1*2c2f96dcSApple OSS Distributions<h2>memory_object_data_unavailable</h2> 2*2c2f96dcSApple OSS Distributions<hr> 3*2c2f96dcSApple OSS Distributions<p> 4*2c2f96dcSApple OSS Distributions<strong>Function</strong> - Instruct kernel to zero-fill pages as requested data does not exist. 5*2c2f96dcSApple OSS Distributions<h3>SYNOPSIS</h3> 6*2c2f96dcSApple OSS Distributions<pre> 7*2c2f96dcSApple OSS Distributions<strong>kern_return_t memory_object_data_unavailable</strong> 8*2c2f96dcSApple OSS Distributions <strong>(memory_object_control_t</strong> <var>memory_control</var>, 9*2c2f96dcSApple OSS Distributions <strong>vm_offset_t</strong> <var>offset</var>, 10*2c2f96dcSApple OSS Distributions <strong>vm_size_t</strong> <var>size</var><strong>);</strong> 11*2c2f96dcSApple OSS Distributions</pre> 12*2c2f96dcSApple OSS Distributions<h3>PARAMETERS</h3> 13*2c2f96dcSApple OSS Distributions<dl> 14*2c2f96dcSApple OSS Distributions<p> 15*2c2f96dcSApple OSS Distributions<dt> <var>memory_control</var> 16*2c2f96dcSApple OSS Distributions<dd> 17*2c2f96dcSApple OSS Distributions[in memory-cache-control send right] 18*2c2f96dcSApple OSS DistributionsThe memory cache control port 19*2c2f96dcSApple OSS Distributionsto be used by the memory manager for cache management requests. 20*2c2f96dcSApple OSS DistributionsThis port is provided by the kernel in a <strong>memory_object_init</strong> or a 21*2c2f96dcSApple OSS Distributions<strong>memory_object_create</strong> call. 22*2c2f96dcSApple OSS Distributions<p> 23*2c2f96dcSApple OSS Distributions<dt> <var>offset</var> 24*2c2f96dcSApple OSS Distributions<dd> 25*2c2f96dcSApple OSS Distributions[in scalar] 26*2c2f96dcSApple OSS DistributionsThe offset within the memory object, in bytes. 27*2c2f96dcSApple OSS Distributions<p> 28*2c2f96dcSApple OSS Distributions<dt> <var>size</var> 29*2c2f96dcSApple OSS Distributions<dd> 30*2c2f96dcSApple OSS Distributions[in scalar] 31*2c2f96dcSApple OSS DistributionsThe number of bytes of data (starting at <var>offset</var>). The number 32*2c2f96dcSApple OSS Distributionsmust convert to an integral number of memory object pages. 33*2c2f96dcSApple OSS Distributions</dl> 34*2c2f96dcSApple OSS Distributions<h3>DESCRIPTION</h3> 35*2c2f96dcSApple OSS Distributions<p> 36*2c2f96dcSApple OSS DistributionsThe <strong>memory_object_data_unavailable</strong> function indicates 37*2c2f96dcSApple OSS Distributionsthat the memory 38*2c2f96dcSApple OSS Distributionsmanager cannot provide the kernel with the data requested for 39*2c2f96dcSApple OSS Distributionsthe given region. 40*2c2f96dcSApple OSS DistributionsInstead, the kernel should provide the data for this region. 41*2c2f96dcSApple OSS Distributions<p> 42*2c2f96dcSApple OSS DistributionsA memory manager can use this call in any of the following situations: 43*2c2f96dcSApple OSS Distributions<ul> 44*2c2f96dcSApple OSS Distributions<li> 45*2c2f96dcSApple OSS DistributionsWhen the object was created by the kernel 46*2c2f96dcSApple OSS Distributions(via <strong>memory_object_create</strong>) and 47*2c2f96dcSApple OSS Distributionsthe kernel has not yet provided data for the region (via either 48*2c2f96dcSApple OSS Distributions<strong>memory_object_data_initialize</strong> or <strong>memory_object_data_return</strong>). 49*2c2f96dcSApple OSS DistributionsIn this case, the 50*2c2f96dcSApple OSS Distributionsobject is a temporary memory object; the memory manager is the default 51*2c2f96dcSApple OSS Distributionsmemory manager; and the kernel should provide zero-filled pages for the 52*2c2f96dcSApple OSS Distributionsobject. 53*2c2f96dcSApple OSS Distributions <p> 54*2c2f96dcSApple OSS Distributions<li> 55*2c2f96dcSApple OSS DistributionsWhen the object is a normal user-created memory object. In this case, the 56*2c2f96dcSApple OSS Distributionskernel should provide zero-filled pages for the region. 57*2c2f96dcSApple OSS Distributions</ul> 58*2c2f96dcSApple OSS Distributions<h3>RETURN VALUES</h3> 59*2c2f96dcSApple OSS Distributions<p> 60*2c2f96dcSApple OSS DistributionsOnly generic errors apply. 61*2c2f96dcSApple OSS Distributions<h3>RELATED INFORMATION</h3> 62*2c2f96dcSApple OSS Distributions<p> 63*2c2f96dcSApple OSS DistributionsFunctions: 64*2c2f96dcSApple OSS Distributions<a href="memory_object_create.html"><strong>memory_object_create</strong></a>, 65*2c2f96dcSApple OSS Distributions<a href="memory_object_data_error.html"><strong>memory_object_data_error</strong></a>, 66*2c2f96dcSApple OSS Distributions<a href="memory_object_data_request.html"><strong>memory_object_data_request</strong></a>, 67*2c2f96dcSApple OSS Distributions<a href="memory_object_data_supply.html"><strong>memory_object_data_supply</strong></a>. 68