tests: test kernel snapshot with discard buffers
[lttng-tools.git] / tests / utils / utils.sh
index f44a7376f2a46ae0212a36c3f690447597db1808..da2efe91a72264b93cd5c67b8d46cf28c53408d2 100644 (file)
 # 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
 
 SESSIOND_BIN="lttng-sessiond"
+SESSIOND_MATCH=".*lttng-sess.*"
+SESSIOND_PIDS=""
+RUNAS_BIN="lttng-runas"
+RUNAS_MATCH=".*lttng-runas.*"
 CONSUMERD_BIN="lttng-consumerd"
+CONSUMERD_MATCH=".*lttng-consumerd.*"
 RELAYD_BIN="lttng-relayd"
+RELAYD_MATCH=".*lttng-relayd.*"
+RELAYD_PIDS=""
 LTTNG_BIN="lttng"
 BABELTRACE_BIN="babeltrace"
-OUTPUT_DEST=/dev/null 2>&1
+OUTPUT_DEST=/dev/null
+ERROR_OUTPUT_DEST=/dev/null
 
 # Minimal kernel version supported for session daemon tests
 KERNEL_MAJOR_VERSION=2
@@ -32,8 +40,30 @@ KERNEL_PATCHLEVEL_VERSION=27
 # systems. Specialized tests should test those corner-cases.
 export LTTNG_UST_REGISTER_TIMEOUT=-1
 
+# We set the default lttng-sessiond path to /bin/true to prevent the spawning
+# of a daemonized sessiond. This is necessary since 'lttng create' will spawn
+# its own sessiond if none is running. It also ensures that 'lttng create'
+# fails when no sessiond is running.
+export LTTNG_SESSIOND_PATH="/bin/true"
+
 source $TESTDIR/utils/tap/tap.sh
 
+function full_cleanup ()
+{
+       if [ -n "${SESSIOND_PIDS}" ] || [ -n "${RELAYD_PIDS}" ]; then
+               kill -9 ${SESSIOND_PIDS} ${RELAYD_PIDS} > /dev/null 2>&1
+       fi
+
+       # Disable trap for SIGTERM since the following kill to the
+       # pidgroup will be SIGTERM. Otherwise it loops.
+       # The '-' before the pid number ($$) indicates 'kill' to signal the
+       # whole process group.
+       trap - SIGTERM && kill -- -$$
+}
+
+
+trap full_cleanup SIGINT SIGTERM
+
 function print_ok ()
 {
        # Check if we are a terminal
@@ -81,30 +111,63 @@ function validate_kernel_version ()
 function randstring()
 {
        [ "$2" == "0" ] && CHAR="[:alnum:]" || CHAR="[:graph:]"
-       cat /dev/urandom | tr -cd "$CHAR" | head -c ${1:-16}
+       cat /dev/urandom 2>/dev/null | tr -cd "$CHAR" 2>/dev/null | head -c ${1:-16} 2>/dev/null
        echo
 }
 
-function lttng_enable_kernel_event
+# Return the number of _configured_ CPUs.
+function conf_proc_count()
 {
-       local sess_name=$1
-       local event_name=$2
-       local channel_name=$3
+       getconf _NPROCESSORS_CONF
+       if [ $? -ne 0 ]; then
+               diag "Failed to get the number of configured CPUs"
+       fi
+       echo
+}
 
-       if [ -z $event_name ]; then
+function enable_kernel_lttng_event
+{
+       local expected_to_fail="$1"
+       local sess_name="$2"
+       local event_name="$3"
+       local channel_name="$4"
+
+       if [ -z "$event_name" ]; then
                # Enable all event if no event name specified
                event_name="-a"
        fi
 
-       if [ -z $channel_name ]; then
+       if [ -z "$channel_name" ]; then
                # default channel if none specified
                chan=""
        else
                chan="-c $channel_name"
        fi
 
-       $TESTDIR/../src/bin/lttng/$LTTNG_BIN enable-event "$event_name" $chan -s $sess_name -k >$OUTPUT_DEST
-       ok $? "Enable kernel event $event_name for session $sess_name"
+       $TESTDIR/../src/bin/lttng/$LTTNG_BIN enable-event "$event_name" $chan -s $sess_name -k 1> $OUTPUT_DEST 2> $ERROR_OUTPUT_DEST
+       ret=$?
+       if [[ $expected_to_fail -eq "1" ]]; then
+               test $ret -ne "0"
+               ok $? "Enable kernel event $event_name for session $session_name on channel $channel_name failed as expected"
+       else
+               ok $ret "Enable kernel event $event_name for session $sess_name"
+       fi
+}
+
+function enable_kernel_lttng_event_ok ()
+{
+       enable_kernel_lttng_event 0 "$@"
+}
+
+function enable_kernel_lttng_event_fail ()
+{
+       enable_kernel_lttng_event 1 "$@"
+}
+
+# Old interface
+function lttng_enable_kernel_event
+{
+       enable_kernel_lttng_event_ok "$@"
 }
 
 function lttng_enable_kernel_syscall()
@@ -126,7 +189,7 @@ function lttng_enable_kernel_syscall()
                chan="-c $channel_name"
        fi
 
-       $TESTDIR/../src/bin/lttng/$LTTNG_BIN enable-event --syscall "$syscall_name" $chan -s $sess_name -k >$OUTPUT_DEST
+       $TESTDIR/../src/bin/lttng/$LTTNG_BIN enable-event --syscall "$syscall_name" $chan -s $sess_name -k 1> $OUTPUT_DEST 2> $ERROR_OUTPUT_DEST
        ret=$?
        if [[ $expected_to_fail -eq "1" ]]; then
                test $ret -ne "0"
@@ -138,12 +201,12 @@ function lttng_enable_kernel_syscall()
 
 function lttng_enable_kernel_syscall_ok()
 {
-       lttng_enable_kernel_syscall 0 ${*}
+       lttng_enable_kernel_syscall 0 "$@"
 }
 
 function lttng_enable_kernel_syscall_fail()
 {
-       lttng_enable_kernel_syscall 1 ${*}
+       lttng_enable_kernel_syscall 1 "$@"
 }
 
 function lttng_disable_kernel_syscall()
@@ -165,12 +228,12 @@ function lttng_disable_kernel_syscall()
                chan="-c $channel_name"
        fi
 
