1/*
2 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26package sun.net;
27
28import java.security.AccessController;
29
30/**
31 * Determines the ephemeral port range in use on this system.
32 * If this cannot be determined, then the default settings
33 * of the OS are returned.
34 */
35
36public final class PortConfig {
37
38    private static int defaultUpper, defaultLower;
39    private static final int upper, lower;
40
41    static {
42        AccessController.doPrivileged(
43            new java.security.PrivilegedAction<Void>() {
44                public Void run() {
45                    System.loadLibrary("net");
46                    return null;
47                }
48            });
49
50        int v = getLower0();
51        if (v == -1) {
52            v = defaultLower;
53        }
54        lower = v;
55
56        v = getUpper0();
57        if (v == -1) {
58            v = defaultUpper;
59        }
60        upper = v;
61    }
62
63    static native int getLower0();
64    static native int getUpper0();
65
66    public static int getLower() {
67        return lower;
68    }
69
70    public static int getUpper() {
71        return upper;
72    }
73}
74