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NAME

       sasl - The SASL Application

DESCRIPTION

       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.

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

ERROR LOGGER EVENT HANDLERS

       The following error logger event handlers are used by the SASL application.

         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.

         log_mf_h:
           This error logger writes all events sent to the error logger to disk.

           To activate this event handler, the following three sasl configuration parameters must
           be set: error_logger_mf_dir,  error_logger_mf_maxbytes  and  error_logger_mf_maxfiles.
           See below for more information about the configuration parameters.

CONFIGURATION

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

         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 log_mf_h handler is not installed.

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

         error_logger_mf_maxfiles = 0<integer()<256 <optional>:
           Specifies how many files are used.  If  this  parameter  is  undefined,  the  log_mf_h
           handler 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.

SEE ALSO

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