-       $TESTDIR/../src/bin/lttng/$LTTNG_BIN disable-event --syscall "$syscall_name" $chan -s $sess_name -k >$OUTPUT_DEST
+       $TESTDIR/../src/bin/lttng/$LTTNG_BIN disable-event --syscall "$syscall_name" $chan -s $sess_name -k 1> $OUTPUT_DEST 2> $ERROR_OUTPUT_DEST
 
        ret=$?
        if [[ $expected_to_fail -eq "1" ]]; then
                test $ret -ne "0"
-               ok $? "Disable kernel syscall $syscall_name for session $sess_name on channel $channel_name fail as expected"
+               ok $? "Disable kernel syscall $syscall_name for session $sess_name on channel $channel_name failed as expected"
        else
                ok $ret "Disable kernel syscall $syscall_name for session $sess_name on channel $channel_name"
        fi
@@ -178,12 +241,12 @@ function lttng_disable_kernel_syscall()
 
 function lttng_disable_kernel_syscall_ok()
 {
-       lttng_disable_kernel_syscall 0 ${*}
+       lttng_disable_kernel_syscall 0 "$@"
 }
 
 function lttng_disable_kernel_syscall_fail()
 {
-       lttng_disable_kernel_syscall 1 ${*}
+       lttng_disable_kernel_syscall 1 "$@"
 }
 
 function lttng_enable_kernel_channel()
@@ -192,11 +255,11 @@ function lttng_enable_kernel_channel()
        local sess_name=$2
        local channel_name=$3
 
-       $TESTDIR/../src/bin/lttng/$LTTNG_BIN enable-channel -k $channel_name -s $sess_name >$OUTPUT_DEST
+       $TESTDIR/../src/bin/lttng/$LTTNG_BIN enable-channel -k $channel_name -s $sess_name 1> $OUTPUT_DEST 2> $ERROR_OUTPUT_DEST
        ret=$?
        if [[ $expected_to_fail -eq "1" ]]; then
                test "$ret" -ne "0"
-               ok $? "Expected failure on kernel channel creation $channel_name in $sess_name"
+               ok $? "Enable channel $channel_name for session $sess_name failed as expected"
        else
                ok $ret "Enable channel $channel_name for session $sess_name"
        fi
@@ -204,12 +267,12 @@ function lttng_enable_kernel_channel()
 
 function lttng_enable_kernel_channel_ok()
 {
-       lttng_enable_kernel_channel 0 ${*}
+       lttng_enable_kernel_channel 0 "$@"
 }
 
 function lttng_enable_kernel_channel_fail()
 {
-       lttng_enable_kernel_channel 1 ${*}
+       lttng_enable_kernel_channel 1 "$@"
 }
 
 function lttng_disable_kernel_channel()
@@ -218,82 +281,109 @@ function lttng_disable_kernel_channel()
        local sess_name=$2
        local channel_name=$3
 
-       $TESTDIR/../src/bin/lttng/$LTTNG_BIN disable-channel -k $channel_name -s $sess_name >$OUTPUT_DEST
+       $TESTDIR/../src/bin/lttng/$LTTNG_BIN disable-channel -k $channel_name -s $sess_name 1> $OUTPUT_DEST 2> $ERROR_OUTPUT_DEST
        ret=$?
        if [[ $expected_to_fail -eq "1" ]]; then
                test "$ret" -ne "0"
-               ok $? "Expected failure on kernel channel creation $channel_name in $sess_name"
+               ok $? "Disable channel $channel_name for session $sess_name failed as expected"
        else
-               ok $ret "disable channel $channel_name for session $sess_name"
+               ok $ret "Disable channel $channel_name for session $sess_name"
        fi
 }
 
 function lttng_disable_kernel_channel_ok()
 {
-       lttng_disable_kernel_channel 0 ${*}
+       lttng_disable_kernel_channel 0 "$@"
 }
 
 function lttng_disable_kernel_channel_fail()
 {
-       lttng_disable_kernel_channel 1 ${*}
+       lttng_disable_kernel_channel 1 "$@"
 }
 
-function start_lttng_relayd
+function start_lttng_relayd_opt()
 {
-       local opt=$1
+       local withtap=$1
+       local opt=$2
 
        DIR=$(readlink -f $TESTDIR)
 
-       if [ -z $(pidof lt-$RELAYD_BIN) ]; then
-               $DIR/../src/bin/lttng-relayd/$RELAYD_BIN -b $opt >$OUTPUT_DEST
+       if [ -z $(pgrep $RELAYD_MATCH) ]; then
+               $DIR/../src/bin/lttng-relayd/$RELAYD_BIN -b $opt 1> $OUTPUT_DEST 2> $ERROR_OUTPUT_DEST
                #$DIR/../src/bin/lttng-relayd/$RELAYD_BIN $opt -vvv >>/tmp/relayd.log 2>&1 &
                if [ $? -eq 1 ]; then
-                       fail "Start lttng-relayd (opt: $opt)"
+                       if [ $withtap -eq "1" ]; then
+                               fail "Start lttng-relayd (opt: $opt)"
+                       fi
                        return 1
                else
-                       pass "Start lttng-relayd (opt: $opt)"
+                       if [ $withtap -eq "1" ]; then
+                               pass "Start lttng-relayd (opt: $opt)"
+                       fi
                fi
        else
                pass "Start lttng-relayd (opt: $opt)"
        fi
+
+       RELAYD_PIDS=$(pgrep $RELAYD_MATCH)
+}
+
+function start_lttng_relayd()
+{
+       start_lttng_relayd_opt 1 "$@"
+}
+
+function start_lttng_relayd_notap()
+{
+       start_lttng_relayd_opt 0 "$@"
 }
 
-function stop_lttng_relayd_nocheck
+function stop_lttng_relayd_opt()
 {
-       PID_RELAYD=`pidof lt-$RELAYD_BIN`
+       local withtap=$1
 
-       diag "Killing lttng-relayd (pid: $PID_RELAYD)"
-       kill $PID_RELAYD >$OUTPUT_DEST
+       if [ $withtap -eq "1" ]; then
+               diag "Killing lttng-relayd (pid: $RELAYD_PIDS)"
+       fi
+       kill $RELAYD_PIDS 1> $OUTPUT_DEST 2> $ERROR_OUTPUT_DEST
        retval=$?
 
