1*0f4c859eSApple OSS Distributions<h2>memory_object_data_unavailable</h2> 2*0f4c859eSApple OSS Distributions<hr> 3*0f4c859eSApple OSS Distributions<p> 4*0f4c859eSApple OSS Distributions<strong>Function</strong> - Instruct kernel to zero-fill pages as requested data does not exist. 5*0f4c859eSApple OSS Distributions<h3>SYNOPSIS</h3> 6*0f4c859eSApple OSS Distributions<pre> 7*0f4c859eSApple OSS Distributions<strong>kern_return_t memory_object_data_unavailable</strong> 8*0f4c859eSApple OSS Distributions <strong>(memory_object_control_t</strong> <var>memory_control</var>, 9*0f4c859eSApple OSS Distributions <strong>vm_offset_t</strong> <var>offset</var>, 10*0f4c859eSApple OSS Distributions <strong>vm_size_t</strong> <var>size</var><strong>);</strong> 11*0f4c859eSApple OSS Distributions</pre> 12*0f4c859eSApple OSS Distributions<h3>PARAMETERS</h3> 13*0f4c859eSApple OSS Distributions<dl> 14*0f4c859eSApple OSS Distributions<p> 15*0f4c859eSApple OSS Distributions<dt> <var>memory_control</var> 16*0f4c859eSApple OSS Distributions<dd> 17*0f4c859eSApple OSS Distributions[in memory-cache-control send right] 18*0f4c859eSApple OSS DistributionsThe memory cache control port 19*0f4c859eSApple OSS Distributionsto be used by the memory manager for cache management requests. 20*0f4c859eSApple OSS DistributionsThis port is provided by the kernel in a <strong>memory_object_init</strong> or a 21*0f4c859eSApple OSS Distributions<strong>memory_object_create</strong> call. 22*0f4c859eSApple OSS Distributions<p> 23*0f4c859eSApple OSS Distributions<dt> <var>offset</var> 24*0f4c859eSApple OSS Distributions<dd> 25*0f4c859eSApple OSS Distributions[in scalar] 26*0f4c859eSApple OSS DistributionsThe offset within the memory object, in bytes. 27*0f4c859eSApple OSS Distributions<p> 28*0f4c859eSApple OSS Distributions<dt> <var>size</var> 29*0f4c859eSApple OSS Distributions<dd> 30*0f4c859eSApple OSS Distributions[in scalar] 31*0f4c859eSApple OSS DistributionsThe number of bytes of data (starting at <var>offset</var>). The number 32*0f4c859eSApple OSS Distributionsmust convert to an integral number of memory object pages. 33*0f4c859eSApple OSS Distributions</dl> 34*0f4c859eSApple OSS Distributions<h3>DESCRIPTION</h3> 35*0f4c859eSApple OSS Distributions<p> 36*0f4c859eSApple OSS DistributionsThe <strong>memory_object_data_unavailable</strong> function indicates 37*0f4c859eSApple OSS Distributionsthat the memory 38*0f4c859eSApple OSS Distributionsmanager cannot provide the kernel with the data requested for 39*0f4c859eSApple OSS Distributionsthe given region. 40*0f4c859eSApple OSS DistributionsInstead, the kernel should provide the data for this region. 41*0f4c859eSApple OSS Distributions<p> 42*0f4c859eSApple OSS DistributionsA memory manager can use this call in any of the following situations: 43*0f4c859eSApple OSS Distributions<ul> 44*0f4c859eSApple OSS Distributions<li> 45*0f4c859eSApple OSS DistributionsWhen the object was created by the kernel 46*0f4c859eSApple OSS Distributions(via <strong>memory_object_create</strong>) and 47*0f4c859eSApple OSS Distributionsthe kernel has not yet provided data for the region (via either 48*0f4c859eSApple OSS Distributions<strong>memory_object_data_initialize</strong> or <strong>memory_object_data_return</strong>). 49*0f4c859eSApple OSS DistributionsIn this case, the 50*0f4c859eSApple OSS Distributionsobject is a temporary memory object; the memory manager is the default 51*0f4c859eSApple OSS Distributionsmemory manager; and the kernel should provide zero-filled pages for the 52*0f4c859eSApple OSS Distributionsobject. 53*0f4c859eSApple OSS Distributions <p> 54*0f4c859eSApple OSS Distributions<li> 55*0f4c859eSApple OSS DistributionsWhen the object is a normal user-created memory object. In this case, the 56*0f4c859eSApple OSS Distributionskernel should provide zero-filled pages for the region. 57*0f4c859eSApple OSS Distributions</ul> 58*0f4c859eSApple OSS Distributions<h3>RETURN VALUES</h3> 59*0f4c859eSApple OSS Distributions<p> 60*0f4c859eSApple OSS DistributionsOnly generic errors apply. 61*0f4c859eSApple OSS Distributions<h3>RELATED INFORMATION</h3> 62*0f4c859eSApple OSS Distributions<p> 63*0f4c859eSApple OSS DistributionsFunctions: 64*0f4c859eSApple OSS Distributions<a href="memory_object_create.html"><strong>memory_object_create</strong></a>, 65*0f4c859eSApple OSS Distributions<a href="memory_object_data_error.html"><strong>memory_object_data_error</strong></a>, 66*0f4c859eSApple OSS Distributions<a href="memory_object_data_request.html"><strong>memory_object_data_request</strong></a>, 67*0f4c859eSApple OSS Distributions<a href="memory_object_data_supply.html"><strong>memory_object_data_supply</strong></a>. 68