Add client notification API

[lttng-tools.git] / src / common / evaluation.c

diff --git a/src/common/evaluation.c b/src/common/evaluation.c
new file mode 100644 (file)
index 0000000..c6243d2
--- /dev/null
+++ b/src/common/evaluation.c
@@ -0,0 +1,113 @@
+/*
+ * Copyright (C) 2017 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
+ *
+ * This library is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License, version 2.1 only,
+ * as published by the Free Software Foundation.
+ *
+ * This library is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <lttng/condition/evaluation-internal.h>
+#include <lttng/condition/buffer-usage-internal.h>
+#include <common/macros.h>
+#include <common/error.h>
+#include <stdbool.h>
+#include <assert.h>
+
+LTTNG_HIDDEN
+ssize_t lttng_evaluation_serialize(struct lttng_evaluation *evaluation,
+               char *buf)
+{
+       ssize_t ret, offset = 0;
+       struct lttng_evaluation_comm evaluation_comm;
+
+       evaluation_comm.type = (int8_t) evaluation->type;
+       if (buf) {
+               memcpy(buf, &evaluation_comm, sizeof(evaluation_comm));
+       }
+       offset += sizeof(evaluation_comm);
+
+       if (evaluation->serialize) {
+               ret = evaluation->serialize(evaluation,
+                               buf ? (buf + offset) : NULL);
+               if (ret < 0) {
+                       goto end;
+               }
+               offset += ret;
+       }
+
+       ret = offset;
+end:
+       return ret;
+}
+
+LTTNG_HIDDEN
+ssize_t lttng_evaluation_create_from_buffer(
+               const struct lttng_buffer_view *src_view,
+               struct lttng_evaluation **evaluation)
+{
+       ssize_t ret, evaluation_size = 0;
+       const struct lttng_evaluation_comm *evaluation_comm;
+       const struct lttng_buffer_view evaluation_view =
+                       lttng_buffer_view_from_view(src_view,
+                       sizeof(*evaluation_comm), -1);
+
+       if (!src_view || !evaluation) {
+               ret = -1;
+               goto end;
+       }
+
+       evaluation_comm = (const struct lttng_evaluation_comm *) src_view->data;
+       evaluation_size += sizeof(*evaluation_comm);
+
+       switch ((enum lttng_condition_type) evaluation_comm->type) {
+       case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW:
+               ret = lttng_evaluation_buffer_usage_low_create_from_buffer(
+                               &evaluation_view, evaluation);
+               if (ret < 0) {
+                       goto end;
+               }
+               evaluation_size += ret;
+               break;
+       case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH:
+               ret = lttng_evaluation_buffer_usage_high_create_from_buffer(
+                               &evaluation_view, evaluation);
+               if (ret < 0) {
+                       goto end;
+               }
+               evaluation_size += ret;
+               break;
+       default:
+               ERR("Attempted to create evaluation of unknown type (%i)",
+                               (int) evaluation_comm->type);
+               ret = -1;
+               goto end;
+       }
+       ret = evaluation_size;
+end:
+       return ret;
+}
+
+enum lttng_condition_type lttng_evaluation_get_type(
+               const struct lttng_evaluation *evaluation)
+{
+       return evaluation ? evaluation->type : LTTNG_CONDITION_TYPE_UNKNOWN;
+}
+
+void lttng_evaluation_destroy(struct lttng_evaluation *evaluation)
+{
+       if (!evaluation) {
+               return;
+       }
+
+       assert(evaluation->destroy);
+       evaluation->destroy(evaluation);
+}