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<h2>
<a name="1205062"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">device_unregister_desc</font>
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<p>
<a name="1205063"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">Unregister a device</font>
</p>
<h3>
<a name="1205064"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">Synopsis</font>
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<a name="1205065"> </a><font size=2 face=Courier><strong>#include <dev.h><br></strong></font>
<a name="1205066"> </a><font size=2 face=Courier><strong>int device_unregister( dev_desc_t* <font size=2 face=Courier><strong><em>desc </em></strong></font>);<br></strong></font>
<h3>
<a name="1205067"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">Arguments</font>
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<a name="1207876"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif"><b><font size=2 face=Courier><strong>dev_desc_t* </strong></font><font size=2 face=Courier><strong><em>desc</em></strong></font></b></font>
<br>
<dl><dl> <dl>
<dt> <a name="1207878"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">A pointer to a device descriptor</font>
</dl>
</dl></dl>
<h3>
<a name="1205070"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">Results</font>
</h3>
<p>
<a name="1205071"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">Returns <font size=2 face=Courier><strong>0</strong></font> on success, or <font size=2 face=Courier><strong>-1</strong></font> if an error occurs.</font>
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<h3>
<a name="1205072"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">Errors</font>
</h3>
<p>
<a name="1205073"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">Returns <font size=2 face=Courier><strong>-1</strong></font> if <font size=2 face=Courier><strong>ops</strong></font> is <font size=2 face=Courier><strong>NULL</strong></font> or <font size=2 face=Courier><strong>desc</strong></font> is not a registered device lookup table.</font>
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<h3>
<a name="1205074"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">Description</font>
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<p>
<a name="1205075"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif"><font size=2 face=Courier><strong>device_unregister_desc()</strong></font> attempts to unregister a device previously registered using <font size=2 face=Courier><strong>device_register()</strong></font> or <font size=2 face=Courier><strong>device_register_init()</strong></font>. This involves searching the device list for the appropriate device.</font>
</p>
<p>
<a name="1205076"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif"><font size=2 face=Courier><strong>device_unregister_desc()</strong></font> checks the file descriptor table for files which are currently open and associated with the device being unregistered. Any such files are marked as having no associated device, thus causing further I/O operations on those files to fail.</font>
</p>
<h3>
<a name="1205077"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">Example</font>
</h3>
<a name="1205078"> </a><font size=2 face=Courier><strong>extern dev_op_t asc_ops;<br>dev_desc_t* desc = device_register("asc", 0, &asc_ops);<br><font size=2 face=Courier><em>...</em></font> <br>device_unregister_desc(desc);<br></strong></font>
<h3>
<a name="1205082"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">See also</font>
</h3>
<p>
<a name="1205083"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif"><a href="posix27.htm#1204947"><font color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>device_register</i></font></a>, <a href="posix28.htm#1204981"><font color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>device_register_init</i></font></a>, <a href="posix30.htm#1205039"><font color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>device_unregister</i></font></a></font>
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