/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import static java.nio.file.StandardOpenOption.*;
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import java.nio.file.*;
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import java.io.*;
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import java.util.*;
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public class Main {
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private static final String TEMP_FILE_NAME_PREFIX = "oflimit";
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private static final String TEMP_FILE_NAME_SUFFIX = ".txt";
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public static void main(String[] args) throws IOException {
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// Exhaust the number of open file descriptors.
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List<File> files = new ArrayList<File>();
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List<OutputStream> streams = new ArrayList<OutputStream>();
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try {
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for (int i = 0; ; i++) {
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File file = createTempFile();
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files.add(file);
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streams.add(Files.newOutputStream(file.toPath(), CREATE, APPEND));
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}
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} catch (Throwable e) {
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if (e.getMessage().contains("Too many open files")) {
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System.out.println("Message includes \"Too many open files\"");
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} else {
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System.out.println("Unexpected exception:");
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e.printStackTrace();
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}
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}
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// Now try to create a new thread.
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try {
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Thread thread = new Thread() {
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public void run() {
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System.out.println("thread run.");
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}
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};
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thread.start();
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thread.join();
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} catch (Throwable e) {
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System.out.println(e.getMessage());
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}
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for (int i = 0; i < streams.size(); i++) {
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streams.get(i).close();
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}
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for (int i = 0; i < files.size(); i++) {
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files.get(i).delete();
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}
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System.out.println("done.");
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}
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private static File createTempFile() throws Exception {
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try {
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return File.createTempFile(TEMP_FILE_NAME_PREFIX, TEMP_FILE_NAME_SUFFIX);
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} catch (IOException e) {
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System.setProperty("java.io.tmpdir", "/data/local/tmp");
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try {
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return File.createTempFile(TEMP_FILE_NAME_PREFIX, TEMP_FILE_NAME_SUFFIX);
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} catch (IOException e2) {
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System.setProperty("java.io.tmpdir", "/sdcard");
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return File.createTempFile(TEMP_FILE_NAME_PREFIX, TEMP_FILE_NAME_SUFFIX);
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}
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}
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}
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}
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