-       if [ $retval -eq 1 ]; then
+       if [ $? -eq 1 ]; then
+               if [ $withtap -eq "1" ]; then
+                       fail "Kill relay daemon"
+               fi
+               return 1
+       else
                out=1
                while [ -n "$out" ]; do
-                       out=$(pidof lt-$RELAYD_BIN)
+                       out=$(pgrep $RELAYD_MATCH)
                        sleep 0.5
                done
+               if [ $withtap -eq "1" ]; then
+                       pass "Kill relay daemon"
+               fi
        fi
+       RELAYD_PIDS=""
        return $retval
 }
 
-function stop_lttng_relayd
+function stop_lttng_relayd()
 {
-       stop_lttng_relayd_nocheck
+       stop_lttng_relayd_opt 1 "$@"
+}
 
-       if [ $? -eq 1 ]; then
-               fail "Killed lttng-relayd (pid: $PID_RELAYD)"
-               return 1
-       else
-               pass "Killed lttng-relayd (pid: $PID_RELAYD)"
-               return 0
-       fi
+function stop_lttng_relayd_notap()
+{
+       stop_lttng_relayd_opt 0 "$@"
 }
 
-#First argument: load path for automatic loading
-function start_lttng_sessiond()
+#First arg: show tap output
+#Second argument: load path for automatic loading
+function start_lttng_sessiond_opt()
 {
+       local withtap=$1
+       local load_path=$2
 
-       local load_path="$1"
        if [ -n $TEST_NO_SESSIOND ] && [ "$TEST_NO_SESSIOND" == "1" ]; then
                # Env variable requested no session daemon
                return
@@ -309,52 +399,258 @@ function start_lttng_sessiond()
        : ${LTTNG_SESSION_CONFIG_XSD_PATH=${DIR}/../src/common/config/}
        export LTTNG_SESSION_CONFIG_XSD_PATH
 
-       if [ -z $(pidof lt-$SESSIOND_BIN) ]; then
+       if [ -z $(pgrep ${SESSIOND_MATCH}) ]; then
                # Have a load path ?
-               if [ -n "$1" ]; then
-                       $DIR/../src/bin/lttng-sessiond/$SESSIOND_BIN --load "$1" --background --consumerd32-path="$DIR/../src/bin/lttng-consumerd/lttng-consumerd" --consumerd64-path="$DIR/../src/bin/lttng-consumerd/lttng-consumerd"
+               if [ -n "$load_path" ]; then
+                       $DIR/../src/bin/lttng-sessiond/$SESSIOND_BIN --load "$load_path" --background --consumerd32-path="$DIR/../src/bin/lttng-consumerd/lttng-consumerd" --consumerd64-path="$DIR/../src/bin/lttng-consumerd/lttng-consumerd"
                else
                        $DIR/../src/bin/lttng-sessiond/$SESSIOND_BIN --background --consumerd32-path="$DIR/../src/bin/lttng-consumerd/lttng-consumerd" --consumerd64-path="$DIR/../src/bin/lttng-consumerd/lttng-consumerd"
                fi
                #$DIR/../src/bin/lttng-sessiond/$SESSIOND_BIN --background --consumerd32-path="$DIR/../src/bin/lttng-consumerd/lttng-consumerd" --consumerd64-path="$DIR/../src/bin/lttng-consumerd/lttng-consumerd" --verbose-consumer >>/tmp/sessiond.log 2>&1
                status=$?
-               ok $status "Start session daemon"
+               if [ $withtap -eq "1" ]; then
+                       ok $status "Start session daemon"
+               fi
        fi
+       SESSIOND_PIDS=$(pgrep $SESSIOND_MATCH)
+}
+
+function start_lttng_sessiond()
+{
+       start_lttng_sessiond_opt 1 "$@"
+}
+
+function start_lttng_sessiond_notap()
+{
+       start_lttng_sessiond_opt 0 "$@"
 }
 
-function stop_lttng_sessiond ()
+function stop_lttng_sessiond_opt()
 {
+       local withtap=$1
+       local signal=$2
+       local kill_opt=""
+
        if [ -n $TEST_NO_SESSIOND ] && [ "$TEST_NO_SESSIOND" == "1" ]; then
                # Env variable requested no session daemon
                return
        fi
 
-       PID_SESSIOND=`pidof lt-$SESSIOND_BIN`
+       local pids="${SESSIOND_PIDS} $(pgrep $RUNAS_MATCH)"
 
-       kill $PID_SESSIOND >$OUTPUT_DEST
+       if [ -n "$2" ]; then
+               kill_opt="$kill_opt -s $signal"
+       fi
+       if [ $withtap -eq "1" ]; then
+               diag "Killing $SESSIOND_BIN and lt-$SESSIOND_BIN pids: $(echo $pids | tr '\n' ' ')"
+       fi
+       kill $kill_opt $pids 1> $OUTPUT_DEST 2> $ERROR_OUTPUT_DEST
 
