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/*
* Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/* @test
* @bug 8203059
* @summary Test SocketChannel.close with SO_LINGER enabled
*/
import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.StandardSocketOptions;
import java.nio.ByteBuffer;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
public class LingerOnClose {
private enum TestMode {
BLOCKING,
NON_BLOCKING,
NON_BLOCKING_AND_REGISTERED;
}
public static void main(String[] args) throws IOException {
// blocking mode
test(TestMode.BLOCKING, -1);
test(TestMode.BLOCKING, 0);
test(TestMode.BLOCKING, 1);
// non-blocking mode
test(TestMode.NON_BLOCKING, -1);
test(TestMode.NON_BLOCKING, 0);
test(TestMode.NON_BLOCKING, 1);
// non-blocking mode, close while registered with Selector
test(TestMode.NON_BLOCKING_AND_REGISTERED, -1);
test(TestMode.NON_BLOCKING_AND_REGISTERED, 0);
test(TestMode.NON_BLOCKING_AND_REGISTERED, 1);
}
/**
* Test closing a SocketChannel with SO_LINGER set to the given linger
* interval. If the linger interval is 0, it checks that the peer observes
* a connection reset (TCP RST).
*/
static void test(TestMode mode, int interval) throws IOException {
SocketChannel sc = null;
SocketChannel peer = null;
Selector sel = null;
try (ServerSocketChannel ssc = ServerSocketChannel.open()) {
ssc.bind(new InetSocketAddress(InetAddress.getLocalHost(), 0));
// establish loopback connection
sc = SocketChannel.open(ssc.getLocalAddress());
peer = ssc.accept();
// configured blocking mode and register with Selector if needed
if (mode != TestMode.BLOCKING)
sc.configureBlocking(false);
if (mode == TestMode.NON_BLOCKING_AND_REGISTERED) {
sel = Selector.open();
sc.register(sel, SelectionKey.OP_READ);
sel.selectNow();
}
// enable or disable SO_LINGER
sc.setOption(StandardSocketOptions.SO_LINGER, interval);
// close channel and flush Selector if needed
sc.close();
if (mode == TestMode.NON_BLOCKING_AND_REGISTERED)
sel.selectNow();
// read other end of connection, expect EOF or RST
ByteBuffer bb = ByteBuffer.allocate(100);
try {
int n = peer.read(bb);
if (interval == 0) {
throw new RuntimeException("RST expected");
} else if (n != -1) {
throw new RuntimeException("EOF expected");
}
} catch (IOException ioe) {
if (interval != 0) {
// exception not expected
throw ioe;
}
}
} finally {
if (sc != null) sc.close();
if (peer != null) peer.close();
if (sel != null) sel.close();
}
}
}
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