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#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
# description: event tracing - enable/disable with top level files
do_reset() {
echo > set_event
clear_trace
}
fail() { #msg
do_reset
echo $1
exit_fail
}
yield() {
ping localhost -c 1 || sleep .001 || usleep 1 || sleep 1
}
if [ ! -f available_events -o ! -f set_event -o ! -d events ]; then
echo "event tracing is not supported"
exit_unsupported
fi
reset_tracer
do_reset
echo '*:*' > set_event
yield
echo 0 > tracing_on
count=`head -n 128 trace | grep -v ^# | wc -l`
if [ $count -eq 0 ]; then
fail "none of events are recorded"
fi
do_reset
echo 1 > events/enable
echo 1 > tracing_on
yield
echo 0 > tracing_on
count=`head -n 128 trace | grep -v ^# | wc -l`
if [ $count -eq 0 ]; then
fail "none of events are recorded"
fi
do_reset
echo 0 > events/enable
yield
count=`cat trace | grep -v ^# | wc -l`
if [ $count -ne 0 ]; then
fail "any of events should not be recorded"
fi
do_reset
exit 0
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