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();
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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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