[LAD] Alsa: poll mixer events, always returns true in subsequent calls

Hello, I'm trying to poll mixer events in Alsa using C. I've used the following functions within an infinite while loop: if (snd_hctl_wait(hctl,-1)) { ... } ###### and snd_hctl_poll_descriptors(hctl, poll_fds, 1); err = poll (poll_fds, 1, -1); if (poll_fds[0].revents & POLLIN) { ... } While I can get the first mixer event fine, in all subsequent rounds, both snd_hctl_wait and poll always return immediately. With the snd_mixer functions one has to call snd_mixer_handle_events to clear events. However, calling snd_hctl_handle_events here never returns and I can't quite figure out why. Nonetheless, I'm not even sure that's the key to my solution. Can anyone give me some advice on how to get this working? Kind regards, Maarten