        if [ $? -eq 1 ]; then
-               fail "Kill sessions daemon"
-               return 1
+               if [ $withtap -eq "1" ]; then
+                       fail "Kill sessions daemon"
+               fi
        else
                out=1
                while [ -n "$out" ]; do
-                       out=$(pidof lt-$SESSIOND_BIN)
+                       out=$(pgrep ${SESSIOND_MATCH})
                        sleep 0.5
                done
                out=1
                while [ -n "$out" ]; do
-                       out=$(pidof $CONSUMERD_BIN)
+                       out=$(pgrep $CONSUMERD_MATCH)
+                       sleep 0.5
+               done
+
+               SESSIOND_PIDS=""
+               if [ $withtap -eq "1" ]; then
+                       pass "Kill session daemon"
+               fi
+       fi
+}
+
+function stop_lttng_sessiond()
+{
+       stop_lttng_sessiond_opt 1 "$@"
+}
+
+function stop_lttng_sessiond_notap()
+{
+       stop_lttng_sessiond_opt 0 "$@"
+}
+
+function sigstop_lttng_sessiond_opt()
+{
+       local withtap=$1
+       local signal=SIGSTOP
+       local kill_opt=""
+
+       if [ -n $TEST_NO_SESSIOND ] && [ "$TEST_NO_SESSIOND" == "1" ]; then
+               # Env variable requested no session daemon
+               return
+       fi
+
+       PID_SESSIOND="$(pgrep ${SESSIOND_MATCH}) $(pgrep $RUNAS_MATCH)"
+
+       kill_opt="$kill_opt -s $signal"
+
+       if [ $withtap -eq "1" ]; then
+               diag "Sending SIGSTOP to lt-$SESSIOND_BIN and $SESSIOND_BIN pids: $(echo $PID_SESSIOND | tr '\n' ' ')"
+       fi
+       kill $kill_opt $PID_SESSIOND 1> $OUTPUT_DEST 2> $ERROR_OUTPUT_DEST
+
+       if [ $? -eq 1 ]; then
+               if [ $withtap -eq "1" ]; then
+                       fail "Sending SIGSTOP to session daemon"
+               fi
+       else
+               out=1
+               while [ $out -ne 0 ]; do
+                       pid=$(pgrep $SESSIOND_MATCH)
+
+                       # Wait until state becomes stopped for session
+                       # daemon(s).
+                       out=0
+                       for sessiond_pid in $pid; do
+                               state=$(ps -p $sessiond_pid -o state= )
+                               if [[ -n "$state" && "$state" != "T" ]]; then
+                                       out=1
+                               fi
+                       done
+                       sleep 0.5
+               done
+               if [ $withtap -eq "1" ]; then
+                       pass "Sending SIGSTOP to session daemon"
+               fi
+       fi
+}
+
+function sigstop_lttng_sessiond()
+{
+       sigstop_lttng_sessiond_opt 1 "$@"
+}
+
+function sigstop_lttng_sessiond_notap()
+{
+       sigstop_lttng_sessiond_opt 0 "$@"
+}
+
+function stop_lttng_consumerd_opt()
+{
+       local withtap=$1
+       local signal=$2
+       local kill_opt=""
+
+       PID_CONSUMERD=$(pgrep $CONSUMERD_MATCH)
+
+       if [ -n "$2" ]; then
+               kill_opt="$kill_opt -s $signal"
+       fi
+
+       if [ $withtap -eq "1" ]; then
+               diag "Killing $CONSUMERD_BIN pids: $(echo $PID_CONSUMERD | tr '\n' ' ')"
+       fi
+       kill $kill_opt $PID_CONSUMERD 1> $OUTPUT_DEST 2> $ERROR_OUTPUT_DEST
+       retval=$?
+       set +x
+
+       if [ $? -eq 1 ]; then
+               if [ $withtap -eq "1" ]; then
+                       fail "Kill consumer daemon"
+               fi
+               return 1
+       else
+               out=1
+               while [ $out -ne 0 ]; do
+                       pid=$(pgrep $CONSUMERD_MATCH)
+
+                       # If consumerds are still present check their status.
+                       # A zombie status qualifies the consumerd as *killed*
+                       out=0
+                       for consumer_pid in $pid; do
+                               state=$(ps -p $consumer_pid -o state= )
+                               if [[ -n "$state" && "$state" != "Z" ]]; then
+                                       out=1
+                               fi
+                       done
                        sleep 0.5
                done
-               pass "Kill session daemon"
+               if [ $withtap -eq "1" ]; then
+                       pass "Kill consumer daemon"
+               fi
+       fi
+       return $retval
+}
+
+function stop_lttng_consumerd()
+{
+       stop_lttng_consumerd_opt 1 "$@"
+}
+
+function stop_lttng_consumerd_notap()
+{
+       stop_lttng_consumerd_opt 0 "$@"
+}
+
+function sigstop_lttng_consumerd_opt()
+{
+       local withtap=$1
+       local signal=SIGSTOP
+       local kill_opt=""
+
+       PID_CONSUMERD=$(pgrep $CONSUMERD_MATCH)
+
+       kill_opt="$kill_opt -s $signal"
+
+       if [ $withtap -eq "1" ]; then
+               diag "Sending SIGSTOP to $CONSUMERD_BIN pids: $(echo $PID_CONSUMERD | tr '\n' ' ')"
+       fi
+       kill $kill_opt $PID_CONSUMERD 1> $OUTPUT_DEST 2> $ERROR_OUTPUT_DEST
+       retval=$?
+       set +x
+
+       if [ $? -eq 1 ]; then
+               if [ $withtap -eq "1" ]; then
+                       fail "Sending SIGSTOP to consumer daemon"
+               fi
+               return 1
+       else
+               out=1
+               while [ $out -ne 0 ]; do
+                       pid=$(pgrep $CONSUMERD_MATCH)
+
+                       # Wait until state becomes stopped for all
+                       # consumers.
+                       out=0
+                       for consumer_pid in $pid; do
+                               state=$(ps -p $consumer_pid -o state= )
+                               if [[ -n "$state" && "$state" != "T" ]]; then
+                                       out=1
+                               fi
+                       done
+                       sleep 0.5
+               done
+               if [ $withtap -eq "1" ]; then
+                       pass "Sending SIGSTOP to consumer daemon"
+               fi
        fi
+       return $retval
+}
+
+function sigstop_lttng_consumerd()
+{
+       sigstop_lttng_consumerd_opt 1 "$@"
+}
+
+function sigstop_lttng_consumerd_notap()
+{
+       sigstop_lttng_consumerd_opt 0 "$@"
 }
 
 function list_lttng_with_opts ()
 {
        local opts=$1
-       $TESTDIR/../src/bin/lttng/$LTTNG_BIN list $opts >$OUTPUT_DEST
+       $TESTDIR/../src/bin/lttng/$LTTNG_BIN list $opts 1> $OUTPUT_DEST 2> $ERROR_OUTPUT_DEST
        ok $? "Lttng-tool list command with option $opts"
 }
 
@@ -362,7 +658,7 @@ function create_lttng_session_no_output ()
 {
        local sess_name=$1
 
-       $TESTDIR/../src/bin/lttng/$LTTNG_BIN create $sess_name --no-output >$OUTPUT_DEST
+       $TESTDIR/../src/bin/lttng/$LTTNG_BIN create $sess_name --no-output 1> $OUTPUT_DEST 2> $ERROR_OUTPUT_DEST
        ok $? "Create session $sess_name in no-output mode"
 }
 
@@ -371,12 +667,13 @@ function create_lttng_session ()
        local expected_to_fail=$1
        local sess_name=$2
        local trace_path=$3
+       local opt=$4
 
