1 #!/bin/sh 2 # SPDX-License-Identifier: GPL-2.0 3 # description: ftrace - function pid filters 4 5 # Make sure that function pid matching filter works. 6 # Also test it on an instance directory 7 8 if ! grep -q function available_tracers; then 9 echo "no function tracer configured" 10 exit_unsupported 11 fi 12 13 if [ ! -f set_ftrace_pid ]; then 14 echo "set_ftrace_pid not found? Is function tracer not set?" 15 exit_unsupported 16 fi 17 18 if [ ! -f set_ftrace_filter ]; then 19 echo "set_ftrace_filter not found? Is function tracer not set?" 20 exit_unsupported 21 fi 22 23 do_function_fork=1 24 25 if [ ! -f options/function-fork ]; then 26 do_function_fork=0 27 echo "no option for function-fork found. Option will not be tested." 28 fi 29 30 read PID _ < /proc/self/stat 31 32 if [ $do_function_fork -eq 1 ]; then 33 # default value of function-fork option 34 orig_value=`grep function-fork trace_options` 35 fi 36 37 do_reset() { 38 reset_tracer 39 clear_trace 40 enable_tracing 41 echo > set_ftrace_filter 42 echo > set_ftrace_pid 43 44 if [ $do_function_fork -eq 0 ]; then 45 return 46 fi 47 48 echo $orig_value > trace_options 49 } 50 51 fail() { # msg 52 do_reset 53 echo $1 54 exit_fail 55 } 56 57 yield() { 58 ping localhost -c 1 || sleep .001 || usleep 1 || sleep 1 59 } 60 61 do_test() { 62 disable_tracing 63 64 echo do_execve* > set_ftrace_filter 65 echo *do_fork >> set_ftrace_filter 66 67 echo $PID > set_ftrace_pid 68 echo function > current_tracer 69 70 if [ $do_function_fork -eq 1 ]; then 71 # don't allow children to be traced 72 echo nofunction-fork > trace_options 73 fi 74 75 enable_tracing 76 yield 77 78 count_pid=`cat trace | grep -v ^# | grep $PID | wc -l` 79 count_other=`cat trace | grep -v ^# | grep -v $PID | wc -l` 80 81 # count_other should be 0 82 if [ $count_pid -eq 0 -o $count_other -ne 0 ]; then 83 fail "PID filtering not working?" 84 fi 85 86 disable_tracing 87 clear_trace 88 89 if [ $do_function_fork -eq 0 ]; then 90 return 91 fi 92 93 # allow children to be traced 94 echo function-fork > trace_options 95 96 enable_tracing 97 yield 98 99 count_pid=`cat trace | grep -v ^# | grep $PID | wc -l` 100 count_other=`cat trace | grep -v ^# | grep -v $PID | wc -l` 101 102 # count_other should NOT be 0 103 if [ $count_pid -eq 0 -o $count_other -eq 0 ]; then 104 fail "PID filtering not following fork?" 105 fi 106 } 107 108 do_test 109 110 mkdir instances/foo 111 cd instances/foo 112 do_test 113 cd ../../ 114 rmdir instances/foo 115 116 do_reset 117 118 exit 0 119
