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  /*
   * JBoss, Home of Professional Open Source
   * Copyright 2006, Red Hat Middleware LLC, and individual contributors
   * as indicated by the @author tags.
   * See the copyright.txt in the distribution for a
   * full listing of individual contributors.
   * This copyrighted material is made available to anyone wishing to use,
   * modify, copy, or redistribute it subject to the terms and conditions
   * of the GNU Lesser General Public License, v. 2.1.
  * This program is distributed in the hope that it will be useful, but WITHOUT A
  * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
  * PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more details.
  * You should have received a copy of the GNU Lesser General Public License,
  * v.2.1 along with this distribution; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  * MA  02110-1301, USA.
  *
  * (C) 2005-2006,
  * @author JBoss Inc.
  */
 /*
  * Copyright (C) 2001,
  *
  * Hewlett-Packard Arjuna Labs,
  * Newcastle upon Tyne,
  * Tyne and Wear,
  * UK.
  *
  * $Id: SocketProcessId.java 2342 2006-03-30 13:06:17Z  $
  */
 
 package com.arjuna.ats.internal.arjuna.utils;
 
 import java.io.File;
 
Obtains a unique value to represent the process id via reflection.
 
 
 public class ExecProcessId implements com.arjuna.ats.arjuna.utils.Process
 {

    

Returns:
the process id. This had better be unique between processes on the same machine. If not we're in trouble!
 
 
     public int getpid ()
     {
         synchronized (.)
         {
             if ( == -1)
             {
                 String cmd[] = null;
                 File tempFile = null;
 
                 if (System.getProperty("os.name").toLowerCase().indexOf(
                         "windows") == -1)
                     cmd = new String[]
                     { "/bin/sh""-c""echo $$ $PPID" };
                 else
                 {
                     try
                     {
                         // http://www.scheibli.com/projects/getpids/index.html (GPL)
                         tempFile = File.createTempFile("getpids""ts");
 
                         byte[] bytes = new byte[1024];
                         int read;
                         InputStream in  = ExecProcessId.class.getResourceAsStream("getpids.exe");
                         OutputStream out = new FileOutputStream(tempFile);
 
                         try
                         {
                             while ((read = in.read(bytes)) != -1)
                                 out.write(bytes, 0, read);
                         }
                         finally
                         {
                             in.close();
                             out.close();
                         }
 
                         cmd = new String[] { tempFile.getAbsolutePath() };
                     }
                     catch (final Exception ex)
                     {
                         throw new FatalError(
                                 ..get_utils_ExecProcessId_2() + " "+exex);
                     }
                }
                if (cmd != null)
                {
                    Process p = null;
                    try
                    {
                        p = Runtime.getRuntime().exec(cmd);
                    }
                    catch (final IOException ex)
                    {
                        throw new FatalError(
                                ..get_utils_ExecProcessId_3() + " "+exex);
                    }
                    ByteArrayOutputStream bstream = new ByteArrayOutputStream();
                    byte[] bytes = new byte[1024];
                    int read;
                    try
                    {
                        while ((read = p.getInputStream().read(bytes)) != -1)
                            bstream.write(bytes, 0, read);
                    }
                    catch (final Exception ex)
                    {
                        throw new FatalError(
                                ..get_utils_ExecProcessId_4() + " "+exex);
                    }
                    finally
                    {
                        try
                        {
                            bstream.close();
                        }
                        catch (final Exception ex) {
                            ..warn_utils_ExecProcessId_5(ex);
                        }
                    }
                    if (tempFile != null)
                        tempFile.delete();
                    StringTokenizer theTokenizer = new StringTokenizer(bstream.toString());
                    theTokenizer.nextToken();
                    String pid = theTokenizer.nextToken();
                    try
                    {
                         = Integer.parseInt(pid);
                    }
                    catch (final Exception ex)
                    {
                    }
                }
            }
        }
        if ( == -1)
            throw new FatalError(
                    ..get_utils_ExecProcessId_1());
        return ;
    }
    private static final Object _lock = new Object();
    private int _pid = -1;
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