/*
* Copyright (c) 2012, 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.
*
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*/
/*
* @test
* @bug 6853676
* @summary On computers with more than 4 GB of memory,
* the GlobalMemoryStatus function can return incorrect information,
* reporting a value of -1 to indicate an overflow.
*
* @run main MemoryStatusOverflow
*/
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.ArrayList;
import java.util.List;
import java.lang.management.ManagementFactory;
import com.sun.management.OperatingSystemMXBean;
public class MemoryStatusOverflow {
static final long MEMORYSTATUS_OVERFLOW = (1L << 32) - 1; // (DWORD) -1
public static void main(String... args) throws Exception {
OperatingSystemMXBean bean = (OperatingSystemMXBean)
ManagementFactory.getOperatingSystemMXBean();
List<String> failedGetterNames = new ArrayList<String>();
List<String> testedGetterNames = Arrays.asList(
"getTotalSwapSpaceSize", "getFreeSwapSpaceSize",
"getTotalPhysicalMemorySize", "getFreePhysicalMemorySize");
for (String getterName : testedGetterNames) {
Method getter = OperatingSystemMXBean.class.getMethod(getterName);
long value = (Long) getter.invoke(bean);
if (value == MEMORYSTATUS_OVERFLOW) {
failedGetterNames.add(getterName);
}
}
if (!failedGetterNames.isEmpty()) {
throw new AssertionError(failedGetterNames);
}
System.out.println("Test passed.");
}
}