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