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/*
* Copyright 2005-2006 Sun Microsystems, Inc. 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. Sun designates this
* particular file as subject to the "Classpath" exception as provided
* by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*/
package sun.tools.attach;
import java.io.*;
import java.util.*;
import com.sun.tools.attach.*;
import com.sun.tools.attach.spi.*;
/**
* The HotSpot implementation of com.sun.tools.attach.VirtualMachine.
*/
public abstract class HotSpotVirtualMachine extends VirtualMachine
{
HotSpotVirtualMachine(AttachProvider provider, String id)
{
super(provider, id);
}
/**
* Load agent library.
* If isAbsolute is true then the agent library is the absolute path to the library and thus
* will not be expanded in the target VM.
* If isAbsolute is false then the agent library is just a library name and it will be expended
* in the target VM.
*/
private void loadAgentLibrary(String agentLibrary, boolean isAbsolute, String options)
throws AgentLoadException, AgentInitializationException, IOException
{
InputStream in = execute("load", agentLibrary, isAbsolute ? "true" : "false", options);
try {
int result = readInt(in);
if (result != 0) {
throw new AgentInitializationException("Agent_OnAttach failed", result);
}
}
finally {
in.close();
}
}
/**
* Load agent library - library name will be expanded in target VM.
*/
@Override
public void loadAgentLibrary(String agentLibrary, String options)
throws AgentLoadException, AgentInitializationException, IOException
{
loadAgentLibrary(agentLibrary, false, options);
}
/**
* Load JPLIS agent which will load the agent JAR file and invoke the agentmain method.
*/
@Override
public void loadAgent(String agent, String options)
throws AgentLoadException, AgentInitializationException, IOException
{
String args = agent;
if (options != null) {
args = args + '=' + options;
}
try {
loadAgentLibrary("instrument", args);
}
catch (AgentLoadException ignore) {
throw new InternalError("instrument library is missing in target VM");
}
catch (AgentInitializationException x) {
/*
* Translate interesting errors into the right exception and message
* (FIXME: create a better interface to the instrument implementation so this isn't
* necessary).
*/
int rc = x.returnValue();
switch (rc) {
case JNI_ENOMEM:
throw new AgentLoadException("Insufficient memory");
case ATTACH_ERROR_BADJAR:
throw new AgentLoadException("Agent JAR not found or no Agent-Class attribute");
case ATTACH_ERROR_NOTONCP:
throw new AgentLoadException("Unable to add JAR file to system class path");
case ATTACH_ERROR_STARTFAIL:
throw new AgentInitializationException(
"Agent JAR loaded but agent failed to initialize");
default:
throw new AgentLoadException("Failed to load agent - unknown reason: " + rc);
}
}
}
/*
* The possible errors returned by JPLIS's agentmain.
*/
private static final int JNI_ENOMEM = -4;
private static final int ATTACH_ERROR_BADJAR = 100;
private static final int ATTACH_ERROR_NOTONCP = 101;
private static final int ATTACH_ERROR_STARTFAIL = 102;
/**
* Send "properties" command to target VM.
*/
@Override
public Properties getSystemProperties() throws IOException
{
InputStream in = null;
Properties props = new Properties();
try {
in = executeCommand("properties");
props.load(in);
}
finally {
if (in != null) {
in.close();
}
}
return props;
}
@Override
public Properties getAgentProperties() throws IOException
{
InputStream in = null;
Properties props = new Properties();
try {
in = executeCommand("agentProperties");
props.load(in);
}
finally {
if (in != null) {
in.close();
}
}
return props;
}
// --- HotSpot specific methods ---
// same as SIGQUIT
public void localDataDump() throws IOException
{
executeCommand("datadump").close();
}
// Remote ctrl-break. The output of the ctrl-break actions can be read from the input stream.
public InputStream remoteDataDump(Object... args) throws IOException
{
return executeCommand("threaddump", args);
}
// Remote heap dump. The output (error message) can be read from the returned input stream.
public InputStream dumpHeap(Object... args) throws IOException
{
return executeCommand("dumpheap", args);
}
// Heap histogram (heap inspection in HotSpot).
public InputStream heapHisto(Object... args) throws IOException
{
return executeCommand("inspectheap", args);
}
// Set JVM command line flag.
public InputStream setFlag(String name, String value) throws IOException
{
return executeCommand("setflag", name, value);
}
// Print command line flag.
public InputStream printFlag(String name) throws IOException
{
return executeCommand("printflag", name);
}
// -- Supporting methods
/**
* Execute the given command in the target VM - specific platform implementation must implement
* this.
*/
abstract InputStream execute(String cmd, Object... args) throws AgentLoadException, IOException;
/**
* Convenience method for simple commands.
*/
private InputStream executeCommand(String cmd, Object... args) throws IOException
{
try {
return execute(cmd, args);
}
catch (AgentLoadException ignore) {
throw new InternalError("Should not get here");
}
}
/**
* Utility method to read an 'int' from the input stream.
* Ideally we should be using java.util.Scanner here but this implementation guarantees not to
* read ahead.
*/
int readInt(InputStream in) throws IOException
{
StringBuilder sb = new StringBuilder();
// read to \n or EOF
int n;
byte[] buf = new byte[1];
do {
n = in.read(buf, 0, 1);
if (n > 0) {
char c = (char) buf[0];
if (c == '\n') {
break; // EOL found
}
else {
sb.append(c);
}
}
}
while (n > 0);
if (sb.length() == 0) {
throw new IOException("Premature EOF");
}
int value;
try {
value = Integer.parseInt(sb.toString());
}
catch (NumberFormatException ignore) {
throw new IOException("Non-numeric value found - int expected");
}
return value;
}
// -- attach timeout support
private static final long defaultAttachTimeout = 5000;
private volatile long attachTimeout;
/**
* Return attach timeout based on the value of the sun.tools.attach.attachTimeout
* property, or the default timeout if the property is not set to a positive value.
*/
long attachTimeout()
{
if (attachTimeout == 0) {
synchronized (this) {
if (attachTimeout == 0) {
try {
String s = System.getProperty("sun.tools.attach.attachTimeout");
attachTimeout = Long.parseLong(s);
}
catch (SecurityException ignore) {}
catch (NumberFormatException ignore) {}
if (attachTimeout <= 0) {
attachTimeout = defaultAttachTimeout;
}
}
}
}
return attachTimeout;
}
}
