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<concept id="GUID-44F4089F-7184-5F73-A01E-E0F639D32EA1" xml:lang="en"><title>System

Wide Error Codes Overview</title><shortdesc>This is an overview document of error codes used system APIs. </shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>

<section id="GUID-6B6D8FFA-DF27-44D5-AEBF-5CCC81D4C39F"><title>Purpose</title> <p>Provides a core set of error codes that

may be returned by System APIs. They are defined in e32err.h. </p> </section>

<section id="GUID-B103B96A-B168-4F3C-821B-AF56D0E35643"><title>Description</title> <p>These error codes are used by System

APIs to indicate common mathematical, file, communications, and client/server

errors. These error codes are intended to be generic to reflect the fact that

many error conditions occur for similar reasons in nearly all software components.

The errors may also be returned by non-System APIs where appropriate. APIs

may also use additional error codes where the core set is not sufficient. </p> <p>Error

codes are returned to clients in three circumstances: </p> <ul>

<li id="GUID-ED9D2507-15E4-528B-AF04-3D0CC21F758D"><p>as a simple <xref href="GUID-7A2A43EC-6125-3BFE-834B-23C37F7B40D5.dita"><apiname>TInt</apiname></xref> return

value from a synchronous function </p> </li>

<li id="GUID-50CC41C2-6EA7-5DCB-A4B8-5092A15A1C53"><p>as a leave code from

a leaving function, which can be caught in a trap harness </p> </li>

<li id="GUID-2D401685-8851-574B-A672-47DFAF9F3C52"><p>in a request status,

when an asynchronous request function completes </p> </li>

</ul> <p>The complete list can be found at e32err.h. This not only describes

the symbols used in C++ code, but also the numerical values that those symbols

represent. </p> <p>In the code itself, the core list is defined in the header

file <filepath>e32err.h</filepath>. </p> </section>

<section id="GUID-9B23BFC3-25DB-4578-ABB1-AF4E38431967"><title>See also</title> <p><xref href="GUID-1294F540-FDA7-5050-BAFB-3C9888491B98.dita">Asynchronous

Services Overview</xref>  </p> <p><xref href="GUID-E5A83EF3-948B-5729-A2CD-3644E803520B.dita">Cleanup

Support Overview</xref>  </p> </section>