1*c54f35caSApple OSS Distributions<h2>memory_object_data_unavailable</h2> 2*c54f35caSApple OSS Distributions<hr> 3*c54f35caSApple OSS Distributions<p> 4*c54f35caSApple OSS Distributions<strong>Function</strong> - Instruct kernel to zero-fill pages as requested data does not exist. 5*c54f35caSApple OSS Distributions<h3>SYNOPSIS</h3> 6*c54f35caSApple OSS Distributions<pre> 7*c54f35caSApple OSS Distributions<strong>kern_return_t memory_object_data_unavailable</strong> 8*c54f35caSApple OSS Distributions <strong>(memory_object_control_t</strong> <var>memory_control</var>, 9*c54f35caSApple OSS Distributions <strong>vm_offset_t</strong> <var>offset</var>, 10*c54f35caSApple OSS Distributions <strong>vm_size_t</strong> <var>size</var><strong>);</strong> 11*c54f35caSApple OSS Distributions</pre> 12*c54f35caSApple OSS Distributions<h3>PARAMETERS</h3> 13*c54f35caSApple OSS Distributions<dl> 14*c54f35caSApple OSS Distributions<p> 15*c54f35caSApple OSS Distributions<dt> <var>memory_control</var> 16*c54f35caSApple OSS Distributions<dd> 17*c54f35caSApple OSS Distributions[in memory-cache-control send right] 18*c54f35caSApple OSS DistributionsThe memory cache control port 19*c54f35caSApple OSS Distributionsto be used by the memory manager for cache management requests. 20*c54f35caSApple OSS DistributionsThis port is provided by the kernel in a <strong>memory_object_init</strong> or a 21*c54f35caSApple OSS Distributions<strong>memory_object_create</strong> call. 22*c54f35caSApple OSS Distributions<p> 23*c54f35caSApple OSS Distributions<dt> <var>offset</var> 24*c54f35caSApple OSS Distributions<dd> 25*c54f35caSApple OSS Distributions[in scalar] 26*c54f35caSApple OSS DistributionsThe offset within the memory object, in bytes. 27*c54f35caSApple OSS Distributions<p> 28*c54f35caSApple OSS Distributions<dt> <var>size</var> 29*c54f35caSApple OSS Distributions<dd> 30*c54f35caSApple OSS Distributions[in scalar] 31*c54f35caSApple OSS DistributionsThe number of bytes of data (starting at <var>offset</var>). The number 32*c54f35caSApple OSS Distributionsmust convert to an integral number of memory object pages. 33*c54f35caSApple OSS Distributions</dl> 34*c54f35caSApple OSS Distributions<h3>DESCRIPTION</h3> 35*c54f35caSApple OSS Distributions<p> 36*c54f35caSApple OSS DistributionsThe <strong>memory_object_data_unavailable</strong> function indicates 37*c54f35caSApple OSS Distributionsthat the memory 38*c54f35caSApple OSS Distributionsmanager cannot provide the kernel with the data requested for 39*c54f35caSApple OSS Distributionsthe given region. 40*c54f35caSApple OSS DistributionsInstead, the kernel should provide the data for this region. 41*c54f35caSApple OSS Distributions<p> 42*c54f35caSApple OSS DistributionsA memory manager can use this call in any of the following situations: 43*c54f35caSApple OSS Distributions<ul> 44*c54f35caSApple OSS Distributions<li> 45*c54f35caSApple OSS DistributionsWhen the object was created by the kernel 46*c54f35caSApple OSS Distributions(via <strong>memory_object_create</strong>) and 47*c54f35caSApple OSS Distributionsthe kernel has not yet provided data for the region (via either 48*c54f35caSApple OSS Distributions<strong>memory_object_data_initialize</strong> or <strong>memory_object_data_return</strong>). 49*c54f35caSApple OSS DistributionsIn this case, the 50*c54f35caSApple OSS Distributionsobject is a temporary memory object; the memory manager is the default 51*c54f35caSApple OSS Distributionsmemory manager; and the kernel should provide zero-filled pages for the 52*c54f35caSApple OSS Distributionsobject. 53*c54f35caSApple OSS Distributions <p> 54*c54f35caSApple OSS Distributions<li> 55*c54f35caSApple OSS DistributionsWhen the object is a normal user-created memory object. In this case, the 56*c54f35caSApple OSS Distributionskernel should provide zero-filled pages for the region. 57*c54f35caSApple OSS Distributions</ul> 58*c54f35caSApple OSS Distributions<h3>RETURN VALUES</h3> 59*c54f35caSApple OSS Distributions<p> 60*c54f35caSApple OSS DistributionsOnly generic errors apply. 61*c54f35caSApple OSS Distributions<h3>RELATED INFORMATION</h3> 62*c54f35caSApple OSS Distributions<p> 63*c54f35caSApple OSS DistributionsFunctions: 64*c54f35caSApple OSS Distributions<a href="memory_object_create.html"><strong>memory_object_create</strong></a>, 65*c54f35caSApple OSS Distributions<a href="memory_object_data_error.html"><strong>memory_object_data_error</strong></a>, 66*c54f35caSApple OSS Distributions<a href="memory_object_data_request.html"><strong>memory_object_data_request</strong></a>, 67*c54f35caSApple OSS Distributions<a href="memory_object_data_supply.html"><strong>memory_object_data_supply</strong></a>. 68