+static ssize_t lttng_event_context_app_populate_from_payload(const struct lttng_payload_view *view,
+ struct lttng_event_context *event_ctx)
+{
+ ssize_t ret, offset = 0;
+ const struct lttng_event_context_app_comm *comm;
+ char *provider_name = nullptr, *context_name = nullptr;
+ size_t provider_name_len, context_name_len;
+ const struct lttng_buffer_view comm_view =
+ lttng_buffer_view_from_view(&view->buffer, offset, sizeof(*comm));
+
+ assert(event_ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT);
+
+ if (!lttng_buffer_view_is_valid(&comm_view)) {
+ ret = -1;
+ goto end;
+ }
+
+ comm = (typeof(comm)) comm_view.data;
+ offset += sizeof(*comm);
+
+ provider_name_len = comm->provider_name_len;
+ context_name_len = comm->ctx_name_len;
+
+ if (provider_name_len == 0 || context_name_len == 0) {
+ /*
+ * Application provider and context names MUST
+ * be provided.
+ */
+ ret = -1;
+ goto end;
+ }
+
+ {
+ const char *name;
+ const struct lttng_buffer_view provider_name_view =
+ lttng_buffer_view_from_view(&view->buffer, offset, provider_name_len);
+
+ if (!lttng_buffer_view_is_valid(&provider_name_view)) {
+ ret = -1;
+ goto end;
+ }
+
+ name = provider_name_view.data;
+
+ if (!lttng_buffer_view_contains_string(
+ &provider_name_view, name, provider_name_len)) {
+ ret = -1;
+ goto end;
+ }
+
+ provider_name = lttng_strndup(name, provider_name_len);
+ if (!provider_name) {
+ ret = -1;
+ goto end;
+ }
+
+ offset += provider_name_len;
+ }
+
+ {
+ const char *name;
+ const struct lttng_buffer_view context_name_view =
+ lttng_buffer_view_from_view(&view->buffer, offset, context_name_len);
+
+ if (!lttng_buffer_view_is_valid(&context_name_view)) {
+ ret = -1;
+ goto end;
+ }
+
+ name = context_name_view.data;
+
+ if (!lttng_buffer_view_contains_string(&context_name_view, name, context_name_len)) {
+ ret = -1;
+ goto end;
+ }
+
+ context_name = lttng_strndup(name, context_name_len);
+ if (!context_name) {
+ ret = -1;
+ goto end;
+ }
+
+ offset += context_name_len;
+ }
+
+ /* Transfer ownership of the strings */
+ event_ctx->u.app_ctx.provider_name = provider_name;
+ event_ctx->u.app_ctx.ctx_name = context_name;
+ provider_name = nullptr;
+ context_name = nullptr;
+
+ ret = offset;
+end:
+ free(provider_name);
+ free(context_name);
+
+ return ret;
+}
+
+static ssize_t
+lttng_event_context_perf_counter_populate_from_payload(const struct lttng_payload_view *view,
+ struct lttng_event_context *event_ctx)
+{
+ int ret;
+ ssize_t consumed, offset = 0;
+ const struct lttng_event_context_perf_counter_comm *comm;
+ size_t name_len;
+ const struct lttng_buffer_view comm_view =
+ lttng_buffer_view_from_view(&view->buffer, offset, sizeof(*comm));
+
+ assert(event_ctx->ctx == LTTNG_EVENT_CONTEXT_PERF_COUNTER ||
+ event_ctx->ctx == LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER ||
+ event_ctx->ctx == LTTNG_EVENT_CONTEXT_PERF_CPU_COUNTER);
+
+ if (!lttng_buffer_view_is_valid(&comm_view)) {
+ consumed = -1;
+ goto end;
+ }
