VM Error Diagnostics

The VM mathematical functions incorporate the error handling mechanism, which is controlled by the following service functions:


vmlGetErrStatus , vmlSetErrStatus , vmlClearErrStatus	These functions operate with a global variable called VM Error Status. The VM Error Status flags an error, a warning, or a successful execution of a VM function.
vmlGetErrCallBack , vmlSetErrCallBack , vmlClearErrCallBack	These functions enable you to customize the error handling. For example, you can identify a particular argument in a vector where an error occurred or that caused a warning.
vmlSetMode , vmlGetMode	These functions get and set a VM mode. If you set a new VM mode using the vmlSetMode function, you can store the previous VM mode returned by the routine and restore it at any point of your application.

If both an error and a warning situation occur during the function call, the VM Error Status variable keeps only the value of the error code.

for possible values. If a VM function does not encounter errors or warnings, it sets the VM Error Status to VML_STATUS_OK.

If you use incorrect input arguments to a VM function (VML_STATUS_BADSIZE and VML_STATUS_BADMEM), the function calls

xerbla

to report errors.

for details

You can use the

vmlSetMode

and

vmlGetMode

functions to modify error handling behavior. Depending on the VM mode, the error handling behavior includes the following operations:

setting the VM Error Status to a value corresponding to the observed error or warning

setting the

errno

variable to one of the values described in Table

writing error text information to the

stderr

stream

raising the appropriate exception on an error, if necessary

calling the additional error handler callback function that is set by

vmlSetErrorCallBack

Set Values of the
errno
Variable
Value of errno	Description
0	No errors are detected.
EINVAL	The array dimension is not positive.
EACCES	`NULL` pointer is passed.
EDOM	At least one of array values is out of a range of definition.
ERANGE	At least one of array values caused a singularity, overflow or underflow.

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