/*
* Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
*/
-ssize_t cmd_list_tracepoint_fields(enum lttng_domain_type domain,
- struct lttng_event_field **fields)
+enum lttng_error_code cmd_list_tracepoint_fields(enum lttng_domain_type domain,
+ struct lttng_payload *reply)
{
+ enum lttng_error_code ret_code;
int ret;
- ssize_t nb_fields = 0;
+ unsigned int i, nb_fields;
+ struct lttng_event_field *fields = NULL;
+ struct lttcomm_list_command_header reply_command_header = {};
+ size_t reply_command_header_offset;
+
+ assert(reply);
+
+ /* Reserve space for command reply header. */
+ reply_command_header_offset = reply->buffer.size;
+ ret = lttng_dynamic_buffer_set_size(&reply->buffer,
+ reply_command_header_offset +
+ sizeof(struct lttcomm_list_command_header));
+ if (ret) {
+ ret_code = LTTNG_ERR_NOMEM;
+ goto error;
+ }
switch (domain) {
case LTTNG_DOMAIN_UST:
- nb_fields = ust_app_list_event_fields(fields);
- if (nb_fields < 0) {
- ret = LTTNG_ERR_UST_LIST_FAIL;
+ ret = ust_app_list_event_fields(&fields);
+ if (ret < 0) {
+ ret_code = LTTNG_ERR_UST_LIST_FAIL;
goto error;
}
+
break;
case LTTNG_DOMAIN_KERNEL:
default: /* fall-through */
- ret = LTTNG_ERR_UND;
+ ret_code = LTTNG_ERR_UND;
goto error;
}
- return nb_fields;
+ nb_fields = ret;
+
+ for (i = 0; i < nb_fields; i++) {
+ ret = lttng_event_field_serialize(&fields[i], reply);
+ if (ret) {
+ ret_code = LTTNG_ERR_NOMEM;
+ goto error;
+ }
+ }
+
+ if (nb_fields > UINT32_MAX) {
+ ERR("Tracepoint field count would overflow the tracepoint field listing command's reply");
+ ret_code = LTTNG_ERR_OVERFLOW;
+ goto error;
+ }
+
+ /* Update command reply header. */
+ reply_command_header.count = (uint32_t) nb_fields;
+
+ memcpy(reply->buffer.data + reply_command_header_offset, &reply_command_header,
+ sizeof(reply_command_header));
+
+ ret_code = LTTNG_OK;
error:
- /* Return negative value to differentiate return code */
- return -ret;
+ free(fields);
+ return ret_code;
}
enum lttng_error_code cmd_list_syscalls(
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 = NULL;
+}
+
+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 = NULL;
+ struct lttng_event *event = NULL;
+ const struct lttng_event_field_comm *comm;
+ const char* name = NULL;
+
+ 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 = (struct lttng_event_field *)
+ zmalloc(sizeof(*local_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, NULL,
+ NULL, NULL);
+ if (ret != comm->event_len) {
+ ret = -1;
+ goto end;
+ }
+
+ offset += ret;
+ }
+
+ assert(name);
+ assert(event);
+
+ if (lttng_strncpy(local_event_field->field_name, name , LTTNG_SYMBOL_NAME_LEN)) {
+ ret = -1;
+ goto end;
+ }
+
+ lttng_event_field_populate_lttng_event_from_event(
+ event, &local_event_field->event);
+
+ *field = local_event_field;
+ local_event_field = NULL;
+ 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 = { 0 };
+ 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, LTTNG_SYMBOL_NAME_LEN);
+ if (name_len == LTTNG_SYMBOL_NAME_LEN) {
+ /* 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, NULL, NULL, 0, 0, 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)
{
lttng_dynamic_pointer_array_reset(&local_events);
return ret;
}
+
+static enum lttng_error_code flatten_lttng_event_fields(
+ struct lttng_dynamic_pointer_array *event_fields,
+ struct lttng_event_field **flattened_event_fields)
+{
+ int ret, i;
+ enum lttng_error_code ret_code;
+ size_t storage_req = 0;
+ struct lttng_dynamic_buffer local_flattened_event_fields;
+ int nb_event_field;
+
+ assert(event_fields);
+ assert(flattened_event_fields);
+
+ lttng_dynamic_buffer_init(&local_flattened_event_fields);
+ nb_event_field = lttng_dynamic_pointer_array_get_count(event_fields);
+
+ /*
+ * Here even if the event field contains a `struct lttng_event` that
+ * could contain dynamic data, in reality it is not the case.
+ * Dynamic data is not present. Here the flattening is mostly a direct
+ * memcpy. This is less than ideal but this code is still better than
+ * direct usage of an unpacked lttng_event_field array.
+ */
+ storage_req += sizeof(struct lttng_event_field) * nb_event_field;
+
+ lttng_dynamic_buffer_init(&local_flattened_event_fields);
+
+ /*
+ * We must ensure that "local_flattened_event_fields" is never resized
+ * so as to preserve the validity of the flattened objects.
