When an error occurs in the Berkeley DB library, a Berkeley DB error or an error
return value is returned by the function. In some cases, however,
the errno value may be insufficient to completely describe
the cause of the error especially during initial application debugging.
The DBENV->set_errcall function is used to enhance the mechanism for reporting error
messages to the application. In some cases, when an error occurs, Berkeley DB
will call db_errcall_fcn with additional error information. The
function must be declared with two arguments; the first will be the prefix
string (as previously set by DB->set_errpfx or
DBENV->set_errpfx), the second will be the error message string.
It is up to the db_errcall_fcn function to display the error
message in an appropriate manner.
Alternatively, you can use the DB->set_errfile or
DBENV->set_errfile functions to display the additional information
via a C library FILE *.
This error logging enhancement does not slow performance or significantly
increase application size, and may be run during normal operation as well
as during application debugging.
The DBENV->set_errcall interface may be used to configure Berkeley DB at any time
during the life of the application.