1 /*
2 * junixsocket
3 *
4 * Copyright 2009-2024 Christian Kohlschütter
5 *
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 */
18 package org.newsclub.net.unix;
19
20 import java.io.IOException;
21
22 /**
23 * VSOCK-specific code that resides in the native library. To be used by {@code AFVSOCKSocket} and
24 * {@code AFVSOCKDatagramSocket} only.
25 *
26 * @author Christian Kohlschütter
27 */
28 public final class AFVSOCKSocketImplExtensions implements
29 AFSocketImplExtensions<AFVSOCKSocketAddress> {
30 @SuppressWarnings("unused")
31 private final AncillaryDataSupport ancillaryDataSupport; // NOPMD
32
33 AFVSOCKSocketImplExtensions(AncillaryDataSupport ancillaryDataSupport) {
34 this.ancillaryDataSupport = ancillaryDataSupport;
35 }
36
37 /**
38 * Returns the local CID.
39 *
40 * If the system does not support vsock, or status about support cannot be retrieved, -1
41 * ({@link AFVSOCKSocketAddress#VMADDR_CID_ANY}) is returned.
42 *
43 * The value may be cached upon initialization of the library.
44 *
45 * @return The CID, or -1.
46 * @throws IOException on error.
47 */
48 public int getLocalCID() throws IOException {
49 return NativeUnixSocket.vsockGetLocalCID();
50 }
51 }