Function sys_channel_send

components/lwp/lwp_syscall.c:4145–4170

* @brief Sends a message through a communication channel. * * This system call is used to send a message through a specified communication channel identified * by the file descriptor `fd`. The message to be sent is provided in the `data` parameter. * It allows inter-process or inter-thread communication by transmitting the given message over * the open channel. * * @param[in] fd The fil

 *          to errors, data loss, or undefined behavior.
 */
sysret_t sys_channel_send(int fd, rt_channel_msg_t data)
{
    rt_size_t ret = 0;
    rt_channel_msg_t kdata = RT_NULL;

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

    kdata = kmem_get(sizeof(*data));
    if (kdata == RT_NULL)
        return -ENOMEM;

    if (lwp_get_from_user(kdata, data, sizeof(*kdata)) != sizeof(*kdata))
    {
        kmem_put(kdata);
        return -EFAULT;
    }

    ret = lwp_channel_send(FDT_TYPE_LWP, fd, kdata);

    kmem_put(kdata);

    return ret;
}

/**
 * @brief Sends a message through a communication channel and waits for a response with a timeout.