1<h2>memory_object_data_unavailable</h2> 2<hr> 3<p> 4<strong>Function</strong> - Instruct kernel to zero-fill pages as requested data does not exist. 5<h3>SYNOPSIS</h3> 6<pre> 7<strong>kern_return_t memory_object_data_unavailable</strong> 8 <strong>(memory_object_control_t</strong> <var>memory_control</var>, 9 <strong>vm_offset_t</strong> <var>offset</var>, 10 <strong>vm_size_t</strong> <var>size</var><strong>);</strong> 11</pre> 12<h3>PARAMETERS</h3> 13<dl> 14<p> 15<dt> <var>memory_control</var> 16<dd> 17[in memory-cache-control send right] 18The memory cache control port 19to be used by the memory manager for cache management requests. 20This port is provided by the kernel in a <strong>memory_object_init</strong> or a 21<strong>memory_object_create</strong> call. 22<p> 23<dt> <var>offset</var> 24<dd> 25[in scalar] 26The offset within the memory object, in bytes. 27<p> 28<dt> <var>size</var> 29<dd> 30[in scalar] 31The number of bytes of data (starting at <var>offset</var>). The number 32must convert to an integral number of memory object pages. 33</dl> 34<h3>DESCRIPTION</h3> 35<p> 36The <strong>memory_object_data_unavailable</strong> function indicates 37that the memory 38manager cannot provide the kernel with the data requested for 39the given region. 40Instead, the kernel should provide the data for this region. 41<p> 42A memory manager can use this call in any of the following situations: 43<ul> 44<li> 45When the object was created by the kernel 46(via <strong>memory_object_create</strong>) and 47the kernel has not yet provided data for the region (via either 48<strong>memory_object_data_initialize</strong> or <strong>memory_object_data_return</strong>). 49In this case, the 50object is a temporary memory object; the memory manager is the default 51memory manager; and the kernel should provide zero-filled pages for the 52object. 53 <p> 54<li> 55When the object is a normal user-created memory object. In this case, the 56kernel should provide zero-filled pages for the region. 57</ul> 58<h3>RETURN VALUES</h3> 59<p> 60Only generic errors apply. 61<h3>RELATED INFORMATION</h3> 62<p> 63Functions: 64<a href="memory_object_create.html"><strong>memory_object_create</strong></a>, 65<a href="memory_object_data_error.html"><strong>memory_object_data_error</strong></a>, 66<a href="memory_object_data_request.html"><strong>memory_object_data_request</strong></a>, 67<a href="memory_object_data_supply.html"><strong>memory_object_data_supply</strong></a>. 68