1 /*
   2  * Copyright (c) 2003, 2004, 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 4189011 5019303
  26  * @summary Test opening over 2048 files
  27  * @run main/timeout=300 ManyFiles
  28  */
  29 
  30 import java.io.*;
  31 import java.util.*;
  32 
  33 public class ManyFiles {
  34     static int count;
  35     static List files = new ArrayList();
  36     static List streams = new ArrayList();
  37     static int NUM_FILES = 2050;
  38 
  39     public static void main(String args[]) throws Exception {
  40         // Linux does not yet allow opening this many files; Solaris
  41         // 8 requires an explicit allocation of more file descriptors
  42         // to succeed. Since this test is written to check for a
  43         // Windows capability it is much simpler to only run it
  44         // on that platform.
  45         String osName = System.getProperty("os.name");
  46         if (osName.startsWith("Linux")||osName.startsWith("SunOS"))
  47             return;
  48 
  49         for (int n = 0; n < NUM_FILES; n++) {
  50             File f = new File("file" + count++);
  51             files.add(f);
  52             streams.add(new FileOutputStream(f));
  53         }
  54 
  55         Iterator i = streams.iterator();
  56         while(i.hasNext()) {
  57             FileOutputStream fos = (FileOutputStream)i.next();
  58             fos.close();
  59         }
  60 
  61         i = files.iterator();
  62         while(i.hasNext()) {
  63             File f = (File)i.next();
  64             f.delete();
  65         }
  66     }
  67 }