071bd521bc
Reviewed-by: alanb, bchristi, dcubed, dfuchs, eosterlund, erikj, glaubitz, ihse, iignatyev, jjiang, kbarrett, ksrini, kvn, naoto, prr, rriggs, serb, sspitsyn, stefank, tschatzl, valeriep, weijun, weijun
84 lines
2.7 KiB
Java
84 lines
2.7 KiB
Java
/*
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* Copyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/* Test utilities
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*
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*/
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import java.io.*;
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import java.net.*;
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import java.nio.channels.*;
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import java.util.Random;
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public class TestUtil {
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// Test hosts used by the channels tests - change these when
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// executing in a different network.
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public static final String UNRESOLVABLE_HOST = "blah-blah.blah-blah.blah";
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private TestUtil() { }
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// Repeatedly try random ports until we bind to one. You might be tempted
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// to do this:
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//
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// ServerSocketChannel ssc = ServerSocketChannel.open();
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// ssc.socket().bind(new InetSocketAddress(0));
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// SocketAddress sa = ssc.socket().getLocalSocketAddress();
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//
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// but unfortunately it doesn't work on NT 4.0.
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//
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// Returns the bound port.
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//
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static int bind(ServerSocketChannel ssc) throws IOException {
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InetAddress lh = InetAddress.getLocalHost();
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Random r = new Random();
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for (;;) {
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int p = r.nextInt((1 << 16) - 1024) + 1024;
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InetSocketAddress isa = new InetSocketAddress(lh, p);
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try {
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ssc.socket().bind(isa);
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} catch (IOException x) {
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continue;
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}
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return p;
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}
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}
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// A more convenient form of bind(ServerSocketChannel) that returns a full
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// socket address.
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//
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static InetSocketAddress bindToRandomPort(ServerSocketChannel ssc)
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throws IOException
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{
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int p = bind(ssc);
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return new InetSocketAddress(InetAddress.getLocalHost(), p);
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}
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private static String osName = System.getProperty("os.name");
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static boolean onWindows() {
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return osName.startsWith("Windows");
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}
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}
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