1*33de042dSApple OSS Distributions<h2>memory_object_data_error</h2> 2*33de042dSApple OSS Distributions<hr> 3*33de042dSApple OSS Distributions<p> 4*33de042dSApple OSS Distributions<strong>Function</strong> - An error prevents the supply of previously requested data. 5*33de042dSApple OSS Distributions<h3>SYNOPSIS</h3> 6*33de042dSApple OSS Distributions<pre> 7*33de042dSApple OSS Distributions<strong>kern_return_t memory_object_data_error</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>, 11*33de042dSApple OSS Distributions <strong>kern_return_t</strong> <var>reason</var><strong>);</strong> 12*33de042dSApple OSS Distributions</pre> 13*33de042dSApple OSS Distributions<h3>PARAMETERS</h3> 14*33de042dSApple OSS Distributions<dl> 15*33de042dSApple OSS Distributions<p> 16*33de042dSApple OSS Distributions<dt> <var>memory_control</var> 17*33de042dSApple OSS Distributions<dd> 18*33de042dSApple OSS Distributions[in memory-cache-control send right] 19*33de042dSApple OSS DistributionsThe memory cache control port 20*33de042dSApple OSS Distributionsto be used by the memory manager for cache management requests. 21*33de042dSApple OSS DistributionsThis port is provided by the kernel in a <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<p> 34*33de042dSApple OSS Distributions<dt> <var>reason</var> 35*33de042dSApple OSS Distributions<dd> 36*33de042dSApple OSS Distributions[in scalar] 37*33de042dSApple OSS DistributionsReason for the error. 38*33de042dSApple OSS Distributions</dl> 39*33de042dSApple OSS Distributions<h3>DESCRIPTION</h3> 40*33de042dSApple OSS Distributions<p> 41*33de042dSApple OSS DistributionsThe <strong>memory_object_data_error</strong> function indicates that 42*33de042dSApple OSS Distributionsthe memory manager 43*33de042dSApple OSS Distributionscannot provide the kernel with the data requested for the given region, 44*33de042dSApple OSS Distributionsspecifying a reason for the error. 45*33de042dSApple OSS Distributions<p> 46*33de042dSApple OSS DistributionsWhen the kernel issues a <strong>memory_object_data_request</strong> call, the memory 47*33de042dSApple OSS Distributionsmanager can respond with a <strong>memory_object_data_error</strong> 48*33de042dSApple OSS Distributionscall to indicate that the 49*33de042dSApple OSS Distributionspage cannot be retrieved, and that a memory failure exception should be raised 50*33de042dSApple OSS Distributionsin any client threads that are waiting for the page. Clients 51*33de042dSApple OSS Distributionsare permitted to catch 52*33de042dSApple OSS Distributionsthese exceptions and retry their page faults. As a result, this 53*33de042dSApple OSS Distributionscall can be used to 54*33de042dSApple OSS Distributionsreport transient errors as well as permanent ones. A memory manager can use 55*33de042dSApple OSS Distributionsthis call for both hardware errors (for example, disk failures) and software 56*33de042dSApple OSS Distributionserrors (for example, accessing data that does not exist or is protected). 57*33de042dSApple OSS Distributions<h3>NOTES</h3> 58*33de042dSApple OSS Distributions<p> 59*33de042dSApple OSS DistributionsIf reason has a system code of <var>err_kern</var>, the kernel will substitute 60*33de042dSApple OSS Distributionsan error value 61*33de042dSApple OSS Distributionsof <strong>KERN_MEMORY_ERROR</strong>. 62*33de042dSApple OSS Distributions<h3>RETURN VALUES</h3> 63*33de042dSApple OSS Distributions<p> 64*33de042dSApple OSS DistributionsOnly generic errors apply. 65*33de042dSApple OSS Distributions<h3>RELATED INFORMATION</h3> 66*33de042dSApple OSS Distributions<p> 67*33de042dSApple OSS DistributionsFunctions: 68*33de042dSApple OSS Distributions<a href="memory_object_data_request.html"><strong>memory_object_data_request</strong></a>, 69*33de042dSApple OSS Distributions<a href="memory_object_data_supply.html"><strong>memory_object_data_supply</strong></a>, 70*33de042dSApple OSS Distributions<a href="MO_data_unavailable.html"><strong>memory_object_data_unavailable</strong></a>. 71