Generate and export the sequence number

[lttng-ust.git] / liblttng-ust / lttng-ring-buffer-client.h

diff --git a/liblttng-ust/lttng-ring-buffer-client.h b/liblttng-ust/lttng-ring-buffer-client.h
index 536a31a8db7591a8c78b291fbad7f3143485f355..07dc4700afdd842066a03ccd41c460db1f7f949a 100644 (file)
--- a/liblttng-ust/lttng-ring-buffer-client.h
+++ b/liblttng-ust/lttng-ring-buffer-client.h
@@ -53,6 +53,7 @@ struct packet_header {
                uint64_t timestamp_end;         /* Cycle count at subbuffer end */
                uint64_t content_size;          /* Size of data in subbuffer */
                uint64_t packet_size;           /* Subbuffer size (include padding) */
+               uint64_t packet_seq_num;        /* Packet sequence number */
                unsigned long events_discarded; /*
                                                 * Events lost in this subbuffer since
                                                 * the beginning of the trace.
@@ -339,6 +340,7 @@ static void client_buffer_begin(struct lttng_ust_lib_ring_buffer *buf, uint64_t
                                subbuf_idx * chan->backend.subbuf_size,
                                handle);
        struct lttng_channel *lttng_chan = channel_get_private(chan);
+       uint64_t cnt = shmp_index(handle, buf->backend.buf_cnt, subbuf_idx)->seq_cnt;
 
        assert(header);
        if (!header)
@@ -351,6 +353,7 @@ static void client_buffer_begin(struct lttng_ust_lib_ring_buffer *buf, uint64_t
        header->ctx.timestamp_end = 0;
        header->ctx.content_size = ~0ULL; /* for debugging */
        header->ctx.packet_size = ~0ULL;
+       header->ctx.packet_seq_num = chan->backend.num_subbuf * cnt + subbuf_idx;
        header->ctx.events_discarded = 0;
        header->ctx.cpu_id = buf->backend.cpu;
 }
@@ -506,6 +509,17 @@ static int client_current_timestamp(struct lttng_ust_lib_ring_buffer *buf,
        return 0;
 }
 
+static int client_sequence_number(struct lttng_ust_lib_ring_buffer *buf,
+               struct lttng_ust_shm_handle *handle,
+               uint64_t *seq)
+{
+       struct packet_header *header;
+
+       header = client_packet_header(buf, handle);
+       *seq = header->ctx.packet_seq_num;
+       return 0;
+}
+
 static const
 struct lttng_ust_client_lib_ring_buffer_client_cb client_cb = {
        .parent = {
@@ -526,6 +540,7 @@ struct lttng_ust_client_lib_ring_buffer_client_cb client_cb = {
        .packet_size = client_packet_size,
        .stream_id = client_stream_id,
        .current_timestamp = client_current_timestamp,
+       .sequence_number = client_sequence_number,
 };
 
 static const struct lttng_ust_lib_ring_buffer_config client_config = {