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erlang-doc-R15B-03.3.fc17.noarch.rpm

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<img alt="Erlang logo" src="../../../../doc/erlang-logo.png"><br><small><a href="users_guide.html">User's Guide</a><br><a href="index.html">Reference Manual</a><br><a href="release_notes.html">Release Notes</a><br><a href="../pdf/stdlib-1.18.3.pdf">PDF</a><br><a href="../../../../doc/index.html">Top</a></small><p><strong>STDLIB</strong><br><strong>Reference Manual</strong><br><small>Version 1.18.3</small></p>
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<!-- refpage --><center><h1>sys</h1></center>
  
  <h3>MODULE</h3>
<div class="REFBODY">sys</div>
  <h3>MODULE SUMMARY</h3>
<div class="REFBODY">A Functional Interface to System Messages</div>
  <h3>DESCRIPTION</h3>
<div class="REFBODY"><p>
    <p>This module contains functions for sending system messages used by programs, and messages used for debugging purposes.
      </p>
    <p>Functions used for implementation of processes 
      should also understand system messages such as debugging
      messages and code change. These functions must be used to implement the use of system messages for a process; either directly, or through standard behaviours, such as <span class="code">gen_server</span>.</p>
    <p>The default timeout is 5000 ms, unless otherwise specified. The
      <span class="code">timeout</span> defines the time period to wait for the process to
      respond to a request. If the process does not respond, the
      function evaluates <span class="code">exit({timeout, {M, F, A}})</span>.
      </p>
    <p><a name="dbg_opt"></a>The functions make reference to a debug structure.
      The debug structure is a list of <span class="code">dbg_opt()</span>.
      <span class="code">dbg_opt()</span> is an internal data type used by the
      <span class="code">handle_system_msg/6</span> function. No debugging is performed if it is an empty list.
      </p>
  </p></div>

  <h3><a name="id225128">System Messages</a></h3>
<div class="REFBODY">
    
    <p>Processes which are not implemented as one of the standard
      behaviours must still understand system
      messages. There are three different messages which must be
      understood:
      </p>
    <ul>
      <li>
        <p>Plain system messages. These are received as
          <span class="code">{system, From, Msg}</span>. The content and meaning of
          this message are not interpreted by the
          receiving process module. When a system message has been
          received, the function <span class="code">sys:handle_system_msg/6</span>
          is called in order to handle the request.
          </p>
      </li>
      <li>
        <p>Shutdown messages. If the process traps exits, it must
          be able to handle an shut-down request from its parent, the
          supervisor. The message <span class="code">{'EXIT', Parent, Reason}</span>
          from the parent is an order to terminate.  The process must terminate when this message is received, normally with the
          same <span class="code">Reason</span> as <span class="code">Parent</span>.
          </p>
      </li>
      <li>
        <p>There is one more message which the process must understand if the modules used to implement the process change dynamically during runtime. An example of such a process is the <span class="code">gen_event</span> processes. This message is <span class="code">{get_modules, From}</span>. The reply to this message is <span class="code">From ! {modules, Modules}</span>,
          where <span class="code">Modules</span> is a list of the currently active modules in the process.
          </p>
        <p>This message is used by the release handler to find which
          processes execute a certain module. The process may at a
          later time be suspended and ordered to perform a code change
          for one of its modules.
          </p>
      </li>
    </ul>
  </div>

  <h3><a name="id225214">System Events</a></h3>
<div class="REFBODY">
    
    <p>When debugging a process with the functions of this
      module, the process generates <strong>system_events</strong> which are
      then treated in the debug function. For example, <span class="code">trace</span>
      formats the system events to the tty.
