Return and reason code considerations

On IXGBRWSE REQUEST=READCURSOR requests, more than one log block may be returned to the requestor. Logger may encounter different conditions for different log blocks.

The following return and reason codes may be issued to indicate the particular condition:

IXGBRWSE MODE=SYNCECB or MODE=SYNCEXIT requests that are processed asynchronously will result in a return code of X'04' and a reason code of X'401', and will be handled in the same manner as MULTIBLOCK=NO requests.
When an IXGBRWSE request results in a return code of X'0' with a reason code of X'0', then the return and reason codes are always 0 for each IXGBMRLT for the log blocks, and data is always returned.
When an IXGBRWSE request results in a return code of X'04' with a reason code of X'416', data is always returned. Any combination of return code X'04' and reason code X'4xx' or return code X'00' and reason code X'000' may be returned in the output buffer area.
If a return code of X'04' with a reason code of X'417' is returned, then only the last IXGBMRLT has a return code of X'08'. There may be an earlier log record with an IXGBMRLT return code X'04' and reason code X'4xx'.
It is possible to have some log records read back and then get an IXGBRMLT return and reason code that requires a wait for an ENF 48 event. The IXGBRWSE return code would be X'04' with a reason code of X'417', and the last IXGBRMLT would contain the ENF 48 condition (8/8xx).
When the browse request reaches the end of log after moving some data into the buffer, the last IXGBRMLT will have a return code of X'08' with a reason code of X'848' and IXGBRWSE will have a return code of X'04' with a reason code of X'417'. If another IXGBRWSE is issued and there are still no more log records to read, the IXGBRWSE service will have a return code of X'08' with a reason code of X'848'. The buffer area is undefined for this return/reason code, so you cannot trust its contents.