When we send an empty index (beacon), we need to extract the stream_id
to avoid stalling the client on inactive streams on startup.

This patch should also be backported to 2.4.x.

Signed-off-by: Julien Desfossez <[email protected]>
---
 src/common/consumer-timer.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/common/consumer-timer.c b/src/common/consumer-timer.c
index c659bf6..c13577f 100644
--- a/src/common/consumer-timer.c
+++ b/src/common/consumer-timer.c
@@ -118,8 +118,16 @@ static int send_empty_index(struct lttng_consumer_stream 
*stream, uint64_t ts)
 {
        int ret;
        struct ctf_packet_index index;
+       uint64_t stream_id;
+
+       ret = kernctl_get_stream_id(stream->wait_fd, &stream_id);
+       if (ret < 0) {
+               PERROR("kernctl_get_stream_id");
+               goto error;
+       }
 
        memset(&index, 0, sizeof(index));
+       index.stream_id = htobe64(stream_id);
        index.timestamp_end = htobe64(ts);
        ret = consumer_stream_write_index(stream, &index);
        if (ret < 0) {
-- 
1.9.1


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