static int vbg_ioctl_wait_for_events()

in vboxguest/vboxguest_core.c [1187:1232]

• 34 lines of code
• 7 McCabe index (conditional complexity)

static int vbg_ioctl_wait_for_events(struct vbg_dev *gdev,
				     struct vbg_session *session,
				     struct vbg_ioctl_wait_for_events *wait)
{
	u32 timeout_ms = wait->u.in.timeout_ms;
	u32 event_mask = wait->u.in.events;
	unsigned long flags;
	long timeout;
	int ret = 0;

	if (vbg_ioctl_chk(&wait->hdr, sizeof(wait->u.in), sizeof(wait->u.out)))
		return -EINVAL;

	if (timeout_ms == U32_MAX)
		timeout = MAX_SCHEDULE_TIMEOUT;
	else
		timeout = msecs_to_jiffies(timeout_ms);

	wait->u.out.events = 0;
	do {
		timeout = wait_event_interruptible_timeout(
				gdev->event_wq,
				vbg_wait_event_cond(gdev, session, event_mask),
				timeout);

		spin_lock_irqsave(&gdev->event_spinlock, flags);

		if (timeout < 0 || session->cancel_waiters) {
			ret = -EINTR;
		} else if (timeout == 0) {
			ret = -ETIMEDOUT;
		} else {
			wait->u.out.events =
			   vbg_consume_events_locked(gdev, session, event_mask);
		}

		spin_unlock_irqrestore(&gdev->event_spinlock, flags);

		/*
		 * Someone else may have consumed the event(s) first, in
		 * which case we go back to waiting.
		 */
	} while (ret == 0 && wait->u.out.events == 0);

	return ret;
}