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/*

 *  link() - POSIX 1003.1b - 5.3.4 - Create a new link

 *

 *  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.

 *

 *  link.c,v 1.11 2002/01/04 18:29:36 joel Exp

 */

#if HAVE_CONFIG_H

#include "config.h"

#endif

#include <rtems.h>

#include <rtems/libio.h>

#include <errno.h>

#include <rtems/libio_.h>

#include <rtems/seterr.h>

int link(

  const char *existing,

  const char *new

)

{

  rtems_filesystem_location_info_t    existing_loc;

  rtems_filesystem_location_info_t    parent_loc;

  int                                 i;

  int                                 result;

  const char                         *name_start;

  /*

   * Get the node we are linking to.

   */

  result = rtems_filesystem_evaluate_path( existing, 0, &existing_loc, TRUE );

  if ( result != 0 )

     return -1;

  /*

   * Get the parent of the node we are creating.

   */

  rtems_filesystem_get_start_loc( new, &i, &parent_loc );

  if ( !parent_loc.ops->evalformake_h ) {

    rtems_filesystem_freenode( &existing_loc );

    rtems_set_errno_and_return_minus_one( ENOTSUP );

  }

  result = (*parent_loc.ops->evalformake_h)( &new[i], &parent_loc, &name_start );

  if ( result != 0 ) {

    rtems_filesystem_freenode( &existing_loc );

    rtems_set_errno_and_return_minus_one( result );

  }

  /*

   *  Check to see if the caller is trying to link across file system

   *  boundaries.

   */

  if ( parent_loc.mt_entry != existing_loc.mt_entry ) {

    rtems_filesystem_freenode( &existing_loc );

    rtems_filesystem_freenode( &parent_loc );

    rtems_set_errno_and_return_minus_one( EXDEV );

  }

  if ( !parent_loc.ops->link_h ) {

    rtems_filesystem_freenode( &existing_loc );

    rtems_filesystem_freenode( &parent_loc );

    rtems_set_errno_and_return_minus_one( ENOTSUP );

  }

  result = (*parent_loc.ops->link_h)( &existing_loc, &parent_loc, name_start );

  rtems_filesystem_freenode( &existing_loc );

  rtems_filesystem_freenode( &parent_loc );

  return result;

}

/*

 *  _link_r

 *

 *  This is the Newlib dependent reentrant version of link().

 */

#if defined(RTEMS_NEWLIB)

#include <reent.h>

int _link_r(

  struct _reent *ptr,

  const char    *existing,

  const char    *new

)

{

  return link( existing, new );

}

#endif