1 /* 2 * Copyright (C) 2016 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 import static java.nio.file.StandardOpenOption.*; 18 import java.nio.file.*; 19 import java.io.*; 20 import java.util.*; 21 22 public class Main { 23 private static final String TEMP_FILE_NAME_PREFIX = "oflimit"; 24 private static final String TEMP_FILE_NAME_SUFFIX = ".txt"; 25 26 public static void main(String[] args) throws IOException { 27 28 // Exhaust the number of open file descriptors. 29 List<File> files = new ArrayList<File>(); 30 List<OutputStream> streams = new ArrayList<OutputStream>(); 31 try { 32 for (int i = 0; ; i++) { 33 File file = createTempFile(); 34 files.add(file); 35 streams.add(Files.newOutputStream(file.toPath(), CREATE, APPEND)); 36 } 37 } catch (Throwable e) { 38 if (e.getMessage().contains("Too many open files")) { 39 System.out.println("Message includes \"Too many open files\""); 40 } else { 41 System.out.println(e.getMessage()); 42 } 43 } 44 45 // Now try to create a new thread. 46 try { 47 Thread thread = new Thread() { 48 public void run() { 49 System.out.println("thread run."); 50 } 51 }; 52 thread.start(); 53 thread.join(); 54 } catch (Throwable e) { 55 System.out.println(e.getMessage()); 56 } 57 58 for (int i = 0; i < streams.size(); i++) { 59 streams.get(i).close(); 60 } 61 62 for (int i = 0; i < files.size(); i++) { 63 files.get(i).delete(); 64 } 65 System.out.println("done."); 66 } 67 68 private static File createTempFile() throws Exception { 69 try { 70 return File.createTempFile(TEMP_FILE_NAME_PREFIX, TEMP_FILE_NAME_SUFFIX); 71 } catch (IOException e) { 72 System.setProperty("java.io.tmpdir", "/data/local/tmp"); 73 try { 74 return File.createTempFile(TEMP_FILE_NAME_PREFIX, TEMP_FILE_NAME_SUFFIX); 75 } catch (IOException e2) { 76 System.setProperty("java.io.tmpdir", "/sdcard"); 77 return File.createTempFile(TEMP_FILE_NAME_PREFIX, TEMP_FILE_NAME_SUFFIX); 78 } 79 } 80 } 81 } 82
