1 /*
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3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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8  * particular file as subject to the "Classpath" exception as provided
9  * by Oracle in the LICENSE file that accompanied this code.
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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  *
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24  */
25 
26 package sun.net.sdp;
27 
28 import java.io.IOException;
29 import java.io.FileDescriptor;
30 import java.security.AccessController;
31 
32 import sun.misc.SharedSecrets;
33 import sun.misc.JavaIOFileDescriptorAccess;
34 
35 
36 /**
37  * This class defines methods for creating SDP sockets or "converting" existing
38  * file descriptors, referencing (unbound) TCP sockets, to SDP.
39  */
40 
41 public final class SdpSupport {
42     private static final String os = AccessController
43         .doPrivileged(new sun.security.action.GetPropertyAction("os.name"));
44     private static final boolean isSupported = (os.equals("SunOS") || (os.equals("Linux")));
45     private static final JavaIOFileDescriptorAccess fdAccess =
46         SharedSecrets.getJavaIOFileDescriptorAccess();
47 
SdpSupport()48     private SdpSupport() { }
49 
50     /**
51      * Creates a SDP socket, returning file descriptor referencing the socket.
52      */
createSocket()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      */
convertSocket(FileDescriptor fd)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 
create0()73     private static native int create0() throws IOException;
74 
convert0(int fd)75     private static native void convert0(int fd) throws IOException;
76 
77     static {
AccessController.doPrivileged( new java.security.PrivilegedAction<Void>() { public Void run() { System.loadLibrary(R); return null; } })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