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Berkeley DB: DB_ENV->set_msgcall
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DB_ENV->set_msgcall
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#include <db.h>
void
DB_ENV->set_msgcall(DB_ENV *dbenv,
void (*db_msgcall_fcn)(const DB_ENV *dbenv, const char *msg));
Description: DB_ENV->set_msgcall
There are interfaces in the Berkeley DB library which either directly output
informational messages or statistical information, or configure the
library to output such messages when performing other operations, for
example, DB_ENV->set_verbose and DB_ENV->stat_print.
The DB_ENV->set_msgcall and DB->set_msgcall methods are used to
pass these messages to the application, and Berkeley DB will call
db_msgcall_fcn with each message. It is up to the
db_msgcall_fcn function to display the message in an appropriate
manner.
Setting db_msgcall_fcn to NULL unconfigures the callback interface.
Alternatively, you can use the DB->set_msgfile or
DB_ENV->set_msgfile methods to display the messages via a C library FILE *.
The DB_ENV->set_msgcall method configures operations performed using the specified
DB_ENV handle, not all operations performed on the underlying
database environment.
The DB_ENV->set_msgcall method may be called at any time during the life of the
application.
Parameters
db_msgcall_fcn- The db_msgcall_fcn parameter is the application-specified message
reporting function. The function takes two parameters:
dbenv- The dbenv parameter is the enclosing database environment.
msg- The msg parameter is the message string.
Berkeley DB is not re-entrant. Callback functions should not attempt to make
library calls (for example, to release locks or close open handles).
Re-entering Berkeley DB is not guaranteed to work correctly, and the results
are undefined.
Class
DB_ENV
See Also
Database Environments and Related Methods
Copyright (c) 1996,2008 Oracle. All rights reserved.