| /* |
| * Copyright (c) 2003, 2004, 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. |
| */ |
| |
| /* |
| * @bug 4858522 |
| * @summary Basic unit test of UnixOperatingSystemMXBean.getOpenFileDescriptorCount() |
| * @author Steve Bohne |
| */ |
| |
| /* |
| * This test is just a sanity check and does not check for the correct |
| * value. The correct value should be checked manually: |
| * Solaris/Linux: |
| * 1. Find the pid of the java process. |
| * 2. In a shell, enter the command: "ls -1 /proc/<pid>/fd | wc -l" |
| */ |
| |
| import com.sun.management.UnixOperatingSystemMXBean; |
| import java.lang.management.*; |
| |
| public class GetOpenFileDescriptorCount { |
| |
| private static UnixOperatingSystemMXBean mbean = |
| (UnixOperatingSystemMXBean)ManagementFactory.getOperatingSystemMXBean(); |
| |
| // Careful with these values. |
| private static final long MIN_COUNT_FOR_PASS = 1; |
| // Max count for pass dynamically determined below |
| private static long max_count_for_pass = Long.MAX_VALUE; |
| |
| private static boolean trace = false; |
| |
| public static void main(String args[]) throws Exception { |
| if (args.length > 0 && args[0].equals("trace")) { |
| trace = true; |
| } |
| |
| long max_count = mbean.getMaxFileDescriptorCount(); |
| if (max_count > 0) { |
| max_count_for_pass = max_count; |
| } |
| |
| long count = mbean.getOpenFileDescriptorCount(); |
| |
| if (trace) { |
| System.out.println("Open file descriptor count: " + count); |
| } |
| |
| if (count < MIN_COUNT_FOR_PASS || count > max_count_for_pass) { |
| throw new RuntimeException("Open file descriptor count " + |
| "illegal value: " + count + " bytes " + |
| "(MIN = " + MIN_COUNT_FOR_PASS + "; " + |
| "MAX = " + max_count_for_pass + ")"); |
| } |
| |
| System.out.println("Test passed."); |
| } |
| } |