      </p>
    <p>There are three predefined system events which are used when a
      process receives or sends a message. The process can also define its
      own system events. It is always up to the process itself
      to format these events.</p>
  </div>
  <h3>DATA TYPES</h3>
    <p>
      <span class="bold_code"><a name="type-name">name()</a> = pid() | atom() | {global, atom()}</span><br></p>
    <p>
      <span class="bold_code"><a name="type-system_event">system_event()</a> = {in, Msg :: term()}<br>               | {in, Msg :: term(), From :: term()}<br>               | {out, Msg :: term(), To :: term()}<br>               | term()</span><br></p>
    <p>
      <span class="bold_code"><a name="type-dbg_opt">dbg_opt()</a></span><br></p>
<div class="REFBODY"><p><p>See <span class="bold_code"><a href="#dbg_opt">above</a></span>.</p></p></div>
    <p>
      <span class="bold_code"><a name="type-dbg_fun">dbg_fun()</a> = <br>    fun((FuncState :: term(),<br>         Event :: <span class="bold_code"><a href="#type-system_event">system_event()</a></span>,<br>         ProcState :: term()) -&gt;<br>            done | (NewFuncState :: term()))</span><br></p>
  
  <h3>EXPORTS</h3>
    <p><a name="log-2"></a><span class="bold_code">log(Name, Flag) -&gt; ok | {ok, [<span class="bold_code"><a href="#type-system_event">system_event()</a></span>]}</span><br><a name="log-3"></a><span class="bold_code">log(Name, Flag, Timeout) -&gt; ok | {ok, [<span class="bold_code"><a href="#type-system_event">system_event()</a></span>]}</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Name = <span class="bold_code"><a href="#type-name">name()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Flag = true | {true, N :: integer() &gt;= 1} | false | get | print</span></div>
<div class="REFTYPES"><span class="bold_code">Timeout = timeout()</span></div>
</div></p>
<div class="REFBODY"><p>
        <p>Turns the logging of system events On or Off. If On, a
          maximum of <span class="code">N</span>  events are kept in the
          debug structure (the default is 10). If <span class="code">Flag</span> is <span class="code">get</span>, a list of all
          logged events is returned. If <span class="code">Flag</span> is <span class="code">print</span>, the
          logged events are printed to <span class="code">standard_io</span>. The events are
          formatted with a function that is defined by the process that
          generated the event (with a call to
          <span class="code">sys:handle_debug/4</span>).</p>
      </p></div>
    <p><a name="log_to_file-2"></a><span class="bold_code">log_to_file(Name, Flag) -&gt; ok | {error, open_file}</span><br><a name="log_to_file-3"></a><span class="bold_code">log_to_file(Name, Flag, Timeout) -&gt; ok | {error, open_file}</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Name = <span class="bold_code"><a href="#type-name">name()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Flag = (FileName :: string()) | false</span></div>
<div class="REFTYPES"><span class="bold_code">Timeout = timeout()</span></div>
</div></p>
<div class="REFBODY"><p>
        <p>Enables or disables the logging of all system events in textual
          format to the file. The events are formatted with a function that is 
          defined by the process that generated the event (with a call
          to <span class="code">sys:handle_debug/4</span>).</p>
      </p></div>
    <p><a name="statistics-2"></a><span class="bold_code">statistics(Name, Flag) -&gt; ok | {ok, Statistics}</span><br><a name="statistics-3"></a><span class="bold_code">statistics(Name, Flag, Timeout) -&gt; ok | {ok, Statistics}</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Name = <span class="bold_code"><a href="#type-name">name()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Flag = true | false | get</span></div>
<div class="REFTYPES"><span class="bold_code">Statistics = [StatisticsTuple] | no_statistics</span></div>
<div class="REFTYPES"><span class="bold_code">StatisticsTuple = {start_time, DateTime1}<br>                | {current_time, DateTime2}<br>                | {reductions, integer() &gt;= 0}<br>                | {messages_in, integer() &gt;= 0}<br>                | {messages_out, integer() &gt;= 0}</span></div>
<div class="REFTYPES"><span class="bold_code">DateTime1 = DateTime2 = <span class="bold_code"><a href="javascript:erlhref('../../../../doc/../','kernel','file.html#type-date_time');">file:date_time()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code">Timeout = timeout()</span></div>
