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

et_collector(3erl)		     Erlang Module Definition		       et_collector(3erl)

       et_collector  -	Collect trace events and provide a backing storage appropriate for itera-

       Interface module for the Event Trace (ET) application

       start_link(Options) -> {ok, CollectorPid} | {error, Reason}

	      Types  Options = [option()]
		     option()  =   {parent_pid,   pid()}   |   {event_order,   event_order()}	|
		     {dict_insert, {filter, collector}, collector_fun()} | {dict_insert, {filter,
		     event_filter_name()},  event_filter_fun()}  |   {dict_insert,   {subscriber,
		     pid()},  dict_val()} | {dict_insert, dict_key(), dict_val()} | {dict_delete,
		     dict_key()} | {trace_client, trace_client()} | {trace_global,  boolean()}	|
		     {trace_pattern,	 trace_pattern()}    |	  {trace_port,	  integer()}	|
		     {trace_max_queue, integer()}
		     event_order() = trace_ts | event_ts
		     trace_pattern() = {report_module(), extended_dbg_match_spec()} | undefined
		     report_module()  =  atom()  |  undefined  <v>extended_dbg_match_spec()()	=
		     detail_level() | dbg_match_spec()
		     detail_level() = min | max | integer(X) when X =< 0, X >= 100
		     trace_client()    =    {event_file,    file_name()}   |   {dbg_trace_type(),
		     file_name() = string()
		     collector_fun() = trace_filter_fun() | event_filter_fun()
		     trace_filter_fun() = fun(TraceData) -> false | true | {true, NewEvent}
		     event_filter_fun() = fun(Event) -> false | true | {true, NewEvent}
		     event_filter_name() = atom()
		     TraceData = erlang_trace_data()
		     Event = NewEvent = record(event)
		     dict_key() = term()
		     dict_val() = term()
		     CollectorPid = pid()
		     Reason = term()

	      Start a collector process.

	      The collector collects trace events and keeps them ordered by their timestamp.  The
	      timestamp  may  either  reflect  the  time when the actual trace data was generated
	      (trace_ts) or when the trace data was transformed into an event record  (event_ts).
	      If  the  time  stamp  is	missing  in  the  trace data (missing timestamp option to
	      erlang:trace/4) the trace_ts will be set to the event_ts.

	      Events are reported to the collector directly with the  report  function	or  indi-
	      rectly  via  one or more trace clients. All reported events are first filtered thru
	      the collector filter before they are stored by  the  collector.  By  replacing  the
	      default  collector  filter with a customized dito it is possible to allow any trace
	      data as input. The collector filter is a dictionary entry with the  predefined  key
	      {filter, collector} and the value is a fun of arity 1. See et_selector:make_event/1
	      for interface details, such as which erlang:trace/1 tuples that are accepted.

	      The collector has a built-in dictionary service. Any term may be stored as value in
	      the  dictionary  and  bound  to  a unique key. When new values are inserted with an
	      existing key, the new values will overwrite the existing ones. Processes	may  sub-
	      scribe  on  dictionary  updates by using {subscriber, pid()} as dictionary key. All
	      dictionary updates will be propagated to the subscriber processes matching the pat-
	      tern {{subscriber, '_'}, '_'} where the first '_' is interpreted as a pid().

	      In  global  trace  mode, the collector will automatically start tracing on all con-
	      nected Erlang nodes. When a node connects, a port tracer will be	started  on  that
	      node and a corresponding trace client on the collector node.

	      Default values:

		* parent_pid - self().

		* event_order - trace_ts.

		* trace_global - false.

		* trace_pattern - undefined.

		* trace_port - 4711.

		* trace_max_queue - 50.

       stop(CollectorPid) -> ok

	      Types  CollectorPid = pid()

	      Stop a collector process.

       save_event_file(CollectorPid, FileName, Options) -> ok | {error, Reason}

	      Types  CollectorPid = pid()
		     FileName = string()
		     Options = [option()]
		     Reason = term()
		     option() = event_option() | file_option() | table_option()
		     event_option() = existing
		     file_option() = write | append
		     table_option() = keep | clear

	      Save the events to a file.

	      By  default  the currently stored events (existing) are written to a brand new file
	      (write) and the events are kept (keep) after they have been written to the file.

	      Instead of keeping the events after writing them to file, it is possible to  remove
	      all stored events after they have successfully written to file (clear).

	      The options defaults to existing, write and keep.

       load_event_file(CollectorPid, FileName) -> {ok, BadBytes} | exit(Reason)

	      Types  CollectorPid = pid()
		     FileName = string()
		     BadBytes = integer(X) where X >= 0
		     Reason = term()

	      Load the event table from a file.

       report(Handle, TraceOrEvent) -> {ok, Continuation} | exit(Reason)
       report_event(Handle,  DetailLevel,  FromTo,  Label,  Contents)  ->  {ok,  Continuation}	|
       report_event(Handle, DetailLevel, From, To,  Label,  Contents)  ->  {ok,  Continuation}	|

	      Types  Handle = Initial | Continuation
		     Initial = collector_pid()
		     collector_pid() = pid()
		     Continuation = record(table_handle)
		     TraceOrEvent = record(event) | dbg_trace_tuple() | end_of_trace
		     Reason = term()
		     DetailLevel = integer(X) when X =< 0, X >= 100
		     From = actor()
		     To = actor()
		     FromTo = actor()
		     Label = atom() | string() | term()
		     Contents = [{Key, Value}] | term()
		     actor() = term()

	      Report an event to the collector.

