void Db::set_errfile(FILE *errfile);
When an error occurs in the Berkeley DB library, an exception is thrown or an
error return value is returned by the method. In some cases,
however, the errno value may be insufficient to completely
describe the cause of the error, especially during initial application
The DbEnv::set_errcall and Db::set_errcall methods are used to
enhance the mechanism for reporting error messages to the application
by setting a C library FILE * to be used for displaying additional Berkeley DB
error messages. In some cases, when an error occurs, Berkeley DB will output
an additional error message to the specified file reference.
Alternatively, you can use the DbEnv::set_error_stream method to display
the additional information via an output stream, or the
DbEnv::set_errcall method to capture the additional error information in
a way that does not use either output streams or C library FILE *'s. You
should not mix these approaches.
The error message will consist of the prefix string and a colon
(":") (if a prefix string was previously specified using
Db::set_errpfx or DbEnv::set_errpfx), an error string, and
a trailing <newline> character.
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.
For Db handles opened inside of Berkeley DB environments, calling the
Db::set_errfile method affects the entire environment and is equivalent to calling
the DbEnv::set_errfile method.
The Db::set_errfile interface may be called at any time during the life of
Databases and Related Methods
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