#include <db.h>
int
DB_ENV->log_put(DB_ENV *env,
DB_LSN *lsn, const DBT *data, u_int32_t flags);
The DB_ENV->log_put() method appends records to the log. The
DB_LSN of the put record is
returned in the lsn parameter.
The DB_ENV->log_put()
method returns a non-zero error value on failure and 0 on success.
The data parameter is the record to write to the log.
The caller is responsible for providing any necessary structure to data. (For example, in a write-ahead logging protocol, the application must understand what part of data is an operation code, what part is redo information, and what part is undo information. In addition, most transaction managers will store in data the DB_LSN of the previous log record for the same transaction, to support chaining back through the transaction's log records during undo.)
The flags parameter must be set to 0 or the following value:
The log is forced to disk after this record is written, guaranteeing
that all records with DB_LSN
values less than or equal to the one being "put" are on disk
before DB_ENV->log_put() returns.
The lsn parameter references memory into which the DB_LSN of the put record is copied.
The DB_ENV->log_put()
method may fail and return one of the following non-zero errors: