run "sudo -i" command in java

[hsn]

hello everyone. i am trying to run the sudo -i command in my mac.
here is the code

	   String s = null;


        try {
            
	   
            
            p = Runtime.getRuntime().exec(str);
            
            stdInput = new BufferedReader(new InputStreamReader(p.getInputStream()));
            stdError = new BufferedReader(new InputStreamReader(p.getErrorStream()));

            // read the output from the command
            
            //System.out.println("Here is the standard output of the command:\n");
            /*while ((s = stdInput.readLine()) != null) {
                System.out.println(s);
            }
            
            // read any errors from the attempted command

            //System.out.println("Here is the standard error of the command (if any):\n");
            while ((s = stdError.readLine()) != null) {
                System.out.println(s);
            }
            */
            //System.exit(0);
        }
        catch (IOException e) {
            System.out.println("exception happened - here's what I know: ");
            e.printStackTrace();
            System.exit(-1);
        }
    }

in the beginning of the code p is the object of the Process class.

this code is in a function and i cal this function twice, the first time is to run the sudo -i command and the second one for entering the password,
the problem is when i enter the sudo -i command no output comes out. but for any other command the output comes out just fine.

if any one has any ideas i would be grateful

best regards
hsn

[hsn]

first of all, please remove the commented areas the /* and */
also, what i think the issue is that when you use this code with the sudo -i command the program pauses at line number 16. i checked it out it is not because of the while loop, if you remove the while loop the same issue will stay.

regards
hsn

[JosAH]

Your program blocks itself when the sudo sub-command wants input and doesn't produce any output. Use several threads for that purpose. This little article explains it all.

kind regards,

Jos

[hsn]

hello Jos. i have done the foloowing code

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;


public class tests implements Runnable {
	
	private static Process p,p2;
	private static Runtime rt;
	private static String str;
	
	public static void main (String [] args){
		try{
		
	        
	       
			tests t=new tests();
			str="sudo -i";
			t.run();
			str="qzvvp";
			t.run();
			 
			
		}
		catch(Exception e){
			e.printStackTrace();
			
		}
		
	}

	public void run() {
		String s="";
		try{ 
			rt=Runtime.getRuntime();
			
			p = rt.exec(str);
			 
	        System.out.println(p.waitFor());
	        BufferedReader  stdInput = new BufferedReader(new InputStreamReader(p.getInputStream()));
			while( (s=stdInput.readLine())!=null){
			System.out.println("> "+s);
			}
		}
		catch(Exception e){
			e.printStackTrace();
			
		}
	}
}

I CREATED a thread which will run the process object with the requested command. but still the system freezes after entering the sudo -i command.

[JosAH]

That code doesn't make any sense: you use a single thread and make it wait for the completion of the run process. Read that article and see how they do it.

kind regards,

Jos