J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2003-2004 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 21 | * have any questions. |
| 22 | */ |
| 23 | |
| 24 | /* |
| 25 | * @bug 4858522 |
| 26 | * @summary Basic unit test of UnixOperatingSystemMXBean.getOpenFileDescriptorCount() |
| 27 | * @author Steve Bohne |
| 28 | */ |
| 29 | |
| 30 | /* |
| 31 | * This test is just a sanity check and does not check for the correct |
| 32 | * value. The correct value should be checked manually: |
| 33 | * Solaris/Linux: |
| 34 | * 1. Find the pid of the java process. |
| 35 | * 2. In a shell, enter the command: "ls -1 /proc/<pid>/fd | wc -l" |
| 36 | */ |
| 37 | |
| 38 | import com.sun.management.UnixOperatingSystemMXBean; |
| 39 | import java.lang.management.*; |
| 40 | |
| 41 | public class GetOpenFileDescriptorCount { |
| 42 | |
| 43 | private static UnixOperatingSystemMXBean mbean = |
| 44 | (UnixOperatingSystemMXBean)ManagementFactory.getOperatingSystemMXBean(); |
| 45 | |
| 46 | // Careful with these values. |
| 47 | private static final long MIN_COUNT_FOR_PASS = 1; |
| 48 | // Max count for pass dynamically determined below |
| 49 | private static long max_count_for_pass = Long.MAX_VALUE; |
| 50 | |
| 51 | private static boolean trace = false; |
| 52 | |
| 53 | public static void main(String args[]) throws Exception { |
| 54 | if (args.length > 0 && args[0].equals("trace")) { |
| 55 | trace = true; |
| 56 | } |
| 57 | |
| 58 | long max_count = mbean.getMaxFileDescriptorCount(); |
| 59 | if (max_count > 0) { |
| 60 | max_count_for_pass = max_count; |
| 61 | } |
| 62 | |
| 63 | long count = mbean.getOpenFileDescriptorCount(); |
| 64 | |
| 65 | if (trace) { |
| 66 | System.out.println("Open file descriptor count: " + count); |
| 67 | } |
| 68 | |
| 69 | if (count < MIN_COUNT_FOR_PASS || count > max_count_for_pass) { |
| 70 | throw new RuntimeException("Open file descriptor count " + |
| 71 | "illegal value: " + count + " bytes " + |
| 72 | "(MIN = " + MIN_COUNT_FOR_PASS + "; " + |
| 73 | "MAX = " + max_count_for_pass + ")"); |
| 74 | } |
| 75 | |
| 76 | System.out.println("Test passed."); |
| 77 | } |
| 78 | } |