tests/regression/kernel/test_lttng_logger

   1 #!/bin/bash
   2 #
   3 # Copyright (C) 2017 Julien Desfossez <jdesfossez@efficios.com>
   4 #
   5 # SPDX-License-Identifier: GPL-2.0-only
   6 #
   7
   8 TEST_DESC="Kernel tracer - lttng-logger"
   9
  10 CURDIR=$(dirname $0)/
  11 TESTDIR=$CURDIR/../..
  12 NUM_TESTS=30
  13 PAYLOAD="test_logger"
  14 SESSION_NAME="kernel_event_basic"
  15
  16 source $TESTDIR/utils/utils.sh
  17
  18 function test_proc_logger()
  19 {
  20         diag "Test /proc/lttng-logger"
  21
  22         local TRACE_PATH=$(mktemp -d -t "tmp.${FUNCNAME[0]}_trace_path.XXXXXX")
  23
  24         create_lttng_session_ok $SESSION_NAME $TRACE_PATH
  25
  26         lttng_enable_kernel_event $SESSION_NAME "lttng_logger"
  27
  28         start_lttng_tracing_ok
  29
  30         test -e /proc/lttng-logger
  31         if test $? = 0; then
  32                 pass "/proc/lttng-logger exists"
  33                 echo -n "$PAYLOAD proc" > /proc/lttng-logger
  34                 ok $? "Write in /proc/lttng-logger"
  35         else
  36                 fail "No /proc/lttng-logger"
  37         fi
  38
  39         stop_lttng_tracing_ok
  40
  41         validate_trace_count "lttng_logger" $TRACE_PATH 1
  42         validate_trace_only_exp "$PAYLOAD" $TRACE_PATH
  43
  44         destroy_lttng_session_ok $SESSION_NAME
  45
  46         rm -rf $TRACE_PATH
  47 }
  48
  49 function test_dev_logger()
  50 {
  51         diag "Test /dev/lttng-logger"
  52
  53         local TRACE_PATH=$(mktemp -d -t "tmp.${FUNCNAME[0]}_trace_path.XXXXXX")
  54
  55         create_lttng_session_ok $SESSION_NAME $TRACE_PATH
  56
  57         lttng_enable_kernel_event $SESSION_NAME "lttng_logger"
  58
  59         start_lttng_tracing_ok
  60
  61         test -c /dev/lttng-logger
  62         if test $? = 0; then
  63                 pass "/dev/lttng-logger is a character device"
  64                 echo -n "$PAYLOAD dev" > /dev/lttng-logger
  65                 ok $? "Write in /dev/lttng-logger"
  66         else
  67                 fail "No /dev/lttng-logger"
  68         fi
  69
  70         stop_lttng_tracing_ok
  71
  72         validate_trace_count "lttng_logger" $TRACE_PATH 1
  73         validate_trace_only_exp "$PAYLOAD" $TRACE_PATH
  74
  75         destroy_lttng_session_ok $SESSION_NAME
  76
  77         rm -rf $TRACE_PATH
  78 }
  79
  80 function test_payload_limit()
  81 {
  82         diag "Test lttng-logger payload limit"
  83
  84         local TRACE_PATH=$(mktemp -d -t "tmp.${FUNCNAME[0]}_trace_path.XXXXXX")
  85
  86         create_lttng_session_ok $SESSION_NAME $TRACE_PATH
  87
  88         lttng_enable_kernel_event $SESSION_NAME "lttng_logger"
  89
  90         start_lttng_tracing_ok
  91
  92         # Write 100 times "test_logger", which generates 1200 characters, we expect
  93         # the tracer to write 2 events from that string because it limits the
  94         # input to 1024 strings.
  95         printf "%.s $PAYLOAD" {1..100} > /proc/lttng-logger
  96         printf "%.s $PAYLOAD" {1..100} > /dev/lttng-logger
  97
  98         stop_lttng_tracing_ok
  99
 100         validate_trace_count "lttng_logger" $TRACE_PATH 4
 101         validate_trace_only_exp "$PAYLOAD" $TRACE_PATH
 102
 103         destroy_lttng_session_ok $SESSION_NAME
 104
 105         rm -rf $TRACE_PATH
 106 }
 107
 108 # MUST set TESTDIR before calling those functions
 109 plan_tests $NUM_TESTS
 110
 111 print_test_banner "$TEST_DESC"
 112
 113 check_skip_kernel_test "$NUM_TESTS" "Skipping all tests." ||
 114 {
 115         validate_lttng_modules_present
 116         start_lttng_sessiond
 117
 118         test_proc_logger
 119         test_dev_logger
 120         test_payload_limit
 121
 122         stop_lttng_sessiond
 123 }