text: /****************************************************************************
   * fs/fs_closedir.c
   *
   *   Copyright (C) 2007-2009, 2011, 2013-2014 Gregory Nutt. All rights reserved.
   *   Author: Gregory Nutt <gnutt@nuttx.org>
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   * 3. Neither the name NuttX nor the names of its contributors may be
   *    used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
   * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
   * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
   * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
   * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
   * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
   * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
   * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   * POSSIBILITY OF SUCH DAMAGE.
   *
   ****************************************************************************/
  
  /****************************************************************************
   * Included Files
   ****************************************************************************/
  
  #include <nuttx/config.h>
  
  #include <dirent.h>
  #include <errno.h>
  
  #include <nuttx/kmalloc.h>
  #include <nuttx/fs/fs.h>
  #include <nuttx/fs/dirent.h>
  
  #include "fs_internal.h"
  
  /****************************************************************************
   * Private Functions
   ****************************************************************************/
  
  /****************************************************************************
   * Public Functions
   ****************************************************************************/
  
  /****************************************************************************
   * Name: closedir
   *
   * Description:
   *    The closedir() function closes the directory stream associated with
   *    'dirp'.  The directory stream descriptor 'dirp' is not available after
   *    this call.
   *
   * Inputs:
   *   dirp -- An instance of type DIR created by a previous call to opendir();
   *
   * Return:
   *   The closedir() function returns 0 on success.  On error, -1 is
   *   returned, and errno is set appropriately.
   *
   ****************************************************************************/
  
  int closedir(FAR DIR *dirp)
  {
    struct fs_dirent_s *idir = (struct fs_dirent_s *)dirp;
  #ifndef CONFIG_DISABLE_MOUNTPOINT
    struct inode *inode;
  #endif
    int ret;
  
    /* Verify that we were provided with a valid directory structure */
  
    if (!idir)
      {
        ret = EBADF;
        goto errout;
      }
  
    /* A special case is when we enumerate an "empty", unused inode.  That is
     * an inode in the pseudo-filesystem that has no operations and no children.
     * This is a "dangling" directory entry that has lost its childre.
     */
  
    if (idir->fd_root)
      {
        /* This is the 'root' inode of the directory.  This means different
         * things wih different filesystems.
         */
  
  #ifndef CONFIG_DISABLE_MOUNTPOINT
        inode = idir->fd_root;
  
        /* The way that we handle the close operation depends on what kind of
         * root inode we have open.
         */
  
        if (INODE_IS_MOUNTPT(inode) && !DIRENT_ISPSEUDONODE(idir->fd_flags))
          {
            /* The node is a file system mointpoint. Verify that the
             * mountpoint supports the closedir() method (not an error if it
             * does not)
             */
  
            if (inode->u.i_mops && inode->u.i_mops->closedir)
              {
                /* Perform the closedir() operation */
  
                ret = inode->u.i_mops->closedir(inode, idir);
                if (ret < 0)
                  {
                    ret = -ret;
                    goto errout_with_inode;
                  }
              }
          }
        else
  #endif
          {
            /* The node is part of the root pseudo file system, release
             * our contained reference to the 'next' inode.
             */
  
            if (idir->u.pseudo.fd_next)
              {
                inode_release(idir->u.pseudo.fd_next);
              }
          }
  
        /* Release our references on the contained 'root' inode */
  
        inode_release(idir->fd_root);
      }
  
    /* Then release the container */
  
    kumm_free(idir);
    return OK;
  
  #ifndef CONFIG_DISABLE_MOUNTPOINT
  errout_with_inode:
    inode_release(inode);
    kumm_free(idir);
  #endif
  
  errout:
    set_errno(ret);
    return ERROR;
  }
  