/*! \details This function opens a directory.
*
* \return a pointer to the directory or NULL with errno (see \ref ERRNO) set to:
* - ENOMEM: not enough memory
* - ENOENT: \a dirname was not found
* - EACCES: read access to \a dirname is not allowed
* - ENAMETOOLONG: \a dirname exceeds \a PATH_MAX or an element of \a dirname exceeds \a NAME_MAX
*
*/
DIR * opendir(const char * dirname){
int err;
DIR * dirp;
const sysfs_t * fs;
if ( sysfs_ispathinvalid(dirname) == true ){
return NULL;
}
fs = sysfs_find(dirname, false); //see which filesystem we are working with first
if ( fs == NULL ){ //if no filesystem is found for the path, return no entity
errno = ENOENT;
return NULL;
}
dirp = malloc(sizeof(DIR));
if ( dirp == NULL ){
errno = ENOMEM;
return NULL;
}
//Open the directory and check for errors
err = fs->opendir(fs->cfg, &(dirp->handle), sysfs_stripmountpath(fs, dirname));
if ( err < 0 ){
free(dirp);
return NULL;
}
//Initialize the DIR structure
dirp->fs = fs;
dirp->loc = 0;
//Return the pointer to the table
return dirp;
}
int rootfs_stat(const void * cfg, const char * path, struct stat * st){
char buffer[PATH_MAX];
const sysfs_t * fs;
int is_root = 0;
if( path[0] == 0 ){
is_root = 1;
}
strcpy(buffer, "/");
strcat(buffer, path);
//find the mount point of the path
fs = sysfs_find(buffer, false);
if ( fs == NULL ){
errno = ENOENT;
return -1;
}
//If the fs is not root, but the mount path says root then the path doesn't exist
if( (is_root == 0) ){
if( (fs->mount_path[1] == 0) ){
errno = ENOENT;
return -1;
}
}
st->st_mode = S_IFDIR | fs->access;
return 0;
}
int lstat(const char * path, struct stat *buf){
const sysfs_t * fs;
if ( sysfs_ispathinvalid(path) == true ){
return -1;
}
fs = sysfs_find(path, true);
if ( fs != NULL ){
return fs->lstat(fs->cfg, sysfs_stripmountpath(fs, path), buf);
}
errno = ENOENT;
return -1;
}
/*! \cond */
int _stat(const char * path, struct stat *buf){
const sysfs_t * fs;
if ( sysfs_ispathinvalid(path) == true ){
return -1;
}
fs = sysfs_find(path, true);
if ( fs != NULL ){
int ret = fs->stat(fs->config, sysfs_stripmountpath(fs, path), buf);
SYSFS_PROCESS_RETURN(ret);
return ret;
}
errno = ENOENT;
return -1;
}