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 );
}