{
if (stream->close_flag && stream->prev_seq == stream->last_net_seq_num) {
+ /*
+ * We are about to close the stream so set the data pending flag to 1
+ * which will make the end data pending command skip the stream which
+ * is now closed and ready. Note that after proceeding to a file close,
+ * the written file is ready for reading.
+ */
+ stream->data_pending_check_done = 1;
return 1;
}
return 0;
while (1) {
DBG("Listener accepting connections");
- nb_fd = LTTNG_POLL_GETNB(&events);
-
restart:
ret = lttng_poll_wait(&events, -1);
if (ret < 0) {
goto error;
}
+ nb_fd = ret;
+
DBG("Relay new connection received");
for (i = 0; i < nb_fd; i++) {
/* Fetch once the poll data */
if (data_buffer_size < data_size) {
/* In case the realloc fails, we can free the memory */
- char *tmp_data_ptr = data_buffer;
- data_buffer = realloc(data_buffer, data_size);
- if (!data_buffer) {
+ char *tmp_data_ptr;
+
+ tmp_data_ptr = realloc(data_buffer, data_size);
+ if (!tmp_data_ptr) {
ERR("Allocating data buffer");
- free(tmp_data_ptr);
+ free(data_buffer);
ret = -1;
goto end;
}
+ data_buffer = tmp_data_ptr;
data_buffer_size = data_size;
}
memset(data_buffer, 0, data_size);
* structure considering that the other side will adapt.
*/
- ret = sscanf(VERSION, "%u.%u", &reply.major, &reply.minor);
+ ret = sscanf(VERSION, "%10u.%10u", &reply.major, &reply.minor);
if (ret < 2) {
ERR("Error in scanning version");
ret = -1;
ret = 1;
}
+ /* Pending check is now done. */
+ stream->data_pending_check_done = 1;
+
end_unlock:
rcu_read_unlock();
return ret;
}
+/*
+ * Initialize a data pending command. This means that a client is about to ask
+ * for data pending for each stream he/she holds. Simply iterate over all
+ * streams of a session and set the data_pending_check_done flag.
+ *
+ * This command returns to the client a LTTNG_OK code.
+ */
+static
+int relay_begin_data_pending(struct lttcomm_relayd_hdr *recv_hdr,
+ struct relay_command *cmd, struct lttng_ht *streams_ht)
+{
+ int ret;
+ struct lttng_ht_iter iter;
+ struct lttcomm_relayd_begin_data_pending msg;
+ struct lttcomm_relayd_generic_reply reply;
+ struct relay_stream *stream;
+ uint64_t session_id;
+
+ assert(recv_hdr);
+ assert(cmd);
+ assert(streams_ht);
+
+ DBG("Init streams for data pending");
+
+ if (!cmd->session || cmd->version_check_done == 0) {
+ ERR("Trying to check for data before version check");
+ ret = -1;
+ goto end_no_session;
+ }
+
+ ret = cmd->sock->ops->recvmsg(cmd->sock, &msg, sizeof(msg), 0);
+ if (ret < sizeof(msg)) {
+ ERR("Relay didn't receive valid begin data_pending struct size: %d",
+ ret);
+ ret = -1;
+ goto end_no_session;
+ }
+
+ session_id = be64toh(msg.session_id);
+
+ /*
+ * Iterate over all streams to set the begin data pending flag. For now, the
+ * streams are indexed by stream handle so we have to iterate over all
+ * streams to find the one associated with the right session_id.
+ */
+ rcu_read_lock();
+ cds_lfht_for_each_entry(streams_ht->ht, &iter.iter, stream, stream_n.node) {
+ if (stream->session->id == session_id) {
+ stream->data_pending_check_done = 0;
+ DBG("Set begin data pending flag to stream %" PRIu64,
+ stream->stream_handle);
+ }
+ }
+ rcu_read_unlock();
+
+ /* All good, send back reply. */
+ reply.ret_code = htobe32(LTTNG_OK);
+
+ ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, sizeof(reply), 0);
+ if (ret < 0) {
+ ERR("Relay begin data pending send reply failed");
+ }
+
+end_no_session:
+ return ret;
+}
+
+/*
+ * End data pending command. This will check, for a given session id, if each
+ * stream associated with it has its data_pending_check_done flag set. If not,
+ * this means that the client lost track of the stream but the data is still
+ * being streamed on our side. In this case, we inform the client that data is
+ * inflight.
