TDB_DATA typedef if you want portability between the two.
- tdb2 functions return 0 on success, and a negative error on failure,
- whereas tdb1 functions returned 0 on success, and -1 on failure. tdb1
- then used tdb_error() to determine the error.
+ whereas tdb1 functions returned 0 on success, and -1 on failure.
+ tdb1 then used tdb_error() to determine the error; this is also
+ supported in tdb2 to ease backwards compatibility, though the other
+ form is preferred.
- tdb2's tdb_fetch() returns an error, tdb1's returned the data directly
(or tdb_null, and you were supposed to check tdb_error() to find out why).