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/*
* Copyright (c) 2005, 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 sun.tools.attach;
import com.sun.tools.attach.VirtualMachine;
import com.sun.tools.attach.AgentLoadException;
import com.sun.tools.attach.AttachNotSupportedException;
import com.sun.tools.attach.spi.AttachProvider;
import sun.tools.attach.HotSpotVirtualMachine;
import java.io.IOException;
import java.io.File;
import java.io.InputStream;
import java.util.Properties;
import java.util.Random;
public class WindowsVirtualMachine extends HotSpotVirtualMachine {
// the enqueue code stub (copied into each target VM)
private static byte[] stub;
private volatile long hProcess; // handle to the process
public WindowsVirtualMachine(AttachProvider provider, String id)
throws AttachNotSupportedException, IOException
{
super(provider, id);
int pid;
try {
pid = Integer.parseInt(id);
} catch (NumberFormatException x) {
throw new AttachNotSupportedException("Invalid process identifier");
}
hProcess = openProcess(pid);
// The target VM might be a pre-6.0 VM so we enqueue a "null" command
// which minimally tests that the enqueue function exists in the target
// VM.
try {
enqueue(hProcess, stub, null, null);
} catch (IOException x) {
throw new AttachNotSupportedException(x.getMessage());
}
}
public void detach() throws IOException {
synchronized (this) {
if (hProcess != -1) {
closeProcess(hProcess);
hProcess = -1;
}
}
}
InputStream execute(String cmd, Object ... args)
throws AgentLoadException, IOException
{
assert args.length <= 3; // includes null
// create a pipe using a random name
int r = (new Random()).nextInt();
String pipename = "\\\\.\\pipe\\javatool" + r;
long hPipe = createPipe(pipename);
// check if we are detached - in theory it's possible that detach is invoked
// after this check but before we enqueue the command.
if (hProcess == -1) {
closePipe(hPipe);
throw new IOException("Detached from target VM");
}
try {
// enqueue the command to the process
enqueue(hProcess, stub, cmd, pipename, args);
// wait for command to complete - process will connect with the
// completion status
connectPipe(hPipe);
// create an input stream for the pipe
PipedInputStream is = new PipedInputStream(hPipe);
// read completion status
int status = readInt(is);
if (status != 0) {
// special case the load command so that the right exception is thrown
if (cmd.equals("load")) {
throw new AgentLoadException("Failed to load agent library");
} else {
throw new IOException("Command failed in target VM");
}
}
// return the input stream
return is;
} catch (IOException ioe) {
closePipe(hPipe);
throw ioe;
}
}
// An InputStream based on a pipe to the target VM
private class PipedInputStream extends InputStream {
private long hPipe;
public PipedInputStream(long hPipe) {
this.hPipe = hPipe;
}
public synchronized int read() throws IOException {
byte b[] = new byte[1];
int n = this.read(b, 0, 1);
if (n == 1) {
return b[0] & 0xff;
} else {
return -1;
}
}
public synchronized int read(byte[] bs, int off, int len) throws IOException {
if ((off < 0) || (off > bs.length) || (len < 0) ||
((off + len) > bs.length) || ((off + len) < 0)) {
throw new IndexOutOfBoundsException();
} else if (len == 0)
return 0;
return WindowsVirtualMachine.readPipe(hPipe, bs, off, len);
}
public void close() throws IOException {
if (hPipe != -1) {
WindowsVirtualMachine.closePipe(hPipe);
hPipe = -1;
}
}
}
//-- native methods
static native void init();
static native byte[] generateStub();
static native long openProcess(int pid) throws IOException;
static native void closeProcess(long hProcess) throws IOException;
static native long createPipe(String name) throws IOException;
static native void closePipe(long hPipe) throws IOException;
static native void connectPipe(long hPipe) throws IOException;
static native int readPipe(long hPipe, byte buf[], int off, int buflen) throws IOException;
static native void enqueue(long hProcess, byte[] stub,
String cmd, String pipename, Object ... args) throws IOException;
static {
System.loadLibrary("attach");
init(); // native initialization
stub = generateStub(); // generate stub to copy into target process
}
}
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