Symptoms: read hangs even if the buffer has bytes in it.



[tester@tralus volkov]$ export PATH=/net/sqesvr/export/vsn/users/merlin/jdk1.3.1/linux-i386/bin:$PATH

[tester@tralus volkov]$ java -version
java version "1.3.1ea"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.1ea-b01)

[tester@tralus volkov]$ uname -a
Linux tralus.eng.sun.com 2.2.14-5.0 #1 Tue Mar 7 21:07:39 EST 2000 i686 unknown

//============================================================
import java.io.*;

public class Test {
    
    public void delay() {
        System.out.println("Sleeping");
        for (int i = 0;i < 1000000000;i++) ;
        
    }
// There are tow tests here. One is called if first argument is "one".
// It starts additiona thread and exeutes ls command.
// Second one executes "ls" with out thrad.
//
    public static void main(String[] argv) {
        String test = "one";
        if (argv != null && argv[0] != null)
            test = argv[0];
        Test ts = new Test();
// Run rn = new Run("/bin/sh -c /bin/echo");
        Run rn = new Run("/bin/sh -c /bin/ls /etc /usr /usr/X11 2>&1");
        if (test.compareTo("one") == 0) {
            Thread th = new Thread(rn);
            
            System.out.println("Starting");
            th.start();
            
            ts.delay();
            rn.kill();
            try {
                System.out.println("Joinnig");
                th.join();
            } catch (Exception e) {
                System.out.println("Exception: " + e.getMessage());
                e.printStackTrace();
            }
        } else {
            rn.run();
        }
    }
}

class Run implements Runnable {
    private String argv = null;
    private Process ps = null;

    public Run(String str) {
        argv = str;
    }

    public void run() {
        System.out.println("Started: ");
        try {
            ps = Runtime.getRuntime().exec(argv);
        } catch (Exception e) {
            System.out.println("Exception: " + e.getMessage());
            e.printStackTrace();
        }
        InputStream is = ps.getInputStream();
        byte buff[] = new byte[256];
        int res = 0;
        System.out.println("================ Output: ================");
        try {
// Test hangs here on the very first read.
            while ((res = is.read(buff, 0, 256)) != -1) {
                System.out.println(new String(buff, 0, res));
            }
        } catch (Exception e) {}
        System.out.println("================ ======= ================");
    }

    public void kill() {
        ps.destroy();
    }
}

alexei.volkov@eng 2000-09-26