Quelle FeelingLucky.java Sprache: JAVA

/*
* Copyright (c) 2006, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/

/*
* A test for
* 6469606: (process) Process.destroy() can kill wrong process (Unix)
* that is not suitable for use as a regression test, because it must
* create 32768 processes, and depends on perl.
*/
import java.io.*;

public class FeelingLucky {

    public static void main(String[] args) throws Throwable {
        final Runtime rt = Runtime.getRuntime();
        final String[] pidPrinter = {"/bin/sh", "-c", "echo $$"};
        final Process minedProcess = rt.exec(pidPrinter);
        int minedPid = 0;
        final InputStream is = minedProcess.getInputStream();
        int c;
        while ((c = is.read()) >= '0' && c <= '9')
            minedPid = 10 * minedPid + (c - '0');
        System.out.printf("minedPid=%d%n", minedPid);
        minedProcess.waitFor();

        final String[] magnum = {
            "perl", "-e",
            "my $punk = getppid();" +
            "open TTY, '> /dev/tty';" +
            "print TTY \"punk=$punk\\n\";" +
            "for (my $i = 0; $i < 32768; $i++) {" +
            " my $pid = fork();" +
            " if ($pid == 0) {" +
            " if ($$ == " + minedPid + ") {" +
            " print TTY \"MATCH $$ $punk\\n\";" +
            " $SIG{TERM} = sub {" +
            " print TTY \"Got TERM $$ $punk\\n\";" +
            " kill 9, $punk;" +
            " exit; };" +
            " $| = 1; print 'Go ahead. Make my day.';" +
            " sleep 100;" +
            " }" +
            " exit;" +
            " } else { " +
            " waitpid($pid,0);" +
            " break if $pid == " + minedPid + ";" +
            " }" +
            "}"
        };

        Process p = rt.exec(magnum);
        if (p.getInputStream().read() != -1) {
            System.out.println("got a char");
            minedProcess.destroy();
            Thread.sleep(1000);
        }
    }
}

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