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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>
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
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
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 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 will use
<seealso marker="kernel:kernel_app#error_logger_format_depth">error_logger_format_depth</seealso>
in the Kernel application to limit how much detail are printed to
for 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 will use
<seealso marker="kernel:kernel_app#error_logger_format_depth">error_logger_format_depth</seealso>
in the Kernel application to limit how much detail are printed to
for 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.</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>{file,FileName,Modes}</c></tag>
<item>Same as <c>{file,FileName}</c> except that the <c>Modes</c>
allows 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, the <c>Modes</c> defaults to <c>[write]</c>.
Use <c>[append]</c> for having the <c>FileName</c> open in append mode.
<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>log_mf_h</c> handler 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>log_mf_h</c> handler 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>log_mf_h</c> handler 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>
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