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<h1 class="topictitle1">Error code parameter</h1>
<div><p>An API error code parameter is a variable-length structure that
is common to all of the system APIs.</p>
<div class="section"><p>The error code parameter controls how errors are returned to the
application. The parameter must be initialized before the program calls the
API. Depending on how the error code structure is set, this parameter either
returns information associated with an error condition or causes errors to
be returned as exception messages.</p>
<p>For some APIs, the error code parameter
is optional. If you do not code the optional error code parameter, the API
returns diagnostic and escape messages. If you code the optional error code
parameter, the API can either signal exceptions or return the exception information
in the error code parameter.</p>
<div class="note"><span class="notetitle">Notes:</span> <ol><li>The ILE CEE APIs use feedback codes and conditions.</li>
<li>The UNIX<sup>®</sup>-type
APIs and the National Language Data Conversion APIs use <em>errno</em> to report
error conditions.</li>
</ol>
</div>
<p>The error code structure is provided in the QSYSINC library
and is called QUSEC.</p>
</div>
</div>
<div>
<ul class="ullinks">
<li class="ulchildlink"><strong><a href="errorcodeformat.htm">Error code parameter format</a></strong><br />
Most iSeries™ APIs
include an error code parameter to return error codes and exception data to
the application. The error code parameter can be one of two variable-length
structures, format ERRC0100 or format ERRC0200.</li>
<li class="ulchildlink"><strong><a href="errorexceptions.htm">Examples: Receiving error conditions</a></strong><br />
These examples illustrate receiving error conditions</li>
<li class="ulchildlink"><strong><a href="errorjoblog.htm">Using the job log to diagnose API errors</a></strong><br />
Sometimes an API may issue one or more messages that state that the API failed, and the messages may direct you to see the previously listed messages in the job log. If your application program needs to determine the cause of the error message, you can use the Receive Message (RCVMSG) command or the Receive Message APIs to receive the messages that explain the reason for the error.</li>
</ul>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="conParameter.htm" title="After you have found the API that you want to use, you need to code a call to an API and pass to the API the required set of parameters appropriate for that API.">API parameters</a></div>
</div>
<div class="relconcepts"><strong>Related concepts</strong><br />
<div><a href="conQSYSINC.htm" title="The QSYSINC (system include) library provides all source includes for APIs shipped with i5/OS.">Include files and the QSYSINC library</a></div>
</div>
<div class="relref"><strong>Related reference</strong><br />
<div><a href="../apis/ile1a6.htm">i5/OS Messages and the ILE CEE API Feedback Code</a></div>
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