+
+ comm = (typeof(comm)) comm_view.data;
+ offset += sizeof(*comm);
+
+ name_len = comm->name_len;
+
+ {
+ const char *name;
+ const struct lttng_buffer_view provider_name_view =
+ lttng_buffer_view_from_view(&view->buffer, offset, name_len);
+
+ if (!lttng_buffer_view_is_valid(&provider_name_view)) {
+ consumed = -1;
+ goto end;
+ }
+
+ name = provider_name_view.data;
+
+ if (!lttng_buffer_view_contains_string(&provider_name_view, name, name_len)) {
+ consumed = -1;
+ goto end;
+ }
+
+ ret = lttng_strncpy(event_ctx->u.perf_counter.name,
+ name,
+ sizeof(event_ctx->u.perf_counter.name));
+ if (ret) {
+ consumed = -1;
+ goto end;
+ }
+ offset += name_len;
+ }
+
+ event_ctx->u.perf_counter.config = comm->config;
+ event_ctx->u.perf_counter.type = comm->type;
+
+ consumed = offset;
+
+end:
+ return consumed;
+}
+
+ssize_t lttng_event_context_create_from_payload(struct lttng_payload_view *view,
+ struct lttng_event_context **event_ctx)
+{
+ ssize_t ret, offset = 0;
+ const struct lttng_event_context_comm *comm;
+ struct lttng_event_context *local_context = nullptr;
+ struct lttng_buffer_view comm_view =
+ lttng_buffer_view_from_view(&view->buffer, offset, sizeof(*comm));
+
+ assert(event_ctx);
+ assert(view);
+
+ if (!lttng_buffer_view_is_valid(&comm_view)) {
+ ret = -1;
+ goto end;
+ }
+
+ comm = (typeof(comm)) comm_view.data;
+ offset += sizeof(*comm);
+
+ local_context = zmalloc<lttng_event_context>();
+ if (!local_context) {
+ ret = -1;
+ goto end;
+ }
+
+ local_context->ctx = (lttng_event_context_type) comm->type;
+
+ {
+ struct lttng_payload_view subtype_view =
+ lttng_payload_view_from_view(view, offset, -1);
+
+ switch (local_context->ctx) {
+ case LTTNG_EVENT_CONTEXT_APP_CONTEXT:
+ ret = lttng_event_context_app_populate_from_payload(&subtype_view,
+ local_context);
+ break;
+ case LTTNG_EVENT_CONTEXT_PERF_COUNTER:
+ case LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER:
+ case LTTNG_EVENT_CONTEXT_PERF_CPU_COUNTER:
+ ret = lttng_event_context_perf_counter_populate_from_payload(&subtype_view,
+ local_context);
+ break;
+ default:
+ /* Nothing else to deserialize. */
+ ret = 0;
+ break;
+ }
+ }
+
+ if (ret < 0) {
+ goto end;
+ }
+
+ offset += ret;
+
+ *event_ctx = local_context;
+ local_context = nullptr;
+ ret = offset;
+
+end:
+ free(local_context);
+ return ret;
+}
+
+static int lttng_event_context_app_serialize(struct lttng_event_context *context,
+ struct lttng_payload *payload)
+{
+ int ret;
+ struct lttng_event_context_app_comm comm = {};
+ size_t provider_len, ctx_len;
+ const char *provider_name;
+ const char *ctx_name;
+
+ assert(payload);
+ assert(context);
+ assert(context->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT);
+
+ provider_name = context->u.app_ctx.provider_name;
+ ctx_name = context->u.app_ctx.ctx_name;
+
+ if (!provider_name || !ctx_name) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ provider_len = strlen(provider_name);
