/* * Copyright (c) 2006, 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.jinfo;import java.lang.reflect.Method;import java.io.File;import java.io.IOException;import java.io.InputStream;import com.sun.tools.attach.VirtualMachine;import sun.tools.attach.HotSpotVirtualMachine;/* * This class is the main class for the JInfo utility. It parses its arguments * and decides if the command should be satisifed using the VM attach mechanism * or an SA tool. At this time the only option that uses the VM attach * mechanism is the -flag option to set or print a command line option of a * running application. All other options are mapped to SA tools. */public class JInfo { public static void main(String[] args) throws Exception { if (args.length == 0) { usage(); // no arguments } boolean useSA = true; String arg1 = args[0]; if (arg1.startsWith("-")) { if (arg1.equals("-flags") || arg1.equals("-sysprops")) { // SA JInfo needs <pid> or <server> or // (<executable> and <code file>). So, total // argument count including option has to 2 or 3. if (args.length != 2 && args.length != 3) { usage(); } } else if (arg1.equals("-flag")) { // do not use SA, use attach-on-demand useSA = false; } else { // unknown option or -h or -help, print help usage(); } } if (useSA) { runTool(args); } else { if (args.length == 3) { String pid = args[2]; String option = args[1]; flag(pid, option); } else { usage(); } } } // Invoke SA tool with the given arguments private static void runTool(String args[]) throws Exception { String tool = "sun.jvm.hotspot.tools.JInfo"; // Tool not available on this platform. Class<?> c = loadClass(tool); if (c == null) { usage(); } // invoke the main method with the arguments Class[] argTypes = { String[].class } ; Method m = c.getDeclaredMethod("main", argTypes); Object[] invokeArgs = { args }; m.invoke(null, invokeArgs); } // loads the given class using the system class loader private static Class loadClass(String name) { // // We specify the system clas loader so as to cater for development // environments where this class is on the boot class path but sa-jdi.jar // is on the system class path. Once the JDK is deployed then both // tools.jar and sa-jdi.jar are on the system class path. // try { return Class.forName(name, true, ClassLoader.getSystemClassLoader()); } catch (Exception x) { } return null; } private static void flag(String pid, String option) throws IOException { VirtualMachine vm = attach(pid); String flag; InputStream in; int index = option.indexOf('='); if (index != -1) { flag = option.substring(0, index); String value = option.substring(index + 1); in = ((HotSpotVirtualMachine)vm).setFlag(flag, value); } else { char c = option.charAt(0); switch (c) { case '+': flag = option.substring(1); in = ((HotSpotVirtualMachine)vm).setFlag(flag, "1"); break; case '-': flag = option.substring(1); in = ((HotSpotVirtualMachine)vm).setFlag(flag, "0"); break; default: flag = option; in = ((HotSpotVirtualMachine)vm).printFlag(flag); break; } } drain(vm, in); } // Attach to <pid>, exiting if we fail to attach private static VirtualMachine attach(String pid) { try { return VirtualMachine.attach(pid); } catch (Exception x) { String msg = x.getMessage(); if (msg != null) { System.err.println(pid + ": " + msg); } else { x.printStackTrace(); } System.exit(1); return null; // keep compiler happy } } // Read the stream from the target VM until EOF, then detach private static void drain(VirtualMachine vm, InputStream in) throws IOException { // read to EOF and just print output byte b[] = new byte[256]; int n; do { n = in.read(b); if (n > 0) { String s = new String(b, 0, n, "UTF-8"); System.out.print(s); } } while (n > 0); in.close(); vm.detach(); } // print usage message private static void usage() { Class c = loadClass("sun.jvm.hotspot.tools.JInfo"); boolean usageSA = (c != null); System.out.println("Usage:"); if (usageSA) { System.out.println(" jinfo [option] <pid>"); System.out.println(" (to connect to running process)"); System.out.println(" jinfo [option] <executable <core>"); System.out.println(" (to connect to a core file)"); System.out.println(" jinfo [option] [server_id@]<remote server IP or hostname>"); System.out.println(" (to connect to remote debug server)"); System.out.println(""); System.out.println("where <option> is one of:"); System.out.println(" -flag <name> to print the value of the named VM flag"); System.out.println(" -flag [+|-]<name> to enable or disable the named VM flag"); System.out.println(" -flag <name>=<value> to set the named VM flag to the given value"); System.out.println(" -flags to print VM flags"); System.out.println(" -sysprops to print Java system properties"); System.out.println(" <no option> to print both of the above"); System.out.println(" -h | -help to print this help message"); } else { System.out.println(" jinfo <option> <pid>"); System.out.println(" (to connect to a running process)"); System.out.println(""); System.out.println("where <option> is one of:"); System.out.println(" -flag <name> to print the value of the named VM flag"); System.out.println(" -flag [+|-]<name> to enable or disable the named VM flag"); System.out.println(" -flag <name>=<value> to set the named VM flag to the given value"); System.out.println(" -h | -help to print this help message"); } System.exit(1); }}
/*
* Copyright (c) 2006, 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.jinfo;
import java.lang.reflect.Method;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import com.sun.tools.attach.VirtualMachine;
import sun.tools.attach.HotSpotVirtualMachine;
/*
* This class is the main class for the JInfo utility. It parses its arguments
* and decides if the command should be satisifed using the VM attach mechanism
* or an SA tool. At this time the only option that uses the VM attach
* mechanism is the -flag option to set or print a command line option of a
* running application. All other options are mapped to SA tools.