	      All  events  are filtered thru the collector filter, which optionally may transform
	      or discard the event. The first call should use the pid of the collector process as
	      report handle, while subsequent calls should use the table handle.

       make_key(Type, Stuff) -> Key

	      Types  Type = record(table_handle) | trace_ts | event_ts
		     Stuff = record(event) | Key
		     Key = record(event_ts) | record(trace_ts)

	      Make a key out of an event record or an old key.

       get_table_handle(CollectorPid) -> Handle

	      Types  CollectorPid = pid()
		     Handle = record(table_handle)

	      Return a table handle.

       get_global_pid() -> CollectorPid | exit(Reason)

	      Types  CollectorPid = pid()
		     Reason = term()

	      Return a the identity of the globally registered collector if there is any.

       change_pattern(CollectorPid, RawPattern) -> {old_pattern, TracePattern}

	      Types  CollectorPid = pid()
		     RawPattern = {report_module(), extended_dbg_match_spec()}
		     report_module() = atom() | undefined
		     extended_dbg_match_spec()() = detail_level() | dbg_match_spec()
		     RawPattern = detail_level()
		     detail_level() = min | max | integer(X) when X =< 0, X >= 100
		     TracePattern = {report_module(), dbg_match_spec_match_spec()}

	      Change active trace pattern globally on all trace nodes.

       dict_insert(CollectorPid, {filter, collector}, FilterFun) -> ok
       dict_insert(CollectorPid, {subscriber, SubscriberPid}, Void) -> ok
       dict_insert(CollectorPid, Key, Val) -> ok

	      Types  CollectorPid = pid()
		     FilterFun = filter_fun()
		     SubscriberPid = pid()
		     Void = term()
		     Key = term()
		     Val = term()

	      Insert  a  dictionary  entry  and send a {et, {dict_insert, Key, Val}} tuple to all
	      registered subscribers.

	      If the entry is a new subscriber, it will imply that  the  new  subscriber  process
	      first  will get one message for each already stored dictionary entry, before it and
	      all old subscribers will get this particular entry. The collector process links  to
	      and  then supervises the subscriber process. If the subscriber process dies it will
	      imply that it gets unregistered as with a normal dict_delete/2.

       dict_lookup(CollectorPid, Key) -> [Val]

	      Types  CollectorPid = pid()
		     FilterFun = filter_fun()
		     CollectorPid = pid()
		     Key = term()
		     Val = term()

	      Lookup a dictionary entry and return zero or one value.

       dict_delete(CollectorPid, Key) -> ok

	      Types  CollectorPid = pid()
		     SubscriberPid = pid()
		     Key = {subscriber, SubscriberPid} | term()

	      Delete a dictionary entry and send a {et, {dict_delete, Key}} tuple to  all  regis-
	      tered subscribers.

	      If  the deleted entry is a registered subscriber, it will imply that the subscriber
	      process gets is unregistered as subscriber as well as it gets it final message.

       dict_match(CollectorPid, Pattern) -> [Match]

	      Types  CollectorPid = pid()
		     Pattern = '_' | {key_pattern(), val_pattern()}
		     key_pattern() = ets_match_object_pattern()
		     val_pattern() = ets_match_object_pattern()
		     Match = {key(), val()}
		     key() = term()
		     val() = term()

	      Match some dictionary entries

       multicast(_CollectorPid, Msg) -> ok

	      Types  CollectorPid = pid()
		     CollectorPid = pid()
		     Msg = term()

	      Sends a message to all registered subscribers.

       start_trace_client(CollectorPid, Type, Parameters)  ->  file_loaded  |  {trace_client_pid,
       pid()} | exit(Reason)

	      Types  Type = dbg_trace_client_type()
		     Parameters = dbg_trace_client_parameters()
		     Pid = dbg_trace_client_pid()

	      Load raw Erlang trace from a file, port or process.

       iterate(Handle, Prev, Limit) -> NewAcc

	      Short for iterate(Handle, Prev, Limit, undefined, Prev) -> NewAcc

       iterate(Handle, Prev, Limit, Fun, Acc) -> NewAcc

	      Types  Handle = collector_pid() | table_handle()
		     Prev = first | last | event_key()
		     Limit = done() | forward() | backward()
		     collector_pid() = pid()
		     table_handle() = record(table_handle)
		     event_key() = record(event) | record(event_ts) | record(trace_ts)
		     done() = 0
		     forward() = infinity | integer(X) where X > 0
		     backward() = '-infinity' | integer(X) where X < 0
		     Fun = fun(Event, Acc) -> NewAcc <v>Acc = NewAcc = term()

	      Iterate over the currently stored events.

	      Iterates	over  the  currently stored events and applies a function for each event.
	      The iteration may be performed forwards or backwards and may be limited to a  maxi-
	      mum number of events (abs(Limit)).

       clear_table(Handle) -> ok

	      Types  Handle = collector_pid() | table_handle()
		     collector_pid() = pid()
		     table_handle() = record(table_handle)

	      Clear the event table.

Ericsson AB				     et 1.4.2			       et_collector(3erl)

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