1 /* 2 * Copyright (c) 2010, 2019, 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 26 package sun.net.sdp; 27 28 import java.io.IOException; 29 import java.io.FileDescriptor; 30 31 import jdk.internal.access.SharedSecrets; 32 import jdk.internal.access.JavaIOFileDescriptorAccess; 33 import sun.security.action.GetPropertyAction; 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 = GetPropertyAction.privilegedGetProperty("os.name"); 43 private static final boolean isSupported = (os.equals("SunOS") || (os.equals("Linux"))); 44 private static final JavaIOFileDescriptorAccess fdAccess = 45 SharedSecrets.getJavaIOFileDescriptorAccess(); 46 47 private SdpSupport() { } 48 49 /** 50 * Creates a SDP socket, returning file descriptor referencing the socket. 51 */ 52 public static FileDescriptor createSocket() throws IOException { 53 if (!isSupported) 54 throw new UnsupportedOperationException("SDP not supported on this platform"); 55 int fdVal = create0(); 56 FileDescriptor fd = new FileDescriptor(); 57 fdAccess.set(fd, fdVal); 58 return fd; 59 } 60 61 /** 62 * Converts an existing file descriptor, that references an unbound TCP socket, 63 * to SDP. 64 */ 65 public static void convertSocket(FileDescriptor fd) throws IOException { 66 if (!isSupported) 67 throw new UnsupportedOperationException("SDP not supported on this platform"); 68 int fdVal = fdAccess.get(fd); 69 convert0(fdVal); 70 } 71 72 private static native int create0() throws IOException; 73 74 private static native void convert0(int fd) throws IOException; 75 76 static { 77 SharedSecrets.getJavaLangAccess().loadLibrary("net"); 78 } 79 }