The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2007 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package android.net; |
| 18 | |
| 19 | import java.io.IOException; |
| 20 | import java.io.FileDescriptor; |
| 21 | |
| 22 | /** |
| 23 | * non-standard class for creating inbound UNIX-domain socket |
| 24 | * on the Android platform, this is created in the Linux non-filesystem |
| 25 | * namespace. |
| 26 | * |
| 27 | * On simulator platforms, this may be created in a temporary directory on |
| 28 | * the filesystem |
| 29 | */ |
| 30 | public class LocalServerSocket { |
| 31 | private final LocalSocketImpl impl; |
| 32 | private final LocalSocketAddress localAddress; |
| 33 | |
| 34 | /** 50 seems a bit much, but it's what was here */ |
| 35 | private static final int LISTEN_BACKLOG = 50; |
| 36 | |
| 37 | /** |
| 38 | * Crewates a new server socket listening at specified name. |
| 39 | * On the Android platform, the name is created in the Linux |
| 40 | * abstract namespace (instead of on the filesystem). |
| 41 | * |
| 42 | * @param name address for socket |
| 43 | * @throws IOException |
| 44 | */ |
| 45 | public LocalServerSocket(String name) throws IOException |
| 46 | { |
| 47 | impl = new LocalSocketImpl(); |
| 48 | |
| 49 | impl.create(true); |
| 50 | |
| 51 | localAddress = new LocalSocketAddress(name); |
| 52 | impl.bind(localAddress); |
| 53 | |
| 54 | impl.listen(LISTEN_BACKLOG); |
| 55 | } |
| 56 | |
| 57 | /** |
| 58 | * Create a LocalServerSocket from a file descriptor that's already |
| 59 | * been created and bound. listen() will be called immediately on it. |
| 60 | * Used for cases where file descriptors are passed in via environment |
| 61 | * variables |
| 62 | * |
| 63 | * @param fd bound file descriptor |
| 64 | * @throws IOException |
| 65 | */ |
| 66 | public LocalServerSocket(FileDescriptor fd) throws IOException |
| 67 | { |
| 68 | impl = new LocalSocketImpl(fd); |
| 69 | impl.listen(LISTEN_BACKLOG); |
| 70 | localAddress = impl.getSockAddress(); |
| 71 | } |
| 72 | |
| 73 | /** |
| 74 | * Obtains the socket's local address |
| 75 | * |
| 76 | * @return local address |
| 77 | */ |
| 78 | public LocalSocketAddress getLocalSocketAddress() |
| 79 | { |
| 80 | return localAddress; |
| 81 | } |
| 82 | |
| 83 | /** |
| 84 | * Accepts a new connection to the socket. Blocks until a new |
| 85 | * connection arrives. |
| 86 | * |
| 87 | * @return a socket representing the new connection. |
| 88 | * @throws IOException |
| 89 | */ |
| 90 | public LocalSocket accept() throws IOException |
| 91 | { |
| 92 | LocalSocketImpl acceptedImpl = new LocalSocketImpl(); |
| 93 | |
| 94 | impl.accept (acceptedImpl); |
| 95 | |
| 96 | return new LocalSocket(acceptedImpl); |
| 97 | } |
| 98 | |
| 99 | /** |
| 100 | * Returns file descriptor or null if not yet open/already closed |
| 101 | * |
| 102 | * @return fd or null |
| 103 | */ |
| 104 | public FileDescriptor getFileDescriptor() { |
| 105 | return impl.getFileDescriptor(); |
| 106 | } |
| 107 | |
| 108 | /** |
| 109 | * Closes server socket. |
| 110 | * |
| 111 | * @throws IOException |
| 112 | */ |
| 113 | public void close() throws IOException |
| 114 | { |
| 115 | impl.close(); |
| 116 | } |
| 117 | } |