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<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE appref SYSTEM "appref.dtd">

<appref>
  <header>
    <copyright>
      <year>1996</year><year>2013</year>
      <holder>Ericsson AB. All Rights Reserved.</holder>
    </copyright>
    <legalnotice>
      The contents of this file are subject to the Erlang Public License,
      Version 1.1, (the "License"); you may not use this file except in
      compliance with the License. You should have received a copy of the
      Erlang Public License along with this software. If not, it can be
      retrieved online at http://www.erlang.org/.
    
      Software distributed under the License is distributed on an "AS IS"
      basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
      the License for the specific language governing rights and limitations
      under the License.
    
    </legalnotice>

    <title>sasl</title>
    <prepared></prepared>
    <docno></docno>
    <date></date>
    <rev></rev>
  </header>
  <app>sasl</app>
  <appsummary>The SASL Application</appsummary>
  <description>
    <p>This section describes the SASL (System Architecture Support Libraries)
      application which provides the following services:</p>
    <list type="bulleted">
      <item><c>alarm_handler</c></item>
      <item><c>overload</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 defined in
      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>.</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.</p>
      </item>
      <tag><c>error_logger_mf_h</c></tag>
      <item>
        <p>This error logger writes <em>all</em> events sent to
          the error logger to disk. It installs the <c>log_mf_h</c>
          event handler in the <c>error_logger</c> process.</p>
        <p>To activate this event handler, the following 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>. See below for 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. See <c>app(4)</c> for more information about
      configuration parameters:</p>
    <taglist>
      <tag><c><![CDATA[sasl_error_logger = Value <optional>]]></c></tag>
      <item>
        <p><c>Value</c> is one of:</p>
        <taglist>
          <tag><c>tty</c></tag>
          <item>Installs <c>sasl_report_tty_h</c> in the error logger.
           This is the default option.</item>
          <tag><c>{file,FileName}</c></tag>
          <item>Installs <c>sasl_report_file_h</c> in the error logger.
           This makes all reports go to the file <c>FileName</c>.
          <c>FileName</c> is a string.</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 <optional>]]></c></tag>
      <item>
        <p>Restricts the error logging performed by the specified
          <c>sasl_error_logger</c> to error reports, progress reports,
          or both. Default is <c>all</c>.</p>
      </item>
      <tag><c><![CDATA[error_logger_mf_dir = string() | false<optional>]]></c></tag>
      <item>
        <p>Specifies in which directory the files are stored. If this
          parameter is undefined or <c>false</c>,
          the <c>error_logger_mf_h</c> is not installed.</p>
      </item>
      <tag><c><![CDATA[error_logger_mf_maxbytes = integer() <optional>]]></c></tag>
      <item>
        <p>Specifies how large each individual file can be. If this
          parameter is undefined, the <c>error_logger_mf_h</c> is not
          installed.</p>
      </item>
      <tag><c><![CDATA[error_logger_mf_maxfiles = 0<integer()<256 <optional>]]></c></tag>
      <item>
        <p>Specifies how many files are used. If this parameter is
          undefined, the <c>error_logger_mf_h</c> is not installed.</p>
      </item>
      <tag><c><![CDATA[overload_max_intensity = float() > 0 <optional>]]></c></tag>
      <item>
        <p>Specifies the maximum intensity for <c>overload</c>. Default
          is <c>0.8</c>.</p>
      </item>
      <tag><c><![CDATA[overload_weight = float() > 0 <optional>]]></c></tag>
      <item>
        <p>Specifies the <c>overload</c> weight. Default is <c>0.1</c>.</p>
      </item>
      <tag><c><![CDATA[start_prg = string() <optional>]]></c></tag>
      <item>
        <p>Specifies which program should be used when restarting
          the system. Default is <c>$OTP_ROOT/bin/start</c>.</p>
      </item>
      <tag><c><![CDATA[masters = [atom()] <optional>]]></c></tag>
      <item>
        <p>Specifies which nodes this node uses to read/write release
          information. This parameter is ignored if
          the <c>client_directory</c> parameter is not set.</p>
      </item>
      <tag><c><![CDATA[client_directory = string() <optional>]]></c></tag>
      <item>
        <p>This parameter specifies the client directory at the master
          nodes. Refer to Release Handling in <em>OTP Design Principles</em> for more information.  This parameter is
          ignored if the <c>masters</c> parameter is not set.</p>
      </item>
      <tag><c><![CDATA[static_emulator = true | false <optional>]]></c></tag>
      <item>
        <p>Indicates if the Erlang emulator is statically installed. A
          node with a static emulator cannot switch dynamically to a
          new emulator as the executable files are written into memory
          statically.  This parameter is ignored if the <c>masters</c>
          and <c>client_directory</c> parameters are not set.</p>
      </item>
      <tag><c><![CDATA[releases_dir = string() <optional>]]></c></tag>
      <item>
        <p>Indicates where the <c>releases</c> directory is located.
          The release handler writes all its files to this directory.
          If this parameter is not set, the OS environment parameter
          <c>RELDIR</c> is used. By default, this is
          <c>$OTP_ROOT/releases</c>.</p>
      </item>
      <tag><c><![CDATA[utc_log = true | false <optional>]]></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">alarm_handler(3)</seealso>,
      error_logger(3),
      log_mf_h(3),
      <seealso marker="overload">overload(3)</seealso>,
      <seealso marker="rb">rb(3)</seealso>,
      <seealso marker="release_handler">release_handler(3)</seealso>,
      <seealso marker="systools">systools(3)</seealso></p>
  </section>
</appref>