128 lines
3.6 KiB
C
128 lines
3.6 KiB
C
/****************************************************************************
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* libs/libc/unistd/lib_chdir.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 <nuttx/config.h>
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#include <sys/stat.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <errno.h>
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#include "libc.h"
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#ifndef CONFIG_DISABLE_ENVIRON
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: chdir
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*
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* Description:
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* The chdir() function causes the directory named by the pathname pointed
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* to by the 'path' argument to become the current working directory; that
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* is, the starting point for path searches for pathnames not beginning
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* with '/'.
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*
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* Input Parameters:
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* path - A pointer to a directory to use as the new current working
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* directory
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*
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* Returned Value:
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* 0(OK) on success; -1(ERROR) on failure with errno set appropriately:
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*
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* EACCES
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* Search permission is denied for any component of the pathname.
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* ELOOP
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* A loop exists in symbolic links encountered during resolution of the
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* 'path' argument OR more that SYMLOOP_MAX symbolic links in the
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* resolution of the 'path' argument.
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* ENAMETOOLONG
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* The length of the path argument exceeds PATH_MAX or a pathname
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* component is longer than NAME_MAX.
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* ENOENT
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* A component of 'path' does not name an existing directory or path is
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* an empty string.
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* ENOTDIR
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* A component of the pathname is not a directory.
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*
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****************************************************************************/
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int chdir(FAR const char *path)
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{
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struct stat buf;
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FAR char *oldpwd;
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FAR char *abspath;
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int ret;
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/* Verify that 'path' refers to a directory */
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ret = stat(path, &buf);
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if (ret < 0)
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{
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return ret;
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}
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/* Something exists here... is it a directory? */
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if (!S_ISDIR(buf.st_mode))
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{
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set_errno(ENOTDIR);
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return ERROR;
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}
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/* Yes, it is a directory.
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* Remove any trailing '/' characters from the path
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*/
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abspath = realpath(path, NULL);
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if (abspath == NULL)
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{
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return ERROR;
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}
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/* Replace any preceding OLDPWD with the current PWD (this is to
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* support 'cd -' in NSH)
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*/
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sched_lock();
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oldpwd = getenv("PWD");
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if (!oldpwd)
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{
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oldpwd = CONFIG_LIBC_HOMEDIR;
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}
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setenv("OLDPWD", oldpwd, TRUE);
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/* Set the cwd to the input 'path' */
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ret = setenv("PWD", abspath, TRUE);
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lib_free(abspath);
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sched_unlock();
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return ret;
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}
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#endif /* !CONFIG_DISABLE_ENVIRON */
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