127 lines
4.3 KiB
C
127 lines
4.3 KiB
C
/************************************************************
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* fs_opendir.c
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*
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* Copyright (C) 2007 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name Gregory Nutt nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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************************************************************/
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/************************************************************
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* Included Files
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************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <stdlib.h>
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#include <dirent.h>
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#include <errno.h>
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#include <nuttx/fs.h>
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#include "fs_internal.h"
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/************************************************************
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* Private Functions
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************************************************************/
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/************************************************************
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* Public Functions
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************************************************************/
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/************************************************************
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* Name: opendir
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*
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* Description:
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* The opendir() function opens a directory stream
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* corresponding to the directory name, and returns a
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* pointer to the directory stream. The stream is
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* positioned at the first entry in the directory.
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*
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* Inputs:
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* path -- the directory to open
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*
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* Return:
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* The opendir() function returns a pointer to the
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* directory stream. On error, NULL is returned, and
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* errno is set appropriately.
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*
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* EACCES - Permission denied.
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* EMFILE - Too many file descriptors in use by process.
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* ENFILE - Too many files are currently open in the
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* system.
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* ENOENT - Directory does not exist, or name is an empty
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* string.
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* ENOMEM - Insufficient memory to complete the operation.
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* ENOTDIR - 'path' is not a directory.
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*
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************************************************************/
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#if CONFIG_NFILE_DESCRIPTORS > 0
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FAR DIR *opendir(const char *path)
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{
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FAR struct inode *inode;
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FAR struct internal_dir_s *dir;
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/* Get an inode corresponding to the path. On successful
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* return, we will hold on reference count on the inode.
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*/
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inode = inode_finddir(path);
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if (!inode)
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{
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/* 'path' is not a directory.*/
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*get_errno_ptr() = ENOTDIR;
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return NULL;
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}
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/* Allocate a type DIR -- which is little more than an inode
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* container.
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*/
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dir = (FAR struct internal_dir_s *)zalloc(sizeof(struct internal_dir_s));
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if (!dir)
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{
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/* Insufficient memory to complete the operation.*/
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*get_errno_ptr() = ENOMEM;
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inode_release(inode);
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return NULL;
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}
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/* Populate the DIR structure and return it to the caller */
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dir->root = inode; /* Save where we started in case we rewind */
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inode_addref(inode); /* Now we have two references on inode */
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dir->next = inode; /* This is the next node to use for readdir() */
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return ((DIR*)dir);
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}
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#endif /* CONFIG_NFILE_DESCRIPTORS */
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