path: root/lib/sasl/doc/src/notes.xml

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

<chapter>
  <header>
    <copyright>
      <year>2004</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 Release Notes</title>
    <prepared>otp_appnotes</prepared>
    <docno>nil</docno>
    <date>nil</date>
    <rev>nil</rev>
    <file>notes.xml</file>
  </header>
  <p>This document describes the changes made to the SASL application.</p>

<section><title>SASL 2.3.4</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    Don't try to add the log_mf_h handler in sasl unless
	    configured to do so. Thanks to Richard Carlsson.</p>
          <p>
	    Own Id: OTP-11464</p>
        </item>
        <item>
          <p>
	    Fix confusing documentation about error handlers in
	    SASL.(Thanks to Richard Carlsson)</p>
          <p>
	    Own Id: OTP-11507</p>
        </item>
        <item>
          <p>
	    A bug in the mechanism for upgrading core parts of
	    Erlang/OTP (emulator, kernel, stdlib, sasl) caused a
	    switch of paths between stdlib and sasl in the
	    intermediate .script/.boot file. The bug was introduces
	    along with this upgrade mechanism in R15B. It has now
	    been corrected. (Thanks to Tobias Schlager)</p>
          <p>
	    Own Id: OTP-11529</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    Added a boot file which skips loading the "$HOME/.erlang"
	    file on startup. Enable by starting erlang with "erl
	    -boot no_dot_erlang".</p>
          <p>
	    *** INCOMPATIBILITY with false ***</p>
          <p>
	    Own Id: OTP-8479 Aux Id: seq11510 </p>
        </item>
      </list>
    </section>

</section>

<section><title>SASL 2.3.3</title>

    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    Add Fd usage in rb logging. Thanks to Eric Pailleau.</p>
          <p>
	    Own Id: OTP-11252</p>
        </item>
      </list>
    </section>

</section>

<section><title>SASL 2.3.2</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    Fix receive support in erl_eval with a BEAM module.
	    Thanks to Anthony Ramine.</p>
          <p>
	    Own Id: OTP-11137</p>
        </item>
      </list>
    </section>

</section>

<section><title>SASL 2.3.1</title>

    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    Some updates are made to systools and release_handler for
	    handling of unicode.</p>
          <p>
	    Own Id: OTP-10782</p>
        </item>
      </list>
    </section>

</section>

<section><title>SASL 2.3</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    release_handler_SUITE:otp_9864 deleted parts of the
	    release_handler_SUITE_data directory so the test suite
	    could not be executed twice without re-installation. This
	    has been corrected.</p>
          <p>
	    Own Id: OTP-10394 Aux Id: kunagi-187 [98] </p>
        </item>
        <item>
          <p>
	    It is no longer possible to have <c>{Mod,Vsn}</c> in the
	    'modules' list in a .app file.</p>
          <p>
	    This was earlier possible, although never documented in
	    the .app file reference manual. It was however visible in
	    the documentation of <c>application:load/[1,2]</c>, where
	    the same term as in a .app file can be used as the first
	    argument.</p>
          <p>
	    The possibility has been removed since the <c>Vsn</c>
	    part was never used.</p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-10417</p>
        </item>
        <item>
          <p>
	    release_handler:upgrade_script and
	    release_handler:downgrade_script could not read appup
	    files with regexps. This has been corrected. (Thanks to
	    Ulf Wiger)</p>
          <p>
	    Own Id: OTP-10463</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
	    <p>Where necessary a comment stating encoding has been
	    added to Erlang files. The comment is meant to be removed
	    in Erlang/OTP R17B when UTF-8 becomes the default
	    encoding. </p>
          <p>
	    Own Id: OTP-10630</p>
        </item>
      </list>
    </section>

