+I'Berkeley DB: DbLog::file[P

DbLog::file





#include <db_cxx.h>

int7DbLog::file(const DbLsn *lsn, char *namep, size_t len);





Description



The DbLog::file method maps:DbLsn objectsto file names,Fcopying the name of the file containing the record named by lsn4into the memory location referenced by namep.

JThe len argument is the length of the namep buffer in bytes.DIf namep is too short to hold the file name, DbLog::file willreturn ENOMEM.I(Log file names are normally quite short, on the order of 10 characters.)

This mapping of:DbLsn objects?to files is needed for database administration. For example, a2transaction manager typically records the earliest2DbLsnFneeded for restart, and the database administrator may want to archive(log files to tape when they contain only2DbLsn3entries before the earliest one needed for restart.

The DbLog::file>method either returns errno or throws an exception that:encapsulates an errno on failure, and 0 on success.



Errors

RIf a fatal error occurs in Berkeley DB, the DbLog::file method may fail and eitherIreturn DB_RUNRECOVERY or throw an exception encapsulating DB_RUNRECOVERY,Gat which point all subsequent database calls will also fail in the sameFway. Methods marked as returning errno will, by default, throwHan exception that encapsulates the error information. The default error\behavior can be changed, see DbException.

The DbLog::file&method may fail and throw an exceptionKfor any of the errors specified for the following Berkeley DB and C library functions: abort(3), close(3), fcntl(3), fflush(3), fprintf(3),free(3), getenv(3), getpid(3), getuid(3), isdigit(3), malloc(3), memcpy(3), memset(3),open(3),sigfillset(3),sigprocmask(3), snprintf(3),stat(3), strcpy(3), strerror(3), strlen(3), unlink(3), vfprintf(3),and vsnprintf(3).

In addition, the DbLog::file&method may fail and throw an exceptionor return errnofor the following conditions:

M

ENOMEM
The supplied buffer was too small to hold the log file name.




Class

2DbLog



See Also

>DbLog::archive,:DbLog::close,>DbLog::compare, DbLog::file,:DbLog::flush,6DbLog::get,8DbLog::open,6DbLog::put,FDbLog::db_register,8DbLog::stat,;DbLog::unlinkandJDbLog::db_unregister.
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