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