1*1031c584SApple OSS Distributions<h2>memory_object_data_unavailable</h2> 2*1031c584SApple OSS Distributions<hr> 3*1031c584SApple OSS Distributions<p> 4*1031c584SApple OSS Distributions<strong>Function</strong> - Instruct kernel to zero-fill pages as requested data does not exist. 5*1031c584SApple OSS Distributions<h3>SYNOPSIS</h3> 6*1031c584SApple OSS Distributions<pre> 7*1031c584SApple OSS Distributions<strong>kern_return_t memory_object_data_unavailable</strong> 8*1031c584SApple OSS Distributions <strong>(memory_object_control_t</strong> <var>memory_control</var>, 9*1031c584SApple OSS Distributions <strong>vm_offset_t</strong> <var>offset</var>, 10*1031c584SApple OSS Distributions <strong>vm_size_t</strong> <var>size</var><strong>);</strong> 11*1031c584SApple OSS Distributions</pre> 12*1031c584SApple OSS Distributions<h3>PARAMETERS</h3> 13*1031c584SApple OSS Distributions<dl> 14*1031c584SApple OSS Distributions<p> 15*1031c584SApple OSS Distributions<dt> <var>memory_control</var> 16*1031c584SApple OSS Distributions<dd> 17*1031c584SApple OSS Distributions[in memory-cache-control send right] 18*1031c584SApple OSS DistributionsThe memory cache control port 19*1031c584SApple OSS Distributionsto be used by the memory manager for cache management requests. 20*1031c584SApple OSS DistributionsThis port is provided by the kernel in a <strong>memory_object_init</strong> or a 21*1031c584SApple OSS Distributions<strong>memory_object_create</strong> call. 22*1031c584SApple OSS Distributions<p> 23*1031c584SApple OSS Distributions<dt> <var>offset</var> 24*1031c584SApple OSS Distributions<dd> 25*1031c584SApple OSS Distributions[in scalar] 26*1031c584SApple OSS DistributionsThe offset within the memory object, in bytes. 27*1031c584SApple OSS Distributions<p> 28*1031c584SApple OSS Distributions<dt> <var>size</var> 29*1031c584SApple OSS Distributions<dd> 30*1031c584SApple OSS Distributions[in scalar] 31*1031c584SApple OSS DistributionsThe number of bytes of data (starting at <var>offset</var>). The number 32*1031c584SApple OSS Distributionsmust convert to an integral number of memory object pages. 33*1031c584SApple OSS Distributions</dl> 34*1031c584SApple OSS Distributions<h3>DESCRIPTION</h3> 35*1031c584SApple OSS Distributions<p> 36*1031c584SApple OSS DistributionsThe <strong>memory_object_data_unavailable</strong> function indicates 37*1031c584SApple OSS Distributionsthat the memory 38*1031c584SApple OSS Distributionsmanager cannot provide the kernel with the data requested for 39*1031c584SApple OSS Distributionsthe given region. 40*1031c584SApple OSS DistributionsInstead, the kernel should provide the data for this region. 41*1031c584SApple OSS Distributions<p> 42*1031c584SApple OSS DistributionsA memory manager can use this call in any of the following situations: 43*1031c584SApple OSS Distributions<ul> 44*1031c584SApple OSS Distributions<li> 45*1031c584SApple OSS DistributionsWhen the object was created by the kernel 46*1031c584SApple OSS Distributions(via <strong>memory_object_create</strong>) and 47*1031c584SApple OSS Distributionsthe kernel has not yet provided data for the region (via either 48*1031c584SApple OSS Distributions<strong>memory_object_data_initialize</strong> or <strong>memory_object_data_return</strong>). 49*1031c584SApple OSS DistributionsIn this case, the 50*1031c584SApple OSS Distributionsobject is a temporary memory object; the memory manager is the default 51*1031c584SApple OSS Distributionsmemory manager; and the kernel should provide zero-filled pages for the 52*1031c584SApple OSS Distributionsobject. 53*1031c584SApple OSS Distributions <p> 54*1031c584SApple OSS Distributions<li> 55*1031c584SApple OSS DistributionsWhen the object is a normal user-created memory object. In this case, the 56*1031c584SApple OSS Distributionskernel should provide zero-filled pages for the region. 57*1031c584SApple OSS Distributions</ul> 58*1031c584SApple OSS Distributions<h3>RETURN VALUES</h3> 59*1031c584SApple OSS Distributions<p> 60*1031c584SApple OSS DistributionsOnly generic errors apply. 61*1031c584SApple OSS Distributions<h3>RELATED INFORMATION</h3> 62*1031c584SApple OSS Distributions<p> 63*1031c584SApple OSS DistributionsFunctions: 64*1031c584SApple OSS Distributions<a href="memory_object_create.html"><strong>memory_object_create</strong></a>, 65*1031c584SApple OSS Distributions<a href="memory_object_data_error.html"><strong>memory_object_data_error</strong></a>, 66*1031c584SApple OSS Distributions<a href="memory_object_data_request.html"><strong>memory_object_data_request</strong></a>, 67*1031c584SApple OSS Distributions<a href="memory_object_data_supply.html"><strong>memory_object_data_supply</strong></a>. 68