-       $TESTDIR/../src/bin/lttng/$LTTNG_BIN create $sess_name -o $trace_path > $OUTPUT_DEST
+       $TESTDIR/../src/bin/lttng/$LTTNG_BIN create $sess_name -o $trace_path $opt > $OUTPUT_DEST
        ret=$?
        if [[ $expected_to_fail -eq "1" ]]; then
                test "$ret" -ne "0"
-               ok $? "Expected fail on session creation $sess_name in $trace_path"
+               ok $? "Create session $sess_name in $trace_path failed as expected"
        else
                ok $ret "Create session $sess_name in $trace_path"
        fi
@@ -395,15 +692,16 @@ function create_lttng_session_fail ()
 
 function enable_ust_lttng_channel ()
 {
-       local expect_fail=$1
+       local expected_to_fail=$1
        local sess_name=$2
        local channel_name=$3
+       local opt=$4
 
-       $TESTDIR/../src/bin/lttng/$LTTNG_BIN enable-channel -u $channel_name -s $sess_name >$OUTPUT_DEST
+       $TESTDIR/../src/bin/lttng/$LTTNG_BIN enable-channel -u $channel_name -s $sess_name $opt 1> $OUTPUT_DEST 2> $ERROR_OUTPUT_DEST
        ret=$?
-       if [[ $expect_fail -eq "1" ]]; then
+       if [[ $expected_to_fail -eq "1" ]]; then
                test "$ret" -ne "0"
-               ok $? "Expected fail on ust channel creation $channel_name in $sess_name"
+               ok $? "Enable channel $channel_name for session $sess_name failed as expected"
        else
                ok $ret "Enable channel $channel_name for session $sess_name"
        fi
@@ -424,7 +722,7 @@ function disable_ust_lttng_channel()
        local sess_name=$1
        local channel_name=$2
 
-       $TESTDIR/../src/bin/lttng/$LTTNG_BIN disable-channel -u $channel_name -s $sess_name >$OUTPUT_DEST
+       $TESTDIR/../src/bin/lttng/$LTTNG_BIN disable-channel -u $channel_name -s $sess_name 1> $OUTPUT_DEST 2> $ERROR_OUTPUT_DEST
        ok $? "Disable channel $channel_name for session $sess_name"
 }
 
@@ -433,25 +731,43 @@ function enable_lttng_mmap_overwrite_kernel_channel()
        local sess_name=$1
        local channel_name=$2
 
-       $TESTDIR/../src/bin/lttng/$LTTNG_BIN enable-channel -s $sess_name $channel_name -k --output mmap --overwrite >$OUTPUT_DEST
+       $TESTDIR/../src/bin/lttng/$LTTNG_BIN enable-channel -s $sess_name $channel_name -k --output mmap --overwrite 1> $OUTPUT_DEST 2> $ERROR_OUTPUT_DEST
        ok $? "Enable channel $channel_name for session $sess_name"
 }
 
+function enable_lttng_mmap_discard_small_kernel_channel()
+{
+       local sess_name=$1
+       local channel_name=$2
+
+       $TESTDIR/../src/bin/lttng/$LTTNG_BIN enable-channel -s $sess_name $channel_name -k --output mmap --discard --subbuf-size=$(getconf PAGE_SIZE) --num-subbuf=2 1> $OUTPUT_DEST 2> $ERROR_OUTPUT_DEST
+       ok $? "Enable small discard channel $channel_name for session $sess_name"
+}
+
+function enable_lttng_mmap_overwrite_small_kernel_channel()
+{
+       local sess_name=$1
+       local channel_name=$2
+
+       $TESTDIR/../src/bin/lttng/$LTTNG_BIN enable-channel -s $sess_name $channel_name -k --output mmap --overwrite --subbuf-size=$(getconf PAGE_SIZE) --num-subbuf=2 1> $OUTPUT_DEST 2> $ERROR_OUTPUT_DEST
+       ok $? "Enable small discard channel $channel_name for session $sess_name"
+}
+
 function enable_lttng_mmap_overwrite_ust_channel()
 {
        local sess_name=$1
        local channel_name=$2
 
-       $TESTDIR/../src/bin/lttng/$LTTNG_BIN enable-channel -s $sess_name $channel_name -u --output mmap --overwrite >$OUTPUT_DEST
+       $TESTDIR/../src/bin/lttng/$LTTNG_BIN enable-channel -s $sess_name $channel_name -u --output mmap --overwrite 1> $OUTPUT_DEST 2> $ERROR_OUTPUT_DEST
        ok $? "Enable channel $channel_name for session $sess_name"
 }
 
 function enable_ust_lttng_event ()
 {
-       local sess_name=$1
-       local event_name="$2"
-       local channel_name=$3
-       local expected_to_fail=$4
+       local expected_to_fail=$1
+       local sess_name=$2
+       local event_name="$3"
+       local channel_name=$4
 
        if [ -z $channel_name ]; then
                # default channel if none specified
@@ -460,16 +776,26 @@ function enable_ust_lttng_event ()
                chan="-c $channel_name"
        fi
 
-       $TESTDIR/../src/bin/lttng/$LTTNG_BIN enable-event "$event_name" $chan -s $sess_name -u >$OUTPUT_DEST
+       $TESTDIR/../src/bin/lttng/$LTTNG_BIN enable-event "$event_name" $chan -s $sess_name -u 1> $OUTPUT_DEST 2> $ERROR_OUTPUT_DEST
        ret=$?
-       if [[ $expected_to_fail ]]; then
+       if [[ $expected_to_fail -eq "1" ]]; then
                test $ret -ne "0"
-               ok $? "Enable ust event $event_name for session $session_name on channel $channel_name failed as expected"
+               ok $? "Enable ust event $event_name for session $session_name failed as expected"
        else
-               ok $ret "Enable event $event_name for session $sess_name"
+               ok $ret "Enable ust event $event_name for session $sess_name"
        fi
 }
 
+function enable_ust_lttng_event_ok ()
+{
+       enable_ust_lttng_event 0 "$@"
+}
+
+function enable_ust_lttng_event_fail ()
+{
+       enable_ust_lttng_event 1 "$@"
+}
+
 function enable_jul_lttng_event()
 {
        sess_name=$1
@@ -483,7 +809,7 @@ function enable_jul_lttng_event()
                chan="-c $channel_name"
        fi
 