+ *
+ * Return to the client if there is data in flight or not with a ret_code.
+ */
+static
+int relay_end_data_pending(struct lttcomm_relayd_hdr *recv_hdr,
+ struct relay_command *cmd, struct lttng_ht *streams_ht)
+{
+ int ret;
+ struct lttng_ht_iter iter;
+ struct lttcomm_relayd_end_data_pending msg;
+ struct lttcomm_relayd_generic_reply reply;
+ struct relay_stream *stream;
+ uint64_t session_id;
+ uint32_t is_data_inflight = 0;
+
+ assert(recv_hdr);
+ assert(cmd);
+ assert(streams_ht);
+
+ DBG("End data pending command");
+
+ if (!cmd->session || cmd->version_check_done == 0) {
+ ERR("Trying to check for data before version check");
+ ret = -1;
+ goto end_no_session;
+ }
+
+ ret = cmd->sock->ops->recvmsg(cmd->sock, &msg, sizeof(msg), 0);
+ if (ret < sizeof(msg)) {
+ ERR("Relay didn't receive valid end data_pending struct size: %d",
+ ret);
+ ret = -1;
+ goto end_no_session;
+ }
+
+ session_id = be64toh(msg.session_id);
+
+ /* Iterate over all streams to see if the begin data pending flag is set. */
+ rcu_read_lock();
+ cds_lfht_for_each_entry(streams_ht->ht, &iter.iter, stream, stream_n.node) {
+ if (stream->session->id == session_id &&
+ !stream->data_pending_check_done) {
+ is_data_inflight = 1;
+ DBG("Data is still in flight for stream %" PRIu64,
+ stream->stream_handle);
+ break;
+ }
+ }
+ rcu_read_unlock();
+
+ /* All good, send back reply. */
+ reply.ret_code = htobe32(is_data_inflight);
+
+ ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, sizeof(reply), 0);
+ if (ret < 0) {
+ ERR("Relay end data pending send reply failed");
+ }
+
+end_no_session:
+ return ret;
+}
+
/*
* relay_process_control: Process the commands received on the control socket
*/
case RELAYD_QUIESCENT_CONTROL:
ret = relay_quiescent_control(recv_hdr, cmd);
break;
+ case RELAYD_BEGIN_DATA_PENDING:
+ ret = relay_begin_data_pending(recv_hdr, cmd, streams_ht);
+ break;
+ case RELAYD_END_DATA_PENDING:
+ ret = relay_end_data_pending(recv_hdr, cmd, streams_ht);
+ break;
case RELAYD_UPDATE_SYNC_INFO:
default:
ERR("Received unknown command (%u)", be32toh(recv_hdr->cmd));
data_size = be32toh(data_hdr.data_size);
if (data_buffer_size < data_size) {
- char *tmp_data_ptr = data_buffer;
- data_buffer = realloc(data_buffer, data_size);
- if (!data_buffer) {
+ char *tmp_data_ptr;
+
+ tmp_data_ptr = realloc(data_buffer, data_size);
+ if (!tmp_data_ptr) {
ERR("Allocating data buffer");
- free(tmp_data_ptr);
+ free(data_buffer);
ret = -1;
goto end_unlock;
}
+ data_buffer = tmp_data_ptr;
data_buffer_size = data_size;
}
memset(data_buffer, 0, data_size);
}
while (1) {
- /* Zeroed the events structure */
- lttng_poll_reset(&events);
-
- nb_fd = LTTNG_POLL_GETNB(&events);
-
/* Infinite blocking call, waiting for transmission */
restart:
DBG3("Relayd worker thread polling...");
goto error;
}
+ nb_fd = ret;
+
for (i = 0; i < nb_fd; i++) {
/* Fetch once the poll data */
revents = LTTNG_POLL_GETEV(&events, i);
/* Parse arguments */
progname = argv[0];
- if ((ret = parse_args(argc, argv) < 0)) {
+ if ((ret = parse_args(argc, argv)) < 0) {
goto exit;
}
projects / lttng-tools.git / blobdiff