+static enum lttng_error_code lttng_event_rule_kernel_tracepoint_mi_serialize(
+ const struct lttng_event_rule *rule, struct mi_writer *writer)
+{
+ int ret;
+ enum lttng_error_code ret_code;
+ enum lttng_event_rule_status status;
+ const char *filter = NULL;
+ const char *name_pattern = NULL;
+
+ assert(rule);
+ assert(writer);
+ assert(IS_KERNEL_TRACEPOINT_EVENT_RULE(rule));
+
+ status = lttng_event_rule_kernel_tracepoint_get_name_pattern(
+ rule, &name_pattern);
+ assert(status == LTTNG_EVENT_RULE_STATUS_OK);
+ assert(name_pattern);
+
+ status = lttng_event_rule_kernel_tracepoint_get_filter(rule, &filter);
+ assert(status == LTTNG_EVENT_RULE_STATUS_OK ||
+ status == LTTNG_EVENT_RULE_STATUS_UNSET);
+
+ /* Open event rule kernel tracepoint element. */
+ ret = mi_lttng_writer_open_element(
+ writer, mi_lttng_element_event_rule_kernel_tracepoint);
+ if (ret) {
+ goto mi_error;
+ }
+
+ /* Name pattern. */
+ ret = mi_lttng_writer_write_element_string(writer,
+ mi_lttng_element_event_rule_name_pattern, name_pattern);
+ if (ret) {
+ goto mi_error;
+ }
+
+ /* Filter. */
+ if (filter != NULL) {
+ ret = mi_lttng_writer_write_element_string(writer,
+ mi_lttng_element_event_rule_filter_expression,
+ filter);
+ if (ret) {
+ goto mi_error;
+ }
+ }
+
+ /* Close event rule kernel tracepoint element. */
+ ret = mi_lttng_writer_close_element(writer);
+ if (ret) {
+ goto mi_error;
+ }
+
+ ret_code = LTTNG_OK;
+ goto end;
+
+mi_error:
+ ret_code = LTTNG_ERR_MI_IO_FAIL;
+end:
+ return ret_code;
+}
+