+ /*
+ * Enums are captured as a map containing 2 key-value pairs. Such as:
+ * - type: enum
+ * value: 177
+ */
+ ret = lttng_msgpack_begin_map(writer, 2);
+ if (ret) {
+ WARN_ON_ONCE(1);
+ goto end;
+ }
+
+ ret = lttng_msgpack_write_str(writer, "type");
+ if (ret) {
+ WARN_ON_ONCE(1);
+ goto end;
+ }
+
+ ret = lttng_msgpack_write_str(writer, "enum");
+ if (ret) {
+ WARN_ON_ONCE(1);
+ goto end;
+ }
+
+ ret = lttng_msgpack_write_str(writer, "value");
+ if (ret) {
+ WARN_ON_ONCE(1);
+ goto end;
+ }
+
+ switch (output->type) {
+ case LTTNG_INTERPRETER_TYPE_SIGNED_ENUM:
+ ret = lttng_msgpack_write_signed_integer(writer, output->u.s);
+ if (ret) {
+ WARN_ON_ONCE(1);
+ goto end;
+ }
+ break;
+ case LTTNG_INTERPRETER_TYPE_UNSIGNED_ENUM:
+ ret = lttng_msgpack_write_signed_integer(writer, output->u.u);
+ if (ret) {
+ WARN_ON_ONCE(1);
+ goto end;
+ }
+ break;
+ default:
+ WARN_ON(1);
+ }
+
+ ret = lttng_msgpack_end_map(writer);
+ if (ret)
+ WARN_ON_ONCE(1);
+
+end:
+ return ret;
+}
+
+static
+int64_t capture_sequence_element_signed(uint8_t *ptr,
+ const struct lttng_kernel_type_integer *type)
+{
+ int64_t value = 0;
+ unsigned int size = type->size;
+ bool byte_order_reversed = type->reverse_byte_order;
+
+ switch (size) {
+ case 8:
+ value = *ptr;
+ break;
+ case 16:
+ {
+ int16_t tmp;
+ tmp = *(int16_t *) ptr;
+ if (byte_order_reversed)
+ __swab16s(&tmp);
+
+ value = tmp;
+ break;
+ }
+ case 32:
+ {
+ int32_t tmp;
+ tmp = *(int32_t *) ptr;
+ if (byte_order_reversed)
+ __swab32s(&tmp);
+
+ value = tmp;
+ break;
+ }
+ case 64:
+ {
+ int64_t tmp;
+ tmp = *(int64_t *) ptr;
+ if (byte_order_reversed)
+ __swab64s(&tmp);
+
+ value = tmp;
+ break;
+ }
+ default:
+ WARN_ON(1);
+ }
+
+ return value;
+}
+
+static
+uint64_t capture_sequence_element_unsigned(uint8_t *ptr,
+ const struct lttng_kernel_type_integer *type)
+{
+ uint64_t value = 0;
+ unsigned int size = type->size;
+ bool byte_order_reversed = type->reverse_byte_order;
+
+ switch (size) {
+ case 8:
+ value = *ptr;
+ break;
+ case 16:
+ {
+ uint16_t tmp;
+ tmp = *(uint16_t *) ptr;
+ if (byte_order_reversed)
+ __swab16s(&tmp);
+
+ value = tmp;
+ break;
+ }
+ case 32:
+ {
+ uint32_t tmp;
+ tmp = *(uint32_t *) ptr;
+ if (byte_order_reversed)
+ __swab32s(&tmp);
+
+ value = tmp;
+ break;
+ }
+ case 64:
+ {
+ uint64_t tmp;
+ tmp = *(uint64_t *) ptr;
+ if (byte_order_reversed)
+ __swab64s(&tmp);
+
+ value = tmp;
+ break;
+ }
+ default:
+ WARN_ON(1);
+ }
+
+ return value;
+}
+
+int capture_sequence(struct lttng_msgpack_writer *writer,
+ struct lttng_interpreter_output *output)
+{
+ const struct lttng_kernel_type_integer *integer_type = NULL;
+ const struct lttng_kernel_type_common *nested_type;
+ uint8_t *ptr;
+ bool signedness;
+ int ret, i;
+
+ ret = lttng_msgpack_begin_array(writer, output->u.sequence.nr_elem);
+ if (ret) {
+ WARN_ON_ONCE(1);
+ goto end;
+ }
+
+ ptr = (uint8_t *) output->u.sequence.ptr;
+ nested_type = output->u.sequence.nested_type;
+ switch (nested_type->type) {
+ case lttng_kernel_type_integer:
+ integer_type = lttng_kernel_get_type_integer(nested_type);
+ break;
+ case lttng_kernel_type_enum:
+ /* Treat enumeration as an integer. */
+ integer_type = lttng_kernel_get_type_integer(lttng_kernel_get_type_enum(nested_type)->container_type);
+ break;
+ default:
+ /* Capture of array of non-integer are not supported. */
+ WARN_ON(1);
+ }
+ signedness = integer_type->signedness;
+ for (i = 0; i < output->u.sequence.nr_elem; i++) {
+ if (signedness) {
+ ret = lttng_msgpack_write_signed_integer(writer,
+ capture_sequence_element_signed(ptr, integer_type));
+ if (ret) {
+ WARN_ON_ONCE(1);
+ goto end;
+ }
+ } else {
+ ret = lttng_msgpack_write_unsigned_integer(writer,
+ capture_sequence_element_unsigned(ptr, integer_type));
+ if (ret) {
+ WARN_ON_ONCE(1);
+ goto end;
+ }
+ }
+
+ /*
+ * We assume that alignment is smaller or equal to the size.
