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  <header>
    <copyright>
      <year>1996</year><year>2016</year>
      <holder>Ericsson AB. All Rights Reserved.</holder>
    </copyright>
    <legalnotice>
      Licensed under the Apache License, Version 2.0 (the "License");
      you may not use this file except in compliance with the License.
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          http://www.apache.org/licenses/LICENSE-2.0

      Unless required by applicable law or agreed to in writing, software
      distributed under the License is distributed on an "AS IS" BASIS,
      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
      See the License for the specific language governing permissions and
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    </legalnotice>

    <title>sasl</title>
    <prepared></prepared>
    <docno></docno>
    <date></date>
    <rev></rev>
    </header>
    <app>sasl</app>
    <appsummary>The SASL application</appsummary>
    <description>
    <p>The SASL application provides the following services:</p>
    <list type="bulleted">
      <item><c>alarm_handler</c></item>
      <item><c>rb</c></item>
      <item><c>release_handler</c></item>
      <item><c>systools</c></item>
    </list>
    <p>The SASL application also includes <c>error_logger</c> event
      handlers for formatting SASL error and crash reports.</p>
    <note>
       <p>The SASL application in OTP has nothing to do with
          "Simple Authentication and Security Layer" (RFC 4422).</p>
    </note>
  </description>

  <section>
    <title>Error Logger Event Handlers</title>
    <p>The following error logger event handlers are used by
      the SASL application.</p>
    <taglist>
      <tag><c>sasl_report_tty_h</c></tag>
      <item>
        <p>Formats and writes <em>supervisor reports</em>, <em>crash
        reports</em>, and <em>progress reports</em> to <c>stdio</c>.
        This error logger event handler uses
	<seealso marker="kernel:kernel_app#error_logger_format_depth">error_logger_format_depth</seealso>
	in the Kernel application to limit how much detail is
        printed in crash and supervisor reports.</p>
      </item>
      <tag><c>sasl_report_file_h</c></tag>
      <item>
        <p>Formats and writes <em>supervisor reports</em>, <em>crash
        report</em>, and <em>progress report</em> to a single file.
        This error logger event handler uses
	<seealso marker="kernel:kernel_app#error_logger_format_depth">error_logger_format_depth</seealso>
	in the Kernel application to limit the details
        printed in crash and supervisor reports.</p>
      </item>
      <tag><c>log_mf_h</c></tag>
      <item>
        <p>This error logger writes <em>all</em> events sent to the
          error logger to disk. Multiple files and log rotation are
          used. For efficiency reasons, each event is written as a
          binary. For more information about this handler,
          see <seealso marker="stdlib:log_mf_h">the STDLIB Reference
          Manual</seealso>.</p>
        <p>To activate this event handler, three SASL
          configuration parameters must be set,
          <c>error_logger_mf_dir</c>, <c>error_logger_mf_maxbytes</c>,
          and <c>error_logger_mf_maxfiles</c>. The next section provides
          more information about the configuration parameters.</p>
      </item>
    </taglist>
  </section>