</section>

<section><title>SASL 2.2.1</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    If sys.config existed, but was not readable or parseable,
	    this would not be detected until after the upgrade and at
	    the next node restart. The possibility for this to happen
	    is now reduced by adding a check to systools:make_tar
	    which fails the creation of the tar file if sys.config or
	    relup does not have reasonable contents. Note that there
	    are no detailed checks, only parsing and erlang term
	    format check.</p>
          <p>
	    Own Id: OTP-9539</p>
        </item>
        <item>
          <p>
	    systools:make_script would allow {kernel,Vsn,load} in the
	    .rel file, causing a .boot file which only loaded kernel
	    and did not start it. This has been corrected. Only start
	    type 'permanent', which is the default, is now allowed
	    for kernel and stdlib.</p>
          <p>
	    Own Id: OTP-9652</p>
        </item>
        <item>
          <p>
	    release_handler:remove_release/1 now handles symlinked
	    files properly</p>
          <p>
	    Own Id: OTP-9864</p>
        </item>
        <item>
          <p>
	    If stdlib was stated with a start type different from
	    <c>permanent</c> in a .rel file, systools would
	    incorrectly say that sasl had faulty start type. This has
	    been corrected.</p>
          <p>
	    Own Id: OTP-9888</p>
        </item>
        <item>
          <p>
	    Sasl documentation earlier said that the InclApps
	    parameters in a .rel file defaults to the empty list.
	    This is not correct. It defaults to the same value as
	    specified in the .app file. This has been corrected.</p>
          <p>
	    Own Id: OTP-9980</p>
        </item>
        <item>
          <p>
	    Applications that are listed in
	    <c>{applications,Apps}</c> in the .app file were not
	    sorted correctly by <c>systools:make_script/1,2</c>. They
	    got the reverse order of how they were listed in the .app
	    file. This is corrected so they are now sorted
	    (internally between each other) in the same order as they
	    are listed in the .rel file (i.e. the order they are
	    listed in the .app file does no longer matter).</p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-9984</p>
        </item>
        <item>
          <p>
	    Documentation of .appup files now also states that
	    <c>UpFromVsn</c> and <c>DownToVsn</c> can be specified as
	    regular expressions in order to avoid duplicated upgrade
	    instructions.</p>
          <p>
	    Own Id: OTP-10001</p>
        </item>
        <item>
          <p>
	    Reltool would sometimes generate a .app file containing
	    <c>{start_phases,undefined}</c>, which would cause an
	    exception in systools at parse time. This has been
	    corrected so reltool now omits the <c>start_phases</c>
	    entry if the value is <c>undefined</c>. (Thanks to Juan
	    Jose Comellas)</p>
          <p>
	    In order to align with reltool, sasl will also omit
	    <c>start_phases</c> entries with value <c>undefined</c>
	    in .script files.</p>
          <p>
	    Own Id: OTP-10003</p>
        </item>
      </list>
    </section>

</section>

<section><title>SASL 2.2</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    Fix the mechanism for upgrading emulator.</p>
          <p>
	    The appup files for kernel, stdlib and sasl do now
	    recognize two major releases back and include a
	    'restart_new_emulator' instruction. </p>
          <p>
	    Appup files can include regular expressions for matching
	    earlier releases.</p>
          <p>
	    The mechanism for upgrading the emulator is changed so
	    'restart_new_emulator' will be the first instruction
	    executed. The rest of the upgrade instruction will be
	    executed after the emulator restart.</p>
          <p>
	    A new upgrade instruction 'restart_emulator' is added for
	    the case where the emulator shall be restarted after all
	    other upgrade instructions.</p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-9438</p>
        </item>
        <item>
          <p>
	    Add release_handler:which_releases/1</p>
          <p>
	    This is an extension to which_releases that allows a user
	    to specify the status of the releases they wish to be
	    returned. For instance it allows for quickly determining
	    which release is 'permanent' without the need of parsing
	    the entire release list. (Thanks to Joe Williams)</p>
          <p>
	    Own Id: OTP-9717</p>
        </item>
        <item>
          <p>
	    Add copy of rel file in releases/Vsn in release tar file</p>
          <p>
	    systool:make_tar stores the rel file in the releases
	    directory. When unpacking with
	    release_handler:unpack_release, the file is automatically
	    moved to releases/Vsn/. If, however, the tar file is
	    unpacked manually, the rel file might not be moved, and
	    the next release unpacked might overwrite the rel file.
	    To overcome this, systools:make_tar now stores a copy of
	    the rel file in releases/Vsn/ directly and it is not
	    longer necessary to move the file after unpacking.</p>
          <p>
	    The reason for keeping the file in the releases directory
	    also is that is needs to be extracted separately before
	    the release version (Vsn) is known.</p>
          <p>
	    Own Id: OTP-9746</p>
        </item>
      </list>
    </section>

