else { // underrun
self->d_nunderuns++;
- ::write(2, "aU", 2); // FIXME change to non-blocking call
+ ssize_t r = ::write(2, "aU", 2); // FIXME change to non-blocking call
+ if(r == -1) {
+ perror("audio_portaudio_source::portaudio_source_callback write error to stderr.");
+ }
// FIXME we should transfer what we've got and pad the rest
memset(outputBuffer, 0, nreqd_samples * sizeof(sample_t));