Subversion Repositories openrisc_2011-10-31

/*

 *  dup2() - POSIX 1003.1b 6.2.1 Duplicate an Open File Descriptor

 *

 *  COPYRIGHT (c) 1989-1999.

 *  On-Line Applications Research Corporation (OAR).

 *

 *  The license and distribution terms for this file may be

 *  found in the file LICENSE in this distribution or at

 *  http://www.OARcorp.com/rtems/license.html.

 *

 *  $Id: dup2.c,v 1.2 2001-09-27 12:01:15 chris Exp $

 */

#include <unistd.h>

#include <fcntl.h>

#include "libio_.h"

int dup2(

  int fildes,

  int fildes2

)

{

  int          status;

  struct stat  buf;

  /*

   *  If fildes is not valid, then fildes2 should not be closed.

   */

  status = fstat( fildes, &buf );

  if ( status == -1 )

    return -1;

  /*

   *  If fildes2 is not valid, then we should not do anything either.

   */

  status = fstat( fildes2, &buf );

  if ( status == -1 )

    return -1;

  /*

   *  This fcntl handles everything else.

   */

  return fcntl( fildes, F_DUPFD, fildes2 );

}