-       $TESTDIR/../src/bin/lttng/$LTTNG_BIN enable-event "$event_name" $chan -s $sess_name -j >$OUTPUT_DEST
+       $TESTDIR/../src/bin/lttng/$LTTNG_BIN enable-event "$event_name" $chan -s $sess_name -j 1> $OUTPUT_DEST 2> $ERROR_OUTPUT_DEST
        ok $? "Enable JUL event $event_name for session $sess_name"
 }
 
@@ -501,7 +827,7 @@ function enable_jul_lttng_event_loglevel()
                chan="-c $channel_name"
        fi
 
-       $TESTDIR/../src/bin/lttng/$LTTNG_BIN enable-event --loglevel $loglevel "$event_name" $chan -s $sess_name -j >$OUTPUT_DEST
+       $TESTDIR/../src/bin/lttng/$LTTNG_BIN enable-event --loglevel $loglevel "$event_name" $chan -s $sess_name -j 1> $OUTPUT_DEST 2> $ERROR_OUTPUT_DEST
        ok $? "Enable JUL event $event_name for session $sess_name with loglevel $loglevel"
 }
 
@@ -518,7 +844,7 @@ function enable_log4j_lttng_event()
                chan="-c $channel_name"
        fi
 
-       $TESTDIR/../src/bin/lttng/$LTTNG_BIN enable-event "$event_name" $chan -s $sess_name -l >$OUTPUT_DEST
+       $TESTDIR/../src/bin/lttng/$LTTNG_BIN enable-event "$event_name" $chan -s $sess_name -l 1> $OUTPUT_DEST 2> $ERROR_OUTPUT_DEST
        ok $? "Enable LOG4J event $event_name for session $sess_name"
 }
 
@@ -536,7 +862,7 @@ function enable_log4j_lttng_event_loglevel()
                chan="-c $channel_name"
        fi
 
-       $TESTDIR/../src/bin/lttng/$LTTNG_BIN enable-event --loglevel $loglevel "$event_name" $chan -s $sess_name -l >$OUTPUT_DEST
+       $TESTDIR/../src/bin/lttng/$LTTNG_BIN enable-event --loglevel $loglevel "$event_name" $chan -s $sess_name -l 1> $OUTPUT_DEST 2> $ERROR_OUTPUT_DEST
        ok $? "Enable LOG4J event $event_name for session $sess_name with loglevel $loglevel"
 }
 
@@ -553,7 +879,7 @@ function enable_python_lttng_event()
                chan="-c $channel_name"
        fi
 
-       $TESTDIR/../src/bin/lttng/$LTTNG_BIN enable-event "$event_name" $chan -s $sess_name -p >$OUTPUT_DEST
+       $TESTDIR/../src/bin/lttng/$LTTNG_BIN enable-event "$event_name" $chan -s $sess_name -p 1> $OUTPUT_DEST 2> $ERROR_OUTPUT_DEST
        ok $? "Enable Python event $event_name for session $sess_name"
 }
 
@@ -571,7 +897,7 @@ function enable_python_lttng_event_loglevel()
                chan="-c $channel_name"
        fi
 
-       $TESTDIR/../src/bin/lttng/$LTTNG_BIN enable-event --loglevel $loglevel "$event_name" $chan -s $sess_name -p >$OUTPUT_DEST
+       $TESTDIR/../src/bin/lttng/$LTTNG_BIN enable-event --loglevel $loglevel "$event_name" $chan -s $sess_name -p 1> $OUTPUT_DEST 2> $ERROR_OUTPUT_DEST
        ok $? "Enable Python event $event_name for session $sess_name with loglevel $loglevel"
 }
 
@@ -581,7 +907,7 @@ function enable_ust_lttng_event_filter()
        local event_name="$2"
        local filter="$3"
 
-       $TESTDIR/../src/bin/lttng/$LTTNG_BIN enable-event "$event_name" -s $sess_name -u --filter "$filter" >$OUTPUT_DEST
+       $TESTDIR/../src/bin/lttng/$LTTNG_BIN enable-event "$event_name" -s $sess_name -u --filter "$filter" 1> $OUTPUT_DEST 2> $ERROR_OUTPUT_DEST
        ok $? "Enable event $event_name with filtering for session $sess_name"
 }
 
@@ -591,7 +917,7 @@ function enable_ust_lttng_event_loglevel()
        local event_name="$2"
        local loglevel="$3"
 
-       $TESTDIR/../src/bin/lttng/$LTTNG_BIN enable-event "$event_name" -s $sess_name -u --loglevel $loglevel >$OUTPUT_DEST
+       $TESTDIR/../src/bin/lttng/$LTTNG_BIN enable-event "$event_name" -s $sess_name -u --loglevel $loglevel 1> $OUTPUT_DEST 2> $ERROR_OUTPUT_DEST
        ok $? "Enable event $event_name with loglevel $loglevel"
 }
 
@@ -601,7 +927,7 @@ function enable_ust_lttng_event_loglevel_only()
        local event_name="$2"
        local loglevel="$3"
 
-       $TESTDIR/../src/bin/lttng/$LTTNG_BIN enable-event "$event_name" -s $sess_name -u --loglevel-only $loglevel >$OUTPUT_DEST
+       $TESTDIR/../src/bin/lttng/$LTTNG_BIN enable-event "$event_name" -s $sess_name -u --loglevel-only $loglevel 1> $OUTPUT_DEST 2> $ERROR_OUTPUT_DEST
        ok $? "Enable event $event_name with loglevel-only $loglevel"
 }
 
@@ -618,7 +944,7 @@ function disable_ust_lttng_event ()
                chan="-c $channel_name"
        fi
 
-       $TESTDIR/../src/bin/lttng/$LTTNG_BIN disable-event "$event_name" -s $sess_name $chan -u >$OUTPUT_DEST
+       $TESTDIR/../src/bin/lttng/$LTTNG_BIN disable-event "$event_name" -s $sess_name $chan -u 1> $OUTPUT_DEST 2> $ERROR_OUTPUT_DEST
        ok $? "Disable event $event_name for session $sess_name"
 }
 
@@ -645,106 +971,158 @@ function disable_python_lttng_event ()
        local sess_name="$1"
        local event_name="$2"
 