</div></p>
<div class="REFBODY"><p>
        <p>Enables or disables the collection of statistics. If <span class="code">Flag</span> is
          <span class="code">get</span>, the statistical collection is returned.</p>
      </p></div>
    <p><a name="trace-2"></a><span class="bold_code">trace(Name, Flag) -&gt; ok</span><br><a name="trace-3"></a><span class="bold_code">trace(Name, Flag, Timeout) -&gt; ok</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Name = <span class="bold_code"><a href="#type-name">name()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Flag = boolean()</span></div>
<div class="REFTYPES"><span class="bold_code">Timeout = timeout()</span></div>
</div></p>
<div class="REFBODY"><p>
        <p>Prints all system events on <span class="code">standard_io</span>. The events are
          formatted with a function that is defined by the process that
          generated the event (with a call to
          <span class="code">sys:handle_debug/4</span>).</p>
      </p></div>
    <p><a name="no_debug-1"></a><span class="bold_code">no_debug(Name) -&gt; ok</span><br><a name="no_debug-2"></a><span class="bold_code">no_debug(Name, Timeout) -&gt; ok</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Name = <span class="bold_code"><a href="#type-name">name()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Timeout = timeout()</span></div>
</div></p>
<div class="REFBODY"><p>
        <p>Turns off all debugging for the process. This includes
          functions that have been installed explicitly with the
          <span class="code">install</span> function, for example triggers.</p>
      </p></div>
    <p><a name="suspend-1"></a><span class="bold_code">suspend(Name) -&gt; Void</span><br><a name="suspend-2"></a><span class="bold_code">suspend(Name, Timeout) -&gt; Void</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Name = <span class="bold_code"><a href="#type-name">name()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Timeout = timeout()</span></div>
<div class="REFTYPES"><span class="bold_code">Void = term()</span></div>
</div></p>
<div class="REFBODY"><p>
        <p>Suspends the process. When the process is suspended, it
          will only respond to other system messages, but not other
          messages.</p>
      </p></div>
    <p><a name="resume-1"></a><span class="bold_code">resume(Name) -&gt; Void</span><br><a name="resume-2"></a><span class="bold_code">resume(Name, Timeout) -&gt; Void</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Name = <span class="bold_code"><a href="#type-name">name()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Timeout = timeout()</span></div>
<div class="REFTYPES"><span class="bold_code">Void = term()</span></div>
</div></p>
<div class="REFBODY"><p>
        <p>Resumes a suspended process.</p>
      </p></div>
    <p><a name="change_code-4"></a><span class="bold_code">change_code(Name, Module, OldVsn, Extra) -&gt; ok | {error, Reason}</span><br><a name="change_code-5"></a><span class="bold_code">change_code(Name, Module, OldVsn, Extra, Timeout) -&gt;<br>               ok | {error, Reason}</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Name = <span class="bold_code"><a href="#type-name">name()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Module = module()</span></div>
<div class="REFTYPES"><span class="bold_code">OldVsn = undefined | term()</span></div>
<div class="REFTYPES"><span class="bold_code">Extra = term()</span></div>
<div class="REFTYPES"><span class="bold_code">Timeout = timeout()</span></div>
<div class="REFTYPES"><span class="bold_code">Reason = term()</span></div>
</div></p>
<div class="REFBODY"><p>
        <p>Tells the process to change code. The process must be
          suspended to handle this message. The <span class="code">Extra</span> argument is
          reserved for each process to use as its own. The function
          <span class="code">Module:system_code_change/4</span> is called. <span class="code">OldVsn</span> is
          the old version of the <span class="code">Module</span>.</p>
      </p></div>
    <p><a name="get_status-1"></a><span class="bold_code">get_status(Name) -&gt; Status</span><br><a name="get_status-2"></a><span class="bold_code">get_status(Name, Timeout) -&gt; Status</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Name = <span class="bold_code"><a href="#type-name">name()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Timeout = timeout()</span></div>
