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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>.