Hi Martin,
I vaguely remember that there are native approaches (see
http://stackoverflow.com/questions/1230669/subprocess-deleting-child-processes-in-windows)
to determine process groups under Windows but I don't know of any
portable Java-based solution.
In other words
* we are facing actually a Windows OS problem
* currently there is no solution for it
Cheers,
Siegfried Goeschl
On 02.02.15 15:42, Martin Gainty wrote:
Date: Mon, 2 Feb 2015 10:45:44 +0100
From: [email protected]
To: [email protected]
Subject: Re: [exec] Can't kill process?
Mhmm - see
https://msdn.microsoft.com/en-us/library/windows/desktop/ms686722(v=vs.85).aspx
MG>dont know if calling Paul Allen out of retirement to get this fixed would be
an immediate solution
MG>Are you envisioning commons collection (possibly TreeList) which contains
all process handles?
https://commons.apache.org/proper/commons-collections/javadocs/api-3.2.1/org/apache/commons/collections/list/TreeList.html
MG>walking thru parent and all Child handles to Call TerminateProcess with
WaitForSingleObject on each handle?
https://msdn.microsoft.com/en-us/library/windows/desktop/ms687036%28v=vs.85%29.aspx
MG>Thoughts?
On 02.02.15 10:23, Peter Ashford wrote:
So is there no way to make something like this work?
ps: 4770092 doesn't bring anything up in the Java bug database. And that
killing-child-process anchor doesn't seem to exist either.
On 2 February 2015 at 21:28, [email protected] <
[email protected]> wrote:
Hi Peter,
I think you are starting two processes under Windows
* one command line interpreter
* the second one is the "hg log" command which is a child process of the
command line interpreter
When you kill the process the command line interpreter is killed but the
second one (child process) is very likely still running since Windows has
no real concept of a parent pid
* http://commons.apache.org/proper/commons-exec/faq.html#
killing-child-processes
* http://bugs.java.com/bugdatabase/view_bug.do?bug_id=4770092
Cheers,
Siegfried Goeschl
On 02.02.15 04:35, Peter Ashford wrote:
Hi there
I'm trying to use ExecuteWatchDog.destroyProcess() to kill a running
process but it doesn't seem to work. I've pasted a minimal test case
below
which shows what I'm trying to do: it creates a frame with a text area
which the process output is echoed to. I've set it up so that ctrl + c
should kill the running process but it doesn't appear to work.
This test case changes directory to y:\ (my mapped drive where my
mercurial
repository lives) and does a "hg log" which runs for a long time on my
machine, giving me time to kill the process). If you wanted to run this
test, you'd have to choose a directory and long running process
appropriate
for your machine.
I've confirmed that the break signal is being received - there's a write
to
std.err in the code that executes correctly.
If anyone could help me with this, i'd really appreciate it!
Cheers!
Peter.
----------------
package jcon2;
import java.awt.Dimension;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.ScrollPaneConstants;
import javax.swing.UIManager;
import javax.swing.text.Document;
import org.apache.commons.exec.*;
public class Test implements KeyListener {
JFrame frame;
JTextArea text;
Document textDoc;
boolean breakFlag = false;
boolean execProcessRunning;
File currentDir = new File("y:\\");
BufferedOutputStream execIn;
class JCStream extends OutputStream {
public void write(int b) throws IOException {
writeCon(new String(new byte[]{ (byte) b}));
moveCaretToEnd();
}
}
public Test(){
frame = new JFrame("JCon2");
text = new JTextArea();
textDoc = text.getDocument();
JScrollPane scroller = new JScrollPane(text);
scroller.setHorizontalScrollBarPolicy(ScrollPaneConstants.
HORIZONTAL_SCROLLBAR_NEVER);
frame.add(scroller);
frame.setPreferredSize(new Dimension(600,800));
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
text.addKeyListener(this);
frame.pack();
frame.setVisible(true);
}
/**
* Write to the console
* @param str The text to write
*/
private void writeCon(String str){
try {
if(str != null && str.length()>0){
textDoc.insertString(textDoc.getLength(), str, null);
}
} catch (Exception ex) {
// ignore
}
}
private void moveCaretToEnd(){
text.setCaretPosition(text.getDocument().getLength());
}
private void processCommand(String cmd) {
writeCon("\n");
DefaultExecutor ex = new DefaultExecutor();
CommandLine cmdLine;
cmdLine = new CommandLine("cmd.exe");
cmdLine.addArguments("/E:1900 /C " + cmd);
new Thread(()-> {
JCStream out = new JCStream();
PumpStreamHandler streamHandler = new
PumpStreamHandler(out, out, System.in);
ex.setStreamHandler(streamHandler);
ex.setWorkingDirectory(currentDir);
ex.setExitValues(null);
breakFlag = false;
ExecuteWatchdog watchDog = new
ExecuteWatchdog(ExecuteWatchdog.INFINITE_TIMEOUT);
ex.setWatchdog(watchDog);
new Thread(()->{
while(execProcessRunning){
if(breakFlag){
System.err.println("Break!"); // <<< this
happens on ctrl + c
watchDog.destroyProcess(); // <<< but
output to textarea isn't stopped
breakFlag = false;
return;
}
try {
Thread.sleep(50);
} catch (InterruptedException ex1) {
// ignore
}
}
}).start();
try {
execProcessRunning = true;
ex.execute(cmdLine);
} catch (IOException ex1) {
// ignore
}
execProcessRunning = false;
writeCon("\n");
}
).start();
}
public void keyPressed(KeyEvent e) {
int keyCode = e.getKeyCode();
if(e.isControlDown() && keyCode == KeyEvent.VK_C){
e.consume();
breakFlag = true;
}
}
public void keyTyped(KeyEvent e) {}
public void keyReleased(KeyEvent e) {}
public static void main(String[] args) {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch(Exception e){
// don't care
}
Test t = new Test();
t.processCommand("hg log");
}
}
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