int db_env_set_func_fsync(int (*func_fsync)(int fd));
Replace Berkeley DB calls to the IEEE/ANSI Std 1003.1 (POSIX) fsync interface with func_fsync, which must conform to the standard interface.
The db_env_set_func_fsync method configures all operations performed by a process and all of its threads of control, not operations confined to a single database environment.
Although the db_env_set_func_fsync interface may be called at any time during the life of the application, it should normally be called before making calls to the db_env_create or db_create methods.
The db_env_set_func_fsync method returns a non-zero error value on failure and 0 on success.
The db_env_set_func_fsync method may fail and return a non-zero error for the following conditions:
The db_env_set_func_fsync method may fail and return a non-zero error for errors specified for other Berkeley DB and C library or system functions. If a catastrophic error has occurred, the db_env_set_func_fsync method may fail and return DB_RUNRECOVERY, in which case all subsequent Berkeley DB calls will fail in the same way.
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