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+<h2>memory_object_data_error</h2>
+<hr>
+<p>
+<strong>Function</strong> - An error prevents the supply of previously requested data.
+<h3>SYNOPSIS</h3>
+<pre>
+<strong>kern_return_t   memory_object_data_error</strong>
+                <strong>(memory_object_control_t</strong>         <var>memory_control</var>,
+                 <strong>vm_offset_t</strong>                             <var>offset</var>,
+                 <strong>vm_size_t</strong>                                 <var>size</var>,
+                 <strong>kern_return_t</strong>                           <var>reason</var><strong>);</strong>
+</pre>
+<h3>PARAMETERS</h3>
+<dl>
+<p>
+<dt> <var>memory_control</var> 
+<dd>
+[in memory-cache-control send right]
+The memory cache control port 
+to be used by the memory manager for cache management requests. 
+This port is provided by the kernel in a <strong>memory_object_create</strong> call.
+<p>
+<dt> <var>offset</var> 
+<dd>
+[in scalar]
+The offset within the memory object, in bytes.
+<p>
+<dt> <var>size</var> 
+<dd>
+[in scalar]
+The number of bytes of data (starting at <var>offset</var>).  The number 
+must convert to an integral number of memory object pages.
+<p>
+<dt> <var>reason</var> 
+<dd>
+[in scalar]
+Reason for the error.
+</dl>
+<h3>DESCRIPTION</h3>
+<p>
+The <strong>memory_object_data_error</strong> function indicates that
+the memory manager 
+cannot provide the kernel with the data requested for the given region,
+specifying a reason for the error.
+<p>
+When the kernel issues a <strong>memory_object_data_request</strong> call, the memory
+manager can respond with a <strong>memory_object_data_error</strong>
+call to indicate that the 
+page cannot be retrieved, and that a memory failure exception should be raised 
+in any client threads that are waiting for the page.  Clients
+are permitted to catch 
+these exceptions and retry their page faults.  As a result, this
+call can be used to 
+report transient errors as well as permanent ones.  A memory manager can use 
+this call for both hardware errors (for example, disk failures) and software
+errors (for example, accessing data that does not exist or is protected).
+<h3>NOTES</h3>
+<p>
+If reason has a system code of <var>err_kern</var>, the kernel will substitute
+an error value 
+of <strong>KERN_MEMORY_ERROR</strong>.
+<h3>RETURN VALUES</h3>
+<p>
+Only generic errors apply.
+<h3>RELATED INFORMATION</h3>
+<p>
+Functions:
+<a href="memory_object_data_request.html"><strong>memory_object_data_request</strong></a>,
+<a href="memory_object_data_supply.html"><strong>memory_object_data_supply</strong></a>,
+<a href="MO_data_unavailable.html"><strong>memory_object_data_unavailable</strong></a>.