1*27b03b36SApple OSS Distributions<h2>memory_object_data_error</h2> 2*27b03b36SApple OSS Distributions<hr> 3*27b03b36SApple OSS Distributions<p> 4*27b03b36SApple OSS Distributions<strong>Function</strong> - An error prevents the supply of previously requested data. 5*27b03b36SApple OSS Distributions<h3>SYNOPSIS</h3> 6*27b03b36SApple OSS Distributions<pre> 7*27b03b36SApple OSS Distributions<strong>kern_return_t memory_object_data_error</strong> 8*27b03b36SApple OSS Distributions <strong>(memory_object_control_t</strong> <var>memory_control</var>, 9*27b03b36SApple OSS Distributions <strong>vm_offset_t</strong> <var>offset</var>, 10*27b03b36SApple OSS Distributions <strong>vm_size_t</strong> <var>size</var>, 11*27b03b36SApple OSS Distributions <strong>kern_return_t</strong> <var>reason</var><strong>);</strong> 12*27b03b36SApple OSS Distributions</pre> 13*27b03b36SApple OSS Distributions<h3>PARAMETERS</h3> 14*27b03b36SApple OSS Distributions<dl> 15*27b03b36SApple OSS Distributions<p> 16*27b03b36SApple OSS Distributions<dt> <var>memory_control</var> 17*27b03b36SApple OSS Distributions<dd> 18*27b03b36SApple OSS Distributions[in memory-cache-control send right] 19*27b03b36SApple OSS DistributionsThe memory cache control port 20*27b03b36SApple OSS Distributionsto be used by the memory manager for cache management requests. 21*27b03b36SApple OSS DistributionsThis port is provided by the kernel in a <strong>memory_object_create</strong> call. 22*27b03b36SApple OSS Distributions<p> 23*27b03b36SApple OSS Distributions<dt> <var>offset</var> 24*27b03b36SApple OSS Distributions<dd> 25*27b03b36SApple OSS Distributions[in scalar] 26*27b03b36SApple OSS DistributionsThe offset within the memory object, in bytes. 27*27b03b36SApple OSS Distributions<p> 28*27b03b36SApple OSS Distributions<dt> <var>size</var> 29*27b03b36SApple OSS Distributions<dd> 30*27b03b36SApple OSS Distributions[in scalar] 31*27b03b36SApple OSS DistributionsThe number of bytes of data (starting at <var>offset</var>). The number 32*27b03b36SApple OSS Distributionsmust convert to an integral number of memory object pages. 33*27b03b36SApple OSS Distributions<p> 34*27b03b36SApple OSS Distributions<dt> <var>reason</var> 35*27b03b36SApple OSS Distributions<dd> 36*27b03b36SApple OSS Distributions[in scalar] 37*27b03b36SApple OSS DistributionsReason for the error. 38*27b03b36SApple OSS Distributions</dl> 39*27b03b36SApple OSS Distributions<h3>DESCRIPTION</h3> 40*27b03b36SApple OSS Distributions<p> 41*27b03b36SApple OSS DistributionsThe <strong>memory_object_data_error</strong> function indicates that 42*27b03b36SApple OSS Distributionsthe memory manager 43*27b03b36SApple OSS Distributionscannot provide the kernel with the data requested for the given region, 44*27b03b36SApple OSS Distributionsspecifying a reason for the error. 45*27b03b36SApple OSS Distributions<p> 46*27b03b36SApple OSS DistributionsWhen the kernel issues a <strong>memory_object_data_request</strong> call, the memory 47*27b03b36SApple OSS Distributionsmanager can respond with a <strong>memory_object_data_error</strong> 48*27b03b36SApple OSS Distributionscall to indicate that the 49*27b03b36SApple OSS Distributionspage cannot be retrieved, and that a memory failure exception should be raised 50*27b03b36SApple OSS Distributionsin any client threads that are waiting for the page. Clients 51*27b03b36SApple OSS Distributionsare permitted to catch 52*27b03b36SApple OSS Distributionsthese exceptions and retry their page faults. As a result, this 53*27b03b36SApple OSS Distributionscall can be used to 54*27b03b36SApple OSS Distributionsreport transient errors as well as permanent ones. A memory manager can use 55*27b03b36SApple OSS Distributionsthis call for both hardware errors (for example, disk failures) and software 56*27b03b36SApple OSS Distributionserrors (for example, accessing data that does not exist or is protected). 57*27b03b36SApple OSS Distributions<h3>NOTES</h3> 58*27b03b36SApple OSS Distributions<p> 59*27b03b36SApple OSS DistributionsIf reason has a system code of <var>err_kern</var>, the kernel will substitute 60*27b03b36SApple OSS Distributionsan error value 61*27b03b36SApple OSS Distributionsof <strong>KERN_MEMORY_ERROR</strong>. 62*27b03b36SApple OSS Distributions<h3>RETURN VALUES</h3> 63*27b03b36SApple OSS Distributions<p> 64*27b03b36SApple OSS DistributionsOnly generic errors apply. 65*27b03b36SApple OSS Distributions<h3>RELATED INFORMATION</h3> 66*27b03b36SApple OSS Distributions<p> 67*27b03b36SApple OSS DistributionsFunctions: 68*27b03b36SApple OSS Distributions<a href="memory_object_data_request.html"><strong>memory_object_data_request</strong></a>, 69*27b03b36SApple OSS Distributions<a href="memory_object_data_supply.html"><strong>memory_object_data_supply</strong></a>, 70*27b03b36SApple OSS Distributions<a href="MO_data_unavailable.html"><strong>memory_object_data_unavailable</strong></a>. 71