1*33de042dSApple OSS Distributions<h2>memory_object_data_unavailable</h2> 2*33de042dSApple OSS Distributions<hr> 3*33de042dSApple OSS Distributions<p> 4*33de042dSApple OSS Distributions<strong>Function</strong> - Instruct kernel to zero-fill pages as requested data does not exist. 5*33de042dSApple OSS Distributions<h3>SYNOPSIS</h3> 6*33de042dSApple OSS Distributions<pre> 7*33de042dSApple OSS Distributions<strong>kern_return_t memory_object_data_unavailable</strong> 8*33de042dSApple OSS Distributions <strong>(memory_object_control_t</strong> <var>memory_control</var>, 9*33de042dSApple OSS Distributions <strong>vm_offset_t</strong> <var>offset</var>, 10*33de042dSApple OSS Distributions <strong>vm_size_t</strong> <var>size</var><strong>);</strong> 11*33de042dSApple OSS Distributions</pre> 12*33de042dSApple OSS Distributions<h3>PARAMETERS</h3> 13*33de042dSApple OSS Distributions<dl> 14*33de042dSApple OSS Distributions<p> 15*33de042dSApple OSS Distributions<dt> <var>memory_control</var> 16*33de042dSApple OSS Distributions<dd> 17*33de042dSApple OSS Distributions[in memory-cache-control send right] 18*33de042dSApple OSS DistributionsThe memory cache control port 19*33de042dSApple OSS Distributionsto be used by the memory manager for cache management requests. 20*33de042dSApple OSS DistributionsThis port is provided by the kernel in a <strong>memory_object_init</strong> or a 21*33de042dSApple OSS Distributions<strong>memory_object_create</strong> call. 22*33de042dSApple OSS Distributions<p> 23*33de042dSApple OSS Distributions<dt> <var>offset</var> 24*33de042dSApple OSS Distributions<dd> 25*33de042dSApple OSS Distributions[in scalar] 26*33de042dSApple OSS DistributionsThe offset within the memory object, in bytes. 27*33de042dSApple OSS Distributions<p> 28*33de042dSApple OSS Distributions<dt> <var>size</var> 29*33de042dSApple OSS Distributions<dd> 30*33de042dSApple OSS Distributions[in scalar] 31*33de042dSApple OSS DistributionsThe number of bytes of data (starting at <var>offset</var>). The number 32*33de042dSApple OSS Distributionsmust convert to an integral number of memory object pages. 33*33de042dSApple OSS Distributions</dl> 34*33de042dSApple OSS Distributions<h3>DESCRIPTION</h3> 35*33de042dSApple OSS Distributions<p> 36*33de042dSApple OSS DistributionsThe <strong>memory_object_data_unavailable</strong> function indicates 37*33de042dSApple OSS Distributionsthat the memory 38*33de042dSApple OSS Distributionsmanager cannot provide the kernel with the data requested for 39*33de042dSApple OSS Distributionsthe given region. 40*33de042dSApple OSS DistributionsInstead, the kernel should provide the data for this region. 41*33de042dSApple OSS Distributions<p> 42*33de042dSApple OSS DistributionsA memory manager can use this call in any of the following situations: 43*33de042dSApple OSS Distributions<ul> 44*33de042dSApple OSS Distributions<li> 45*33de042dSApple OSS DistributionsWhen the object was created by the kernel 46*33de042dSApple OSS Distributions(via <strong>memory_object_create</strong>) and 47*33de042dSApple OSS Distributionsthe kernel has not yet provided data for the region (via either 48*33de042dSApple OSS Distributions<strong>memory_object_data_initialize</strong> or <strong>memory_object_data_return</strong>). 49*33de042dSApple OSS DistributionsIn this case, the 50*33de042dSApple OSS Distributionsobject is a temporary memory object; the memory manager is the default 51*33de042dSApple OSS Distributionsmemory manager; and the kernel should provide zero-filled pages for the 52*33de042dSApple OSS Distributionsobject. 53*33de042dSApple OSS Distributions <p> 54*33de042dSApple OSS Distributions<li> 55*33de042dSApple OSS DistributionsWhen the object is a normal user-created memory object. In this case, the 56*33de042dSApple OSS Distributionskernel should provide zero-filled pages for the region. 57*33de042dSApple OSS Distributions</ul> 58*33de042dSApple OSS Distributions<h3>RETURN VALUES</h3> 59*33de042dSApple OSS Distributions<p> 60*33de042dSApple OSS DistributionsOnly generic errors apply. 61*33de042dSApple OSS Distributions<h3>RELATED INFORMATION</h3> 62*33de042dSApple OSS Distributions<p> 63*33de042dSApple OSS DistributionsFunctions: 64*33de042dSApple OSS Distributions<a href="memory_object_create.html"><strong>memory_object_create</strong></a>, 65*33de042dSApple OSS Distributions<a href="memory_object_data_error.html"><strong>memory_object_data_error</strong></a>, 66*33de042dSApple OSS Distributions<a href="memory_object_data_request.html"><strong>memory_object_data_request</strong></a>, 67*33de042dSApple OSS Distributions<a href="memory_object_data_supply.html"><strong>memory_object_data_supply</strong></a>. 68