-       $TESTDIR/../src/bin/lttng/$LTTNG_BIN disable-event "$event_name" -s $sess_name -p >$OUTPUT_DEST
+       $TESTDIR/../src/bin/lttng/$LTTNG_BIN disable-event "$event_name" -s $sess_name -p 1> $OUTPUT_DEST 2> $ERROR_OUTPUT_DEST
        ok $? "Disable Python event $event_name for session $sess_name"
 }
 
 function start_lttng_tracing ()
 {
-       local sess_name=$1
-       local expected_to_fail=$2
+       local expected_to_fail=$1
+       local sess_name=$2
 
-       $TESTDIR/../src/bin/lttng/$LTTNG_BIN start $sess_name >$OUTPUT_DEST
+       $TESTDIR/../src/bin/lttng/$LTTNG_BIN start $sess_name 1> $OUTPUT_DEST 2> $ERROR_OUTPUT_DEST
        ret=$?
-       if [[ $expected_to_fail ]]; then
+       if [[ $expected_to_fail -eq "1" ]]; then
                test "$ret" -ne "0"
-               ok $? "Expected fail on start tracing for session: $sess_name"
+               ok $? "Start tracing for session $sess_name failed as expected"
        else
                ok $ret "Start tracing for session $sess_name"
        fi
 }
 
+function start_lttng_tracing_ok ()
+{
+       start_lttng_tracing 0 "$@"
+}
+
+function start_lttng_tracing_fail ()
+{
+       start_lttng_tracing 1 "$@"
+}
+
 function stop_lttng_tracing ()
 {
-       local sess_name=$1
-       local expected_to_fail=$2
+       local expected_to_fail=$1
+       local sess_name=$2
 
-       $TESTDIR/../src/bin/lttng/$LTTNG_BIN stop $sess_name >$OUTPUT_DEST
+       $TESTDIR/../src/bin/lttng/$LTTNG_BIN stop $sess_name 1> $OUTPUT_DEST 2> $ERROR_OUTPUT_DEST
        ret=$?
-       if [[ $expected_to_fail ]]; then
+       if [[ $expected_to_fail -eq "1" ]]; then
                test "$ret" -ne "0"
-               ok $? "Expected fail on stop tracing for session: $sess_name"
+               ok $? "Stop lttng tracing for session $sess_name failed as expected"
        else
                ok $ret "Stop lttng tracing for session $sess_name"
        fi
 }
 
+function stop_lttng_tracing_ok ()
+{
+       stop_lttng_tracing 0 "$@"
+}
+
+function stop_lttng_tracing_fail ()
+{
+       stop_lttng_tracing 1 "$@"
+}
+
 function destroy_lttng_session ()
 {
-       local sess_name=$1
-       local expected_to_fail=$2
+       local expected_to_fail=$1
+       local sess_name=$2
 
-       $TESTDIR/../src/bin/lttng/$LTTNG_BIN destroy $sess_name >$OUTPUT_DEST
+       $TESTDIR/../src/bin/lttng/$LTTNG_BIN destroy $sess_name 1> $OUTPUT_DEST 2> $ERROR_OUTPUT_DEST
        ret=$?
-       if [[ $expected_to_fail ]]; then
+       if [[ $expected_to_fail -eq "1" ]]; then
                test "$ret" -ne "0"
-               ok $? "Expected fail on session deletion $sess_name"
+               ok $? "Destroy session $sess_name failed as expected"
        else
                ok $ret "Destroy session $sess_name"
        fi
 }
 
+function destroy_lttng_session_ok ()
+{
+       destroy_lttng_session 0 "$@"
+
+}
+
+function destroy_lttng_session_fail ()
+{
+       destroy_lttng_session 1 "$@"
+}
+
+
 function destroy_lttng_sessions ()
 {
-       $TESTDIR/../src/bin/lttng/$LTTNG_BIN destroy --all >$OUTPUT_DEST
+       $TESTDIR/../src/bin/lttng/$LTTNG_BIN destroy --all 1> $OUTPUT_DEST 2> $ERROR_OUTPUT_DEST
        ok $? "Destroy all lttng sessions"
 }
 
 function lttng_snapshot_add_output ()
 {
-       local sess_name=$1
-       local trace_path=$2
-       local expected_to_fail=$3
+       local expected_to_fail=$1
+       local sess_name=$2
+       local trace_path=$3
 
-       $TESTDIR/../src/bin/lttng/$LTTNG_BIN snapshot add-output -s $sess_name file://$trace_path >$OUTPUT_DEST
+       $TESTDIR/../src/bin/lttng/$LTTNG_BIN snapshot add-output -s $sess_name file://$trace_path 1> $OUTPUT_DEST 2> $ERROR_OUTPUT_DEST
        ret=$?
-       if [[ $expected_to_fail ]]; then
+       if [[ $expected_to_fail -eq 1 ]]; then
                test "$ret" -ne "0"
-               ok $? "Failed to add a  snapshot output file://$trace_path as expected"
+               ok $? "Added snapshot output file://$trace_path failed as expected"
        else
                ok $ret "Added snapshot output file://$trace_path"
        fi
 }
 
+function lttng_snapshot_add_output_ok ()
+{
+       lttng_snapshot_add_output 0 "$@"
+}
+
+function lttng_snapshot_add_output_fail ()
+{
+       lttng_snapshot_add_output 1 "$@"
+}
+
 function lttng_snapshot_del_output ()
 {
-       local sess_name=$1
-       local id=$2
-       local expected_to_fail=$3
+       local expected_to_fail=$1
+       local sess_name=$2
+       local id=$3
 
-       $TESTDIR/../src/bin/lttng/$LTTNG_BIN snapshot del-output -s $sess_name $id >$OUTPUT_DEST
+       $TESTDIR/../src/bin/lttng/$LTTNG_BIN snapshot del-output -s $sess_name $id 1> $OUTPUT_DEST 2> $ERROR_OUTPUT_DEST
        ret=$?
-       if [[ $expected_to_fail ]]; then
+       if [[ $expected_to_fail -eq "1" ]]; then
                test "$ret" -ne "0"
-               ok $? "Expect fail on deletion of snapshot output id $id"
+               ok $? "Deleted snapshot output id $id failed as expected"
        else
                ok $ret "Deleted snapshot output id $id"
        fi
 }
 
