Function sys_mb_recv

components/lwp/lwp_syscall.c:2482–2507

* @brief Receives a message from a mailbox with a timeout. * * This system call attempts to receive a message from the specified mailbox. * If the mailbox is empty, the function will wait for a specified timeout * period for a message to arrive. If no message is received within the timeout, * an error is returned. * * @param[in] mb The handle to the mailbox object from which the mess

 *          indefinite blocking, potentially resulting in deadlocks.
 */
sysret_t sys_mb_recv(rt_mailbox_t mb, rt_ubase_t *value, rt_int32_t timeout)
{
    int ret = 0;
    rt_ubase_t *kvalue;

    if (!lwp_user_accessable((void *)value, sizeof(rt_ubase_t *)))
    {
        return -EFAULT;
    }

    kvalue = kmem_get(sizeof(rt_ubase_t *));
    if (kvalue == RT_NULL)
    {
        return -ENOMEM;
    }

    ret = rt_mb_recv(mb, (rt_ubase_t *)kvalue, timeout);
    if (ret == RT_EOK)
    {
        lwp_put_to_user(value, kvalue, sizeof(rt_ubase_t *));
    }

    kmem_put(kvalue);

    return ret;
}

rt_weak int syslog_ctrl(int type, char *buf, int len)
{