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