Quelle PortConfig.java Sprache: JAVA

/*
* Copyright (c) 2013, 2020, 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.  Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* 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.
*/

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.
*/

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.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;
    }
}

quality94%

¤ Dauer der Verarbeitung: 0.0 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.