+ if (provider_len == 0) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ /* Include the null terminator. */
+ provider_len += 1;
+ comm.provider_name_len = provider_len;
+
+ ctx_len = strlen(ctx_name);
+ if (ctx_len == 0) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ /* Include the null terminator. */
+ ctx_len += 1;
+ comm.ctx_name_len = ctx_len;
+
+ /* Header */
+ ret = lttng_dynamic_buffer_append(&payload->buffer, &comm, sizeof(comm));
+ if (ret) {
+ ret = -1;
+ goto end;
+ }
+
+ ret = lttng_dynamic_buffer_append(&payload->buffer, provider_name, provider_len);
+ if (ret) {
+ ret = -1;
+ goto end;
+ }
+
+ ret = lttng_dynamic_buffer_append(&payload->buffer, ctx_name, ctx_len);
+ if (ret) {
+ ret = -1;
+ goto end;
+ }
+
+end:
+ return ret;
+}
+
+static int lttng_event_context_perf_counter_serialize(struct lttng_event_perf_counter_ctx *context,
+ struct lttng_payload *payload)
+{
+ int ret;
+ struct lttng_event_context_perf_counter_comm comm = {};
+
+ assert(payload);
+ assert(context);
+
+ comm.config = context->config;
+ comm.type = context->type;
+ comm.name_len = lttng_strnlen(context->name, sizeof(context->name));
+
+ if (comm.name_len == sizeof(context->name)) {
+ ret = -1;
+ goto end;
+ }
+
+ /* Include the null terminator. */
+ comm.name_len += 1;
+
+ /* Header */
+ ret = lttng_dynamic_buffer_append(&payload->buffer, &comm, sizeof(comm));
+ if (ret) {
+ ret = -1;
+ goto end;
+ }
+
+ ret = lttng_dynamic_buffer_append(&payload->buffer, context->name, comm.name_len);
+ if (ret) {
+ ret = -1;
+ goto end;
+ }
+
+end:
+ return ret;
+}
+
+int lttng_event_context_serialize(struct lttng_event_context *context,
+ struct lttng_payload *payload)
+{
+ int ret;
+ struct lttng_event_context_comm context_comm;
+
+ context_comm.type = 0;
+
+ assert(context);
+ assert(payload);
+
+ context_comm.type = (uint32_t) context->ctx;
+
+ /* Header */
+ ret = lttng_dynamic_buffer_append(&payload->buffer, &context_comm, sizeof(context_comm));
+ if (ret) {
+ goto end;
+ }
+
+ switch (context->ctx) {
+ case LTTNG_EVENT_CONTEXT_APP_CONTEXT:
+ ret = lttng_event_context_app_serialize(context, payload);
+ break;
+ case LTTNG_EVENT_CONTEXT_PERF_COUNTER:
+ case LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER:
+ case LTTNG_EVENT_CONTEXT_PERF_CPU_COUNTER:
+ ret = lttng_event_context_perf_counter_serialize(&context->u.perf_counter, payload);
+ break;
+ default:
+ /* Nothing else to serialize. */
+ break;
+ }
+
+ if (ret) {
+ goto end;
+ }
+
+end:
+ return ret;
+}
+
+void lttng_event_context_destroy(struct lttng_event_context *context)
+{
+ if (!context) {
+ return;
+ }
+
+ if (context->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) {
+ free(context->u.app_ctx.provider_name);
+ free(context->u.app_ctx.ctx_name);
+ }
+
+ free(context);
+}
+
+/*
+ * This is a specialized populate for lttng_event_field since it ignores
+ * the extension field of the lttng_event struct and simply copies what it can
+ * to the internal struct lttng_event of a lttng_event_field.
