105 lines
3.8 KiB
Java
105 lines
3.8 KiB
Java
/*
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* Copyright (c) 2013, 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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/*
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* @test
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* @bug 8021820
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* @summary The total number of file descriptors is limited to
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* 1024(FDSET_SIZE) on MacOSX (the size of fd array passed to select()
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* call in java.net classes is limited to this value).
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* @run main/othervm SelectFdsLimit
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* @author aleksej.efimov@oracle.com
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*/
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.FileNotFoundException;
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import java.io.IOException;
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import java.io.InputStream;
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import java.net.ServerSocket;
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import java.net.SocketTimeoutException;
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/*
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* Test must be run in othervm mode to ensure that all files
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* opened by openFiles() are closed propertly.
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*/
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public class SelectFdsLimit {
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static final int FDTOOPEN = 1023;
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static final String TESTFILE = "testfile";
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static FileInputStream [] testFIS;
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static void prepareTestEnv() throws IOException {
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File fileToCreate = new File(TESTFILE);
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if (!fileToCreate.exists())
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if (!fileToCreate.createNewFile())
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throw new RuntimeException("Can't create test file");
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}
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//If there will be some problem (i.e. ulimits on number of opened files will fail)
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//then this method will fail with exception and test will be considered as
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//failed. But allocated fds will be released because the test is executed by
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//dedicated VM (@run main/othervm).
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static void openFiles(int fn, File f) throws FileNotFoundException, IOException {
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testFIS = new FileInputStream[FDTOOPEN];
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for (;;) {
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if (0 == fn)
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break;
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FileInputStream fis = new FileInputStream(f);
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testFIS[--fn] = fis;
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}
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}
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public static void main(String [] args) throws IOException, FileNotFoundException {
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//The bug 8021820 is a Mac specific and because of that test will pass on all
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//other platforms
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if (!System.getProperty("os.name").contains("OS X")) {
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return;
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}
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//Create test directory with test files
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prepareTestEnv();
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//Consume FD ids for this java process to overflow the 1024
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openFiles(FDTOOPEN,new File(TESTFILE));
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//Wait for incoming connection and make the select() used in java.net
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//classes fail the limitation on FDSET_SIZE
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ServerSocket socket = new ServerSocket(0);
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//Set the minimal timeout, no one is
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//going to connect to this server socket
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socket.setSoTimeout(1);
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// The accept() call will throw SocketException if the
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// select() has failed due to limitation on fds size,
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// indicating test failure. A SocketTimeoutException
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// is expected, so it is caught and ignored, and the test
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// passes.
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try {
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socket.accept();
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} catch (SocketTimeoutException e) { }
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}
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}
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