X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=src%2Fcommon%2Fust-consumer%2Fust-consumer.c;h=4d3671a34bbcbe027ae9520f44aca94a51b92af0;hb=4e9a468645939ea62541fa802893b928b01888b7;hp=dea92ac2374f3f5127dc97389ed6f054d8f49d69;hpb=3cc2f24a5cdabfbcb1022c0798f6b4845f72b498;p=lttng-tools.git

diff --git a/src/common/ust-consumer/ust-consumer.c b/src/common/ust-consumer/ust-consumer.c
index dea92ac23..4d3671a34 100644
--- a/src/common/ust-consumer/ust-consumer.c
+++ b/src/common/ust-consumer/ust-consumer.c
@@ -205,6 +205,7 @@ int lttng_ustconsumer_recv_cmd(struct lttng_consumer_local_data *ctx,
 				msg.u.stream.gid,
 				msg.u.stream.net_index,
 				msg.u.stream.metadata_flag,
+				msg.u.stream.session_id,
 				&alloc_ret);
 		if (new_stream == NULL) {
 			switch (alloc_ret) {
@@ -309,6 +310,22 @@ int lttng_ustconsumer_recv_cmd(struct lttng_consumer_local_data *ctx,
 		rcu_read_unlock();
 		return -ENOSYS;
 	}
+	case LTTNG_CONSUMER_DATA_AVAILABLE:
+	{
+		int32_t ret;
+		uint64_t id = msg.u.data_available.session_id;
+
+		DBG("UST consumer data available command for id %" PRIu64, id);
+
+		ret = consumer_data_available(id);
+
+		/* Send back returned value to session daemon */
+		ret = lttcomm_send_unix_sock(sock, &ret, sizeof(ret));
+		if (ret < 0) {
+			PERROR("send data available ret code");
+		}
+		break;
+	}
 	default:
 		break;
 	}
@@ -506,3 +523,34 @@ int lttng_ustconsumer_on_recv_stream(struct lttng_consumer_stream *stream)
 error:
 	return ret;
 }
+
+/*
+ * Check if data is still being extracted from the buffers for a specific
+ * stream. Consumer data lock MUST be acquired before calling this function
+ * and the stream lock.
+ *
+ * Return 0 if the traced data are still getting read else 1 meaning that the
+ * data is available for trace viewer reading.
+ */
+int lttng_ustconsumer_data_available(struct lttng_consumer_stream *stream)
+{
+	int ret;
+
+	assert(stream);
+
+	DBG("UST consumer checking data availability");
+
+	ret = ustctl_get_next_subbuf(stream->chan->handle, stream->buf);
+	if (ret == 0) {
+		/* There is still data so let's put back this subbuffer. */
+		ret = ustctl_put_subbuf(stream->chan->handle, stream->buf);
+		assert(ret == 0);
+		goto end;
+	}
+
+	/* Data is available to be read for this stream. */
+	ret = 1;
+
+end:
+	return ret;
+}