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<img alt="Erlang logo" src="../../../../doc/erlang-logo.png"><br><small><a href="index.html">Reference Manual</a><br><a href="release_notes.html">Release Notes</a><br><a href="../pdf/os_mon-2.2.10.pdf">PDF</a><br><a href="../../../../doc/index.html">Top</a></small><p><strong>OS_Mon</strong><br><strong>Reference Manual</strong><br><small>Version 2.2.10</small></p>
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<!-- refpage --><center><h1>nteventlog</h1></center>
<h3>MODULE</h3>
<div class="REFBODY">nteventlog</div>
<h3>MODULE SUMMARY</h3>
<div class="REFBODY">Interface to Windows Event Log</div>
<h3>DESCRIPTION</h3>
<div class="REFBODY"><p>
<p><span class="code">nteventlog</span> provides a generic interface to the Windows
event log. It is part of the OS_Mon application, see
<span class="bold_code"><a href="os_mon_app.html">os_mon(6)</a></span>. Available for
Windows versions where the event log is available. That is, not
for Windows 98 and some other older Windows versions, but for most
(all?) newer Windows versions.</p>
<p>This module is used as the Windows backend for <span class="code">os_sup</span>, see
<span class="bold_code"><a href="os_sup.html">os_sup(3)</a></span>.</p>
<p>To retain backwards compatibility, this module can also be used
to start a standalone <span class="code">nteventlog</span> process which is not part
of the OS_Mon supervision tree. When starting such a process,
the user has to supply an identifier as well as a callback
function to handle the messages.</p>
<p>The identifier, an arbitrary string, should be reused whenever
the same application (or node) wants to start the process.
<span class="code">nteventlog</span> is informed about all events that have arrived
to the eventlog since the last accepted message for the current
identifier. As long as the same identifier is used, the same
eventlog record will not be sent to <span class="code">nteventlog</span> more than
once (with the exception of when graved system failures arise, in
which case the last records written before the failure may be
sent to Erlang again after reboot).</p>
<p>If the event log is configured to wrap around automatically,
records that have arrived to the log and been overwritten when
<span class="code">nteventlog</span> was not running are lost. It however detects
this state and loses no records that are not overwritten.</p>
<p>The callback function works as described in <span class="code">os_sup(3)</span>.</p>
</p></div>
<h3>EXPORTS</h3>
<p><a name="start-2"><span class="bold_code">start(Identifier, MFA) -> Result</span></a><br><a name="start_link-2"><span class="bold_code">start_link(Identifier, MFA) -> Result</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">Identifier = string() | atom()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">MFA = {Mod, Func, Args}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Mod = Func = atom()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Args = [term()]</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Result = {ok, Pid} | {error, {already_started, Pid}}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Pid = pid()</span><br>
</div>
</div>
<div class="REFBODY"><p>
<p>This function starts the standalone <span class="code">nteventlog</span> process
and, if <span class="code">start_link/2</span> is used, links to it.</p>
<p><span class="code">Identifier</span> is an identifier as described above.</p>
<p><span class="code">MFA</span> is the supplied callback function. When
<span class="code">nteventlog</span> receives information about a new event, this
function will be called as <span class="code">apply(Mod, Func, [Event|Args])</span> where <span class="code">Event</span> is a tuple</p>
</p></div>
<p><a name="stop-0"><span class="bold_code">stop() -> stopped</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">Result = stopped</span><br>
</div>
</div>
<div class="REFBODY"><p>
<p>Stops <span class="code">nteventlog</span>. Usually only used during
development. The server does not have to be shut down
gracefully to maintain its state.</p>
</p></div>
<h3><a name="id66405">See Also</a></h3>
<div class="REFBODY">
<p><span class="bold_code"><a href="os_mon_app.html">os_mon(6)</a></span>,
<span class="bold_code"><a href="os_sup.html">os_sup(3)</a></span></p>
<p>Windows NT documentation</p>
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