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src/java.desktop/unix/classes/sun/awt/X11GraphicsEnvironment.java

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   1 /*
   2  * Copyright (c) 1997, 2015, 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.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any


 227 
 228         int shm = checkShmExt();
 229         if (shm != -1) {
 230             return (shm == 1);
 231         }
 232 
 233         // If XServer doesn't support ShMem extension,
 234         // try the other way
 235 
 236         String display = getDisplayString();
 237         int ind = display.indexOf(':');
 238         final String hostName = display.substring(0, ind);
 239         if (ind <= 0) {
 240             // ':0' case
 241             return true;
 242         }
 243 
 244         Boolean result = java.security.AccessController.doPrivileged(
 245             new java.security.PrivilegedAction<Boolean>() {
 246             public Boolean run() {
 247                 InetAddress remAddr[] = null;
 248                 Enumeration<InetAddress> locals = null;
 249                 Enumeration<NetworkInterface> interfaces = null;
 250                 try {
 251                     interfaces = NetworkInterface.getNetworkInterfaces();
 252                     remAddr = InetAddress.getAllByName(hostName);
 253                     if (remAddr == null) {
 254                         return Boolean.FALSE;
 255                     }
 256                 } catch (UnknownHostException e) {
 257                     System.err.println("Unknown host: " + hostName);
 258                     return Boolean.FALSE;
 259                 } catch (SocketException e1) {
 260                     System.err.println(e1.getMessage());
 261                     return Boolean.FALSE;
 262                 }
 263 
 264                 for (; interfaces.hasMoreElements();) {
 265                     locals = interfaces.nextElement().getInetAddresses();
 266                     for (; locals.hasMoreElements();) {
 267                         final InetAddress localAddr = locals.nextElement();


   1 /*
   2  * Copyright (c) 1997, 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.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any


 227 
 228         int shm = checkShmExt();
 229         if (shm != -1) {
 230             return (shm == 1);
 231         }
 232 
 233         // If XServer doesn't support ShMem extension,
 234         // try the other way
 235 
 236         String display = getDisplayString();
 237         int ind = display.indexOf(':');
 238         final String hostName = display.substring(0, ind);
 239         if (ind <= 0) {
 240             // ':0' case
 241             return true;
 242         }
 243 
 244         Boolean result = java.security.AccessController.doPrivileged(
 245             new java.security.PrivilegedAction<Boolean>() {
 246             public Boolean run() {
 247                 InetAddress[] remAddr = null;
 248                 Enumeration<InetAddress> locals = null;
 249                 Enumeration<NetworkInterface> interfaces = null;
 250                 try {
 251                     interfaces = NetworkInterface.getNetworkInterfaces();
 252                     remAddr = InetAddress.getAllByName(hostName);
 253                     if (remAddr == null) {
 254                         return Boolean.FALSE;
 255                     }
 256                 } catch (UnknownHostException e) {
 257                     System.err.println("Unknown host: " + hostName);
 258                     return Boolean.FALSE;
 259                 } catch (SocketException e1) {
 260                     System.err.println(e1.getMessage());
 261                     return Boolean.FALSE;
 262                 }
 263 
 264                 for (; interfaces.hasMoreElements();) {
 265                     locals = interfaces.nextElement().getInetAddresses();
 266                     for (; locals.hasMoreElements();) {
 267                         final InetAddress localAddr = locals.nextElement();


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