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Berkeley DB: DbEnv::set_errcall
DbEnv::set_errcall
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#include <db_cxx.h>
void DbEnv::set_errcall(void (*db_errcall_fcn)
(const Dbenv *dbenv, const char *errpfx, const char *msg));
Description: DbEnv::set_errcall
When an error occurs in the Berkeley DB library, an exception is thrown or an
error return value is returned by the interface. 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 and Db::set_errcall methods are 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. It is up to
the db_errcall_fcn function to display the error message in an
appropriate manner.
Setting db_errcall_fcn to NULL unconfigures the callback interface.
Alternatively, you can use the DbEnv::set_error_stream and
Db::set_error_stream methods to display the additional information via
an output stream, or the Db::set_errfile or
DbEnv::set_errfile methods to display the additional information via a C
library FILE *. You should not mix these approaches.
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 method may be called at any time during the life of the
application.
Parameters
- db_errcall_fcn
- The db_errcall_fcn parameter is the application-specified error
reporting function. The function takes three parameters:
- dbenv
- The dbenv parameter is the enclosing database environment.
- errpfx
- The errpfx parameter is the prefix string (as previously set by
Db::set_errpfx or DbEnv::set_errpfx).
- msg
- The msg parameter is the error message string.
Class
DbEnv
See Also
Database Environments and Related Methods
Copyright (c) 1996-2004 Sleepycat Software, Inc. - All rights reserved.
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