/*
 * $Id: ProcessContext.java,v 1.4 2001/10/07 23:48:55 rayo Exp $
 */

/*
 * $Log: ProcessContext.java,v $
 * Revision 1.4  2001/10/07 23:48:55  rayo
 * added author javadoc tag
 *
 * Revision 1.3  2001/09/13 23:22:21  rayo
 * Added support for openFiles
 *
 * Revision 1.2  2001/09/11 04:02:23  rayo
 * fixed constructor
 *
 * Revision 1.1  2001/09/11 03:27:56  rayo
 * Initial revision
 *
 */

/**
 * A process context.  This contains all information needed
 * by the file system which is specific to a process.
 * @author Ray Ontko
 */
public class ProcessContext
{

  /**
   * Number of last error.
   * <p>
   * Simulates the unix system variable:
   * <pre>
   *   extern int errno;
   * </pre>
   */
  public int errno = 0 ;

  /**
   * The uid for the process.
   */
  private short uid = 1 ;

  /**
   * The gid for the process.
   */
  private short gid = 1 ;

  /**
   * The working directory for the process.
   */
  private String dir = "/root" ;

  /**
   * The umask for the process.
   */
  private short umask = 0000 ;

  /**
   * The maximum number of files a process may have open.
   */
  public static int MAX_OPEN_FILES = 0 ;

  /**
   * The array of file descriptors for open files.
   * The integer file descriptors for kernel method calls
   * are indexes into this array. 
   */
  public FileDescriptor[] openFiles = 
    new FileDescriptor[MAX_OPEN_FILES] ;

  /**
   * Construct a process context.  By default, uid=1, gid=1, dir="/root",
   * and umask=0000.
   */
  public ProcessContext()
  {
    super() ;
  }

  /**
   * Construct a process context and specify uid, gid, dir, and umask.
   */
  public ProcessContext( short newUid , short newGid , String newDir , 
    short newUmask )
  {
    super() ;
    uid = newUid ;
    gid = newGid ;
    dir = newDir ;
    umask = newUmask ;
  }

  /**
   * Set the process uid.
   */
  public void setUid( short newUid )
  {
    uid = newUid ;
  }

  /**
   * Get the process uid.
   */
  public short getUid()
  {
    return uid ;
  }

  /**
   * Set the process gid.
   */
  public void setGid( short newGid )
  {
    gid = newGid ;
  }

  /**
   * Get the process gid.
   */
  public short getGid()
  {
    return gid ;
  }

  /**
   * Set the process working directory.
   */
  public void setDir( String newDir )
  {
    dir = newDir ;
  }

  /**
   * Get the process working directory.
   */
  public String getDir()
  {
    return dir ;
  }

  /**
   * Set the process umask.
   */
  public void setUmask( short newUmask )
  {
    umask = newUmask ;
  }

  /**
   * Get the process umask.
   */
  public short getUmask()
  {
    return umask ;
  }

  // ??? toString()

}