Function sys_lstat

components/lwp/lwp_syscall.c:4533–4578

* @brief Retrieves metadata about a file or symbolic link. * * This system call obtains metadata for the specified file or symbolic link and stores * it in the `buf` structure. Unlike `sys_stat`, if the specified path refers to a * symbolic link, this function retrieves information about the link itself, not the * target it points to. * * @param[in] file A pointer to the path of the file

 *          Always check inputs for validity before invoking this function.
 */
sysret_t sys_lstat(const char *file, struct stat *buf)
{
    int ret = 0;
    size_t len;
    size_t copy_len;
    char *copy_path;
    struct stat statbuff = {0};

    if (!lwp_user_accessable((void *)buf, sizeof(struct stat)))
    {
        return -EFAULT;
    }

    len = lwp_user_strlen(file);
    if (len <= 0)
    {
        return -EFAULT;
    }

    copy_path = (char*)rt_malloc(len + 1);
    if (!copy_path)
    {
        return -ENOMEM;
    }

    copy_len = lwp_get_from_user(copy_path, (void*)file, len);
    if (copy_len == 0)
    {
        rt_free(copy_path);
        return -EFAULT;
    }
    copy_path[copy_len] = '\0';
#ifdef RT_USING_DFS_V2
    ret = _SYS_WRAP(dfs_file_lstat(copy_path, &statbuff));
#else
    ret = _SYS_WRAP(stat(copy_path, &statbuff));
#endif
    rt_free(copy_path);

    if (ret == 0)
    {
        lwp_put_to_user(buf, &statbuff, sizeof statbuff);
    }

    return ret;
}

sysret_t sys_notimpl(void)
{