log_mf_h(3erl) [linux man page]

log_mf_h(3erl)						     Erlang Module Definition						    log_mf_h(3erl)

NAME

       log_mf_h - An Event Handler which Logs Events to Disk

DESCRIPTION

       The  log_mf_h is a gen_event handler module which can be installed in any gen_event process. It logs onto disk all events which are sent to
       an event manager. Each event is written as a binary which makes the logging very fast. However, a tool such as the Report Browser  (  rb  )
       must  be used in order to read the files. The events are written to multiple files. When all files have been used, the first one is re-used
       and overwritten. The directory location, the number of files, and the size of each file are configurable. The directory	will  include  one
       file called index , and report files 1, 2, .... .

EXPORTS

       init(Dir, MaxBytes, MaxFiles)
       init(Dir, MaxBytes, MaxFiles, Pred) -> Args

	      Types  Dir = string()
		     MaxBytes = integer()
		     MaxFiles = 0 < integer() < 256
		     Pred = fun(Event) -> boolean()
		     Event = term()
		     Args = args()

	      Initiates  the  event  handler.  This  function  returns	Args  ,  which should be used in a call to gen_event:add_handler(EventMgr,
	      log_mf_h, Args) .

	      Dir specifies which directory to use for the log files. MaxBytes specifies the size of each individual file. MaxFiles specifies  how
	      many  files  are used. Pred is a predicate function used to filter the events. If no predicate function is specified, all events are
	      logged.

SEE ALSO

       gen_event(3erl) , rb(3erl)

Ericsson AB							   stdlib 1.17.3						    log_mf_h(3erl)

nteventlog(3erl)					     Erlang Module Definition						  nteventlog(3erl)

NAME

       nteventlog - Interface to Windows Event Log

DESCRIPTION

       nteventlog  provides a generic interface to the Windows event log. It is part of the OS_Mon application, see os_mon(7) . Available for Win-
       dows versions where the event log is available. That is, not for Windows 98 and some other older Windows  versions,  but  for  most  (all?)
       newer Windows versions.

       This module is used as the Windows backend for os_sup , see os_sup(3erl) .

       To  retain  backwards  compatibility, this module can also be used to start a standalone nteventlog process which is not part of the OS_Mon
       supervision tree. When starting such a process, the user has to supply an identifier as well as a callback function to handle the messages.

       The identifier, an arbitrary string, should be reused whenever the same application (or node) wants to start  the  process.  nteventlog	is
       informed about all events that have arrived to the eventlog since the last accepted message for the current identifier. As long as the same
       identifier is used, the same eventlog record will not be sent to nteventlog more than once (with the exception of when graved system  fail-
       ures arise, in which case the last records written before the failure may be sent to Erlang again after reboot).

       If  the event log is configured to wrap around automatically, records that have arrived to the log and been overwritten when nteventlog was
       not running are lost. It however detects this state and loses no records that are not overwritten.

       The callback function works as described in os_sup(3erl) .

EXPORTS

       start(Identifier, MFA) -> Result
       start_link(Identifier, MFA) -> Result

	      Types  Identifier = string() | atom()
		     MFA = {Mod, Func, Args}
		     Mod = Func = atom()
		     Args = [term()]
		     Result = {ok, Pid} | {error, {already_started, Pid}}
		     Pid = pid()

	      This function starts the standalone nteventlog process and, if start_link/2 is used, links to it.

	      Identifier is an identifier as described above.

	      MFA is the supplied callback function. When nteventlog receives information about a new event,  this  function  will  be	called	as
	      apply(Mod, Func, [Event|Args]) where Event is a tuple

       stop() -> stopped

	      Types  Result = stopped

	      Stops nteventlog . Usually only used during development. The server does not have to be shut down gracefully to maintain its state.

SEE ALSO

       os_mon(7) , os_sup(3erl)

       Windows NT documentation

Ericsson AB							   os_mon 2.2.5 						  nteventlog(3erl)