Test for lttng-logger

Basic test to write in /proc/lttng-logger and /dev/lttng-logger and
ensure we have the right amount of events in the trace resulting trace.
We also test the 1024 characters limit for the payload.

Signed-off-by: Julien Desfossez <jdesfossez@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>

diff --git a/tests/regression/kernel/Makefile.am b/tests/regression/kernel/Makefile.am
index c4ee443908cf6bc31c9510a47599bd72f55187d8..a0abc7baf2b010ebc83e055b3f11c4dc450a2da6 100644 (file)
--- a/tests/regression/kernel/Makefile.am
+++ b/tests/regression/kernel/Makefile.am
@@ -1,6 +1,6 @@
 EXTRA_DIST = test_event_basic test_all_events test_syscall \
                test_clock_override test_rotation_destroy_flush \
-               test_select_poll_epoll
+               test_select_poll_epoll test_lttng_logger
 
 noinst_PROGRAMS = select_poll_epoll
 select_poll_epoll_SOURCES = select_poll_epoll.c

diff --git a/tests/regression/kernel/test_lttng_logger b/tests/regression/kernel/test_lttng_logger
new file mode 100755 (executable)
index 0000000..b0a53fe
--- /dev/null
+++ b/tests/regression/kernel/test_lttng_logger
@@ -0,0 +1,138 @@
+#!/bin/bash
+#
+# Copyright (C) - 2017 Julien Desfossez <jdesfossez@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.
+
+TEST_DESC="Kernel tracer - lttng-logger"
+
+CURDIR=$(dirname $0)/
+TESTDIR=$CURDIR/../..
+NUM_TESTS=30
+PAYLOAD="test_logger"
+SESSION_NAME="kernel_event_basic"
+
+source $TESTDIR/utils/utils.sh
+
+function test_proc_logger()
+{
+       diag "Test /proc/lttng-logger"
+
+       TRACE_PATH=$(mktemp -d)
+
+       create_lttng_session_ok $SESSION_NAME $TRACE_PATH
+
+       lttng_enable_kernel_event $SESSION_NAME "lttng_logger"
+
+       start_lttng_tracing_ok
+
+       test -e /proc/lttng-logger
+       if test $? = 0; then
+               pass "/proc/lttng-logger exists"
+               echo -n "$PAYLOAD proc" > /proc/lttng-logger
+               ok $? "Write in /proc/lttng-logger"
+       else
+               fail "No /proc/lttng-logger"
+       fi
+
+       stop_lttng_tracing_ok
+
+       validate_trace_count "lttng_logger" $TRACE_PATH 1
+       validate_trace_only_exp "$PAYLOAD" $TRACE_PATH
+
+       destroy_lttng_session_ok $SESSION_NAME
+
+       rm -rf $TRACE_PATH
+}
+
+function test_dev_logger()
+{
+       diag "Test /dev/lttng-logger"
+
+       TRACE_PATH=$(mktemp -d)
+
+       create_lttng_session_ok $SESSION_NAME $TRACE_PATH
+
+       lttng_enable_kernel_event $SESSION_NAME "lttng_logger"
+
+       start_lttng_tracing_ok
+
+       test -c /dev/lttng-logger
+       if test $? = 0; then
+               pass "/dev/lttng-logger is a character device"
+               echo -n "$PAYLOAD dev" > /dev/lttng-logger
+               ok $? "Write in /dev/lttng-logger"
+       else
+               fail "No /dev/lttng-logger"
+       fi
+
+       stop_lttng_tracing_ok
+
+       validate_trace_count "lttng_logger" $TRACE_PATH 1
+       validate_trace_only_exp "$PAYLOAD" $TRACE_PATH
+
+       destroy_lttng_session_ok $SESSION_NAME
+
+       rm -rf $TRACE_PATH
+}
+
+function test_payload_limit()
+{
+       diag "Test lttng-logger payload limit"
+
+       TRACE_PATH=$(mktemp -d)
+
+       create_lttng_session_ok $SESSION_NAME $TRACE_PATH
+
+       lttng_enable_kernel_event $SESSION_NAME "lttng_logger"
+
+       start_lttng_tracing_ok
+
+       # Write 100 times "test_logger", which generates 1200 characters, we expect
+       # the tracer to write 2 events from that string because it limits the
+       # input to 1024 strings.
+       printf "%.s $PAYLOAD" {1..100} > /proc/lttng-logger
+       printf "%.s $PAYLOAD" {1..100} > /dev/lttng-logger
+
+       stop_lttng_tracing_ok
+
+       validate_trace_count "lttng_logger" $TRACE_PATH 4
+       validate_trace_only_exp "$PAYLOAD" $TRACE_PATH
+
+       destroy_lttng_session_ok $SESSION_NAME
+
+       rm -rf $TRACE_PATH
+}
+
+# MUST set TESTDIR before calling those functions
+plan_tests $NUM_TESTS
+
+print_test_banner "$TEST_DESC"
+
+if [ "$(id -u)" == "0" ]; then
+       isroot=1
+else
+       isroot=0
+fi
+
+skip $isroot "Root access is needed. Skipping all tests." $NUM_TESTS ||
+{
+       start_lttng_sessiond
+
+       test_proc_logger
+       test_dev_logger
+       test_payload_limit
+
+       stop_lttng_sessiond
+}

diff --git a/tests/root_regression b/tests/root_regression
index 7639c181c0c4b132a76b4f4e4b54d76b632eca37..f17ac977f82d10d13afb69041fd93e47652d2700 100644 (file)
--- a/tests/root_regression
+++ b/tests/root_regression
@@ -4,6 +4,7 @@ regression/kernel/test_syscall
 regression/kernel/test_clock_override
 regression/kernel/test_rotation_destroy_flush
 regression/kernel/test_select_poll_epoll
+regression/kernel/test_lttng_logger
 regression/tools/live/test_kernel
 regression/tools/live/test_lttng_kernel
 regression/tools/streaming/test_high_throughput_limits

diff --git a/tests/utils/utils.sh b/tests/utils/utils.sh
index 7181e3b88b8e60684a869dd81359dd5786a28981..3a619201f936d3ec3b9ea6a3f81beabcd9570c55 100644 (file)
--- a/tests/utils/utils.sh
+++ b/tests/utils/utils.sh
@@ -1519,7 +1519,7 @@ function validate_trace_only_exp()
        local total=$($BABELTRACE_BIN $trace_path | wc -l)
 
        if [ "$count" -ne 0 ] && [ "$total" -eq "$count" ]; then
-               pass "Trace match with $total for expression '${event_exp}"
+               pass "Trace match with $total for expression '${event_exp}'"
        else
                fail "Trace match"
                diag "$total syscall event(s) found, only syscalls matching expression '${event_exp}' ($count occurrences) are expected"