Add client notification API

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

diff --git a/src/common/condition.c b/src/common/condition.c
new file mode 100644 (file)
index 0000000..0b18442
--- /dev/null
+++ b/src/common/condition.c
@@ -0,0 +1,169 @@
+/*
+ * 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/condition-internal.h>
+#include <lttng/condition/buffer-usage-internal.h>
+#include <common/macros.h>
+#include <common/error.h>
+#include <common/dynamic-buffer.h>
+#include <common/buffer-view.h>
+#include <stdbool.h>
+#include <assert.h>
+
+enum lttng_condition_type lttng_condition_get_type(
+               const struct lttng_condition *condition)
+{
+       return condition ? condition->type : LTTNG_CONDITION_TYPE_UNKNOWN;
+}
+
+void lttng_condition_destroy(struct lttng_condition *condition)
+{
+       if (!condition) {
+               return;
+       }
+
+       assert(condition->destroy);
+       condition->destroy(condition);
+}
+
+LTTNG_HIDDEN
+bool lttng_condition_validate(const struct lttng_condition *condition)
+{
+       bool valid;
+
+       if (!condition) {
+               valid = false;
+               goto end;
+       }
+
+       if (!condition->validate) {
+               /* Sub-class guarantees that it can never be invalid. */
+               valid = true;
+               goto end;
+       }
+
+       valid = condition->validate(condition);
+end:
+       return valid;
+}
+
+LTTNG_HIDDEN
+ssize_t lttng_condition_serialize(const struct lttng_condition *condition,
+               char *buf)
+{
+       ssize_t ret, condition_size;
+       struct lttng_condition_comm condition_comm;
+
+       if (!condition) {
+               ret = -1;
+               goto end;
+       }
+
+       condition_comm.condition_type = (int8_t) condition->type;
+       ret = sizeof(struct lttng_condition_comm);
+       if (buf) {
+               memcpy(buf, &condition_comm, ret);
+               buf += ret;
+       }
+
+       condition_size = condition->serialize(condition, buf);
+       if (condition_size < 0) {
+               ret = condition_size;
+               goto end;
+       }
+       ret += condition_size;
+end:
+       return ret;
+}
+
+LTTNG_HIDDEN
+bool lttng_condition_is_equal(const struct lttng_condition *a,
+               const struct lttng_condition *b)
+{
+       bool is_equal = false;
+
+       if (!a || !b) {
+               goto end;
+       }
+
+       if (a->type != b->type) {
+               goto end;
+       }
+
+       is_equal = a->equal ? a->equal(a, b) : true;
+end:
+       return is_equal;
+}
+
+LTTNG_HIDDEN
+ssize_t lttng_condition_create_from_buffer(
+               const struct lttng_buffer_view *buffer,
+               struct lttng_condition **condition)
+{
+       ssize_t ret, condition_size = 0;
+       const struct lttng_condition_comm *condition_comm;
+       condition_create_from_buffer_cb create_from_buffer = NULL;
+
+       if (!buffer || !condition) {
+               ret = -1;
+               goto end;
+       }
+
+       DBG("Deserializing condition from buffer");
+       condition_comm = (const struct lttng_condition_comm *) buffer->data;
+       condition_size += sizeof(*condition_comm);
+
+       switch ((enum lttng_condition_type) condition_comm->condition_type) {
+       case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW:
+               create_from_buffer = lttng_condition_buffer_usage_low_create_from_buffer;
+               break;
+       case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH:
+               create_from_buffer = lttng_condition_buffer_usage_high_create_from_buffer;
+               break;
+       default:
+               ERR("Attempted to create condition of unknown type (%i)",
+                               (int) condition_comm->condition_type);
+               ret = -1;
+               goto end;
+       }
+
+       if (create_from_buffer) {
+               const struct lttng_buffer_view view =
+                               lttng_buffer_view_from_view(buffer,
+                                       sizeof(*condition_comm), -1);
+
+               ret = create_from_buffer(&view, condition);
+               if (ret < 0) {
+                       goto end;
+               }
+               condition_size += ret;
+
+       } else {
+               abort();
+       }
+
+       ret = condition_size;
+end:
+       return ret;
+}
+
+LTTNG_HIDDEN
+void lttng_condition_init(struct lttng_condition *condition,
+               enum lttng_condition_type type)
+{
+       condition->type = type;
+}