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<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE appref SYSTEM "appref.dtd">
<appref>
<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.
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>The SASL application provides the following services:</p>
<list type="bulleted">
<item><c>alarm_handler</c></item>
<item><c>release_handler</c></item>
<item><c>systools</c></item>
</list>
<note>
<p>The SASL application in OTP has nothing to do with
"Simple Authentication and Security Layer" (RFC 4422).</p>
</note>
</description>
<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[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>
</taglist>
</section>
<section>
<title>Deprecated Error Logger Event Handlers and Configuration</title>
<p>In OTP-21, a new API for logging was added to Erlang/OTP. The
old <c>error_logger</c> event manager, and event handlers
running on this manager, will still work, but they are not used
by default.</p>
<p>The error logger event handlers <c>sasl_report_tty_h</c>
and <c>sasl_report_file_h</c>, were earliger used for printing
the so called SASL reports, i.e. <em>supervisor
reports</em>, <em>crash reports</em>, and <em>progress
reports</em>. These reports are now also printed by the standard
logger handler started by the Kernel application. Progress
reports are by default stopped by a filter, but can easily be
added by setting the Kernel configuration
parameter <seealso marker="kernel:kernel_app#logger_log_progress"><c>logger_log_progress=true</c></seealso>.</p>
<p>If the old error logger event handlers are still desired, they
must be added by
calling <c>error_logger:add_report_handler/1,2</c>.</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#deprecated-configuration-parameters"><c>error_logger_format_depth</c></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#deprecated-configuration-parameters"><c>error_logger_format_depth</c></seealso>
in the Kernel application to limit the details printed in
crash and supervisor reports.</p>
</item>
</taglist>
<p>A similar behaviour, but still using the new logger API, can be
obtained by setting the Kernel application environment
variable <seealso marker="kernel:kernel_app#logger_sasl_compatible"><c>logger_sasl_compatible=true</c></seealso>. This will add a
second instance of the standard logger handler
named <c>sasl_h</c>, which will only print the SASL reports. No
SASL reports will then be printed by the Kernel logger
handler.</p>
<p>The <c>sasl_h</c> handler will be configured according to the
values of the following SASL application environment
variables.</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. The file is opened in <c>write</c> mode with encoding
<c>utf8</c>.</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. By default, the file is opened in <c>write</c> mode
with encoding <c>utf8</c>. Use <c>[append]</c> to have
the <c>FileName</c> open in append mode. A different
encoding can also be specified.
<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><marker id="utc_log"/><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>
<p>The error logger event handler <c>log_mf_h</c> can also still
be used. This event handler 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:</p>
<taglist>
<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>
</taglist>
<p>The new <seealso marker="kernel:logger_disk_log_h">
<c>logger_disk_log_h</c></seealso> might be an alternative
to <c>log_mf_h</c> if log rotation is desired. This does,
however, write the log events in clear text and not as binaries.</p>
</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>
</appref>
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