<div class="REFTYPES"><span class="bold_code">Status = <br>    {status, Pid :: pid(), {module, Module :: module()}, [SItem]}</span></div>
<div class="REFTYPES"><span class="bold_code">SItem = (PDict :: [{Key :: term(), Value :: term()}])<br>      | (SysState :: running | suspended)<br>      | (Parent :: pid())<br>      | (Dbg :: <span class="bold_code"><a href="#type-dbg_opt">dbg_opt()</a></span>)<br>      | (Misc :: term())</span></div>
</div></p>
<div class="REFBODY"><p>
        <p>Gets the status of the process.</p>
        <p>The value of <span class="code">Misc</span> varies for different types of
          processes. For example, a <span class="code">gen_server</span> process returns
          the callback module's state, and a <span class="code">gen_fsm</span> process
          returns information such as its current state name. Callback
          modules for <span class="code">gen_server</span> and <span class="code">gen_fsm</span> can also
          customise the value of <span class="code">Misc</span> by exporting
          a <span class="code">format_status/2</span> function that contributes
          module-specific information;
          see <span class="bold_code"><a href="gen_server.html#Module:format_status-2">gen_server:format_status/2</a></span>
          and <span class="bold_code"><a href="gen_fsm.html#Module:format_status-2">gen_fsm:format_status/2</a></span>
          for more details.</p>
      </p></div>
    <p><a name="install-2"></a><span class="bold_code">install(Name, FuncSpec) -&gt; Void</span><br><a name="install-3"></a><span class="bold_code">install(Name, FuncSpec, Timeout) -&gt; Void</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Name = <span class="bold_code"><a href="#type-name">name()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">FuncSpec = {Func, FuncState}</span></div>
<div class="REFTYPES"><span class="bold_code">Func = <span class="bold_code"><a href="#type-dbg_fun">dbg_fun()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">FuncState = term()</span></div>
<div class="REFTYPES"><span class="bold_code">Timeout = timeout()</span></div>
<div class="REFTYPES"><span class="bold_code">Void = term()</span></div>
</div></p>
<div class="REFBODY"><p>
        <p>This function makes it possible to install other debug
          functions than the ones defined above. An example of such a
          function is a trigger, a function that waits for some
          special event and performs some action when the event is
          generated. This could, for example, be turning on low level tracing.
          </p>
        <p><span class="code">Func</span> is called whenever a system event is
          generated. This function should return <span class="code">done</span>, or a new
          func state. In the first case, the function is removed. It is removed 
          if the function fails.</p>
      </p></div>
    <p><a name="remove-2"></a><span class="bold_code">remove(Name, Func) -&gt; Void</span><br><a name="remove-3"></a><span class="bold_code">remove(Name, Func, Timeout) -&gt; Void</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Name = <span class="bold_code"><a href="#type-name">name()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Func = <span class="bold_code"><a href="#type-dbg_fun">dbg_fun()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Timeout = timeout()</span></div>
<div class="REFTYPES"><span class="bold_code">Void = term()</span></div>
</div></p>
<div class="REFBODY"><p>
        <p>Removes a previously installed debug function from the
          process. <span class="code">Func</span> must be the same as previously
          installed.</p>
      </p></div>
  

  <h3><a name="id225764">Process Implementation Functions</a></h3>
<div class="REFBODY">
    
    <p>The following functions are used when implementing a
      special process. This is an ordinary process which does not use a
      standard behaviour, but a process which understands the standard system messages.</p>
  </div>
  <h3>EXPORTS</h3>
    <p><a name="debug_options-1"></a><span class="bold_code">debug_options(Options) -&gt; [<span class="bold_code"><a href="#type-dbg_opt">dbg_opt()</a></span>]</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Options = [Opt]</span></div>
