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