+ */
+ ret = lttng_dynamic_buffer_set_capacity(
+ &local_flattened_event_fields, storage_req);
+ if (ret) {
+ ret_code = LTTNG_ERR_NOMEM;
+ goto end;
+ }
+
+ for (i = 0; i < nb_event_field; i++) {
+ const struct lttng_event_field *element =
+ (const struct lttng_event_field *)
+ lttng_dynamic_pointer_array_get_pointer(
+ event_fields, i);
+
+ if (!element) {
+ ret_code = LTTNG_ERR_FATAL;
+ goto end;
+ }
+ ret = lttng_dynamic_buffer_append(&local_flattened_event_fields,
+ element, sizeof(struct lttng_event_field));
+ if (ret) {
+ ret_code = LTTNG_ERR_NOMEM;
+ goto end;
+ }
+ }
+
+ /* Don't reset local_flattened_channels buffer as we return its content. */
+ *flattened_event_fields = (struct lttng_event_field *) local_flattened_event_fields.data;
+ lttng_dynamic_buffer_init(&local_flattened_event_fields);
+ ret_code = LTTNG_OK;
+end:
+ lttng_dynamic_buffer_reset(&local_flattened_event_fields);
+ return ret_code;
+}
+
+static enum lttng_error_code event_field_list_create_from_payload(
+ struct lttng_payload_view *view,
+ unsigned int count,
+ struct lttng_dynamic_pointer_array **event_field_list)
+{
+ enum lttng_error_code ret_code;
+ int ret, offset = 0;
+ unsigned int i;
+ struct lttng_dynamic_pointer_array *list = NULL;
+
+ assert(view);
+ assert(event_field_list);
+
+ list = (struct lttng_dynamic_pointer_array *) zmalloc(sizeof(*list));
+ if (!list) {
+ ret_code = LTTNG_ERR_NOMEM;
+ goto end;
+ }
+
+ lttng_dynamic_pointer_array_init(list, free);
+
+ for (i = 0; i < count; i++) {
+ ssize_t event_field_size;
+ struct lttng_event_field *field = NULL;
+ struct lttng_payload_view event_field_view =
+ lttng_payload_view_from_view(view, offset, -1);
+
+ event_field_size = lttng_event_field_create_from_payload(
+ &event_field_view, &field);
+ if (event_field_size < 0) {
+ ret_code = LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ /* Lifetime and management of the object is now bound to the array. */
+ ret = lttng_dynamic_pointer_array_add_pointer(list, field);
+ if (ret) {
+ free(field);
+ ret_code = LTTNG_ERR_NOMEM;
+ goto end;
+ }
+
+ offset += event_field_size;
+ }
+
+ if (view->buffer.size != offset) {
+ ret_code = LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ *event_field_list = list;
+ list = NULL;
+ ret_code = LTTNG_OK;
+
+end:
+ if (list) {
+ lttng_dynamic_pointer_array_reset(list);
+ free(list);
+ }
+
+ return ret_code;
+}
+
+enum lttng_error_code lttng_event_fields_create_and_flatten_from_payload(
+ struct lttng_payload_view *view,
+ unsigned int count,
+ struct lttng_event_field **fields)
+{
+ enum lttng_error_code ret_code;
+ struct lttng_dynamic_pointer_array *local_event_fields = NULL;
+
+ ret_code = event_field_list_create_from_payload(
+ view, count, &local_event_fields);
+ if (ret_code != LTTNG_OK) {
+ goto end;
+ }
+
+ ret_code = flatten_lttng_event_fields(local_event_fields, fields);
+ if (ret_code != LTTNG_OK) {
+ goto end;
+ }
+end:
+ if (local_event_fields) {
+ lttng_dynamic_pointer_array_reset(local_event_fields);
+ free(local_event_fields);
+ }
+
+ return ret_code;
+}
int lttng_list_tracepoint_fields(struct lttng_handle *handle,
struct lttng_event_field **fields)
{
+ enum lttng_error_code ret_code;
int ret;
struct lttcomm_session_msg lsm;
+ const struct lttcomm_list_command_header *cmd_header = NULL;
+ unsigned int nb_event_fields = 0;
+ struct lttng_payload reply;
if (handle == NULL) {
- return -LTTNG_ERR_INVALID;
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
}
+ lttng_payload_init(&reply);
+
memset(&lsm, 0, sizeof(lsm));
lsm.cmd_type = LTTNG_LIST_TRACEPOINT_FIELDS;
COPY_DOMAIN_PACKED(lsm.domain, handle->domain);
- ret = lttng_ctl_ask_sessiond(&lsm, (void **) fields);
- if (ret < 0) {
- return ret;
+ {
+ lttng_payload_view message_view =
+ lttng_payload_view_init_from_buffer(
+ (const char *) &lsm, 0,
+ sizeof(lsm));
+
+ ret = lttng_ctl_ask_sessiond_payload(&message_view, &reply);
+ if (ret < 0) {
+ goto end;
+ }
+ }
+
+ {
+ const lttng_buffer_view cmd_header_view =
+ lttng_buffer_view_from_dynamic_buffer(
+ &reply.buffer, 0, sizeof(*cmd_header));
+
+ if (!lttng_buffer_view_is_valid(&cmd_header_view)) {
+ ret = -LTTNG_ERR_INVALID_PROTOCOL;
+ goto end;
+ }
+
+ cmd_header = (struct lttcomm_list_command_header *)
+ cmd_header_view.data;
+ }
+
+ if (cmd_header->count > INT_MAX) {
+ ret = -LTTNG_ERR_OVERFLOW;
+ goto end;
+ }
+
+ nb_event_fields = cmd_header->count;
+
+ {
+ lttng_payload_view reply_view =
+ lttng_payload_view_from_payload(&reply,
+ sizeof(*cmd_header), -1);
+
+ ret_code = lttng_event_fields_create_and_flatten_from_payload(
+ &reply_view, nb_event_fields, fields);
+ if (ret_code != LTTNG_OK) {
+ ret = -ret_code;
+ goto end;
+ }
}
- return ret / sizeof(struct lttng_event_field);
+ ret = nb_event_fields;
+
+end:
+ return ret;
}
/*
projects / lttng-tools.git / commitdiff
