1/*
2 * Copyright (c) 2010, 2012, 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.sdp;
27
28import java.io.IOException;
29import java.io.FileDescriptor;
30import java.security.AccessController;
31
32import jdk.internal.misc.SharedSecrets;
33import jdk.internal.misc.JavaIOFileDescriptorAccess;
34import sun.security.action.GetPropertyAction;
35
36
37/**
38 * This class defines methods for creating SDP sockets or "converting" existing
39 * file descriptors, referencing (unbound) TCP sockets, to SDP.
40 */
41
42public final class SdpSupport {
43    private static final String os = GetPropertyAction.privilegedGetProperty("os.name");
44    private static final boolean isSupported = (os.equals("SunOS") || (os.equals("Linux")));
45    private static final JavaIOFileDescriptorAccess fdAccess =
46        SharedSecrets.getJavaIOFileDescriptorAccess();
47
48    private SdpSupport() { }
49
50    /**
51     * Creates a SDP socket, returning file descriptor referencing the socket.
52     */
53    public static FileDescriptor createSocket() throws IOException {
54        if (!isSupported)
55            throw new UnsupportedOperationException("SDP not supported on this platform");
56        int fdVal = create0();
57        FileDescriptor fd = new FileDescriptor();
58        fdAccess.set(fd, fdVal);
59        return fd;
60    }
61
62    /**
63     * Converts an existing file descriptor, that references an unbound TCP socket,
64     * to SDP.
65     */
66    public static void convertSocket(FileDescriptor fd) throws IOException {
67        if (!isSupported)
68            throw new UnsupportedOperationException("SDP not supported on this platform");
69        int fdVal = fdAccess.get(fd);
70        convert0(fdVal);
71    }
72
73    private static native int create0() throws IOException;
74
75    private static native void convert0(int fd) throws IOException;
76
77    static {
78        AccessController.doPrivileged(
79            new java.security.PrivilegedAction<Void>() {
80                public Void run() {
81                    System.loadLibrary("net");
82                    return null;
83                }
84            });
85    }
86}
87