalArgumentException("Invalid listener"); |
| } |
| |
| long transportId; |
| SharedMemoryListenKey key = (SharedMemoryListenKey)listener; |
| synchronized (key) { |
| transportId = key.id(); |
| if (transportId == 0) { |
| throw new IllegalArgumentException("Invalid listener"); |
| } |
| } |
| |
| // in theory another thread could call stopListening before |
| // accept0 is called. In that case accept0 will try to accept |
| // with an invalid "transport id" - this should result in an |
| // IOException. |
| |
| long connectId = accept0(transportId, acceptTimeout); |
| SharedMemoryConnection conn = new SharedMemoryConnection(connectId); |
| conn.handshake(handshakeTimeout); |
| return conn; |
| } |
| } |
| |
| 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; |
| } |
| } |
| } |
| } |
| |
| |
| class SharedMemoryTransportServiceCapabilities extends TransportService.Capabilities { |
| |
| public boolean supportsMultipleConnections() { |
| return false; |
| } |
| |
| public boolean supportsAttachTimeout() { |
| return true; |
| } |
| |
| public boolean supportsAcceptTimeout() { |
| return true; |
| } |
| |
| public boolean supportsHandshakeTimeout() { |
| return false; |
| } |
| |
| } |