### DB_ENV->log_file

`

###

    #include <db.h>

    int
    DB_ENV->log_file(DB_ENV *env,
        const DB_LSN *lsn, char *namep, size_t len);

### Description: DB_ENV->log_file

The DB_ENV->log_file method maps DB_LSN structures to filenames, returning the name of the file containing the record named by lsn.

This mapping of DB_LSN structures to files is needed for database administration. For example, a transaction manager typically records the earliest DB_LSN needed for restart, and the database administrator may want to archive log files to tape when they contain only DB_LSN entries before the earliest one needed for restart.

The DB_ENV->log_file method returns a non-zero error value on failure and 0 on success.

### Parameters

lsn
  The lsn parameter is the DB_LSN structure for which a filename is wanted.
namep
  The namep parameter references memory into which the name of the file containing the record named by lsn is copied.
len
  The len parameter is the length of the namep buffer in bytes. If namep is too short to hold the filename, DB_ENV->log_file will fail. (Log filenames are normally quite short, on the order of 10 characters.)

### Errors

The DB_ENV->log_file method may fail and return one of the following non-zero errors:

EINVAL
  If supplied buffer was too small to hold the log filename; or if an invalid flag value or parameter was specified.

### Class

DB_ENV, DB_LOGC, DB_LSN

### See Also

Logging Subsystem and Related Methods`

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