/**
 *  @file
 *
 *  @brief Remove an Existing Link
 *  @ingroup libcsupport
 */

/*
 *  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.rtems.org/license/LICENSE.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <unistd.h>

#include <rtems/libio_.h>

/**
 *  POSIX 1003.1b - 5.5.1 - Remove an existing link
 */
int unlink( const char *path )
{
  int rv = 0;
  rtems_filesystem_eval_path_context_t ctx;
  int eval_flags = RTEMS_FS_REJECT_TERMINAL_DOT;
  rtems_filesystem_location_info_t parentloc;
  int parent_eval_flags = RTEMS_FS_PERMS_WRITE
    | RTEMS_FS_PERMS_EXEC
    | RTEMS_FS_FOLLOW_LINK;
  const rtems_filesystem_location_info_t *currentloc =
    rtems_filesystem_eval_path_start_with_parent(
      &ctx,
      path,
      eval_flags,
      &parentloc,
      parent_eval_flags
    );

  if ( !rtems_filesystem_location_is_instance_root( currentloc ) ) {
    const rtems_filesystem_operations_table *ops = currentloc->mt_entry->ops;

    rv = (*ops->rmnod_h)( &parentloc, currentloc );
  } else {
    rtems_filesystem_eval_path_error( &ctx, EBUSY );
    rv = -1;
  }

  rtems_filesystem_eval_path_cleanup_with_parent( &ctx, &parentloc );

  return rv;
}

#if defined(RTEMS_NEWLIB)

#include <reent.h>

/**
 *  This is the Newlib dependent reentrant version of unlink().
 */
int _unlink_r(
  struct _reent *ptr RTEMS_UNUSED,
  const char    *path
)
{
  return unlink( path );
}
#endif