*/
public class JInfo {
public static void main(String[] args) throws Exception {
if (args.length == 0) {
usage(); // no arguments
}
boolean useSA = true;
String arg1 = args[0];
if (arg1.startsWith("-")) {
if (arg1.equals("-flags") ||
arg1.equals("-sysprops")) {
// SA JInfo needs <pid> or <server> or
// (<executable> and <code file>). So, total
// argument count including option has to 2 or 3.
if (args.length != 2 && args.length != 3) {
usage();
}
} else if (arg1.equals("-flag")) {
// do not use SA, use attach-on-demand
useSA = false;
} else {
// unknown option or -h or -help, print help
usage();
}
}
if (useSA) {
runTool(args);
} else {
if (args.length == 3) {
String pid = args[2];
String option = args[1];
flag(pid, option);
} else {
usage();
}
}
}
// Invoke SA tool with the given arguments
private static void runTool(String args[]) throws Exception {
String tool = "sun.jvm.hotspot.tools.JInfo";
// Tool not available on this platform.
Class<?> c = loadClass(tool);
if (c == null) {
usage();
}
// invoke the main method with the arguments
Class[] argTypes = { String[].class } ;
Method m = c.getDeclaredMethod("main", argTypes);
Object[] invokeArgs = { args };
m.invoke(null, invokeArgs);
}
// loads the given class using the system class loader
private static Class loadClass(String name) {
//
// We specify the system clas loader so as to cater for development
// environments where this class is on the boot class path but sa-jdi.jar
// is on the system class path. Once the JDK is deployed then both
// tools.jar and sa-jdi.jar are on the system class path.
//
try {
return Class.forName(name, true,
ClassLoader.getSystemClassLoader());
} catch (Exception x) { }
return null;
}
private static void flag(String pid, String option) throws IOException {
VirtualMachine vm = attach(pid);
String flag;
InputStream in;
int index = option.indexOf('=');
if (index != -1) {
flag = option.substring(0, index);
String value = option.substring(index + 1);
in = ((HotSpotVirtualMachine)vm).setFlag(flag, value);
} else {
char c = option.charAt(0);
switch (c) {
case '+':
flag = option.substring(1);
in = ((HotSpotVirtualMachine)vm).setFlag(flag, "1");
break;
case '-':
flag = option.substring(1);
in = ((HotSpotVirtualMachine)vm).setFlag(flag, "0");
break;
default:
flag = option;
in = ((HotSpotVirtualMachine)vm).printFlag(flag);
break;
}
}
drain(vm, in);
}
// Attach to <pid>, exiting if we fail to attach
private static VirtualMachine attach(String pid) {
try {
return VirtualMachine.attach(pid);
} catch (Exception x) {
String msg = x.getMessage();
if (msg != null) {
System.err.println(pid + ": " + msg);
} else {
x.printStackTrace();
}
System.exit(1);
return null; // keep compiler happy
}
}
// Read the stream from the target VM until EOF, then detach
private static void drain(VirtualMachine vm, InputStream in) throws IOException {
// read to EOF and just print output
byte b[] = new byte[256];
int n;
do {
n = in.read(b);
if (n > 0) {
String s = new String(b, 0, n, "UTF-8");
System.out.print(s);
}
} while (n > 0);
in.close();
vm.detach();
}
// print usage message
private static void usage() {
Class c = loadClass("sun.jvm.hotspot.tools.JInfo");
boolean usageSA = (c != null);
System.out.println("Usage:");
if (usageSA) {
System.out.println(" jinfo [option] <pid>");
System.out.println(" (to connect to running process)");
System.out.println(" jinfo [option] <executable <core>");
System.out.println(" (to connect to a core file)");
System.out.println(" jinfo [option] [server_id@]<remote server IP or hostname>");
System.out.println(" (to connect to remote debug server)");
System.out.println("");
System.out.println("where <option> is one of:");
System.out.println(" -flag <name> to print the value of the named VM flag");
System.out.println(" -flag [+|-]<name> to enable or disable the named VM flag");
System.out.println(" -flag <name>=<value> to set the named VM flag to the given value");
System.out.println(" -flags to print VM flags");
System.out.println(" -sysprops to print Java system properties");
System.out.println(" <no option> to print both of the above");
System.out.println(" -h | -help to print this help message");
} else {
System.out.println(" jinfo <option> <pid>");
System.out.println(" (to connect to a running process)");
System.out.println("");
System.out.println("where <option> is one of:");
System.out.println(" -flag <name> to print the value of the named VM flag");
System.out.println(" -flag [+|-]<name> to enable or disable the named VM flag");
System.out.println(" -flag <name>=<value> to set the named VM flag to the given value");
System.out.println(" -h | -help to print this help message");
}
System.exit(1);
}
}