+ */
+static void lttng_event_field_populate_lttng_event_from_event(const struct lttng_event *src,
+ struct lttng_event *destination)
+{
+ memcpy(destination, src, sizeof(*destination));
+
+ /* Remove all possible dynamic data from the destination event rule. */
+ destination->extended.ptr = nullptr;
+}
+
+ssize_t lttng_event_field_create_from_payload(struct lttng_payload_view *view,
+ struct lttng_event_field **field)
+{
+ ssize_t ret, offset = 0;
+ struct lttng_event_field *local_event_field = nullptr;
+ struct lttng_event *event = nullptr;
+ const struct lttng_event_field_comm *comm;
+ const char *name = nullptr;
+
+ assert(field);
+ assert(view);
+
+ {
+ const struct lttng_buffer_view comm_view =
+ lttng_buffer_view_from_view(&view->buffer, offset, sizeof(*comm));
+
+ if (!lttng_buffer_view_is_valid(&comm_view)) {
+ ret = -1;
+ goto end;
+ }
+
+ /* lttng_event_field_comm header */
+ comm = (const lttng_event_field_comm *) comm_view.data;
+ offset += sizeof(*comm);
+ }
+
+ local_event_field = zmalloc<lttng_event_field>();
+ if (!local_event_field) {
+ ret = -1;
+ goto end;
+ }
+
+ local_event_field->type = (lttng_event_field_type) comm->type;
+ local_event_field->nowrite = comm->nowrite;
+
+ /* Field name */
+ {
+ const struct lttng_buffer_view name_view =
+ lttng_buffer_view_from_view(&view->buffer, offset, comm->name_len);
+
+ if (!lttng_buffer_view_is_valid(&name_view)) {
+ ret = -1;
+ goto end;
+ }
+
+ name = name_view.data;
+
+ if (!lttng_buffer_view_contains_string(&name_view, name_view.data, comm->name_len)) {
+ ret = -1;
+ goto end;
+ }
+
+ if (comm->name_len > LTTNG_SYMBOL_NAME_LEN - 1) {
+ /* Name is too long.*/
+ ret = -1;
+ goto end;
+ }
+
+ offset += comm->name_len;
+ }
+
+ /* Event */
+ {
+ struct lttng_payload_view event_view =
+ lttng_payload_view_from_view(view, offset, comm->event_len);
+
+ if (!lttng_payload_view_is_valid(&event_view)) {
+ ret = -1;
+ goto end;
+ }
+
+ ret = lttng_event_create_from_payload(
+ &event_view, &event, nullptr, nullptr, nullptr);
+ if (ret != comm->event_len) {
+ ret = -1;
+ goto end;
+ }
+
+ offset += ret;
+ }
+
+ assert(name);
+ assert(event);
+
+ if (lttng_strncpy(
+ local_event_field->field_name, name, sizeof(local_event_field->field_name))) {
+ ret = -1;
+ goto end;
+ }
+
+ lttng_event_field_populate_lttng_event_from_event(event, &local_event_field->event);
+
+ *field = local_event_field;
+ local_event_field = nullptr;
+ ret = offset;
+end:
+ lttng_event_destroy(event);
+ free(local_event_field);
+ return ret;
+}
+
+int lttng_event_field_serialize(const struct lttng_event_field *field,
+ struct lttng_payload *payload)
+{
+ int ret;
+ size_t header_offset, size_before_event;
+ size_t name_len;
+ struct lttng_event_field_comm event_field_comm = {};
+ struct lttng_event_field_comm *header;
+
+ assert(field);
+ assert(payload);
+
+ /* Save the header location for later in-place header update. */
+ header_offset = payload->buffer.size;
+
+ name_len = strnlen(field->field_name, sizeof(field->field_name));
+ if (name_len == sizeof(field->field_name)) {
+ /* Event name is not NULL-terminated. */
+ ret = -1;
+ goto end;
+ }
+
+ /* Add null termination. */
+ name_len += 1;
+
+ event_field_comm.type = field->type;
+ event_field_comm.nowrite = (uint8_t) field->nowrite;
+ event_field_comm.name_len = name_len;
+
+ /* Header */
+ ret = lttng_dynamic_buffer_append(
+ &payload->buffer, &event_field_comm, sizeof(event_field_comm));
+ if (ret) {
+ goto end;
+ }
+
+ /* Field name */
+ ret = lttng_dynamic_buffer_append(&payload->buffer, field->field_name, name_len);
+ if (ret) {
+ goto end;
+ }
+
+ size_before_event = payload->buffer.size;
+ ret = lttng_event_serialize(&field->event, 0, nullptr, nullptr, 0, nullptr, payload);
+ if (ret) {
+ ret = -1;
+ goto end;
+ }
+
+ /* Update the event len. */
+ header = (struct lttng_event_field_comm *) ((char *) payload->buffer.data + header_offset);
+ header->event_len = payload->buffer.size - size_before_event;
+
+end:
+ return ret;
+}
+
+static enum lttng_error_code compute_flattened_size(struct lttng_dynamic_pointer_array *events,
+ size_t *size)