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Linux 2.6 - man page for et_selector (linux section 3erl)

et_selector(3erl)		     Erlang Module Definition			et_selector(3erl)

NAME
       et_selector - Define event transforms and trace patterns

DESCRIPTION
EXPORTS
       make_pattern(RawPattern) -> TracePattern

	      Types  RawPattern = detail_level()
		     TracePattern = erlang_trace_pattern_match_spec()
		     detail_level() = min | max | integer(X) when X >= 0, X =< 100

	      Makes a trace pattern suitable to feed change_pattern/1

	      Min detail level deactivates tracing of calls to et:trace_me/4,5

	      Max detail level activates tracing of all calls to et:trace_me/4,5

	      integer(X)  detail  level  activates  tracing of all calls to et:trace_me/4,5 whose
	      detail level argument is lesser than X.

	      See also erlang:trace_pattern/2 for more info about its match_spec()

       change_pattern(Pattern) -> ok

	      Types  Pattern  =   detail_level()   |   empty_match_spec()   |	erlang_trace_pat-
		     tern_match_spec()
		     detail_level() = min | max | integer(X) when X >= 0, X =< 100
		     empty_match_spec() = []

	      Activates/deactivates tracing by changing the current trace pattern.

	      min detail level deactivates tracing of calls to et:trace_me/4,5

	      max detail level activates tracing of all calls to et:trace_me/4,5

	      integer(X)  detail  level  activates  tracing of all calls to et:trace_me/4,5 whose
	      detail level argument is lesser than X .

	      An empty match spec deactivates tracing of calls to et:trace_me/4,5

	      Other match specs activates tracing of calls to  et:trace_me/4,5	accordingly  with
	      erlang:trace_pattern/2 .

       parse_event(Mod, ValidTraceData) -> false | true | {true, Event}

	      Types  Mod  = module_name() | undefined <v>module_name() = atom() <v>ValidTraceData
		     = erlang_trace_data() | record(event)
		     erlang_trace_data() = {trace, Pid, Label, Info} | {trace, Pid, Label,  Info,
		     Extra}  |	{trace_ts, Pid, Label, Info, ReportedTS} | {trace_ts, Pid, Label,
		     Info, Extra, ReportedTS} | {seq_trace, Label,  Info}  |  {seq_trace,  Label,
		     Info, ReportedTS} | {drop, NumberOfDroppedItems}

	      Transforms trace data and makes an event record out of it.

	      See erlang:trace/3 for more info about the semantics of the trace data.

	      An event record consists of the following fields:

		detail_level :
		  Noise has a high level as opposed to essentials.

		trace_ts :
		  Time when the trace was generated. Same as event_ts if omitted in trace data.

		event_ts :
		  Time when the event record was created.

		from :
		  From actor, such as sender of a message.

		to :
		  To actor, such as receiver of message.

		label :
		  Label intended to provide a brief event summary.

		contents :
		  All nitty gritty details of the event.

	      See et:trace_me/4 and et:trace_me/5 for details.

	      Returns:

		{true, Event} :
		  where Event is an #event{} record representing the trace data

		true :
		  means that the trace data already is an event record and that it is valid as it
		  is. No transformation is needed.

		false :
		  means that the trace data is uninteresting and should be dropped

Ericsson AB				     et 1.4.2				et_selector(3erl)


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