X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=include%2Flttng%2Ftrigger%2Ftrigger.h;h=e92897fd541e79accfeac412393dd780e1014a4d;hp=b2eab0e3da9fa10192b2f6a05da110c0178523c9;hb=64eafdf60552bbd7e22fb1c8fc8fc2b42a3cf68b;hpb=a58c490f0bff52a73717d31d04d1472629180de2

diff --git a/include/lttng/trigger/trigger.h b/include/lttng/trigger/trigger.h
index b2eab0e3d..e92897fd5 100644
--- a/include/lttng/trigger/trigger.h
+++ b/include/lttng/trigger/trigger.h
@@ -1,23 +1,15 @@
 /*
- * Copyright (C) 2017 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
+ * 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.
+ * SPDX-License-Identifier: LGPL-2.1-only
  *
- * 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
  */
 
 #ifndef LTTNG_TRIGGER_H
 #define LTTNG_TRIGGER_H
 
+#include <sys/types.h>
+
 struct lttng_action;
 struct lttng_condition;
 struct lttng_trigger;
@@ -31,20 +23,100 @@ enum lttng_register_trigger_status {
 	LTTNG_REGISTER_TRIGGER_STATUS_INVALID = -1,
 };
 
-/* The caller retains the ownership of both condition and action. */
+enum lttng_trigger_status {
+	LTTNG_TRIGGER_STATUS_OK = 0,
+	LTTNG_TRIGGER_STATUS_ERROR = -1,
+	LTTNG_TRIGGER_STATUS_UNKNOWN = -2,
+	LTTNG_TRIGGER_STATUS_INVALID = -3,
+	LTTNG_TRIGGER_STATUS_UNSET = -4,
+	LTTNG_TRIGGER_STATUS_UNSUPPORTED = -5,
+	LTTNG_TRIGGER_STATUS_PERMISSION_DENIED = -6,
+};
+
+/*
+ * Create a trigger object associating a condition and an action.
+ *
+ * A trigger associates a condition and an action to take whenever the
+ * condition evaluates to true. Such actions can, for example, consist
+ * in the emission of a notification to clients listening through
+ * notification channels.
+ *
+ * The caller retains the ownership of both the condition and action
+ * and both must be kept alive for the lifetime of the trigger object.
+ *
+ * A trigger must be registered in order to become activate and can
+ * be destroyed after its registration.
+ *
+ * Returns a trigger object on success, NULL on error.
+ * Trigger objects must be destroyed using the lttng_trigger_destroy()
+ * function.
+ */
 extern struct lttng_trigger *lttng_trigger_create(
 		struct lttng_condition *condition, struct lttng_action *action);
 
+/*
+ * Set the user identity (uid) of a trigger.
+ *
+ * Only available for the root user (uid 0).
+ *
+ * Returns LTTNG_TRIGGER_STATUS_OK on success,
+ * LTTNG_TRIGGER_STATUS_EPERM if not authorized,
+ * LTTNG_TRIGGER_STATUS_INVALID if invalid parameters are passed.
+ */
+extern enum lttng_trigger_status lttng_trigger_set_owner_uid(
+		struct lttng_trigger *trigger, uid_t uid);
+
+/*
+ * Get the user identity (uid) of a trigger.
+ *
+ * Returns LTTNG_TRIGGER_STATUS_OK on success,
+ * LTTNG_TRIGGER_STATUS_UNSET if unset,
+ * LTTNG_TRIGGER_STATUS_INVALID if invalid parameters are passed.
+ */
+extern enum lttng_trigger_status lttng_trigger_get_owner_uid(
+		const struct lttng_trigger *trigger, uid_t *uid);
+
+/*
+ * Get the condition of a trigger.
+ *
+ * The caller acquires no ownership of the returned condition.
+ *
+ * Returns a condition on success, NULL on error.
+ */
 extern struct lttng_condition *lttng_trigger_get_condition(
 		struct lttng_trigger *trigger);
 
+/*
+ * Get the action of a trigger.
+ *
+ * The caller acquires no ownership of the returned action.
+ *
+ * Returns an action on success, NULL on error.
+ */
 extern struct lttng_action *lttng_trigger_get_action(
 		struct lttng_trigger *trigger);
 
+/*
+ * Destroy (frees) a trigger object.
+ */
 extern void lttng_trigger_destroy(struct lttng_trigger *trigger);
 
+/*
+ * Register a trigger to the session daemon.
+ *
+ * The trigger can be destroyed after this call.
+ *
+ * Return 0 on success, a negative LTTng error code on error.
+ */
 extern int lttng_register_trigger(struct lttng_trigger *trigger);
 
+/*
+ * Unregister a trigger from the session daemon.
+ *
+ * The trigger can be destroyed after this call.
+ *
+ * Return 0 on success, a negative LTTng error code on error.
+ */
 extern int lttng_unregister_trigger(struct lttng_trigger *trigger);
 
 #ifdef __cplusplus