Possible memory errors
Memory errors are usually caused by overrunning memory in a UDR.
To avoid common causes of memory errors in a UDR, make sure you
meet the following memory-handling requirements.
| Memory-handling requirement | More information |
|---|---|
| Do not return the NULL-valued pointer from a UDR. | Return a NULL value |
| Do not use null-terminated strings as data in a varying-length structure such as mi_lvarchar. | Varying-length data and null termination |
| Do not return local variables from a UDR. | Return a value |
| Make sure that you handle data types for parameters and return values with the correct passing mechanism. | The MI_DATUM arguments and Return a value |
| Make sure memory that a UDR allocates is of the appropriate memory duration for its use. Do not access memory after its duration has expired. | Choose the memory duration |