+ ret = lttng_ust_ctl_get_next_subbuf(stream->ustream);
+ switch (ret) {
+ case 0:
+ status = GET_NEXT_SUBBUFFER_STATUS_OK;
+ break;
+ case -ENODATA:
+ case -EAGAIN:
+ /*
+ * The caller only expects -ENODATA when there is no data to
+ * read, but the kernel tracer returns -EAGAIN when there is
+ * currently no data for a non-finalized stream, and -ENODATA
+ * when there is no data for a finalized stream. Those can be
+ * combined into a -ENODATA return value.
+ */
+ status = GET_NEXT_SUBBUFFER_STATUS_NO_DATA;
+ goto end;
+ default:
+ status = GET_NEXT_SUBBUFFER_STATUS_ERROR;