79 lines
2.8 KiB
Java
79 lines
2.8 KiB
Java
/*
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* Copyright 2003-2004 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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/*
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* @bug 4858522
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* @summary Basic unit test of UnixOperatingSystemMXBean.getOpenFileDescriptorCount()
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* @author Steve Bohne
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*/
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/*
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* This test is just a sanity check and does not check for the correct
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* value. The correct value should be checked manually:
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* Solaris/Linux:
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* 1. Find the pid of the java process.
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* 2. In a shell, enter the command: "ls -1 /proc/<pid>/fd | wc -l"
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*/
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import com.sun.management.UnixOperatingSystemMXBean;
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import java.lang.management.*;
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public class GetOpenFileDescriptorCount {
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private static UnixOperatingSystemMXBean mbean =
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(UnixOperatingSystemMXBean)ManagementFactory.getOperatingSystemMXBean();
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// Careful with these values.
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private static final long MIN_COUNT_FOR_PASS = 1;
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// Max count for pass dynamically determined below
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private static long max_count_for_pass = Long.MAX_VALUE;
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private static boolean trace = false;
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public static void main(String args[]) throws Exception {
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if (args.length > 0 && args[0].equals("trace")) {
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trace = true;
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}
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long max_count = mbean.getMaxFileDescriptorCount();
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if (max_count > 0) {
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max_count_for_pass = max_count;
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}
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long count = mbean.getOpenFileDescriptorCount();
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if (trace) {
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System.out.println("Open file descriptor count: " + count);
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}
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if (count < MIN_COUNT_FOR_PASS || count > max_count_for_pass) {
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throw new RuntimeException("Open file descriptor count " +
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"illegal value: " + count + " bytes " +
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"(MIN = " + MIN_COUNT_FOR_PASS + "; " +
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"MAX = " + max_count_for_pass + ")");
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}
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System.out.println("Test passed.");
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}
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}
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