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-<h2>memory_object_data_request</h2>
-<hr>
-<p>
-<strong>Server Interface</strong> - Request that memory manager page-in specified data.
-<h3>SYNOPSIS</h3>
-<pre>
-<strong>kern_return_t memory_object_data_request</strong>
- <strong>(memory_object_t</strong> <var>memory_object</var>,
- <strong>memory_object_control_t</strong> <var>memory_control</var>,
- <strong>vm_offset_t</strong> <var>offset</var>,
- <strong>vm_size_t</strong> <var>length</var>,
- <strong>vm_prot_t</strong> <var>desired_access</var><strong>);</strong>
-
-
-<strong>kern_return_t seqnos_memory_object_data_request</strong>
- <strong>(memory_object_t</strong> <var>memory_object</var>,
- <strong>mach_port_seqno_t</strong> <var>seqno</var>,
- <strong>memory_object_control_t</strong> <var>memory_control</var>,
- <strong>vm_offset_t</strong> <var>offset</var>,
- <strong>vm_size_t</strong> <var>length</var>,
- <strong>vm_prot_t</strong> <var>desired_access</var><strong>);</strong>
-</pre>
-<h3>PARAMETERS</h3>
-<dl>
-<p>
-<dt> <var>memory_object</var>
-<dd>
-[in abstract-memory-object (receive) right]
-The abstract memory
-object port that represents the memory object data.
-<p>
-<dt> <var>seqno</var>
-<dd>
-[in scalar]
-The sequence number of this message relative to the abstract
-memory object port.
-<p>
-<dt> <var>memory_control</var>
-<dd>
-[in memory-cache-control send right]
-The memory cache control port
-to be used for a response by the memory manager. If the memory
-object has been supplied to more than one kernel, this parameter
-identifies the kernel that is making the call.
-<p>
-<dt> <var>offset</var>
-<dd>
-[in scalar]
-The offset within the memory object.
-<p>
-<dt> <var>length</var>
-<dd>
-[in scalar]
-The number of bytes requested, starting at <var>offset</var>. The
-number converts to an integral number of virtual pages.
-<p>
-<dt> <var>desired_access</var>
-<dd>
-[in scalar]
-The memory access modes to be allowed for the cached
-data. Possible values are obtained by or'ing together the following
-values:
-<dl>
-<p>
-<dt> <strong>VM_PROT_READ</strong>
-<dd>
-Allows read access.
-<p>
-<dt> <strong>VM_PROT_WRITE</strong>
-<dd>
-Allows write access.
-<p>
-<dt> <strong>VM_PROT_EXECUTE</strong>
-<dd>
-Allows execute access.
-</dl>
-</dl>
-<h3>DESCRIPTION</h3>
-<p>
-A <strong>memory_object_data_request</strong> function is called as
-the result of a kernel
-message requesting data from the specified memory object, for at least the
-access specified.
-<p>
-The kernel issues this call after a cache miss (that is, a page
-fault for which the
-kernel does not have the data). The kernel requests only amounts
-of data that are
-multiples of the page size included in the
-<strong>memory_object_init</strong> or <strong>memory_object_create</strong> call.
-<p>
-The memory manager is expected to use <strong>memory_object_data_supply</strong> to
-return at least the specified data, with as much access as it
-can allow. If the
-memory manager cannot provide the data (for example, because
-of a hardware error),
-it can use the <strong>memory_object_data_error</strong> call. The
-memory manager can also
-use <strong>memory_object_data_unavailable</strong> to tell the kernel
-to supply zero-filled
-memory for the region.
-<h3>RETURN VALUES</h3>
-<p>
-Only generic errors apply.
-<h3>RELATED INFORMATION</h3>
-<p>
-Functions:
-<a href="memory_object_data_error.html"><strong>memory_object_data_error</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>,
-<a href="memory_object_server.html"><strong>memory_object_server</strong></a>,
-<a href="SMO_server.html"><strong>seqnos_memory_object_server</strong></a>.
-