#!/bin/bash
#
# Copyright (C) 2017 Jonathan Rajotte-Julien <jonathan.rajotte-julien@efficios.com>
#
# SPDX-License-Identifier: LGPL-2.1-only

CURDIR=$(dirname $0)/
TESTDIR=$CURDIR/../../../

TMPDIR=$(mktemp -d)

#This is needed since the testpoint create a pipe with the consumerd type suffixed
TESTPOINT_BASE_PATH=$(readlink -f "$TMPDIR/lttng.t_p_n")
TESTPOINT_PIPE_PATH=$(mktemp -u "${TESTPOINT_BASE_PATH}.XXXXXX")
TESTPOIT_ARGS="CONSUMER_PAUSE_PIPE_PATH=${TESTPOINT_PIPE_PATH} LTTNG_TESTPOINT_ENABLE=1"
TESTPOINT=$(readlink -f ${CURDIR}/.libs/libpause_consumer.so)


TESTAPP_PATH="$TESTDIR/utils/testapp"
TESTAPP_NAME="gen-ust-events"
TESTAPP_BIN="$TESTAPP_PATH/$TESTAPP_NAME/$TESTAPP_NAME"
TESTAPP_STATE_PATH=$(mktemp -u "$TMPDIR/application_state.XXXXXXXXXX")

NR_ITER=-1
NR_USEC_WAIT=5

SESSION_NAME="my_session"
CHANNEL_NAME="my_channel"

TRACE_PATH=$(mktemp -d)
PAGE_SIZE=$(getconf PAGE_SIZE)

DIR=$(readlink -f $TESTDIR)
NUM_TESTS=104

source $TESTDIR/utils/utils.sh

function kernel_event_generator_toggle_state
{
	kernel_event_generator_suspended=$((kernel_event_generator_suspended==0))

}
function kernel_event_generator
{
	state_file=$1
	kernel_event_generator_suspended=0
	trap kernel_event_generator_toggle_state SIGUSR1

	while (true); do
		if [[ $kernel_event_generator_suspended -eq "1" ]]; then
			touch $state_file
			sleep 0.5
		else
			if [[ -f $state_file ]]; then
				rm $state_file 2> /dev/null
			fi
			echo -n "1000" > /proc/lttng-test-filter-event 2> /dev/null
		fi
	done
}

function kernel_test
{
	local consumerd_pipe=()
	local event_name="lttng_test_filter_event"

	modprobe lttng-test

	LTTNG_SESSIOND_ENV_VARS="LTTNG_TESTPOINT_ENABLE=1 CONSUMER_PAUSE_PIPE_PATH=${TESTPOINT_PIPE_PATH} LD_PRELOAD=${TESTPOINT}"
	start_lttng_sessiond_notap

	create_lttng_session_notap $SESSION_NAME $TRACE_PATH

	lttng_enable_kernel_channel_notap $SESSION_NAME $CHANNEL_NAME --subbuf-size=$PAGE_SIZE
	enable_kernel_lttng_event_notap $SESSION_NAME $event_name $CHANNEL_NAME

	#This is needed since the testpoint create a pipe with the consumer type suffixed
	for f in "$TESTPOINT_BASE_PATH"*; do
		consumerd_pipe+=("$f")
	done

	kernel_event_generator $TESTAPP_STATE_PATH &
	APP_PID=$!

	$CURDIR/notification LTTNG_DOMAIN_KERNEL $SESSION_NAME $CHANNEL_NAME $APP_PID $TESTAPP_STATE_PATH ${consumerd_pipe[@]}

	destroy_lttng_session_notap $SESSION_NAME
	stop_lttng_sessiond_notap

	kill -9 $APP_PID
	wait $APP_PID 2> /dev/null


	rmmod lttng-test

	rm -rf ${consumerd_pipe[@]} 2> /dev/null
}

if [ "$(id -u)" == "0" ]; then
	validate_lttng_modules_present
	kernel_test
else
	# Kernel tests are skipped.
	plan_tests $NUM_TESTS
	skip 0 "Root access is needed. Skipping all kernel notification tests." $NUM_TESTS
fi

# Just in case cleanup
rm -rf $TRACE_PATH
rm -rf $TMPDIR