1*2c2f96dcSApple OSS Distributions<h2>memory_object_data_error</h2> 2*2c2f96dcSApple OSS Distributions<hr> 3*2c2f96dcSApple OSS Distributions<p> 4*2c2f96dcSApple OSS Distributions<strong>Function</strong> - An error prevents the supply of previously requested data. 5*2c2f96dcSApple OSS Distributions<h3>SYNOPSIS</h3> 6*2c2f96dcSApple OSS Distributions<pre> 7*2c2f96dcSApple OSS Distributions<strong>kern_return_t memory_object_data_error</strong> 8*2c2f96dcSApple OSS Distributions <strong>(memory_object_control_t</strong> <var>memory_control</var>, 9*2c2f96dcSApple OSS Distributions <strong>vm_offset_t</strong> <var>offset</var>, 10*2c2f96dcSApple OSS Distributions <strong>vm_size_t</strong> <var>size</var>, 11*2c2f96dcSApple OSS Distributions <strong>kern_return_t</strong> <var>reason</var><strong>);</strong> 12*2c2f96dcSApple OSS Distributions</pre> 13*2c2f96dcSApple OSS Distributions<h3>PARAMETERS</h3> 14*2c2f96dcSApple OSS Distributions<dl> 15*2c2f96dcSApple OSS Distributions<p> 16*2c2f96dcSApple OSS Distributions<dt> <var>memory_control</var> 17*2c2f96dcSApple OSS Distributions<dd> 18*2c2f96dcSApple OSS Distributions[in memory-cache-control send right] 19*2c2f96dcSApple OSS DistributionsThe memory cache control port 20*2c2f96dcSApple OSS Distributionsto be used by the memory manager for cache management requests. 21*2c2f96dcSApple OSS DistributionsThis port is provided by the kernel in a <strong>memory_object_create</strong> call. 22*2c2f96dcSApple OSS Distributions<p> 23*2c2f96dcSApple OSS Distributions<dt> <var>offset</var> 24*2c2f96dcSApple OSS Distributions<dd> 25*2c2f96dcSApple OSS Distributions[in scalar] 26*2c2f96dcSApple OSS DistributionsThe offset within the memory object, in bytes. 27*2c2f96dcSApple OSS Distributions<p> 28*2c2f96dcSApple OSS Distributions<dt> <var>size</var> 29*2c2f96dcSApple OSS Distributions<dd> 30*2c2f96dcSApple OSS Distributions[in scalar] 31*2c2f96dcSApple OSS DistributionsThe number of bytes of data (starting at <var>offset</var>). The number 32*2c2f96dcSApple OSS Distributionsmust convert to an integral number of memory object pages. 33*2c2f96dcSApple OSS Distributions<p> 34*2c2f96dcSApple OSS Distributions<dt> <var>reason</var> 35*2c2f96dcSApple OSS Distributions<dd> 36*2c2f96dcSApple OSS Distributions[in scalar] 37*2c2f96dcSApple OSS DistributionsReason for the error. 38*2c2f96dcSApple OSS Distributions</dl> 39*2c2f96dcSApple OSS Distributions<h3>DESCRIPTION</h3> 40*2c2f96dcSApple OSS Distributions<p> 41*2c2f96dcSApple OSS DistributionsThe <strong>memory_object_data_error</strong> function indicates that 42*2c2f96dcSApple OSS Distributionsthe memory manager 43*2c2f96dcSApple OSS Distributionscannot provide the kernel with the data requested for the given region, 44*2c2f96dcSApple OSS Distributionsspecifying a reason for the error. 45*2c2f96dcSApple OSS Distributions<p> 46*2c2f96dcSApple OSS DistributionsWhen the kernel issues a <strong>memory_object_data_request</strong> call, the memory 47*2c2f96dcSApple OSS Distributionsmanager can respond with a <strong>memory_object_data_error</strong> 48*2c2f96dcSApple OSS Distributionscall to indicate that the 49*2c2f96dcSApple OSS Distributionspage cannot be retrieved, and that a memory failure exception should be raised 50*2c2f96dcSApple OSS Distributionsin any client threads that are waiting for the page. Clients 51*2c2f96dcSApple OSS Distributionsare permitted to catch 52*2c2f96dcSApple OSS Distributionsthese exceptions and retry their page faults. As a result, this 53*2c2f96dcSApple OSS Distributionscall can be used to 54*2c2f96dcSApple OSS Distributionsreport transient errors as well as permanent ones. A memory manager can use 55*2c2f96dcSApple OSS Distributionsthis call for both hardware errors (for example, disk failures) and software 56*2c2f96dcSApple OSS Distributionserrors (for example, accessing data that does not exist or is protected). 57*2c2f96dcSApple OSS Distributions<h3>NOTES</h3> 58*2c2f96dcSApple OSS Distributions<p> 59*2c2f96dcSApple OSS DistributionsIf reason has a system code of <var>err_kern</var>, the kernel will substitute 60*2c2f96dcSApple OSS Distributionsan error value 61*2c2f96dcSApple OSS Distributionsof <strong>KERN_MEMORY_ERROR</strong>. 62*2c2f96dcSApple OSS Distributions<h3>RETURN VALUES</h3> 63*2c2f96dcSApple OSS Distributions<p> 64*2c2f96dcSApple OSS DistributionsOnly generic errors apply. 65*2c2f96dcSApple OSS Distributions<h3>RELATED INFORMATION</h3> 66*2c2f96dcSApple OSS Distributions<p> 67*2c2f96dcSApple OSS DistributionsFunctions: 68*2c2f96dcSApple OSS Distributions<a href="memory_object_data_request.html"><strong>memory_object_data_request</strong></a>, 69*2c2f96dcSApple OSS Distributions<a href="memory_object_data_supply.html"><strong>memory_object_data_supply</strong></a>, 70*2c2f96dcSApple OSS Distributions<a href="MO_data_unavailable.html"><strong>memory_object_data_unavailable</strong></a>. 71