<div class="REFTYPES"><span class="bold_code">Opt = trace<br>    | log<br>    | statistics<br>    | {log_to_file, FileName}<br>    | {install, FuncSpec}</span></div>
<div class="REFTYPES"><span class="bold_code">FileName = <span class="bold_code"><a href="javascript:erlhref('../../../../doc/../','kernel','file.html#type-name');">file:name()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">FuncSpec = {Func, FuncState}</span></div>
<div class="REFTYPES"><span class="bold_code">Func = <span class="bold_code"><a href="#type-dbg_fun">dbg_fun()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">FuncState = term()</span></div>
</div></p>
<div class="REFBODY"><p>
        <p>This function can be used by a process that initiates a debug
          structure from a list of options. The values of the
          <span class="code">Opt</span> argument are the same as the corresponding
          functions.</p>
      </p></div>
    <p><a name="get_debug-3"></a><span class="bold_code">get_debug(Item, Debug, Default) -&gt; term()</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Item = log | statistics</span></div>
<div class="REFTYPES"><span class="bold_code">Debug = [<span class="bold_code"><a href="#type-dbg_opt">dbg_opt()</a></span>]</span></div>
<div class="REFTYPES"><span class="bold_code">Default = term()</span></div>
</div></p>
<div class="REFBODY"><p>
        <p>This function gets the data associated with a debug option. <span class="code">Default</span> is returned if the
          <span class="code">Item</span> is not found.  Can be
          used by the process to retrieve debug data for printing
          before it terminates.</p>
      </p></div>
    <p><a name="handle_debug-4"></a><span class="bold_code">handle_debug(Debug, FormFunc, Extra, Event) -&gt; [<span class="bold_code"><a href="#type-dbg_opt">dbg_opt()</a></span>]</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Debug = [<span class="bold_code"><a href="#type-dbg_opt">dbg_opt()</a></span>]</span></div>
<div class="REFTYPES"><span class="bold_code">FormFunc = <span class="bold_code"><a href="#type-dbg_fun">dbg_fun()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Extra = term()</span></div>
<div class="REFTYPES"><span class="bold_code">Event = <span class="bold_code"><a href="#type-system_event">system_event()</a></span></span></div>
</div></p>
<div class="REFBODY"><p>
        <p>This function is called by a process when it generates a
           system event. <span class="code">FormFunc</span> is a formatting
           function which is called as <span class="code">FormFunc(Device,
           Event, Extra)</span> in order to print
           the events, which is necessary if tracing is activated.
           <span class="code">Extra</span> is any extra information which the
           process needs in the format function, for example the name
           of the process.</p>
      </p></div>
    <p><a name="handle_system_msg-6"></a><span class="bold_code">handle_system_msg(Msg, From, Parent, Module, Debug, Misc) -&gt; Void</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Msg = term()</span></div>
<div class="REFTYPES"><span class="bold_code">From = {pid(), Tag :: term()}</span></div>
<div class="REFTYPES"><span class="bold_code">Parent = pid()</span></div>
<div class="REFTYPES"><span class="bold_code">Module = module()</span></div>
<div class="REFTYPES"><span class="bold_code">Debug = [<span class="bold_code"><a href="#type-dbg_opt">dbg_opt()</a></span>]</span></div>
<div class="REFTYPES"><span class="bold_code">Misc = Void = term()</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
</div></p>
<div class="REFBODY"><p>
        <p>This function is used by a process module that wishes to take care of system
          messages. The process receives a <span class="code">{system, From, Msg}</span>
          message and passes the <span class="code">Msg</span> and <span class="code">From</span> to this
          function.
          </p>
        <p>This function <strong>never</strong> returns. It calls the function
          <span class="code">Module:system_continue(Parent, NDebug, Misc)</span> where the
          process continues the execution, or
          <span class="code">Module:system_terminate(Reason, Parent, Debug, Misc)</span> if
          the process should terminate. The <span class="code">Module</span> must export
          <span class="code">system_continue/3</span>, <span class="code">system_terminate/4</span>, and
          <span class="code">system_code_change/4</span> (see below).
