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       sasl - The SASL Application


       This section describes the SASL (System Architecture Support Libraries)
       application which provides the following services:

         * alarm_handler

         * overload

         * rb

         * release_handler

         * systools

       The SASL application also  includes  error_logger  event  handlers  for
       formatting SASL error and crash reports.

       The   SASL   application   in  OTP  has  nothing  to  do  with  "Simple
       Authentication and Security Layer" (RFC 4422).


       The following error logger event  handlers  are  defined  in  the  SASL

         sasl_report_tty_h :
           Formats  and writes supervisor reports , crash reports and progress
           reports to stdio .

         sasl_report_file_h :
           Formats and writes supervisor reports , crash report  and  progress
           report to a single file.

         error_logger_mf_h :
           This  error  logger  writes  all events sent to the error logger to
           disk. It installs the log_mf_h event handler  in  the  error_logger


       The  following  configuration  parameters  are  defined  for  the  SASL
       application.  See  app(5)  for  more  information  about  configuration

         sasl_error_logger = Value <optional> :
           Value is one of:

           tty :
             Installs  sasl_report_tty_h  in  the  error  logger.  This is the
             default option.

           {file,FileName} :
             Installs sasl_report_file_h in the error logger. This  makes  all
             reports go to the file FileName . FileName is a string.

           false :
             No SASL error logger handler is installed.

         errlog_type = error | progress | all <optional> :
           Restricts   the   error   logging   performed   by   the  specified
           sasl_error_logger to error  reports,  progress  reports,  or  both.
           Default is all .

         error_logger_mf_dir = string() | false<optional> :
           Specifies  in  which  directory  the  files  are  stored.  If  this
           parameter is undefined or false  ,  the  error_logger_mf_h  is  not

         error_logger_mf_maxbytes = integer() <optional> :
           Specifies  how large each individual file can be. If this parameter
           is undefined, the error_logger_mf_h is not installed.

         error_logger_mf_maxfiles = 0<integer()<256 <optional> :
           Specifies how many files are used. If this parameter is  undefined,
           the error_logger_mf_h is not installed.

         overload_max_intensity = float() > 0 <optional> :
           Specifies the maximum intensity for overload . Default is 0.8 .

         overload_weight = float() > 0 <optional> :
           Specifies the overload weight. Default is 0.1 .

         start_prg = string() <optional> :
           Specifies  which program should be used when restarting the system.
           Default is $OTP_ROOT/bin/start .

         masters = [atom()] <optional> :
           Specifies  which  nodes  this  node  uses  to  read/write   release
           information.  This  parameter  is  ignored  if the client_directory
           parameter is not set.

         client_directory = string() <optional> :
           This parameter specifies the client directory at the master  nodes.
           Refer  to  Release  Handling  in  OTP  Design  Principles  for more
           information. This parameter is ignored if the masters parameter  is
           not set.

         static_emulator = true | false <optional> :
           Indicates  if  the  Erlang emulator is statically installed. A node
           with a static emulator cannot switch dynamically to a new  emulator
           as  the  executable  files are written into memory statically. This
           parameter is ignored if the masters and client_directory parameters
           are not set.

         releases_dir = string() <optional> :
           Indicates  where  the  releases  directory  is located. The release
           handler writes all its files to this directory. If  this  parameter
           is  not  set,  the  OS  environment  parameter  RELDIR  is used. By
           default, this is $OTP_ROOT/releases .

         utc_log = true | false <optional> :
           If set to true , all dates in textual log outputs are displayed  in
           Universal Coordinated Time with the string UTC appended.


       alarm_handler(3erl)      ,      error_logger(3erl),     log_mf_h(3erl),
       overload(3erl) , rb(3erl) , release_handler(3erl) , systools(3erl)