The EXCEPTIONREPORTRECORD data structure describes an exception and any additional parameters associated with the exception. The data structure contains fields for the following information:

• Exception number
  
• Exception flags, describing exception attributes
  
• A pointer to a nested exception report record, if any
  
• The address where the exception occurred
  
• Information for any additional parameters.

For descriptions of the system exceptions see the Control Program Programming Reference.

Following are the flags that are set to indicate exception attributes. Only the EH_NONCONTINUABLE flag can be set (but not cleared) by the user. All other flags are set by the system.

EH_NONCONTINUABLE (0x1)

The exception is not continuable, and any attempt to continue causes the exception XCPT_NONCONTINUABLE_EXCEPTION to be raised.

The EXCEPTIONREPORTRECORD data structure describes an exception for which an unwind is in progress.

An exit unwind operation implies that call frames are being unwound until the base of the stack is reached. Note that EH_UNWINDING is also set.

Following are causes for this flag to be set:

• The user stack exceeds the limits specified by the Thread Information Block. Applications can get the Thread Information Block by calling DosGetInfoBlocks.

• A call frame exceeds the stack limits specified by the Thread Information Block.

• A call frame is not aligned on the stack.
This flag is set only when the EXCEPTIONREPORTRECORD is passed to an associated debugger. It is not possible to build exception information on the user's stack when the stack is invalid.

EXCEPTIONREPORTRECORD describes an exception raised while the current exception handler was active. That is, a nested exception is in progress, and the current handler was also called to handle the previous exception.

EXCEPTIONREPORTRECORD data structures can be chained together to provide additional information when nested exceptions are raised.