| /* |
| * 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); |
| } |
| } |