</section>

<section><title>SASL 2.1.10</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    The release_handler functionality on windows services was
	    broken. This has been corrected.</p>
          <p>
	    Own Id: OTP-9306</p>
        </item>
        <item>
          <p>
	    If a new version of an application did not include any
	    erlang module changes, the code path of the application
	    was not updated by the release_handler unless a
	    'load_object_code' instruction was added for the
	    application. This would be a problem if e.g. only some
	    files in the priv dir were changed since calls to
	    code:lib_dir or code:priv_dir would then point to the old
	    location of the application. This has been corrected -
	    now code:replace_path/2 will be called for all
	    applications that are changed (i.e. when the
	    application's vsn is changed in the .rel file).</p>
          <p>
	    Own Id: OTP-9402</p>
        </item>
        <item>
          <p>
	    The appup instruction 'delete_module' would cause a crash
	    during upgrade if the module to be deleted was not
	    loaded. This has been corrected.</p>
          <p>
	    Own Id: OTP-9417</p>
        </item>
        <item>
          <p>
	    If a path was given as ONLY 'ebin' and not for example
	    './ebin', then systools:make_tar would fail with a
	    <c>function_clause</c> exception in filename:join/1. This
	    has been corrected. (Thanks to Nikola Skoric for
	    reporting).</p>
          <p>
	    Own Id: OTP-9507</p>
        </item>
        <item>
          <p>
	    Implement or fix -Werror option</p>
          <p>
	    If -Werror is enabled and there are warnings no output
	    file is written. Also make sure that error/warning
	    reporting is consistent. (Thanks to Tuncer Ayaz)</p>
          <p>
	    Own Id: OTP-9536</p>
        </item>
        <item>
          <p>
	    Improved error information for timeouts during
	    release_handler:install_release.</p>
          <p>
	    This patch addresses two cases where a timeout will occur
	    during upgrade. 1) if a supervisor is suspended (call to
	    get children from supervisor will hang) 2) if the child
	    spec for a supervisor incorrectly states that it is a
	    worker with a dynamic set of modules (call to get modules
	    from gen_event will hang)</p>
          <p>
	    An error report will now be printed, and the return value
	    of release_handler:install_release will indicate what
	    happened. (Thanks to joe williams)</p>
          <p>
	    Own Id: OTP-9546</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    <c>release_handler:install_release</c> could be very slow
	    when there are many processes in the system. Some
	    optimization work has been done both in erts and in the
	    release handler in order to improve this. </p>
          <p>
	    A new option, <c>purge</c>, is added to
	    <c>release_handler:check_install_release</c> which can be
	    called first in order to speed up the execution of
	    <c>release_handler:install_release</c>.</p>
          <p>
	    Own Id: OTP-9395</p>
        </item>
      </list>
    </section>

