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Next: <a href="Trace-File-Format.html#Trace-File-Format" accesskey="n" rel="next">Trace File Format</a>, Previous: <a href="Target-Descriptions.html#Target-Descriptions" accesskey="p" rel="prev">Target Descriptions</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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<a name="Operating-System-Information-1"></a>
<h2 class="appendix">Appendix H Operating System Information</h2>
<a name="index-operating-system-information"></a>

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<tr><td align="left" valign="top">&bull; <a href="Process-list.html#Process-list" accesskey="1">Process list</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
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<p>Users of <small>GDB</small> often wish to obtain information about the state of
the operating system running on the target&mdash;for example the list of
processes, or the list of open files.  This section describes the
mechanism that makes it possible.  This mechanism is similar to the 
target features mechanism (see <a href="Target-Descriptions.html#Target-Descriptions">Target Descriptions</a>), but focuses
on a different aspect of target.
</p>
<p>Operating system information is retrieved from the target via the
remote protocol, using &lsquo;<samp>qXfer</samp>&rsquo; requests (see <a href="General-Query-Packets.html#qXfer-osdata-read">qXfer osdata read</a>).  The object name in the request should be &lsquo;<samp>osdata</samp>&rsquo;, and
the <var>annex</var> identifies the data to be fetched.
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