1 /*
2 * Copyright (c) 2005, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25 package sun.tools.attach;
26
27 import com.sun.tools.attach.VirtualMachineDescriptor;
28 import com.sun.tools.attach.VirtualMachine;
29 import com.sun.tools.attach.AttachPermission;
30 import com.sun.tools.attach.AttachNotSupportedException;
31 import com.sun.tools.attach.spi.AttachProvider;
32
33 import java.io.IOException;
34 import java.util.List;
35 import java.util.Iterator;
36 import java.util.ArrayList;
37 import java.util.Set;
38 import java.net.URISyntaxException;
39
40 import sun.jvmstat.monitor.HostIdentifier;
41 import sun.jvmstat.monitor.Monitor;
42 import sun.jvmstat.monitor.MonitoredHost;
43 import sun.jvmstat.monitor.MonitoredVm;
44 import sun.jvmstat.monitor.MonitoredVmUtil;
45 import sun.jvmstat.monitor.VmIdentifier;
46 import sun.jvmstat.monitor.MonitorException;
47
48 /*
49 * Platform specific provider implementations extend this
50 */
51 public abstract class HotSpotAttachProvider extends AttachProvider {
52
53 // perf count name for the JVM version
54 private static final String JVM_VERSION = "java.property.java.vm.version";
55
56 public HotSpotAttachProvider() {
57 }
58
59 public void checkAttachPermission() {
60 SecurityManager sm = System.getSecurityManager();
61 if (sm != null) {
62 sm.checkPermission(
63 new AttachPermission("attachVirtualMachine")
64 );
65 }
66 }
67
68 /*
69 * This listVirtualMachines implementation is based on jvmstat. Can override
70 * this in platform implementations when there is a more efficient mechanism
71 * available.
72 */
73 public List<VirtualMachineDescriptor> listVirtualMachines() {
74 ArrayList<VirtualMachineDescriptor> result =
75 new ArrayList<VirtualMachineDescriptor>();
76
77 MonitoredHost host;
78 Set vms;
79 try {
80 host = MonitoredHost.getMonitoredHost(new HostIdentifier((String)null));
81 vms = host.activeVms();
82 } catch (Throwable t) {
83 if (t instanceof ExceptionInInitializerError) {
84 t = t.getCause();
85 }
86 if (t instanceof ThreadDeath) {
87 throw (ThreadDeath)t;
88 }
89 if (t instanceof SecurityException) {
90 return result;
91 }
92 throw new InternalError(); // shouldn't happen
93 }
94
95 for (Object vmid: vms) {
96 if (vmid instanceof Integer) {
97 String pid = vmid.toString();
98 String name = pid; // default to pid if name not available
99 boolean isAttachable = false;
100 MonitoredVm mvm = null;
101 try {
102 mvm = host.getMonitoredVm(new VmIdentifier(pid));
103 try {
104 isAttachable = MonitoredVmUtil.isAttachable(mvm);
105 // use the command line as the display name
106 name = MonitoredVmUtil.commandLine(mvm);
107 } catch (Exception e) {
108 }
109 if (isAttachable) {
110 result.add(new HotSpotVirtualMachineDescriptor(this, pid, name));
111 }
112 } catch (Throwable t) {
113 if (t instanceof ThreadDeath) {
114 throw (ThreadDeath)t;
115 }
116 } finally {
117 if (mvm != null) {
118 mvm.detach();
119 }
120 }
121 }
122 }
123 return result;
124 }
125
126 /**
127 * Test if a VM is attachable. If it's not attachable,
128 * an AttachNotSupportedException will be thrown. For example,
129 * 1.4.2 or 5.0 VM are not attachable. There are cases that
130 * we can't determine if a VM is attachable or not and this method
131 * will just return.
132 *
133 * This method uses the jvmstat counter to determine if a VM
134 * is attachable. If the target VM does not have a jvmstat
135 * share memory buffer, this method returns.
136 *
137 * @exception AttachNotSupportedException if it's not attachable
138 */
139 void testAttachable(String id) throws AttachNotSupportedException {
140 MonitoredVm mvm = null;
141 try {
142 VmIdentifier vmid = new VmIdentifier(id);
143 MonitoredHost host = MonitoredHost.getMonitoredHost(vmid);
144 mvm = host.getMonitoredVm(vmid);
145
146 if (MonitoredVmUtil.isAttachable(mvm)) {
147 // it's attachable; so return false
148 return;
149 }
150 } catch (Throwable t) {
151 if (t instanceof ThreadDeath) {
152 ThreadDeath td = (ThreadDeath)t;
153 throw td;
154 }
155 // we do not know what this id is
156 return;
157 } finally {
158 if (mvm != null) {
159 mvm.detach();
160 }
161 }
162
163 // we're sure it's not attachable; throw exception
164 throw new AttachNotSupportedException(
165 "The VM does not support the attach mechanism");
166 }
167
168
169 /**
170 * A virtual machine descriptor to describe a HotSpot virtual machine.
171 */
172 static class HotSpotVirtualMachineDescriptor extends VirtualMachineDescriptor {
173 HotSpotVirtualMachineDescriptor(AttachProvider provider,
174 String id,
175 String displayName) {
176 super(provider, id, displayName);
177 }
178
179 public boolean isAttachable() {
180 return true;
181 }
182 }
183 }