Question

I have just created a process through an exec() call and I am now using
its .waitFor() method. I need to catch an InterruptedException but I am
not sure what I should place in the catch code block.
I would like to receive the exit code but I won’t if the current thread
is interrupted. What should I do to get the exit code out of the process
if the thread is interrupted?

Example:

import java.io.IOException;


public class Exectest {
public static void main(String args[]){
      int exitval;

      try {
        Process p = Runtime.getRuntime().exec("ls -la ~/");
        exitval = p.waitFor();
        System.out.println(exitval);
    } catch (IOException e) {
        //Call failed, notify user.
    } catch (InterruptedException e) {
        //waitFor() didn't complete. I still want to get the exit val. 
        e.printStackTrace();
    }

}
}

Answer 1

If I were you, I’d put this into the catch block:

p.destroy();
exitval = p.exitValue();

Since your thread has been interrupted, something has gone wrong. destroy() will forcibly terminate the process, and then exitValue() will give you the exit value (which should be an error code since it’s been terminated).

More http://download.oracle.com/javase/1.4.2/docs/api/java/lang/Process.html