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|
#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
# description: ftrace - function pid notrace filters
# flags: instance
# Make sure that function pid matching filter with notrace works.
if ! grep -q function available_tracers; then
echo "no function tracer configured"
exit_unsupported
fi
if [ ! -f set_ftrace_notrace_pid ]; then
echo "set_ftrace_notrace_pid not found? Is function tracer not set?"
exit_unsupported
fi
if [ ! -f set_ftrace_filter ]; then
echo "set_ftrace_filter not found? Is function tracer not set?"
exit_unsupported
fi
do_function_fork=1
if [ ! -f options/function-fork ]; then
do_function_fork=0
echo "no option for function-fork found. Option will not be tested."
fi
read PID _ < /proc/self/stat
if [ $do_function_fork -eq 1 ]; then
# default value of function-fork option
orig_value=`grep function-fork trace_options`
fi
do_reset() {
if [ $do_function_fork -eq 0 ]; then
return
fi
echo > set_ftrace_notrace_pid
echo $orig_value > trace_options
}
fail() { # msg
do_reset
echo $1
exit_fail
}
do_test() {
disable_tracing
echo do_execve* > set_ftrace_filter
echo *do_fork >> set_ftrace_filter
echo $PID > set_ftrace_notrace_pid
echo function > current_tracer
if [ $do_function_fork -eq 1 ]; then
# don't allow children to be traced
echo nofunction-fork > trace_options
fi
enable_tracing
yield
count_pid=`cat trace | grep -v ^# | grep $PID | wc -l`
count_other=`cat trace | grep -v ^# | grep -v $PID | wc -l`
# count_pid should be 0
if [ $count_pid -ne 0 -o $count_other -eq 0 ]; then
fail "PID filtering not working? traced task = $count_pid; other tasks = $count_other "
fi
disable_tracing
clear_trace
if [ $do_function_fork -eq 0 ]; then
return
fi
# allow children to be traced
echo function-fork > trace_options
# With pid in both set_ftrace_pid and set_ftrace_notrace_pid
# there should not be any tasks traced.
echo $PID > set_ftrace_pid
enable_tracing
yield
count_pid=`cat trace | grep -v ^# | grep $PID | wc -l`
count_other=`cat trace | grep -v ^# | grep -v $PID | wc -l`
# both should be zero
if [ $count_pid -ne 0 -o $count_other -ne 0 ]; then
fail "PID filtering not following fork? traced task = $count_pid; other tasks = $count_other "
fi
}
do_test
do_reset
exit 0
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