1 /*
   2  * Copyright (c) 2013, 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 /* @test
  25  * @bug 8022584
  26  * @summary Some NetworkInterface methods can leak native memory
  27  * @run main/othervm/timeout=700 MemLeakTest
  28  */
  29 
  30 /* Note: the test can cause a memory leak that's why othervm option is required
  31  */
  32 
  33 import java.io.BufferedReader;
  34 import java.io.FileReader;
  35 import java.net.NetworkInterface;
  36 import java.net.SocketException;
  37 import java.util.Collection;
  38 import java.util.Collections;
  39 
  40 public class MemLeakTest {
  41 
  42     /**
  43      * Memory leak is assumed, if application consumes more than specified amount of memory during its execution.
  44      * The number is given in Kb.
  45      */
  46     private static final long MEM_LEAK_THRESHOLD = 32 * 1024; // 32Mb
  47 
  48     public static void main(String[] args)
  49             throws Exception {
  50 
  51         if (!System.getProperty("os.name").equals("Linux")) {
  52             System.out.println("Test only runs on Linux");
  53             return;
  54         }
  55 
  56         // warm up
  57         accessNetInterfaces(3);
  58 
  59         long vMemBefore = getVMemSize();
  60         accessNetInterfaces(500000);
  61         long vMemAfter = getVMemSize();
  62 
  63         long vMemDelta = vMemAfter - vMemBefore;
  64         if (vMemDelta > MEM_LEAK_THRESHOLD) {
  65             throw new Exception("FAIL: Virtual memory usage increased by " + vMemDelta + "Kb " +
  66                     "(greater than " + MEM_LEAK_THRESHOLD + "Kb)");
  67         }
  68 
  69         System.out.println("PASS: Virtual memory usage increased by " + vMemDelta + "Kb " +
  70                 "(not greater than " + MEM_LEAK_THRESHOLD + "Kb)");
  71     }
  72 
  73     private static void accessNetInterfaces(int times) {
  74         try {
  75             Collection<NetworkInterface> interfaces =
  76                     Collections.list(NetworkInterface.getNetworkInterfaces());
  77             for (int i = 0; i != times; ++i) {
  78                 for (NetworkInterface netInterface : interfaces) {
  79                     netInterface.getMTU();
  80                     netInterface.isLoopback();
  81                     netInterface.isUp();
  82                     netInterface.isPointToPoint();
  83                     netInterface.supportsMulticast();
  84                 }
  85             }
  86         } catch (SocketException ignore) {}
  87     }
  88 
  89     /**
  90      * Returns size of virtual memory allocated to the process in Kb.
  91      * Linux specific. On other platforms and in case of any errors return 0.
  92      */
  93     private static long getVMemSize() {
  94 
  95         // Refer to the Linux proc(5) man page for details about /proc/self/stat file
  96         //
  97         // In short, this file contains status information about the current process
  98         // written in one line. The fields are separated with spaces.
  99         // The 23rd field is defined as 'vsize %lu   Virtual memory size in bytes'
 100 
 101         try (FileReader fileReader = new FileReader("/proc/self/stat");
 102              BufferedReader bufferedReader = new BufferedReader(fileReader)) {
 103             String line = bufferedReader.readLine();
 104             return Long.parseLong(line.split(" ")[22]) / 1024;
 105         } catch (Exception ignore) {}
 106         return 0;
 107     }
 108 }