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/*
*
* @bug 4858522
* @summary Basic unit test of UnixOperatingSystemMXBean.getMaxFileDescriptorCount()
* @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. In a shell, as user who started java process, enter the command
* "limit -h descriptors"
*/
import com.sun.management.UnixOperatingSystemMXBean;
import java.lang.management.*;
public class GetMaxFileDescriptorCount {
private static UnixOperatingSystemMXBean mbean =
(UnixOperatingSystemMXBean)ManagementFactory.getOperatingSystemMXBean();
// Careful with these values.
// Min count for pass dynamically determined below.
private static long min_count_for_pass = 1;
private static final 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 min_count = mbean.getOpenFileDescriptorCount();
if (min_count > 0) {
min_count_for_pass = min_count;
}
long count = mbean.getMaxFileDescriptorCount();
if (trace) {
System.out.println("Max file descriptor count: " + count);
}
if (count < min_count_for_pass || count > MAX_COUNT_FOR_PASS) {
throw new RuntimeException("Max file descriptor count " +
"illegal value: " + count + " bytes " +
"(MIN = " + min_count_for_pass + "; " +
"MAX = " + MAX_COUNT_FOR_PASS + ")");
}
System.out.println("Test passed.");
}
}