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/*
* Copyright (c) 2003, 2022, 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.
*/
/*
* @test
* @bug 4858522
* @summary Basic unit test of UnixOperatingSystemMXBean.getMaxFileDescriptorCount()
* @author Steve Bohne
* @requires os.family != "windows"
*
* @run main GetMaxFileDescriptorCount
*/
import com.sun.management.UnixOperatingSystemMXBean;
import java.lang.management.*;
public class GetMaxFileDescriptorCount {
private static UnixOperatingSystemMXBean mbean =
(UnixOperatingSystemMXBean) ManagementFactory.getOperatingSystemMXBean();
private static long minCountForPass = 1;
private static final long MAX_COUNT_FOR_PASS = Long.MAX_VALUE;
public static void main(String args[]) throws Exception {
long minCount = mbean.getOpenFileDescriptorCount();
if (minCount > 0) {
minCountForPass = minCount;
}
long count = mbean.getMaxFileDescriptorCount();
System.out.println("Max file descriptor count: " + count);
if (count < minCountForPass || count > MAX_COUNT_FOR_PASS) {
throw new RuntimeException("Max file descriptor count " +
"illegal value: " + count + " bytes " +
"(MIN = " + minCountForPass + "; " +
"MAX = " + MAX_COUNT_FOR_PASS + ")");
}
System.out.println("Test passed.");
}
}
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