1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
|
/*
* Copyright (c) 2003, 2013, 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.
*
* 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.
*/
/* @test
* @bug 4531526
* @summary Test that more than one debuggee cannot bind to same port
* at the same time.
*
* @build VMConnection ExclusiveBind HelloWorld
* @run main ExclusiveBind
*/
import java.io.InputStream;
import java.io.IOException;
import java.io.File;
import java.net.ServerSocket;
import com.sun.jdi.Bootstrap;
import com.sun.jdi.VirtualMachine;
import com.sun.jdi.connect.Connector;
import com.sun.jdi.connect.AttachingConnector;
import java.util.Map;
import java.util.List;
import java.util.Iterator;
public class ExclusiveBind {
/*
* Helper class to direct process output to the parent
* System.out
*/
static class IOHandler implements Runnable {
InputStream in;
IOHandler(InputStream in) {
this.in = in;
}
static void handle(InputStream in) {
IOHandler handler = new IOHandler(in);
Thread thr = new Thread(handler);
thr.setDaemon(true);
thr.start();
}
public void run() {
try {
byte b[] = new byte[100];
for (;;) {
int n = in.read(b);
if (n < 0) return;
for (int i=0; i<n; i++) {
System.out.print((char)b[i]);
}
}
} catch (IOException ioe) { }
}
}
/*
* Find a connector by name
*/
private static Connector findConnector(String name) {
List connectors = Bootstrap.virtualMachineManager().allConnectors();
Iterator iter = connectors.iterator();
while (iter.hasNext()) {
Connector connector = (Connector)iter.next();
if (connector.name().equals(name)) {
return connector;
}
}
return null;
}
/*
* Launch (in server mode) a debuggee with the given address and
* suspend mode.
*/
private static Process launch(String address, boolean suspend, String class_name) throws IOException {
String exe = System.getProperty("java.home") + File.separator + "bin" +
File.separator + "java";
String cmd = exe + " " + VMConnection.getDebuggeeVMOptions() +
" -agentlib:jdwp=transport=dt_socket,server=y,suspend=";
if (suspend) {
cmd += "y";
} else {
cmd += "n";
}
cmd += ",address=" + address + " " + class_name;
System.out.println("Starting: " + cmd);
Process p = Runtime.getRuntime().exec(cmd);
IOHandler.handle(p.getInputStream());
IOHandler.handle(p.getErrorStream());
return p;
}
/*
* - pick a TCP port
* - Launch a debuggee in server=y,suspend=y,address=${port}
* - Launch a second debuggee in server=y,suspend=n with the same port
* - Second debuggee should fail with an error (address already in use)
* - For clean-up we attach to the first debuggee and resume it.
*/
public static void main(String args[]) throws Exception {
// find a free port
ServerSocket ss = new ServerSocket(0);
int port = ss.getLocalPort();
ss.close();
String address = String.valueOf(port);
// launch the first debuggee
Process process1 = launch(address, true, "HelloWorld");
// give first debuggee time to suspend
Thread.currentThread().sleep(5000);
// launch a second debuggee with the same address
Process process2 = launch(address, false, "HelloWorld");
// get exit status from second debuggee
int exitCode = process2.waitFor();
// clean-up - attach to first debuggee and resume it
AttachingConnector conn = (AttachingConnector)findConnector("com.sun.jdi.SocketAttach");
Map conn_args = conn.defaultArguments();
Connector.IntegerArgument port_arg =
(Connector.IntegerArgument)conn_args.get("port");
port_arg.setValue(port);
VirtualMachine vm = conn.attach(conn_args);
vm.resume();
// if the second debuggee ran to completion then we've got a problem
if (exitCode == 0) {
throw new RuntimeException("Test failed - second debuggee didn't fail to bind");
} else {
System.out.println("Test passed - second debuggee correctly failed to bind");
}
}
}
|
