engineering/java-topology
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

undefect. CWE-407 — 63 sites patched across 27 ecosystems

Browse source 
Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com

Patches, unit tests, benchmarks, whitepaper, and outreach briefs.
Public domain — no copyright claimed. Use freely.
This commit is contained in:
russell@unturf.com 2026-03-26 17:11:57 -04:00
commit 0a580b313d
70422 changed files with 17213626 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

212
test/jdk/java/nio/channels/Selector/ChangingInterests.java Normal file
View file

@ -0,0 +1,212 @@
/*
* Copyright (c) 2012, 2021, 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 7200742
* @key intermittent
* @summary Test that Selector doesn't spin when changing interest ops
*/
/* @test
* @requires (os.family == "windows")
* @run main/othervm -Djava.nio.channels.spi.SelectorProvider=sun.nio.ch.WindowsSelectorProvider ChangingInterests
*/
import java.net.*;
import java.nio.ByteBuffer;
import java.nio.channels.*;
import static java.nio.channels.SelectionKey.*;
import java.io.IOException;
public class ChangingInterests {
static int OPS[] = { 0, OP_WRITE, OP_READ, (OP_WRITE|OP_READ) };
static String toOpsString(int ops) {
String s = "";
if ((ops & OP_READ) > 0)
s += "POLLIN";
if ((ops & OP_WRITE) > 0) {
if (s.length() > 0)
s += "|";
s += "POLLOUT";
}
if (s.length() == 0)
s = "0";
return "(" + s + ")";
}
/**
* Writes two bytes to 'out' and reads one byte from 'in' so
* as to make 'in' readable.
*/
static void makeReadable(SocketChannel out, SocketChannel in) throws IOException {
out.write(ByteBuffer.wrap(new byte[2]));
ByteBuffer oneByte = ByteBuffer.wrap(new byte[1]);
do {
int n = in.read(oneByte);
if (n == 1) {
break;
} else if (n == 0) {
try {
Thread.sleep(50);
} catch (InterruptedException ignore) { }
} else {
throw new RuntimeException
("Expected to read 0 or 1 byte; actual number was " + n);
}
} while (true);
}
static void drain(SocketChannel sc) throws IOException {
ByteBuffer buf = ByteBuffer.allocate(100);
int n;
while ((n = sc.read(buf)) > 0) {
buf.rewind();
}
}
/**
* Changes the given key's interest set from one set to another and then
* checks the selected key set and the key's channel.
*/
static void testChange(SelectionKey key, int from, int to) throws IOException {
Selector sel = key.selector();
assertTrue(sel.keys().size() == 1, "Only one channel should be registered");
// ensure that channel is registered with the "from" interest set
key.interestOps(from);
sel.selectNow();
sel.selectedKeys().clear();
// change to the "to" interest set
key.interestOps(to);
System.out.println("select...");
int selected = sel.selectNow();
System.out.println("" + selected + " channel(s) selected");
int expected = (to == 0) ? 0 : 1;
assertTrue(selected == expected, "Expected " + expected);
// check selected keys
for (SelectionKey k: sel.selectedKeys()) {
assertTrue(k == key, "Unexpected key selected");
boolean readable = k.isReadable();
boolean writable = k.isWritable();
System.out.println("key readable: " + readable);
System.out.println("key writable: " + writable);
if ((to & OP_READ) == 0) {
assertTrue(!readable, "Not expected to be readable");
} else {
assertTrue(readable, "Expected to be readable");
}
if ((to & OP_WRITE) == 0) {
assertTrue(!writable, "Not expected to be writable");
} else {
assertTrue(writable, "Expected to be writable");
}
sel.selectedKeys().clear();
}
}
/**
* Tests that given Selector's select method blocks.
*/
static void testForSpin(Selector sel) throws IOException {
System.out.println("Test for spin...");
long start = System.currentTimeMillis();
int count = 3;
while (count-- > 0) {
int selected = sel.select(1000);
System.out.println("" + selected + " channel(s) selected");
assertTrue(selected == 0, "Channel should not be selected");
}
long dur = System.currentTimeMillis() - start;
assertTrue(dur > 1000, "select was too short");
}
public static void main(String[] args) throws IOException {
InetAddress lh = InetAddress.getLocalHost();
// create loopback connection
ServerSocketChannel ssc =
ServerSocketChannel.open().bind(new InetSocketAddress(0));
final SocketChannel sc = SocketChannel.open();
sc.setOption(StandardSocketOptions.TCP_NODELAY, true);
sc.connect(new InetSocketAddress(lh, ssc.socket().getLocalPort()));
SocketChannel peer = ssc.accept();
peer.setOption(StandardSocketOptions.TCP_NODELAY, true);
sc.configureBlocking(false);
// ensure that channel "sc" is readable
makeReadable(peer, sc);
try (Selector sel = Selector.open()) {
SelectionKey key = sc.register(sel, 0);
sel.selectNow();
// test all transitions
for (int from: OPS) {
for (int to: OPS) {
System.out.println(toOpsString(from) + " -> " + toOpsString(to));
testChange(key, from, to);
// if the interst ops is now 0 then Selector should not spin
if (to == 0)
testForSpin(sel);
// if interest ops is now OP_READ then make non-readable
// and test that Selector does not spin.
if (to == OP_READ) {
System.out.println("Drain channel...");
drain(sc);
testForSpin(sel);
System.out.println("Make channel readable again");
makeReadable(peer, sc);
}
System.out.println();
}
}
} finally {
sc.close();
peer.close();
ssc.close();
}
}
static void assertTrue(boolean v, String msg) {
if (!v) throw new RuntimeException(msg);
}
}