1*699cd480SApple OSS Distributions<h2>memory_object_data_error</h2> 2*699cd480SApple OSS Distributions<hr> 3*699cd480SApple OSS Distributions<p> 4*699cd480SApple OSS Distributions<strong>Function</strong> - An error prevents the supply of previously requested data. 5*699cd480SApple OSS Distributions<h3>SYNOPSIS</h3> 6*699cd480SApple OSS Distributions<pre> 7*699cd480SApple OSS Distributions<strong>kern_return_t memory_object_data_error</strong> 8*699cd480SApple OSS Distributions <strong>(memory_object_control_t</strong> <var>memory_control</var>, 9*699cd480SApple OSS Distributions <strong>vm_offset_t</strong> <var>offset</var>, 10*699cd480SApple OSS Distributions <strong>vm_size_t</strong> <var>size</var>, 11*699cd480SApple OSS Distributions <strong>kern_return_t</strong> <var>reason</var><strong>);</strong> 12*699cd480SApple OSS Distributions</pre> 13*699cd480SApple OSS Distributions<h3>PARAMETERS</h3> 14*699cd480SApple OSS Distributions<dl> 15*699cd480SApple OSS Distributions<p> 16*699cd480SApple OSS Distributions<dt> <var>memory_control</var> 17*699cd480SApple OSS Distributions<dd> 18*699cd480SApple OSS Distributions[in memory-cache-control send right] 19*699cd480SApple OSS DistributionsThe memory cache control port 20*699cd480SApple OSS Distributionsto be used by the memory manager for cache management requests. 21*699cd480SApple OSS DistributionsThis port is provided by the kernel in a <strong>memory_object_create</strong> call. 22*699cd480SApple OSS Distributions<p> 23*699cd480SApple OSS Distributions<dt> <var>offset</var> 24*699cd480SApple OSS Distributions<dd> 25*699cd480SApple OSS Distributions[in scalar] 26*699cd480SApple OSS DistributionsThe offset within the memory object, in bytes. 27*699cd480SApple OSS Distributions<p> 28*699cd480SApple OSS Distributions<dt> <var>size</var> 29*699cd480SApple OSS Distributions<dd> 30*699cd480SApple OSS Distributions[in scalar] 31*699cd480SApple OSS DistributionsThe number of bytes of data (starting at <var>offset</var>). The number 32*699cd480SApple OSS Distributionsmust convert to an integral number of memory object pages. 33*699cd480SApple OSS Distributions<p> 34*699cd480SApple OSS Distributions<dt> <var>reason</var> 35*699cd480SApple OSS Distributions<dd> 36*699cd480SApple OSS Distributions[in scalar] 37*699cd480SApple OSS DistributionsReason for the error. 38*699cd480SApple OSS Distributions</dl> 39*699cd480SApple OSS Distributions<h3>DESCRIPTION</h3> 40*699cd480SApple OSS Distributions<p> 41*699cd480SApple OSS DistributionsThe <strong>memory_object_data_error</strong> function indicates that 42*699cd480SApple OSS Distributionsthe memory manager 43*699cd480SApple OSS Distributionscannot provide the kernel with the data requested for the given region, 44*699cd480SApple OSS Distributionsspecifying a reason for the error. 45*699cd480SApple OSS Distributions<p> 46*699cd480SApple OSS DistributionsWhen the kernel issues a <strong>memory_object_data_request</strong> call, the memory 47*699cd480SApple OSS Distributionsmanager can respond with a <strong>memory_object_data_error</strong> 48*699cd480SApple OSS Distributionscall to indicate that the 49*699cd480SApple OSS Distributionspage cannot be retrieved, and that a memory failure exception should be raised 50*699cd480SApple OSS Distributionsin any client threads that are waiting for the page. Clients 51*699cd480SApple OSS Distributionsare permitted to catch 52*699cd480SApple OSS Distributionsthese exceptions and retry their page faults. As a result, this 53*699cd480SApple OSS Distributionscall can be used to 54*699cd480SApple OSS Distributionsreport transient errors as well as permanent ones. A memory manager can use 55*699cd480SApple OSS Distributionsthis call for both hardware errors (for example, disk failures) and software 56*699cd480SApple OSS Distributionserrors (for example, accessing data that does not exist or is protected). 57*699cd480SApple OSS Distributions<h3>NOTES</h3> 58*699cd480SApple OSS Distributions<p> 59*699cd480SApple OSS DistributionsIf reason has a system code of <var>err_kern</var>, the kernel will substitute 60*699cd480SApple OSS Distributionsan error value 61*699cd480SApple OSS Distributionsof <strong>KERN_MEMORY_ERROR</strong>. 62*699cd480SApple OSS Distributions<h3>RETURN VALUES</h3> 63*699cd480SApple OSS Distributions<p> 64*699cd480SApple OSS DistributionsOnly generic errors apply. 65*699cd480SApple OSS Distributions<h3>RELATED INFORMATION</h3> 66*699cd480SApple OSS Distributions<p> 67*699cd480SApple OSS DistributionsFunctions: 68*699cd480SApple OSS Distributions<a href="memory_object_data_request.html"><strong>memory_object_data_request</strong></a>, 69*699cd480SApple OSS Distributions<a href="memory_object_data_supply.html"><strong>memory_object_data_supply</strong></a>, 70*699cd480SApple OSS Distributions<a href="MO_data_unavailable.html"><strong>memory_object_data_unavailable</strong></a>. 71