# sasl

### APPLICATION

sasl

### APPLICATION SUMMARY

The SASL Application

### DESCRIPTION

This section describes the SASL 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.

### Error Logger Event Handlers

The following error logger event handlers are defined in 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.
`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` process.

### Configuration

The following configuration parameters are defined for the SASL application. See `app(4)` 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 `error_logger_mf_h` is not installed.
`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.

### See Also

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

### AUTHORS

Martin Björklund - support@erlang.ericsson.se

sasl 2.1.3
Copyright © 1991-2006 Ericsson AB