1 /*
   2  * Copyright (c) 2018, 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.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 /**
  25  * A simplified Unix domain socket which can read and write bytes at a time
  26  * used for simulating external launchers which use UNIX sockets to talk
  27  * the VM.
  28  */
  29 
  30 import java.io.IOException;
  31 
  32 public class UnixDomainSocket {
  33 
  34     static {
  35         System.loadLibrary("InheritedChannel");
  36         init();
  37     }
  38 
  39     private final int fd;
  40 
  41     public UnixDomainSocket(int fd) {
  42         this.fd = fd;
  43     }
  44 
  45     public int read() throws IOException {
  46         return read0(fd);
  47     }
  48 
  49     public void write(int w) throws IOException {
  50         write0(fd, w);
  51     }
  52 
  53     public void close() {
  54         close0(fd);
  55     }
  56 
  57     public int fd() {
  58         return fd;
  59     }
  60 
  61     public String toString() {
  62         return "UnixDomainSocket: fd=" + Integer.toString(fd);
  63     }
  64 
  65     /* read and write bytes with UNIX domain sockets */
  66 
  67     private static native int read0(int fd) throws IOException;
  68     private static native void write0(int fd, int w) throws IOException;
  69     private static native void close0(int fd);
  70     private static native void init();
  71     public static native UnixDomainSocket[] socketpair();
  72 }
  73