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     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