I face a process handling problem

**drhowarddrfine** · Jan 27 '07, 06:29 PM

If you need a Java answer then I'd ask in the Java board, otherwise, I can only give a C answer after I look up a detail I forgot.

**horace1** · Jan 30 '07, 08:02 AM

Originally posted by dmjpro

I run process on unix through runtime.exec() method.
But my process termintaes before chid process terminates.
How can I trap that child process termination.
The process.waitfor method block for while until the process terminates..
Can anyone tell me how can I get process information randomly until the main process terminates and it's child processes also throgh java..
Plz send me the solution immediately

this starts a child process and receives and displays its output - is that what you require?

Code:

// execute a child process using java exec command and get output

import java.io.*;
import java.lang.*;

public class JavaExec {

public static void main (String args[]){
  try {
     // get runtime environment and execute child process
     Runtime systemShell = Runtime.getRuntime();
     Process output = systemShell.exec("java -jar hello.jar");
     // open reader to get output from process
     BufferedReader br = new BufferedReader (new InputStreamReader(output.getInputStream()));
     String line = null;
     System.out.println("<OUTPUT/>");
      while((line = br.readLine()) != null ) 
         { System.out.println(line);  }          // display process output
     System.out.println("</OUTPUT>");
     int exitVal = output.waitFor();             // get process exit value
     System.out.println("Process Exit Value : "+ exitVal);
     }
   catch (IOException ioe){ System.err.println(ioe); }
   catch (Throwable t) { t.printStackTrace();}
}
}

I face a process handling problem

I face a process handling problem

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