Function rt_pipe_open

components/drivers/ipc/pipe.c:426–452

* @brief This function will open the pipe and actually creates the pipe buffer. * * @param device is a pointer to the pipe device descriptor. * * @param oflag is the open method, but it is not used yet. * * @return Return the operation status. * When the return value is RT_EOK, the operation is successful. * When the return value is -RT_EINVAL, it means the d

 *           When the return value is -RT_ENOMEM, it means insufficient memory allocation failed.
 */
rt_err_t rt_pipe_open(rt_device_t device, rt_uint16_t oflag)
{
    rt_pipe_t *pipe = (rt_pipe_t *)device;
    rt_err_t ret = RT_EOK;

    if (device == RT_NULL)
    {
        ret = -RT_EINVAL;
        goto __exit;
    }

    rt_mutex_take(&pipe->lock, RT_WAITING_FOREVER);

    if (pipe->fifo == RT_NULL)
    {
        pipe->fifo = rt_ringbuffer_create(pipe->bufsz);
        if (pipe->fifo == RT_NULL)
        {
            ret = -RT_ENOMEM;
        }
    }

    rt_mutex_release(&pipe->lock);

__exit:
    return ret;
}

/**
 * @brief    This function will close the pipe and release the pipe buffer.