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package sun.net;

import sun.security.action.GetPropertyAction;

Determines the ephemeral port range in use on this system. If this cannot be determined, then the default settings of the OS are returned.
/** * Determines the ephemeral port range in use on this system. * If this cannot be determined, then the default settings * of the OS are returned. */
public final class PortConfig { private static int defaultUpper, defaultLower; private static final int upper, lower; private PortConfig() {} static { jdk.internal.loader.BootLoader.loadLibrary("net"); String os = GetPropertyAction.privilegedGetProperty("os.name"); if (os.startsWith("Linux")) { defaultLower = 32768; defaultUpper = 61000; } else if (os.startsWith("SunOS")) { defaultLower = 32768; defaultUpper = 65535; } else if (os.contains("OS X")) { defaultLower = 49152; defaultUpper = 65535; } else if (os.startsWith("AIX")) { // The ephemeral port is OS version dependent on AIX: // http://publib.boulder.ibm.com/infocenter/aix/v7r1/topic/com.ibm.aix.rsct315.admin/bl503_ephport.htm // However, on AIX 5.3 / 6.1 / 7.1 we always see the // settings below by using: // /usr/sbin/no -a | fgrep ephemeral defaultLower = 32768; defaultUpper = 65535; } else { throw new InternalError( "sun.net.PortConfig: unknown OS"); } int v = getLower0(); if (v == -1) { v = defaultLower; } lower = v; v = getUpper0(); if (v == -1) { v = defaultUpper; } upper = v; } static native int getLower0(); static native int getUpper0(); public static int getLower() { return lower; } public static int getUpper() { return upper; } }