Function dfs_file_lseek

components/dfs/dfs_v2/src/dfs_file.c:1214–1235

* @brief Change the file position indicator * * This function sets the file position indicator for the file referenced by the file descriptor * based on the offset and whence parameters. * * @param[in,out] file Pointer to the file structure (position will be modified) * @param[in] offset Number of bytes to offset from position * @param[in] whence Reference position (SEEK_SET/SEEK_CUR/SEEK_E

 *         -EINVAL if invalid parameters or not mounted
 */
off_t dfs_file_lseek(struct dfs_file *file, off_t offset, int wherece)
{
    off_t retval = -EINVAL;

    if (file && file->fops->lseek)
    {
        if (dfs_is_mounted(file->vnode->mnt) == 0)
        {
            /* fpos lock */
            off_t pos = dfs_file_get_fpos(file);
            retval = file->fops->lseek(file, offset, wherece);
            if (retval >= 0)
            {
                pos = retval;
            }
            /* fpos unlock */
            dfs_file_set_fpos(file, pos);
        }
    }

    return retval;
}

/**
 * @brief Get file status information