88 lines
2.9 KiB
C
88 lines
2.9 KiB
C
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/****************************************************************************
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* libs/libc/dirent/lib_opendir.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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 <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <string.h>
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#include "libc.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 corresponding to the
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* directory name, and returns a pointer to the directory stream. The
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* stream is positioned at the first entry in the directory.
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*
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* Input Parameters:
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* path -- the directory to open
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*
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* Returned Value:
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* The opendir() function returns a pointer to the directory stream. On
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* error, NULL is returned, and 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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FAR DIR *opendir(FAR const char *path)
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{
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FAR DIR *dir;
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int fd;
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dir = lib_malloc(sizeof(*dir));
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if (dir == NULL)
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{
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set_errno(ENOMEM);
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return NULL;
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}
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fd = open(path, O_RDONLY | O_DIRECTORY | O_CLOEXEC);
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if (fd < 0)
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{
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lib_free(dir);
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return NULL;
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}
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dir->fd = fd;
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return dir;
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}
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