linux_kernel/tools/testing/selftests/ftrace/test.d/trigger/trigger-snapshot.tc

#!/bin/sh
# description: event trigger - test snapshot-trigger

do_reset() {
    reset_trigger
    echo > set_event
    clear_trace
}

fail() { #msg
    do_reset
    echo $1
    exit $FAIL
}

if [ ! -f set_event -o ! -d events/sched ]; then
    echo "event tracing is not supported"
    exit_unsupported
fi

if [ ! -f events/sched/sched_process_fork/trigger ]; then
    echo "event trigger is not supported"
    exit_unsupported
fi

if [ ! -f snapshot ]; then
    echo "snapshot is not supported"
    exit_unsupported
fi

reset_tracer
do_reset

FEATURE=`grep snapshot events/sched/sched_process_fork/trigger`
if [ -z "$FEATURE" ]; then
    echo "snapshot trigger is not supported"
    exit_unsupported
fi

echo "Test snapshot tigger"
echo 0 > snapshot
echo 1 > events/sched/sched_process_fork/enable
( echo "forked")
echo 'snapshot:1' > events/sched/sched_process_fork/trigger
( echo "forked")
grep sched_process_fork snapshot > /dev/null || \
    fail "snapshot trigger on sched_process_fork did not work"

reset_trigger
echo 0 > snapshot
echo 0 > events/sched/sched_process_fork/enable

echo "Test snapshot semantic errors"

! echo "snapshot+1" > events/sched/sched_process_fork/trigger
echo "snapshot" > events/sched/sched_process_fork/trigger
! echo "snapshot" > events/sched/sched_process_fork/trigger

do_reset

exit 0