Function sys_stat

components/lwp/lwp_syscall.c:4464–4506

* @brief Retrieves information about a file or directory. * * This system call obtains metadata about the specified file or directory and stores it in * the `buf` structure. The metadata includes attributes such as file size, permissions, * ownership, and timestamps. * * @param[in] file A pointer to the path of the file or directory to be queried. * The path should be a

 *          Check all inputs before invoking this function to avoid potential issues.
 */
sysret_t sys_stat(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';

    ret = _SYS_WRAP(stat(copy_path, &statbuff));
    rt_free(copy_path);

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

    return ret;
}

/**
 * @brief Retrieves metadata about a file or symbolic link.