          </p>
        <p>The <span class="code">Misc</span> argument can be used to save internal data
          in a process, for example its state. It is sent to
          <span class="code">Module:system_continue/3</span> or
          <span class="code">Module:system_terminate/4</span></p>
      </p></div>
    <p><a name="print_log-1"></a><span class="bold_code">print_log(Debug) -&gt; Void</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Debug = [<span class="bold_code"><a href="#type-dbg_opt">dbg_opt()</a></span>]</span></div>
<div class="REFTYPES"><span class="bold_code">Void = term()</span></div>
</div></p>
<div class="REFBODY"><p>
        <p>Prints the logged system events in the debug structure
          using <span class="code">FormFunc</span> as defined when the event was
          generated by a call to <span class="code">handle_debug/4</span>.</p>
      </p></div>
    <p><a name="Mod:system_continue-3"><span class="bold_code">Mod:system_continue(Parent, Debug, Misc) -&gt; none()</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
        <div class="REFTYPES">
<span class="bold_code">Parent = pid()</span><br>
</div>
        <div class="REFTYPES">
<span class="bold_code">Debug = [<span class="bold_code"><a href="#type-dbg_opt">dbg_opt()</a></span>]</span><br>
</div>
        <div class="REFTYPES">
<span class="bold_code">Misc = term()</span><br>
</div>
      </div>
<div class="REFBODY"><p>
        <p>This function is called from <span class="code">sys:handle_system_msg/6</span> when the process
          should continue its execution (for example after it has been
          suspended). This function never returns.</p>
      </p></div>
    <p><a name="Mod:system_terminate-4"><span class="bold_code">Mod:system_terminate(Reason, Parent, Debug, Misc) -&gt; none()</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
        <div class="REFTYPES">
<span class="bold_code">Reason = term()</span><br>
</div>
        <div class="REFTYPES">
<span class="bold_code">Parent = pid()</span><br>
</div>
        <div class="REFTYPES">
<span class="bold_code">Debug = [<span class="bold_code"><a href="#type-dbg_opt">dbg_opt()</a></span>]</span><br>
</div>
        <div class="REFTYPES">
<span class="bold_code">Misc = term()</span><br>
</div>
      </div>
<div class="REFBODY"><p>
        <p>This function is called from <span class="code">sys:handle_system_msg/6</span> when the process
          should terminate. For example, this function is called when
          the process is suspended and its parent orders shut-down.
          It  gives the process a chance to do a clean-up. This function never
          returns.</p>
      </p></div>
    <p><a name="Mod:system_code_change-4"><span class="bold_code">Mod:system_code_change(Misc, Module, OldVsn, Extra) -&gt; {ok, NMisc}</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
        <div class="REFTYPES">
<span class="bold_code">Misc = term()</span><br>
</div>
        <div class="REFTYPES">
<span class="bold_code">OldVsn = undefined | term()</span><br>
</div>
        <div class="REFTYPES">
<span class="bold_code">Module = atom()</span><br>
</div>
        <div class="REFTYPES">
<span class="bold_code">Extra = term()</span><br>
</div>
        <div class="REFTYPES">
<span class="bold_code">NMisc = term()</span><br>
</div>
      </div>
<div class="REFBODY"><p>
        <p>Called from <span class="code">sys:handle_system_msg/6</span> when the process
          should perform a code change. The code change is used when the
          internal data structure has changed. This function
          converts the <span class="code">Misc</span> argument to the new data
          structure. <span class="code">OldVsn</span> is the <strong>vsn</strong> attribute of the
          old version of the <span class="code">Module</span>. If no such attribute was
          defined, the atom <span class="code">undefined</span> is sent.</p>
      </p></div>
  
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