Fix: check for lttng modules presence before testing

[lttng-tools.git] / src / bin / lttng-sessiond / rotate.c

/*
 * Copyright (C) 2017 - Julien Desfossez <jdesfossez@efficios.com>
 * Copyright (C) 2018 - 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.
 *
 * 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.
 */

#define _LGPL_SOURCE
#include <lttng/trigger/trigger.h>
#include <common/error.h>
#include <common/config/session-config.h>
#include <common/defaults.h>
#include <common/utils.h>
#include <common/futex.h>
#include <common/align.h>
#include <common/time.h>
#include <common/hashtable/utils.h>
#include <common/kernel-ctl/kernel-ctl.h>
#include <sys/eventfd.h>
#include <sys/stat.h>
#include <time.h>
#include <signal.h>
#include <inttypes.h>

#include <lttng/notification/channel-internal.h>
#include <lttng/rotate-internal.h>

#include "session.h"
#include "rotate.h"
#include "rotation-thread.h"
#include "lttng-sessiond.h"
#include "health-sessiond.h"
#include "cmd.h"
#include "utils.h"
#include "notification-thread-commands.h"

#include <urcu.h>
#include <urcu/list.h>
#include <urcu/rculfhash.h>

int subscribe_session_consumed_size_rotation(struct ltt_session *session, uint64_t size,
		struct notification_thread_handle *notification_thread_handle)
{
	int ret;
	enum lttng_condition_status condition_status;
	enum lttng_notification_channel_status nc_status;
	struct lttng_action *action;

	session->rotate_condition = lttng_condition_session_consumed_size_create();
	if (!session->rotate_condition) {
		ERR("Failed to create session consumed size condition object");
		ret = -1;
		goto end;
	}

	condition_status = lttng_condition_session_consumed_size_set_threshold(
			session->rotate_condition, size);
	if (condition_status != LTTNG_CONDITION_STATUS_OK) {
		ERR("Could not set session consumed size condition threshold (size = %" PRIu64 ")",
				size);
		ret = -1;
		goto end;
	}

	condition_status =
			lttng_condition_session_consumed_size_set_session_name(
				session->rotate_condition, session->name);
	if (condition_status != LTTNG_CONDITION_STATUS_OK) {
		ERR("Could not set session consumed size condition session name (name = %s)",
				session->name);
		ret = -1;
		goto end;
	}

	action = lttng_action_notify_create();
	if (!action) {
		ERR("Could not create notify action");
		ret = -1;
		goto end;
	}

	session->rotate_trigger = lttng_trigger_create(session->rotate_condition,
			action);
	if (!session->rotate_trigger) {
		ERR("Could not create size-based rotation trigger");
		ret = -1;
		goto end;
	}

	nc_status = lttng_notification_channel_subscribe(
			rotate_notification_channel, session->rotate_condition);
	if (nc_status != LTTNG_NOTIFICATION_CHANNEL_STATUS_OK) {
		ERR("Could not subscribe to session consumed size notification");
		ret = -1;
		goto end;
	}

	ret = notification_thread_command_register_trigger(
			notification_thread_handle, session->rotate_trigger);
	if (ret < 0 && ret != -LTTNG_ERR_TRIGGER_EXISTS) {
		ERR("Register trigger, %s", lttng_strerror(ret));
		ret = -1;
		goto end;
	}

	ret = 0;

end:
	return ret;
}

int unsubscribe_session_consumed_size_rotation(struct ltt_session *session,
		struct notification_thread_handle *notification_thread_handle)
{
	int ret = 0;
	enum lttng_notification_channel_status status;

	status = lttng_notification_channel_unsubscribe(
			rotate_notification_channel,
			session->rotate_condition);
	if (status != LTTNG_NOTIFICATION_CHANNEL_STATUS_OK) {
		ERR("Session unsubscribe error: %d", (int) status);
		ret = -1;
		goto end;
	}

	ret = notification_thread_command_unregister_trigger(
			notification_thread_handle, session->rotate_trigger);
	if (ret != LTTNG_OK) {
		ERR("Session unregister trigger error: %d", ret);
		goto end;
	}

	ret = 0;
end:
	return ret;
}