</section>

<section><title>SASL 2.1.9.4</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    Remove traces of release_handler reading from filesystem
	    when it has Masters list</p>
          <p>
	    There are a couple of places in release_handler and
	    release_handler_1 that assumed it has a disk to read
	    from, which in the case of an erl_prim_loader Loader
	    other than efile is not necessarily true</p>
          <p>
	    Add check_paths/2 to do the equivalent of check_path/1
	    for when there is a Masters list</p>
          <p>
	    Change get_vsn to no longer get sent File paths but
	    instead use the Bin since beam_lib:version being sent a
	    file path causes it to read the local file system</p>
          <p>
	    Add get_current_vsn/1 as an equivalent to
	    beam_lib:version(code:which(Mod)), but using
	    erl_prim_loader:get_file instead of reading from local
	    file system</p>
          <p>
	    (Thanks to Steven Gravell)</p>
          <p>
	    Own Id: OTP-9142</p>
        </item>
        <item>
          <p>
	    rb:stop did sometimes return {error,running}. This came
	    from supervisor:delete_child and happened when the
	    rb_server has not yet terminated when this function was
	    called. Instead of having a separate gen_server call to
	    rb_server for stopping the process,
	    supervisor:terminate_child is now called. This is a
	    synchronous function - i.e. it waits for the process to
	    actually terminate before it returns.</p>
          <p>
	    A file descriptor leak in rb:scan_files is corrected. The
	    index file was never closed after reading.</p>
          <p>
	    A mismatch in the behavior of rb:filter, when filter
	    included 'no', is corrected. Such filters will now return
	    *all* non-matching reports, not only the 'proplist'
	    reports.</p>
          <p>
	    Own Id: OTP-9149</p>
        </item>
        <item>
          <p>
	    Start and end date for rb:filter/2 was specified as
	    {{Y-M-D},...} in the help text instead of {{Y,M,D},...}.
	    This has been corrected.</p>
          <p>
	    Own Id: OTP-9166</p>
        </item>
        <item>
          <p>
	    If some, but not all, of the sasl environment variables
	    related to the log_mf_h error handler were missing sasl
	    would successfully start but silently skip starting
	    log_mf_h. This is corrected so sasl startup will now fail
	    if one or two of the three variables are given. If none
	    of the variables are given, sasl will start as before
	    without starting log_mf_h.</p>
          <p>
	    Own Id: OTP-9185</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    Change default behaviour to not check src code when
	    creating release</p>
          <p>
	    Add new option <c>src_tests</c> to systools:make_script
	    and systools:make_tar. The old option
	    <c>no_module_tests</c> is now ignored as this is the
	    default behaviour.</p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-9146 Aux Id: seq11803 </p>
        </item>
      </list>
    </section>

</section>

<section><title>SASL 2.1.9.3</title>

    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    Honor start type in .rel files when building relup files</p>
          <p>
	    Previously, relup file always included an
	    application:start(Application, permanent) apply
	    instruction for every application that appear in the
	    UpTo/DowFrom release file, whatever their start type in
	    the release file.</p>
          <p>
	    The new implementation fixes this bug by honoring the
	    start type according to the rel(5) format. If the start
	    type is none, no apply line is included in the relup. If
	    the start type is load, the relup includes instruction to
	    only load the application. Otherwise, the relup includes
	    an instruction to start the application to the according
	    type.</p>
          <p>
	    The fix is implemented by adding a new parameter to the
	    add_application high level appup instruction. This new
	    parameter is documented in appup(5).</p>
          <p>
	    Own Id: OTP-9097</p>
        </item>
      </list>
    </section>

</section>

<section><title>SASL 2.1.9.2</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
	    <p>In R13B04 sys:get_status was modified to invoke
	    format_status/2 in the callback module if the module
	    exports that function. This resulted in a change to the
	    term returned from calling sys:get_status on the
	    supervisor module, since supervisor is a gen_server and
	    gen_server exports format_status. The sasl
	    release_handler_1 module had a dependency on the
	    pre-R13B04 term returned by sys:get_status when invoked
	    on a supervisor, so the R13B04 change broke that
	    dependency.</p>
	    <p>This problem has been fixed by change
	    release_handler_1 to handle both the pre-R13B04 and
	    R13B04 terms that sys:get_status can return from a
	    supervisor.</p>
          <p>
	    Own Id: OTP-8619 Aux Id: seq11570 </p>
        </item>
      </list>
    </section>

</section>

<section><title>SASL 2.1.9.1</title>

    <section><title>Improvements and New Features</title>
      <list>
        <item>
	    <p>Use an infinity timeout in all calls to
	    <c>gen_server:call()</c> in the <c>sasl</c>
	    application.</p>
          <p>
	    Own Id: OTP-8506 Aux Id: seq11509 </p>
        </item>
      </list>
    </section>

