tools/testing/selftests/ftrace/test.d/ftrace/func-filter-pid.tc

   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     if [ $do_function_fork -eq 0 ]; then
  39         return
  40     fi
  41
  42     echo $orig_value > trace_options
  43 }
  44
  45 fail() { # msg
  46     do_reset
  47     echo $1
  48     exit_fail
  49 }
  50
  51 do_test() {
  52     disable_tracing
  53
  54     echo do_execve* > set_ftrace_filter
  55     echo *do_fork >> set_ftrace_filter
  56
  57     echo $PID > set_ftrace_pid
  58     echo function > current_tracer
  59
  60     if [ $do_function_fork -eq 1 ]; then
  61         # don't allow children to be traced
  62         echo nofunction-fork > trace_options
  63     fi
  64
  65     enable_tracing
  66     yield
  67
  68     count_pid=`cat trace | grep -v ^# | grep $PID | wc -l`
  69     count_other=`cat trace | grep -v ^# | grep -v $PID | wc -l`
  70
  71     # count_other should be 0
  72     if [ $count_pid -eq 0 -o $count_other -ne 0 ]; then
  73         fail "PID filtering not working?"
  74     fi
  75
  76     disable_tracing
  77     clear_trace
  78
  79     if [ $do_function_fork -eq 0 ]; then
  80         return
  81     fi
  82
  83     # allow children to be traced
  84     echo function-fork > trace_options
  85
  86     enable_tracing
  87     yield
  88
  89     count_pid=`cat trace | grep -v ^# | grep $PID | wc -l`
  90     count_other=`cat trace | grep -v ^# | grep -v $PID | wc -l`
  91
  92     # count_other should NOT be 0
  93     if [ $count_pid -eq 0 -o $count_other -eq 0 ]; then
  94         fail "PID filtering not following fork?"
  95     fi
  96 }
  97
  98 do_test
  99
 100 mkdir instances/foo
 101 cd instances/foo
 102 do_test
 103 cd ../../
 104 rmdir instances/foo
 105
 106 do_reset
 107
 108 exit 0