1*5c2921b0SApple OSS Distributions<h2>memory_object_data_error</h2> 2*5c2921b0SApple OSS Distributions<hr> 3*5c2921b0SApple OSS Distributions<p> 4*5c2921b0SApple OSS Distributions<strong>Function</strong> - An error prevents the supply of previously requested data. 5*5c2921b0SApple OSS Distributions<h3>SYNOPSIS</h3> 6*5c2921b0SApple OSS Distributions<pre> 7*5c2921b0SApple OSS Distributions<strong>kern_return_t memory_object_data_error</strong> 8*5c2921b0SApple OSS Distributions <strong>(memory_object_control_t</strong> <var>memory_control</var>, 9*5c2921b0SApple OSS Distributions <strong>vm_offset_t</strong> <var>offset</var>, 10*5c2921b0SApple OSS Distributions <strong>vm_size_t</strong> <var>size</var>, 11*5c2921b0SApple OSS Distributions <strong>kern_return_t</strong> <var>reason</var><strong>);</strong> 12*5c2921b0SApple OSS Distributions</pre> 13*5c2921b0SApple OSS Distributions<h3>PARAMETERS</h3> 14*5c2921b0SApple OSS Distributions<dl> 15*5c2921b0SApple OSS Distributions<p> 16*5c2921b0SApple OSS Distributions<dt> <var>memory_control</var> 17*5c2921b0SApple OSS Distributions<dd> 18*5c2921b0SApple OSS Distributions[in memory-cache-control send right] 19*5c2921b0SApple OSS DistributionsThe memory cache control port 20*5c2921b0SApple OSS Distributionsto be used by the memory manager for cache management requests. 21*5c2921b0SApple OSS DistributionsThis port is provided by the kernel in a <strong>memory_object_create</strong> call. 22*5c2921b0SApple OSS Distributions<p> 23*5c2921b0SApple OSS Distributions<dt> <var>offset</var> 24*5c2921b0SApple OSS Distributions<dd> 25*5c2921b0SApple OSS Distributions[in scalar] 26*5c2921b0SApple OSS DistributionsThe offset within the memory object, in bytes. 27*5c2921b0SApple OSS Distributions<p> 28*5c2921b0SApple OSS Distributions<dt> <var>size</var> 29*5c2921b0SApple OSS Distributions<dd> 30*5c2921b0SApple OSS Distributions[in scalar] 31*5c2921b0SApple OSS DistributionsThe number of bytes of data (starting at <var>offset</var>). The number 32*5c2921b0SApple OSS Distributionsmust convert to an integral number of memory object pages. 33*5c2921b0SApple OSS Distributions<p> 34*5c2921b0SApple OSS Distributions<dt> <var>reason</var> 35*5c2921b0SApple OSS Distributions<dd> 36*5c2921b0SApple OSS Distributions[in scalar] 37*5c2921b0SApple OSS DistributionsReason for the error. 38*5c2921b0SApple OSS Distributions</dl> 39*5c2921b0SApple OSS Distributions<h3>DESCRIPTION</h3> 40*5c2921b0SApple OSS Distributions<p> 41*5c2921b0SApple OSS DistributionsThe <strong>memory_object_data_error</strong> function indicates that 42*5c2921b0SApple OSS Distributionsthe memory manager 43*5c2921b0SApple OSS Distributionscannot provide the kernel with the data requested for the given region, 44*5c2921b0SApple OSS Distributionsspecifying a reason for the error. 45*5c2921b0SApple OSS Distributions<p> 46*5c2921b0SApple OSS DistributionsWhen the kernel issues a <strong>memory_object_data_request</strong> call, the memory 47*5c2921b0SApple OSS Distributionsmanager can respond with a <strong>memory_object_data_error</strong> 48*5c2921b0SApple OSS Distributionscall to indicate that the 49*5c2921b0SApple OSS Distributionspage cannot be retrieved, and that a memory failure exception should be raised 50*5c2921b0SApple OSS Distributionsin any client threads that are waiting for the page. Clients 51*5c2921b0SApple OSS Distributionsare permitted to catch 52*5c2921b0SApple OSS Distributionsthese exceptions and retry their page faults. As a result, this 53*5c2921b0SApple OSS Distributionscall can be used to 54*5c2921b0SApple OSS Distributionsreport transient errors as well as permanent ones. A memory manager can use 55*5c2921b0SApple OSS Distributionsthis call for both hardware errors (for example, disk failures) and software 56*5c2921b0SApple OSS Distributionserrors (for example, accessing data that does not exist or is protected). 57*5c2921b0SApple OSS Distributions<h3>NOTES</h3> 58*5c2921b0SApple OSS Distributions<p> 59*5c2921b0SApple OSS DistributionsIf reason has a system code of <var>err_kern</var>, the kernel will substitute 60*5c2921b0SApple OSS Distributionsan error value 61*5c2921b0SApple OSS Distributionsof <strong>KERN_MEMORY_ERROR</strong>. 62*5c2921b0SApple OSS Distributions<h3>RETURN VALUES</h3> 63*5c2921b0SApple OSS Distributions<p> 64*5c2921b0SApple OSS DistributionsOnly generic errors apply. 65*5c2921b0SApple OSS Distributions<h3>RELATED INFORMATION</h3> 66*5c2921b0SApple OSS Distributions<p> 67*5c2921b0SApple OSS DistributionsFunctions: 68*5c2921b0SApple OSS Distributions<a href="memory_object_data_request.html"><strong>memory_object_data_request</strong></a>, 69*5c2921b0SApple OSS Distributions<a href="memory_object_data_supply.html"><strong>memory_object_data_supply</strong></a>, 70*5c2921b0SApple OSS Distributions<a href="MO_data_unavailable.html"><strong>memory_object_data_unavailable</strong></a>. 71