ExecWithDir.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
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 * 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).
 *
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 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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/* @test
 * @bug 4750978
 * @run main/othervm/timeout=300 ExecWithDir
 * @summary Ensure that we can fork-and-exec repeatedly when a new working
 *          directory is specified
 */

import java.io.File;

public class ExecWithDir {

    private static final int N = 500;

    public static void main(String args[]) throws Exception {
        if (! UnixCommands.isUnix) {
            System.out.println("For UNIX only");
            return;
        }
        UnixCommands.ensureCommandsAvailable("true");

        final String trueCmd = UnixCommands.findCommand("true");
        File dir = new File(".");
        for (int i = 1; i <= N; i++) {
            System.out.print(i);
            System.out.print(" e");
            Process p = Runtime.getRuntime().exec(trueCmd, null, dir);
            System.out.print('w');
            int s = p.waitFor();
            System.out.println("x " + s);
            if (s != 0) throw new Error("Unexpected return code " + s);

            // Avoid "Too many open files"
            p.getInputStream().close();
            p.getOutputStream().close();
            p.getErrorStream().close();
        }
    }
}