| /* |
| * Copyright (c) 2006, 2014, 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.io.IOException; |
| import java.io.InputStream; |
| import java.util.Collection; |
| |
| import com.sun.tools.attach.VirtualMachine; |
| import com.sun.tools.attach.VirtualMachineDescriptor; |
| |
| import sun.tools.attach.HotSpotVirtualMachine; |
| import sun.tools.common.ProcessArgumentMatcher; |
| |
| /* |
| * This class is the main class for the JInfo utility. It parses its arguments |
| * and decides if the command should be satisfied using the VM attach mechanism |
| * or an SA tool. |
| */ |
| final public class JInfo { |
| |
| public static void main(String[] args) throws Exception { |
| if (args.length == 0) { |
| usage(1); // no arguments |
| } |
| checkForUnsupportedOptions(args); |
| |
| boolean doFlag = false; |
| boolean doFlags = false; |
| boolean doSysprops = false; |
| int flag = -1; |
| |
| // Parse the options (arguments starting with "-" ) |
| int optionCount = 0; |
| while (optionCount < args.length) { |
| String arg = args[optionCount]; |
| if (!arg.startsWith("-")) { |
| break; |
| } |
| |
| optionCount++; |
| |
| if (arg.equals("-help") || arg.equals("-h")) { |
| usage(0); |
| } |
| |
| if (arg.equals("-flag")) { |
| doFlag = true; |
| // Consume the flag |
| if (optionCount < args.length) { |
| flag = optionCount++; |
| break; |
| } |
| usage(1); |
| } |
| |
| if (arg.equals("-flags")) { |
| doFlags = true; |
| break; |
| } |
| |
| if (arg.equals("-sysprops")) { |
| doSysprops = true; |
| break; |
| } |
| } |
| |
| int paramCount = args.length - optionCount; |
| if (paramCount != 1) { |
| usage(1); |
| } |
| |
| String parg = args[optionCount]; |
| |
| ProcessArgumentMatcher ap = new ProcessArgumentMatcher(parg); |
| Collection<VirtualMachineDescriptor> vids = ap.getVirtualMachineDescriptors(JInfo.class); |
| |
| if (vids.isEmpty()) { |
| System.err.println("Could not find any processes matching : '" + parg + "'"); |
| System.exit(1); |
| } |
| |
| for (VirtualMachineDescriptor vid : vids) { |
| if (vids.size() > 1) { |
| System.out.println("Pid:" + vid.id()); |
| } |
| if (!doFlag && !doFlags && !doSysprops) { |
| // Print flags and sysporps if no options given |
| sysprops(vid.id()); |
| System.out.println(); |
| flags(vid.id()); |
| System.out.println(); |
| commandLine(vid.id()); |
| } |
| if (doFlag) { |
| if (flag < 0) { |
| System.err.println("Missing flag"); |
| usage(1); |
| } |
| flag(vid.id(), args[flag]); |
| } |
| if (doFlags) { |
| flags(vid.id()); |
| } |
| if (doSysprops) { |
| sysprops(vid.id()); |
| } |
| } |
| } |
| |
| private static void flag(String pid, String option) throws IOException { |
| HotSpotVirtualMachine vm = (HotSpotVirtualMachine) 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 = vm.setFlag(flag, value); |
| } else { |
| char c = option.charAt(0); |
| switch (c) { |
| case '+': |
| flag = option.substring(1); |
| in = vm.setFlag(flag, "1"); |
| break; |
| case '-': |
| flag = option.substring(1); |
| in = vm.setFlag(flag, "0"); |
| break; |
| default: |
| flag = option; |
| in = vm.printFlag(flag); |
| break; |
| } |
| } |
| |
| drain(vm, in); |
| } |
| |
| private static void flags(String pid) throws IOException { |
| HotSpotVirtualMachine vm = (HotSpotVirtualMachine) attach(pid); |
| InputStream in = vm.executeJCmd("VM.flags"); |
| System.out.println("VM Flags:"); |
| drain(vm, in); |
| } |
| |
| private static void commandLine(String pid) throws IOException { |
| HotSpotVirtualMachine vm = (HotSpotVirtualMachine) attach(pid); |
| InputStream in = vm.executeJCmd("VM.command_line"); |
| drain(vm, in); |
| } |
| |
| private static void sysprops(String pid) throws IOException { |
| HotSpotVirtualMachine vm = (HotSpotVirtualMachine) attach(pid); |
| InputStream in = vm.executeJCmd("VM.system_properties"); |
| System.out.println("Java System Properties:"); |
| 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(); |
| } |
| |
| private static void checkForUnsupportedOptions(String[] args) { |
| // Check arguments for -F, and non-numeric value |
| // and warn the user that SA is not supported anymore |
| int maxCount = 1; |
| int paramCount = 0; |
| |
| for (String s : args) { |
| if (s.equals("-F")) { |
| SAOptionError("-F option used"); |
| } |
| if (s.equals("-flag")) { |
| maxCount = 2; |
| } |
| if (! s.startsWith("-")) { |
| paramCount += 1; |
| } |
| } |
| |
| if (paramCount > maxCount) { |
| SAOptionError("More than " + maxCount + " non-option argument"); |
| } |
| } |
| |
| private static void SAOptionError(String msg) { |
| System.err.println("Error: " + msg); |
| System.err.println("Cannot connect to core dump or remote debug server. Use jhsdb jinfo instead"); |
| System.exit(1); |
| } |
| |
| // print usage message |
| private static void usage(int exit) { |
| System.err.println("Usage:"); |
| System.err.println(" jinfo <option> <pid>"); |
| System.err.println(" (to connect to a running process)"); |
| System.err.println(""); |
| System.err.println("where <option> is one of:"); |
| System.err.println(" -flag <name> to print the value of the named VM flag"); |
| System.err.println(" -flag [+|-]<name> to enable or disable the named VM flag"); |
| System.err.println(" -flag <name>=<value> to set the named VM flag to the given value"); |
| System.err.println(" -flags to print VM flags"); |
| System.err.println(" -sysprops to print Java system properties"); |
| System.err.println(" <no option> to print both VM flags and system properties"); |
| System.err.println(" -h | -help to print this help message"); |
| System.exit(exit); |
| } |
| } |
