Function sys_fstat

components/lwp/lwp_syscall.c:830–863

* @brief Retrieves information about a file associated with a file descriptor. * * This system call retrieves the status information about the file referred to * by the file descriptor `file` and stores it in the structure pointed to by `buf`. * It is typically used to obtain metadata such as file size, permissions, type, * and timestamps. * * @param file The file descriptor referring to an

 * @see sys_open(), sys_close(), stat(), fstat()
 */
sysret_t sys_fstat(int file, struct stat *buf)
{
#ifdef ARCH_MM_MMU
    int ret = -1;
    struct stat statbuff = {0};

    if (!lwp_user_accessable((void *)buf, sizeof(struct stat)))
    {
        return -EFAULT;
    }
    else
    {
        ret = fstat(file, &statbuff);

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

        return ret;
    }
#else
    if (!lwp_user_accessable((void *)buf, sizeof(struct stat)))
    {
        return -EFAULT;
    }
    int ret = fstat(file, buf);
    return (ret < 0 ? GET_ERRNO() : ret);
#endif
}

/**
 * @brief Monitors multiple file descriptors to see if they are ready for I/O.