/*
* 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
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* questions.
*/
/**
* @test
* @bug 6921885
* @run main/othervm SiblingIOEHandle
* @summary inherit IOE handles and MS CreateProcess limitations (kb315939)
*/
import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.concurrent.BrokenBarrierException;
import java.util.concurrent.CyclicBarrier;
public class SiblingIOEHandle {
private static enum APP {
B, C;
}
private static File stopC = new File(".\\StopCs.txt");
private static String SIGNAL = "B child reported.";
private static String JAVA_EXE = System.getProperty("java.home")
+ File.separator + "bin"
+ File.separator + "java";
private static String[] getCommandArray(String processName) {
String[] cmdArray = {
JAVA_EXE,
"-cp",
System.getProperty("java.class.path"),
SiblingIOEHandle.class.getName(),
processName
};
return cmdArray;
}
public static void main(String[] args) {
if (!System.getProperty("os.name").startsWith("Windows")) {
return;
}
if (args.length > 0) {
APP app = APP.valueOf(args[0]);
switch (app) {
case B:
performB();
break;
case C:
performC();
break;
}
return;
}
performA(true);
performA(false);
}
static boolean procClaunched = false;
private static void waitAbit() {
try {
Thread.sleep(0);
} catch (InterruptedException ex) {
// that was long enough
}
}
private static boolean waitBarrier(CyclicBarrier barrier) {
while (true) try {
barrier.await();
return true;
} catch (InterruptedException ex) {
continue;
} catch (BrokenBarrierException ex) {
ex.printStackTrace();
return false;
}
}
private static void performA(boolean fileOut) {
try {
stopC.delete();
ProcessBuilder builderB = new ProcessBuilder(
getCommandArray(APP.B.name()));
File outB = null;
if (fileOut) {
outB = new File("outB.txt");
builderB.redirectOutput(outB);
}
builderB.redirectErrorStream(true);
final CyclicBarrier barrier = new CyclicBarrier(2);
Thread procCRunner = new Thread(new Runnable() {
@Override public void run() {
try {
if (waitBarrier(barrier)) {
waitAbit();
// Run process C next to B ASAP to make an attempt
// to capture the B-process IOE handles in C process.
Runtime.getRuntime().exec(getCommandArray(APP.C.name()));
procClaunched = true;
}
} catch (IOException ex) {
ex.printStackTrace();
}
}
});
procCRunner.start();
if (!waitBarrier(barrier)) {
throw new Error("Catastrophe in process A! Synchronization failed.");
}
// Run process B first.
Process processB = builderB.start();
while (true) try {
procCRunner.join();
break;
} catch (InterruptedException ex) {
continue;
}
if (!procClaunched) {
throw new Error("Catastrophe in process A! C was not launched.");
}
processB.getOutputStream().close();
processB.getErrorStream().close();
if (fileOut) {
try {
processB.waitFor();
} catch (InterruptedException ex) {
throw new Error("Catastrophe in process B! B hung up.");
}
System.err.println("Trying to delete [outB.txt].");
if (!outB.delete()) {
throw new Error("Greedy brother C deadlock! File share.");
}
System.err.println("Succeeded in delete [outB.txt].");
} else {
System.err.println("Read stream start.");
try (BufferedReader in = new BufferedReader( new InputStreamReader(
processB.getInputStream(), "utf-8")))
{
String result;
while ((result = in.readLine()) != null) {
if (!SIGNAL.equals(result)) {
throw new Error("Catastrophe in process B! Bad output.");
}
}
}
System.err.println("Read stream finished.");
}
// If JDK-6921885 is not fixed that point is unreachable.
// Test timeout exception.
// write signal file to stop C process.
stopC.createNewFile();
} catch (IOException ex) {
throw new Error("Catastrophe in process A!", ex);
}
}
private static void performB() {
System.out.println(SIGNAL);
}
private static void performC() {
// If JDK-7147084 is not fixed the loop is 5min long.
for (int i = 0; i < 5*60; ++i) {
try {
Thread.sleep(1000);
// check for sucess
if (stopC.exists())
break;
} catch (InterruptedException ex) {
// that is ok. Longer sleep - better effect.
}
}
}
}