SoW-2019-0002: Dynamic Snapshot

[lttng-tools.git] / src / bin / lttng-sessiond / agent.h

diff --git a/src/bin/lttng-sessiond/agent.h b/src/bin/lttng-sessiond/agent.h
index 2b3d864a6515b54ff5cf817ab818d2da3e66c8da..ebb12628e15ebd08cae0981021991a3a193bd527 100644 (file)
--- a/src/bin/lttng-sessiond/agent.h
+++ b/src/bin/lttng-sessiond/agent.h
@@ -1,18 +1,9 @@
 /*
- * Copyright (C) 2013 - David Goulet <dgoulet@efficios.com>
+ * Copyright (C) 2013 David Goulet <dgoulet@efficios.com>
+ * Copyright (C) 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com>
  *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License, version 2 only, as
- * published by the Free Software Foundation.
+ * SPDX-License-Identifier: GPL-2.0-only
  *
- * This program 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 General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along with
- * this program; if not, write to the Free Software Foundation, Inc., 51
- * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
 #ifndef LTTNG_SESSIOND_AGENT_H
@@ -33,11 +24,15 @@
  */
 extern struct lttng_ht *agent_apps_ht_by_sock;
 
+/*
+ * Hash table that contains the trigger agents by domain */
+extern struct lttng_ht *trigger_agents_ht_by_domain;
+
 struct agent_ht_key {
        const char *name;
        int loglevel_value;
        enum lttng_loglevel_type loglevel_type;
-       char *filter_expression;
+       const char *filter_expression;
 };
 
 /*
@@ -96,6 +91,12 @@ struct agent_event {
        struct lttng_filter_bytecode *filter;
        char *filter_expression;
        struct lttng_event_exclusion *exclusion;
+
+       /*
+        * Multiple triggers and events can use this agent event.
+        * The event can only be disabled when the count is zero.
+        */
+       unsigned int user_refcount;
 };
 
 /*
@@ -116,6 +117,9 @@ struct agent {
        /* Contains event indexed by name. */
        struct lttng_ht *events;
 
+       /* Application context list (struct agent_app_ctx). */
+       struct cds_list_head app_ctx_list;
+
        /* Node used for the hash table indexed by domain type. */
        struct lttng_ht_node_u64 node;
 };
@@ -139,8 +143,10 @@ struct agent_event *agent_create_event(const char *name,
 void agent_add_event(struct agent_event *event, struct agent *agt);
 
 struct agent_event *agent_find_event(const char *name,
-               enum lttng_loglevel_type loglevel_type, int loglevel_value,
-               char *filter_expression, struct agent *agt);
+               enum lttng_loglevel_type loglevel_type,
+               int loglevel_value,
+               const char *filter_expression,
+               struct agent *agt);
 void agent_find_events_by_name(const char *name, struct agent *agt,
                struct lttng_ht_iter* iter);
 void agent_event_next_duplicate(const char *name,
@@ -148,6 +154,12 @@ void agent_event_next_duplicate(const char *name,
 void agent_delete_event(struct agent_event *event, struct agent *agt);
 void agent_destroy_event(struct agent_event *event);
 
+/* Agent context API.*/
+int agent_enable_context(const struct lttng_event_context *ctx,
+               enum lttng_domain_type domain);
+int agent_add_context(const struct lttng_event_context *ctx,
+               struct agent *agt);
+
 /* Agent app API. */
 struct agent_app *agent_create_app(pid_t pid, enum lttng_domain_type domain,
                struct lttcomm_sock *sock);
@@ -167,4 +179,12 @@ void agent_update(struct agent *agt, int sock);
 int agent_list_events(struct lttng_event **events,
                enum lttng_domain_type domain);
 
+struct agent_event *agent_find_event_by_trigger(
+               const struct lttng_trigger *trigger, struct agent *agt);
+
+/* todo: find a better place for this */
+struct agent *trigger_find_agent(enum lttng_domain_type domain_type);
+void trigger_agent_ht_clean(void);
+int trigger_agent_ht_alloc(void);
+
 #endif /* LTTNG_SESSIOND_AGENT_H */