tests/regression/kernel/test_lttng_logger

   1 #!/bin/bash
   2 #
   3 # Copyright (C) - 2017 Julien Desfossez <jdesfossez@efficios.com>
   4 #
   5 # This program is free software; you can redistribute it and/or modify it
   6 # under the terms of the GNU General Public License, version 2 only, as
   7 # published by the Free Software Foundation.
   8 #
   9 # This program is distributed in the hope that it will be useful, but WITHOUT
  10 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11 # FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12 # more details.
  13 #
  14 # You should have received a copy of the GNU General Public License along with
  15 # this program; if not, write to the Free Software Foundation, Inc., 51
  16 # Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17
  18 TEST_DESC="Kernel tracer - lttng-logger"
  19
  20 CURDIR=$(dirname $0)/
  21 TESTDIR=$CURDIR/../..
  22 NUM_TESTS=30
  23 PAYLOAD="test_logger"
  24 SESSION_NAME="kernel_event_basic"
  25
  26 source $TESTDIR/utils/utils.sh
  27
  28 function test_proc_logger()
  29 {
  30         diag "Test /proc/lttng-logger"
  31
  32         TRACE_PATH=$(mktemp -d)
  33
  34         create_lttng_session_ok $SESSION_NAME $TRACE_PATH
  35
  36         lttng_enable_kernel_event $SESSION_NAME "lttng_logger"
  37
  38         start_lttng_tracing_ok
  39
  40         test -e /proc/lttng-logger
  41         if test $? = 0; then
  42                 pass "/proc/lttng-logger exists"
  43                 echo -n "$PAYLOAD proc" > /proc/lttng-logger
  44                 ok $? "Write in /proc/lttng-logger"
  45         else
  46                 fail "No /proc/lttng-logger"
  47         fi
  48
  49         stop_lttng_tracing_ok
  50
  51         validate_trace_count "lttng_logger" $TRACE_PATH 1
  52         validate_trace_only_exp "$PAYLOAD" $TRACE_PATH
  53
  54         destroy_lttng_session_ok $SESSION_NAME
  55
  56         rm -rf $TRACE_PATH
  57 }
  58
  59 function test_dev_logger()
  60 {
  61         diag "Test /dev/lttng-logger"
  62
  63         TRACE_PATH=$(mktemp -d)
  64
  65         create_lttng_session_ok $SESSION_NAME $TRACE_PATH
  66
  67         lttng_enable_kernel_event $SESSION_NAME "lttng_logger"
  68
  69         start_lttng_tracing_ok
  70
  71         test -c /dev/lttng-logger
  72         if test $? = 0; then
  73                 pass "/dev/lttng-logger is a character device"
  74                 echo -n "$PAYLOAD dev" > /dev/lttng-logger
  75                 ok $? "Write in /dev/lttng-logger"
  76         else
  77                 fail "No /dev/lttng-logger"
  78         fi
  79
  80         stop_lttng_tracing_ok
  81
  82         validate_trace_count "lttng_logger" $TRACE_PATH 1
  83         validate_trace_only_exp "$PAYLOAD" $TRACE_PATH
  84
  85         destroy_lttng_session_ok $SESSION_NAME
  86
  87         rm -rf $TRACE_PATH
  88 }
  89
  90 function test_payload_limit()
  91 {
  92         diag "Test lttng-logger payload limit"
  93
  94         TRACE_PATH=$(mktemp -d)
  95
  96         create_lttng_session_ok $SESSION_NAME $TRACE_PATH
  97
  98         lttng_enable_kernel_event $SESSION_NAME "lttng_logger"
  99
 100         start_lttng_tracing_ok
 101
 102         # Write 100 times "test_logger", which generates 1200 characters, we expect
 103         # the tracer to write 2 events from that string because it limits the
 104         # input to 1024 strings.
 105         printf "%.s $PAYLOAD" {1..100} > /proc/lttng-logger
 106         printf "%.s $PAYLOAD" {1..100} > /dev/lttng-logger
 107
 108         stop_lttng_tracing_ok
 109
 110         validate_trace_count "lttng_logger" $TRACE_PATH 4
 111         validate_trace_only_exp "$PAYLOAD" $TRACE_PATH
 112
 113         destroy_lttng_session_ok $SESSION_NAME
 114
 115         rm -rf $TRACE_PATH
 116 }
 117
 118 # MUST set TESTDIR before calling those functions
 119 plan_tests $NUM_TESTS
 120
 121 print_test_banner "$TEST_DESC"
 122
 123 if [ "$(id -u)" == "0" ]; then
 124         isroot=1
 125 else
 126         isroot=0
 127 fi
 128
 129 skip $isroot "Root access is needed. Skipping all tests." $NUM_TESTS ||
 130 {
 131         start_lttng_sessiond
 132
 133         test_proc_logger
 134         test_dev_logger
 135         test_payload_limit
 136
 137         stop_lttng_sessiond
 138 }