Zombies.java revision 5116:d45bc4307996
1/* 2 * Copyright (c) 2006, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24/* 25 * @test 26 * @bug 6474073 27 * @summary Make sure zombies don't get created on Unix 28 * @author Martin Buchholz 29 */ 30 31import java.io.*; 32 33public class Zombies { 34 35 static final String os = System.getProperty("os.name"); 36 37 static final String TrueCommand = os.startsWith("Mac OS")? 38 "/usr/bin/true" : "/bin/true"; 39 40 public static void main(String[] args) throws Throwable { 41 if (! new File("/usr/bin/perl").canExecute() || 42 ! new File("/bin/ps").canExecute()) 43 return; 44 System.out.println("Looks like a Unix system."); 45 final Runtime rt = Runtime.getRuntime(); 46 47 try { 48 rt.exec("no-such-file"); 49 throw new Error("expected IOException not thrown"); 50 } catch (IOException _) {/* OK */} 51 52 try { 53 rt.exec("."); 54 throw new Error("expected IOException not thrown"); 55 } catch (IOException _) {/* OK */} 56 57 try { 58 rt.exec(TrueCommand, null, new File("no-such-dir")); 59 throw new Error("expected IOException not thrown"); 60 } catch (IOException _) {/* OK */} 61 62 rt.exec(TrueCommand).waitFor(); 63 64 // Count all the zombies that are children of this Java process 65 final String[] zombieCounter = { 66 "/usr/bin/perl", "-e", 67 "exit @{[`/bin/ps -eo ppid,s` =~ /^ *@{[getppid]} +Z$/mog]}" 68 }; 69 70 int zombies = rt.exec(zombieCounter).waitFor(); 71 if (zombies != 0) throw new Error(zombies + " zombies!"); 72 } 73} 74