</section>

<section><title>SASL 2.1.9</title>

    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    The <c>re:grep/1</c> function now uses the '<c>re</c>'
	    module instead of the deprecated '<c>regexp</c>' module.
	    There are new functions <c>rb:filter/1</c> and
	    <c>rb:filter/2</c> for easier filtering of reports.
	    (Thanks to Alvaro Videla.)</p>
          <p>
	    Own Id: OTP-8443</p>
        </item>
        <item>
          <p>
	    There is new function <c>sasl_report:format_report/3</c>
	    that works like the existing
	    <c>sasl_report:write_report/3</c> function except that it
	    returns a formatted string. Note that there is currently
	    no documentation for the <c>sasl_report</c> module.
	    (Thanks to Jay Nelson.)</p>
          <p>
	    Own Id: OTP-8445</p>
        </item>
        <item>
          <p>
	    Cleanups suggested by tidier and modernization of types
	    and specs.</p>
          <p>
	    Own Id: OTP-8455</p>
        </item>
      </list>
    </section>

</section>

<section><title>SASL 2.1.8</title>

    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    The documentation is now built with open source tools
	    (xsltproc and fop) that exists on most platforms. One
	    visible change is that the frames are removed.</p>
          <p>
	    Own Id: OTP-8201</p>
        </item>
      </list>
    </section>

</section>

<section><title>SASL 2.1.7</title>

    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    The Windows utility Erlsrv, run in interactive mode now
	    accepts options for registering internal service name and
	    description field of Windows registry database.</p>
          <p>
	    Own Id: OTP-8132</p>
        </item>
      </list>
    </section>

</section>

<section><title>SASL 2.1.6</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
	    <p>When using the SASL application configuration
	    parameter <c>masters</c> the error tuple
	    <c>{error,{no_such_file,{Master,FileName}}}</c> was
	    sometimes returned even though the file <c>FileName</c>
	    existed.</p>
          <p>
	    Own Id: OTP-7667</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    Missing preloaded modules added</p>
          <p>
	    Own Id: OTP-7820</p>
        </item>
      </list>
    </section>

</section>

<section><title>SASL 2.1.5.4</title>

    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    A Dialyzer warning was eliminated</p>
          <p>
	    Own Id: OTP-7635</p>
        </item>
      </list>
    </section>

</section>

<section><title>SASL 2.1.5.3</title>

    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    Minor changes.</p>
          <p>
	    Own Id: OTP-7388</p>
        </item>
      </list>
    </section>

</section>

<section><title>SASL 2.1.5.2</title>

    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    Minor updates.</p>
          <p>
	    Own Id: OTP-6998</p>
        </item>
      </list>
    </section>

</section>
  <section>
    <title>SASL 2.1.5.1</title>

    <section>
      <title>Improvements and New Features</title>
      <list type="bulleted">
        <item>
          <p>Minor Makefile changes.</p>
          <p>Own Id: OTP-6689</p>
        </item>
        <item>
          <p>Obsolete guard tests (such as list()) have been replaced
            with the modern guard tests (such as is_list()).</p>
          <p>Own Id: OTP-6725</p>
        </item>
      </list>
    </section>
  </section>

  <section>
    <title>SASL 2.1.5</title>

    <section>
      <title>Fixed Bugs and Malfunctions</title>
      <list type="bulleted">
        <item>
          <p>Removed some dead code from <c>erlsrv:get_service/2</c>,
            <c>release_handler:do_write_file/2</c>,
            <c>systools_relup:foreach_baserel_up/7</c> and
            <c>systools_relup:foreach_baserel_dn/7</c>.</p>
          <p>Own Id: OTP-6499</p>
        </item>
      </list>
    </section>
  </section>