+function lttng_snapshot_del_output_ok ()
+{
+       lttng_snapshot_del_output 0 "$@"
+}
+
+function lttng_snapshot_del_output_fail ()
+{
+       lttng_snapshot_del_output 1 "$@"
+}
+
 function lttng_snapshot_record ()
 {
        local sess_name=$1
        local trace_path=$2
 
-       $TESTDIR/../src/bin/lttng/$LTTNG_BIN snapshot record -s $sess_name >$OUTPUT_DEST
+       $TESTDIR/../src/bin/lttng/$LTTNG_BIN snapshot record -s $sess_name 1> $OUTPUT_DEST 2> $ERROR_OUTPUT_DEST
        ok $? "Snapshot recorded"
 }
 
 function lttng_snapshot_list ()
 {
        local sess_name=$1
-       $TESTDIR/../src/bin/lttng/$LTTNG_BIN snapshot list-output -s $sess_name >$OUTPUT_DEST
+       $TESTDIR/../src/bin/lttng/$LTTNG_BIN snapshot list-output -s $sess_name 1> $OUTPUT_DEST 2> $ERROR_OUTPUT_DEST
        ok $? "Snapshot list"
 }
 
@@ -753,16 +1131,102 @@ function lttng_save()
        local sess_name=$1
        local opts=$2
 
-       $TESTDIR/../src/bin/lttng/$LTTNG_BIN save $sess_name $opts >$OUTPUT_DEST
-       ok $? "Session successfully saved"
+       $TESTDIR/../src/bin/lttng/$LTTNG_BIN save $sess_name $opts 1> $OUTPUT_DEST 2> $ERROR_OUTPUT_DEST
+       ok $? "Session saved"
 }
 
 function lttng_load()
 {
        local opts=$1
 
-       $TESTDIR/../src/bin/lttng/$LTTNG_BIN load $opts >$OUTPUT_DEST
-       ok $? "Load command successful"
+       $TESTDIR/../src/bin/lttng/$LTTNG_BIN load $opts 1> $OUTPUT_DEST 2> $ERROR_OUTPUT_DEST
+       ok $? "Load command with opts: $opts"
+}
+
+function lttng_track()
+{
+       local expected_to_fail=$1
+       local opts=$2
+       $TESTDIR/../src/bin/lttng/$LTTNG_BIN track $opts >$OUTPUT_DEST
+       ret=$?
+       if [[ $expected_to_fail -eq "1" ]]; then
+               test $ret -ne "0"
+               ok $? "Track command failed as expected with opts: $opts"
+       else
+               ok $ret "Track command with opts: $opts"
+       fi
+}
+
+function lttng_track_ok()
+{
+       lttng_track 0 "$@"
+}
+
+function lttng_track_fail()
+{
+       lttng_track 1 "$@"
+}
+
+function lttng_untrack()
+{
+       local expected_to_fail=$1
+       local opts=$2
+       $TESTDIR/../src/bin/lttng/$LTTNG_BIN untrack $opts >$OUTPUT_DEST
+       ret=$?
+       if [[ $expected_to_fail -eq "1" ]]; then
+               test $ret -ne "0"
+               ok $? "Untrack command failed as expected with opts: $opts"
+       else
+               ok $ret "Untrack command with opts: $opts"
+       fi
+}
+
+function lttng_untrack_ok()
+{
+       lttng_untrack 0 "$@"
+}
+
+function lttng_untrack_fail()
+{
+       lttng_untrack 1 "$@"
+}
+
+function add_context_lttng()
+{
+       local expected_to_fail="$1"
+       local domain="$2"
+       local session_name="$3"
+       local channel_name="$4"
+       local type="$5"
+
+       $TESTDIR/../src/bin/lttng/$LTTNG_BIN add-context -s $session_name -c $channel_name -t $type $domain  1> $OUTPUT_DEST 2> $ERROR_OUTPUT_DEST
+       ret=$?
+       if [[ $expected_to_fail -eq "1" ]]; then
+               test $ret -ne "0"
+               ok $? "Add context command failed as expected for type: $type"
+       else
+               ok $ret "Add context command for type: $type"
+       fi
+}
+
+function add_context_ust_ok()
+{
+       add_context_lttng 0 -u "$@"
+}
+
+function add_context_ust_fail()
+{
+       add_context_lttng 1 -u "$@"
+}
+
+function add_context_kernel_ok()
+{
+       add_context_lttng 0 -k "$@"
+}
+
+function add_context_kernel_fail()
+{
+       add_context_lttng 1 -k "$@"
 }
 
 function trace_matches ()
@@ -778,7 +1242,7 @@ function trace_matches ()
 
        if [ "$count" -ne "$nr_iter" ]; then
                fail "Trace match"
-               diag "$count events found in trace"
+               diag "$count matching events found in trace"
        else
                pass "Trace match"
        fi
@@ -830,6 +1294,18 @@ function validate_trace
        return $ret
 }
 
+function trace_first_line
+{
+       local trace_path=$1
+
+       which $BABELTRACE_BIN >/dev/null
+       if [ $? -ne 0 ]; then
+           skip 0 "Babeltrace binary not found. Skipping trace validation"
+       fi
+
+       $BABELTRACE_BIN $trace_path 2>/dev/null | head -n 1
+}
+
 function validate_trace_exp()
 {
        local event_exp=$1
@@ -889,3 +1365,37 @@ function validate_trace_empty()
        ret=$?
        return $ret
 }
+
+function metadata_regenerate ()
+{
+       local expected_to_fail=$1
+       local sess_name=$2
+
+       $TESTDIR/../src/bin/lttng/$LTTNG_BIN metadata regenerate -s $sess_name 1> $OUTPUT_DEST 2> $ERROR_OUTPUT_DEST
+       ret=$?
+       if [[ $expected_to_fail -eq "1" ]]; then
+               test "$ret" -ne "0"
+               ok $? "Expected fail on regenerate $sess_name"
+       else
+               ok $ret "Metadata regenerate $sess_name"
+       fi
+}
+
+function metadata_regenerate_ok ()
+{
+       metadata_regenerate 0 "$@"
+}
+
+function metadata_regenerate_fail ()
+{
+       metadata_regenerate 1 "$@"
+}
+
+function destructive_tests_enabled ()
+{
+       if [ ${LTTNG_ENABLE_DESTRUCTIVE_TESTS} = "will-break-my-system" ]; then
+               return 0
+       else
+               return 1
+       fi
+}
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