1/*
2 * Copyright (c) 2006, 2016, 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.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24/*
25 * author Edward Wang
26 *
27 * @test
28 * @bug 6368984
29 * @summary Configuring unconnected Socket before passing to implAccept
30 *          can cause fd leak
31 * @requires (os.family != "windows")
32 * @library /test/lib
33 * @build jdk.test.lib.JDKToolFinder
34 *        jdk.test.lib.process.OutputAnalyzer
35 *        AcceptCauseFileDescriptorLeak
36 * @run main/othervm AcceptCauseFileDescriptorLeak root
37 */
38
39import java.io.IOException;
40import java.net.ServerSocket;
41import java.net.Socket;
42import java.util.List;
43
44import jdk.test.lib.JDKToolFinder;
45import jdk.test.lib.process.OutputAnalyzer;
46
47public class AcceptCauseFileDescriptorLeak {
48    private static final int REPS = 2048;
49    private static final int THRESHOLD = 1024;
50
51    public static void main(String[] args) throws Exception {
52        if (args.length != 0) {
53            OutputAnalyzer analyzer = execCmd("ulimit -n -H");
54            String output = analyzer.getOutput();
55            if (output == null || output.length() == 0) {
56                throw new RuntimeException("\"ulimit -n -H\" output nothing"
57                        + " and its exit code is " + analyzer.getExitValue());
58            } else {
59                output = output.trim();
60                // Set max open file descriptors to 1024
61                // if it is unlimited or greater than 1024,
62                // otherwise just do test directly
63                if ("unlimited".equals(output)
64                        || Integer.valueOf(output) > THRESHOLD) {
65                    analyzer = execCmd("ulimit -n " + THRESHOLD + "; "
66                            + composeJavaTestStr());
67                    System.out.println("Output: ["
68                            + analyzer.getOutput() + "]");
69                    int rc = analyzer.getExitValue();
70                    if (rc != 0) {
71                        throw new RuntimeException(
72                                "Unexpected exit code: " + rc);
73                    }
74                    return;
75                }
76            }
77        }
78
79        final ServerSocket ss = new ServerSocket(0) {
80            public Socket accept() throws IOException {
81                Socket s = new Socket() {
82                };
83                s.setSoTimeout(10000);
84                implAccept(s);
85                return s;
86            }
87        };
88        Thread t = new Thread(new Runnable() {
89            public void run() {
90                try {
91                    for (int i = 0; i < REPS; i++) {
92                        (new Socket("localhost", ss.getLocalPort())).close();
93                    }
94                } catch (IOException e) {
95                    e.printStackTrace();
96                }
97            }
98        });
99        t.start();
100        try {
101            for (int i = 0; i < REPS; i++) {
102                ss.accept().close();
103            }
104        } finally {
105            ss.close();
106        }
107        t.join();
108    }
109
110    /**
111     * Execute command with shell
112     *
113     * @param  command
114     * @return OutputAnalyzer
115     * @throws IOException
116     */
117    static OutputAnalyzer execCmd(String command) throws IOException {
118        List<String> cmd = List.of("sh", "-c", command);
119        System.out.println("Executing: " + cmd);
120        ProcessBuilder pb = new ProcessBuilder(cmd);
121        return new OutputAnalyzer(pb.start());
122    }
123
124    static String composeJavaTestStr() {
125        return JDKToolFinder.getTestJDKTool("java") + " "
126                + AcceptCauseFileDescriptorLeak.class.getName();
127    }
128}
129
130