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#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
# description: event trigger - test poll wait on histogram
# requires: set_event events/sched/sched_process_free/trigger events/sched/sched_process_free/hist
# flags: instance
POLL=${FTRACETEST_ROOT}/poll
if [ ! -x ${POLL} ]; then
echo "poll program is not compiled!"
exit_unresolved
fi
EVENT=events/sched/sched_process_free/
# Check poll ops is supported. Before implementing poll on hist file, it
# returns soon with POLLIN | POLLOUT, but not POLLPRI.
# This must wait >1 sec and return 1 (timeout).
set +e
${POLL} -I -t 1000 ${EVENT}/hist
ret=$?
set -e
if [ ${ret} != 1 ]; then
echo "poll on hist file is not supported"
exit_unsupported
fi
# Test POLLIN
echo > trace
echo 'hist:key=comm if comm =="sleep"' > ${EVENT}/trigger
echo 1 > ${EVENT}/enable
# This sleep command will exit after 2 seconds.
sleep 2 &
BGPID=$!
# if timeout happens, poll returns 1.
${POLL} -I -t 4000 ${EVENT}/hist
echo 0 > tracing_on
if [ -d /proc/${BGPID} ]; then
echo "poll exits too soon"
kill -KILL ${BGPID} ||:
exit_fail
fi
if ! grep -qw "sleep" trace; then
echo "poll exits before event happens"
exit_fail
fi
# Test POLLPRI
echo > trace
echo 1 > tracing_on
# This sleep command will exit after 2 seconds.
sleep 2 &
BGPID=$!
# if timeout happens, poll returns 1.
${POLL} -P -t 4000 ${EVENT}/hist
echo 0 > tracing_on
if [ -d /proc/${BGPID} ]; then
echo "poll exits too soon"
kill -KILL ${BGPID} ||:
exit_fail
fi
if ! grep -qw "sleep" trace; then
echo "poll exits before event happens"
exit_fail
fi
exit_pass
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