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      1 
      2 clear_trace() { # reset trace output
      3     echo > trace
      4 }
      5 
      6 disable_tracing() { # stop trace recording
      7     echo 0 > tracing_on
      8 }
      9 
     10 enable_tracing() { # start trace recording
     11     echo 1 > tracing_on
     12 }
     13 
     14 reset_tracer() { # reset the current tracer
     15     echo nop > current_tracer
     16 }
     17 
     18 reset_trigger_file() {
     19     # remove action triggers first
     20     grep -H ':on[^:]*(' $@ |
     21     while read line; do
     22         cmd=`echo $line | cut -f2- -d: | cut -f1 -d"["`
     23 	file=`echo $line | cut -f1 -d:`
     24 	echo "!$cmd" >> $file
     25     done
     26     grep -Hv ^# $@ |
     27     while read line; do
     28         cmd=`echo $line | cut -f2- -d: | cut -f1 -d"["`
     29 	file=`echo $line | cut -f1 -d:`
     30 	echo "!$cmd" > $file
     31     done
     32 }
     33 
     34 reset_trigger() { # reset all current setting triggers
     35     if [ -d events/synthetic ]; then
     36         reset_trigger_file events/synthetic/*/trigger
     37     fi
     38     reset_trigger_file events/*/*/trigger
     39 }
     40 
     41 reset_events_filter() { # reset all current setting filters
     42     grep -v ^none events/*/*/filter |
     43     while read line; do
     44 	echo 0 > `echo $line | cut -f1 -d:`
     45     done
     46 }
     47 
     48 reset_ftrace_filter() { # reset all triggers in set_ftrace_filter
     49     echo > set_ftrace_filter
     50     grep -v '^#' set_ftrace_filter | while read t; do
     51 	tr=`echo $t | cut -d: -f2`
     52 	if [ "$tr" = "" ]; then
     53 	    continue
     54 	fi
     55 	if ! grep -q "$t" set_ftrace_filter; then
     56 		continue;
     57 	fi
     58 	name=`echo $t | cut -d: -f1 | cut -d' ' -f1`
     59 	if [ $tr = "enable_event" -o $tr = "disable_event" ]; then
     60 	    tr=`echo $t | cut -d: -f2-4`
     61 	    limit=`echo $t | cut -d: -f5`
     62 	else
     63 	    tr=`echo $t | cut -d: -f2`
     64 	    limit=`echo $t | cut -d: -f3`
     65 	fi
     66 	if [ "$limit" != "unlimited" ]; then
     67 	    tr="$tr:$limit"
     68 	fi
     69 	echo "!$name:$tr" > set_ftrace_filter
     70     done
     71 }
     72 
     73 disable_events() {
     74     echo 0 > events/enable
     75 }
     76 
     77 clear_synthetic_events() { # reset all current synthetic events
     78     grep -v ^# synthetic_events |
     79     while read line; do
     80         echo "!$line" >> synthetic_events
     81     done
     82 }
     83 
     84 initialize_ftrace() { # Reset ftrace to initial-state
     85 # As the initial state, ftrace will be set to nop tracer,
     86 # no events, no triggers, no filters, no function filters,
     87 # no probes, and tracing on.
     88     disable_tracing
     89     reset_tracer
     90     reset_trigger
     91     reset_events_filter
     92     reset_ftrace_filter
     93     disable_events
     94     echo > set_event_pid	# event tracer is always on
     95     echo > set_ftrace_pid
     96     [ -f set_ftrace_filter ] && echo | tee set_ftrace_*
     97     [ -f set_graph_function ] && echo | tee set_graph_*
     98     [ -f stack_trace_filter ] && echo > stack_trace_filter
     99     [ -f kprobe_events ] && echo > kprobe_events
    100     [ -f uprobe_events ] && echo > uprobe_events
    101     [ -f synthetic_events ] && echo > synthetic_events
    102     [ -f snapshot ] && echo 0 > snapshot
    103     clear_trace
    104     enable_tracing
    105 }
    106 
    107 LOCALHOST=127.0.0.1
    108 
    109 yield() {
    110     ping $LOCALHOST -c 1 || sleep .001 || usleep 1 || sleep 1
    111 }
    112