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      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 }
    118