CODEWITHSUNDEEP
javaprocess
shriguru nayak
shriguru nayak

Reputation: 310

How to kill a child process started by process in java?

In the below code snippet, if I destroy Process p using p.destroy() only process p(i.e.cmd.exe) is getting destroyed. But not its child iperf.exe. How to terminate this process in Java.

Process p= Runtime.getRuntime().exec("cmd /c iperf -s > testresult.txt");

Upvotes: 3

Views: 5772

Answers (3)

Vijay Sanap
Vijay Sanap

Reputation: 1

You can refer following code snippet:

public class Test {

public static void main(String args[]) throws Exception {


    final Process process = Runtime.getRuntime().exec("notepad.exe");

        //if killed abnormally ( For Example using ^C from cmd)
        Runtime.getRuntime().addShutdownHook(new Thread() {

            @Override
            public void run() {

                process.destroy();
                System.out.println(" notepad killed ");
            }


        });





}
}

Upvotes: -1

Ian Roberts
Ian Roberts

Reputation: 122424

In Java 7 ProcessBuilder can do the redirection for you, so just run iperf directly rather than through cmd.exe.

ProcessBuilder pb = new ProcessBuilder("iperf", "-s");
pb.redirectOutput(new File("testresult.txt"));
Process p = pb.start();

The resulting p is now itext itself, so destroy() will work as you require.

Upvotes: 3

tbodt
tbodt

Reputation: 17017

You should use this code instead:

Process p= Runtime.getRuntime().exec("iperf -s");
InputStream in = p.getInputStream();
FileOutputStream out = new FileOutputStream("testresult.txt");
byte[] bytes;
in.read(bytes);
out.write(bytes);

This code will not work exactly, but you just need to fiddle with the streams a little.

Upvotes: 1

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