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