+ * This currently holds true but if it changes in the future,
+ * we will want to change the pointer arithmetics below to
+ * take into account that the next element might be further
+ * away.
+ */
+ WARN_ON(integer_type->alignment > integer_type->size);
+
+ /* Size is in number of bits. */
+ ptr += (integer_type->size / CHAR_BIT) ;
+ }
+
+ ret = lttng_msgpack_end_array(writer);
+ if (ret)
+ WARN_ON_ONCE(1);
+end:
+ return ret;
+}
+
+static
+int notification_append_capture(
+ struct lttng_event_notifier_notification *notif,
+ struct lttng_interpreter_output *output)
+{
+ struct lttng_msgpack_writer *writer = ¬if->writer;
+ int ret = 0;
+
+ switch (output->type) {
+ case LTTNG_INTERPRETER_TYPE_S64:
+ ret = lttng_msgpack_write_signed_integer(writer, output->u.s);
+ if (ret) {
+ WARN_ON_ONCE(1);
+ goto end;
+ }
+ break;
+ case LTTNG_INTERPRETER_TYPE_U64:
+ ret = lttng_msgpack_write_unsigned_integer(writer, output->u.u);
+ if (ret) {
+ WARN_ON_ONCE(1);
+ goto end;
+ }
+ break;
+ case LTTNG_INTERPRETER_TYPE_STRING:
+ ret = lttng_msgpack_write_str(writer, output->u.str.str);
+ if (ret) {
+ WARN_ON_ONCE(1);
+ goto end;
+ }
+ break;
+ case LTTNG_INTERPRETER_TYPE_SEQUENCE:
+ ret = capture_sequence(writer, output);
+ if (ret) {
+ WARN_ON_ONCE(1);
+ goto end;
+ }
+ break;
+ case LTTNG_INTERPRETER_TYPE_SIGNED_ENUM:
+ case LTTNG_INTERPRETER_TYPE_UNSIGNED_ENUM:
+ ret = capture_enum(writer, output);
+ if (ret) {
+ WARN_ON_ONCE(1);
+ goto end;
+ }
+ break;
+ default:
+ ret = -1;
+ WARN_ON(1);
+ }
+end:
+ return ret;
+}
+
+static
+int notification_append_empty_capture(
+ struct lttng_event_notifier_notification *notif)
+{
+ int ret = lttng_msgpack_write_nil(¬if->writer);
+ if (ret)
+ WARN_ON_ONCE(1);
+
+ return ret;
+}
+
+static
+int notification_init(struct lttng_event_notifier_notification *notif,
+ struct lttng_kernel_event_notifier *event_notifier)
+{
+ struct lttng_msgpack_writer *writer = ¬if->writer;
+ int ret = 0;
+
+ notif->has_captures = false;
+
+ if (event_notifier->priv->num_captures > 0) {
+ lttng_msgpack_writer_init(writer, notif->capture_buf,
+ CAPTURE_BUFFER_SIZE);
+
+ ret = lttng_msgpack_begin_array(writer, event_notifier->priv->num_captures);
+ if (ret) {
+ WARN_ON_ONCE(1);
+ goto end;
+ }
+
+ notif->has_captures = true;
+ }
+
+end:
+ return ret;
+}
+
+static
+void record_error(struct lttng_kernel_event_notifier *event_notifier)
+{
+
+ struct lttng_event_notifier_group *event_notifier_group = event_notifier->priv->group;
+ struct lttng_counter *error_counter;
+ size_t dimension_index[1];
+ int ret;
+
+ /*
+ * lttng_smp_load_acquire paired with lttng_smp_store_release orders
+ * creation of the error counter and setting error_counter_len
+ * before the error_counter is used.
+ */
+ error_counter = lttng_smp_load_acquire(&event_notifier_group->error_counter);
+ /* This group may not have an error counter attached to it. */
+ if (!error_counter)