  <section>
    <title>Configuration</title>
    <p>The following configuration parameters are defined for the SASL
      application. For more information about configuration parameters, see
      <seealso marker="kernel:app"><c>app(4)</c></seealso> in Kernel.</p>
    <p>All configuration parameters are optional.</p>
    <taglist>
      <tag><c><![CDATA[sasl_error_logger = Value ]]></c></tag>
      <item>
        <p><c>Value</c> is one of the following:</p>
        <taglist>
          <tag><c>tty</c></tag>
          <item><p>Installs <c>sasl_report_tty_h</c> in the error logger.
            This is the default option.</p></item>
          <tag><c>{file,FileName}</c></tag>
          <item><p>Installs <c>sasl_report_file_h</c> in the error logger.
            All reports go to file <c>FileName</c>, which is a
            string.</p></item>
          <tag><c>{file,FileName,Modes}</c></tag>
          <item><p>Same as <c>{file,FileName}</c>, except that <c>Modes</c>
            allows you to specify the modes used for opening the <c>FileName</c>
            given to the <seealso marker="kernel:file#open/2">file:open/2</seealso>
            call. When not specified, <c>Modes</c> defaults to <c>[write]</c>.
            Use <c>[append]</c> to have the <c>FileName</c> open in append mode.
            <c>FileName</c> is a string.</p></item>
          <tag><c>false</c></tag>
          <item><p>No SASL error logger handler is installed.</p></item>
        </taglist>
      </item>
      <tag><c><![CDATA[errlog_type = error | progress | all ]]></c></tag>
      <item>
        <p>Restricts the error logging performed by the specified
          <c>sasl_error_logger</c> to error reports or progress reports,
          or both. Default is <c>all</c>.</p>
      </item>
      <tag><c><![CDATA[error_logger_mf_dir = string() | false ]]></c></tag>
      <item>
        <p>Specifies in which directory <c>log_mf_h</c> is to store
          its files. If this parameter is undefined or <c>false</c>,
          the <c>log_mf_h</c> handler is not installed.</p>
      </item>
      <tag><c><![CDATA[error_logger_mf_maxbytes = integer() ]]></c></tag>
      <item>
        <p>Specifies the maximum size of each individual file written
          by <c>log_mf_h</c>. If this parameter is undefined,
          the <c>log_mf_h</c> handler is not installed.</p>
      </item>
      <tag><c><![CDATA[error_logger_mf_maxfiles = 0<integer()<256 ]]></c></tag>
      <item>
        <p>Specifies the number of files used by <c>log_mf_h</c>. If
          this parameter is undefined, the <c>log_mf_h</c> handler is
          not installed.</p>
      </item>
      <tag><c><![CDATA[start_prg = string() ]]></c></tag>
      <item>
        <p>Specifies the program to be used when restarting the system
          during release installation. Default is
          <c>$OTP_ROOT/bin/start</c>.</p>
      </item>
      <tag><c><![CDATA[masters = [atom()] ]]></c></tag>
      <item>
        <p>Specifies the nodes used by this node to read/write release
          information. This parameter is ignored if parameter
          <c>client_directory</c> is not set.</p>
      </item>
      <tag><c><![CDATA[client_directory = string() ]]></c></tag>
      <item>
        <p>This parameter specifies the client directory at the master
          nodes. For details, see
          <seealso marker="doc/design_principles:release_handling">Release Handling</seealso>
          in <em>OTP Design Principles</em>. This parameter is
          ignored if parameter <c>masters</c> is not set.</p>
      </item>
      <tag><c><![CDATA[static_emulator = true | false ]]></c></tag>
      <item>
        <p>Indicates if the Erlang emulator is statically installed. A
          node with a static emulator cannot switch dynamically to a
          new emulator, as the executable files are written into memory
          statically. This parameter is ignored if parameters <c>masters</c>
          and <c>client_directory</c> are not set.</p>
      </item>
      <tag><c><![CDATA[releases_dir = string() ]]></c></tag>
      <item>
        <p>Indicates where the <c>releases</c> directory is located.
          The release handler writes all its files to this directory.
          If this parameter is not set, the OS environment parameter
          <c>RELDIR</c> is used. By default, this is
          <c>$OTP_ROOT/releases</c>.</p>
      </item>
      <tag><c><![CDATA[utc_log = true | false ]]></c></tag>
      <item>
        <p>If set to <c>true</c>, all dates in textual log outputs are
          displayed in Universal Coordinated Time with the string
          <c>UTC</c> appended.</p>
      </item>
    </taglist>
  </section>

  <section>
    <title>See Also</title>
    <p><seealso marker="alarm_handler"><c>alarm_handler(3)</c></seealso>,
      <seealso marker="kernel:error_logger"><c>error_logger(3)</c></seealso>,
      <seealso marker="stdlib:log_mf_h"><c>log_mf_h(3)</c></seealso>,
      <seealso marker="rb"><c>rb(3)</c></seealso>,
      <seealso marker="release_handler"><c>release_handler(3)</c></seealso>,
      <seealso marker="systools"><c>systools(3)</c></seealso></p>
  </section>
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