Example #1
0
  /**
   * Executes a command as {@code user}. Saves the stdout/stderr in the corresponding fields and
   * returns the return code of the child process.
   *
   * @param cmd The command to execute
   * @param data The data to send to the stdin of the process
   * @param timelimt How many seconds the command can run
   * @param memlimit How many megabytes the command can use
   */
  private int exec(String cmdS, String data, int timelimit, int memlimit) throws Exception {
    ArrayList<String> cmd = new ArrayList<String>(cmdPrefix);
    cmd.add("-m");
    cmd.add("" + memlimit);
    cmd.add("-c");
    cmd.add("" + timelimit);
    cmd.add("-w");
    cmd.add("" + (3 * timelimit + 1));
    cmd.add("-x");
    cmd.add(cmdS);
    String tmp = "";
    for (String cs : cmd) tmp += " \"" + cs + "\"";
    log.fine("exec " + tmp);
    ProcessBuilder pb = new ProcessBuilder(cmd);
    pb.directory(workDir);
    Process p = pb.start();
    OutputStreamWriter writer = new OutputStreamWriter(p.getOutputStream());
    StreamReader rOut = new StreamReader(p.getInputStream());
    StreamReader rErr = new StreamReader(p.getErrorStream());
    rOut.start();
    rErr.start();

    // TODO I think this may block for big tests. Check and Fix.
    // send and receive data "in parallel"
    writer.write(data);
    writer.flush();
    writer.close();
    rOut.join();
    rErr.join();
    stdout = rOut.result;
    stderr = rErr.result;
    if (rOut.exception != null) throw rOut.exception;
    if (rErr.exception != null) throw rErr.exception;

    // log.finer("out: " + stdout);
    // log.finer("err: " + stderr);
    // log.finer("done exec");
    return p.waitFor();
  }
Example #2
0
 public static void copyBytes(InputStream input, OutputStream output) throws Exception {
   StreamReader reader = new StreamReader(input);
   while (!reader.isEof()) output.write(reader.readBytes(1000));
 }