Esempi in C++ (Cpp) per input_event_to_user

Esempio n. 1

File: uinput.c Progetto: ricardoanguiano/linux-xlnx

static ssize_t uinput_events_to_user(struct uinput_device *udev,
                                     char __user *buffer, size_t count)
{
    struct input_event event;
    size_t read = 0;

    while (read + input_event_size() <= count &&
            uinput_fetch_next_event(udev, &event)) {

        if (input_event_to_user(buffer + read, &event))
            return -EFAULT;

        read += input_event_size();
    }

    return read;
}

Esempio n. 2

File: uinput.c Progetto: kvaneesh/linux-kvm

static ssize_t uinput_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
{
	struct uinput_device *udev = file->private_data;
	int retval = 0;

	if (udev->state != UIST_CREATED)
		return -ENODEV;

	if (udev->head == udev->tail && (file->f_flags & O_NONBLOCK))
		return -EAGAIN;

	retval = wait_event_interruptible(udev->waitq,
			udev->head != udev->tail || udev->state != UIST_CREATED);
	if (retval)
		return retval;

	retval = mutex_lock_interruptible(&udev->mutex);
	if (retval)
		return retval;

	if (udev->state != UIST_CREATED) {
		retval = -ENODEV;
		goto out;
	}

	while (udev->head != udev->tail && retval + input_event_size() <= count) {
		if (input_event_to_user(buffer + retval, &udev->buff[udev->tail])) {
			retval = -EFAULT;
			goto out;
		}
		udev->tail = (udev->tail + 1) % UINPUT_BUFFER_SIZE;
		retval += input_event_size();
	}

 out:
	mutex_unlock(&udev->mutex);

	return retval;
}