C++ (Cpp) fcopy_handle_handshake Examples

Example #1

/* Callback when data is received from userspace */
static int fcopy_on_msg(void *msg, int len)
{
	int *val = (int *)msg;

	if (len != sizeof(int))
		return -EINVAL;

	if (fcopy_transaction.state == HVUTIL_DEVICE_INIT)
		return fcopy_handle_handshake(*val);

	if (fcopy_transaction.state != HVUTIL_USERSPACE_REQ)
		return -EINVAL;

	/*
	 * Complete the transaction by forwarding the result
	 * to the host. But first, cancel the timeout.
	 */
	if (cancel_delayed_work_sync(&fcopy_timeout_work)) {
		fcopy_transaction.state = HVUTIL_USERSPACE_RECV;
		fcopy_respond_to_host(*val);
		hv_poll_channel(fcopy_transaction.recv_channel,
				fcopy_poll_wrapper);
	}

	return 0;
}

Example #2

File: hv_fcopy.c Project: ayiyaliing/lis-next

static ssize_t fcopy_write(struct file *file, const char __user *buf,
			size_t count, loff_t *ppos)
{
	int response = 0;

	if (count != sizeof(int))
		return -EINVAL;

	if (copy_from_user(&response, buf, sizeof(int)))
		return -EFAULT;

	if (in_hand_shake) {
		if (fcopy_handle_handshake(response))
			return -EINVAL;
		return sizeof(int);
	}

	/*
	 * Complete the transaction by forwarding the result
	 * to the host. But first, cancel the timeout.
	 */
	if (cancel_delayed_work_sync(&fcopy_work))
		fcopy_respond_to_host(response);

	return sizeof(int);
}