The RTCHECK option specifies that extra code is generated to force the ERROR condition to be raised if a null pointer is dereferenced, that is, if the pointer is used to change or obtain the value of a variable.
.-NONULLPTR-. >>-RTCHECK--(--+-NULLPTR---+--)-------------------------------->< '-NULL370---'
- NULLPTR
- Extra code is generated to force the ERROR condition to be raised if a null pointer, that is, a pointer equal to SYSNULL(), is dereferenced. To use NULLPTR, you must specify ARCH(8).
- NULL370
- Extra code is generated to force the ERROR condition to be raised if a pointer equal to the old NULL() value is dereferenced. The old NULL() value is the hexadecimal value of 'FF000000'x. To use NULL370, you must specify ARCH(8) or greater.
- NONULLPTR
- No extra code is generated to force the ERROR condition to be raised if a null pointer is dereferenced.
The default is RTCHECK(NONULLPTR).
Note: When a null pointer is dereferenced, a compare-and-trap
data exception occurs.