  <section>
    <title>SASL 2.1.4</title>

    <section>
      <title>Improvements and New Features</title>
      <list type="bulleted">
        <item>
          <p>Added an option <c>{outdir,Dir}</c> to the functions in
            <c>systools</c>, making it possible to specify in which
            directory a boot script, relup file or release package
            file should be placed.</p>
          <p>Also, when using <c>systools:make_tar/2</c> to create a
            release package file, the boot script, relup file and
            <c>sys.config</c> are now searched for also in the current
            working directory and any directory specified by
            the <c>path</c> option, not only in the directory of
            the <c>.rel</c> file.</p>
          <p>As part of the work some minor bugs have been corrected:</p>
          <list type="bulleted">
            <item>
              <p><c>systools:make_script/1,2</c> now returns
                <c>error</c> if the <c>.script</c> and/or <c>.boot</c>
                file could not be opened for writing, not <c>ok</c>.</p>
            </item>
            <item>
              <p><c>systools:make_tar/1,2</c> can now handle a
                <c>RelName</c> argument which includes a path.
                Previously this would cause the <c>.rel</c> file to end
                up in the wrong directory in the resulting tar file.</p>
            </item>
            <item>
              <p>A documentation error for <c>systools:make_tar/1,2</c>:
                The <c>.rel</c> file is placed in the <c>releases</c>
                directory in the tar file, not <c>releases/RelVsn</c>.</p>
            </item>
          </list>
          <p>Own Id: OTP-6226</p>
        </item>
      </list>
    </section>
  </section>

  <section>
    <title>SASL 2.1.3</title>

    <section>
      <title>Fixed Bugs and Malfunctions</title>
      <list type="bulleted">
        <item>
          <p><c>release_handler:upgrade_app/2</c> and
            <c>release_handler:downgrade_app/2,3</c> -- used for
            testing application upgrade and downgrade according to
            the <c>.appup</c> file -- now update application
            configuration parameters correctly. (Thanks to Serge
            Aleynikov)</p>
          <p>Own Id: OTP-6162</p>
        </item>
      </list>
    </section>
  </section>

  <section>
    <title>SASL 2.1.2</title>

    <section>
      <title>Fixed Bugs and Malfunctions</title>
      <list type="bulleted">
        <item>
          <p>Fixed some minor bugs in <c>release_handler</c> found by
            Dialyzer.</p>
          <p>Own Id: OTP-6039</p>
        </item>
      </list>
    </section>
  </section>

  <section>
    <title>SASL 2.1.1</title>

    <section>
      <title>Improvements and New Features</title>
      <list type="bulleted">
        <item>
          <p>Added a number of functions to <c>release_handler</c> which
            makes it possible to test upgrade and downgrade of
            applications according to an <c>.appup</c> file "on the
            fly":            <br></br>

            - <c>upgrade_app/2</c>            <br></br>

            - <c>upgrade_script/2</c>            <br></br>

            - <c>downgrade_app/2,3</c>            <br></br>

            - <c>downgrade_script/3</c>            <br></br>

            - <c>eval_appup_script/4</c></p>
          <p>Own Id: OTP-5858</p>
        </item>
      </list>
    </section>
  </section>

  <section>
    <title>SASL 2.1</title>

    <section>
      <title>Improvements and New Features</title>
      <list type="bulleted">
        <item>
          <p>A new option <c>{update_paths,Bool}</c> has been added
            for <c>release_handler:install_release/2</c>. It
            indicates if all application code paths should be updated
            (<c>Bool==true</c>), or if only code paths for modified
            applications should be updated (<c>Bool==false</c>,
            default).</p>
          <p><c>release_handler:set_unpacked/2</c> now returns an
            error tuple if a specified application directory does not
            exist.</p>
          <p>*** POTENTIAL INCOMPATIBILITY ***</p>
          <p>Own Id: OTP-5761</p>
        </item>
      </list>
    </section>
  </section>

  <section>
    <title>SASL 2.0.1</title>

    <section>
      <title>Improvements and New Features</title>
      <list type="bulleted">
        <item>
          <p>A bug that made it impossible to call <c>rb:show(N)</c>
            (<c>N</c> being an integer) twice without getting an error
            has been fixed.</p>
          <p>Own Id: OTP-5287</p>
        </item>
      </list>
    </section>
  </section>
</chapter>