int DB->set_feedback(DB *, void (*db_feedback_fcn)(DB *dbp, int opcode, int pct));
Some operations performed by the Berkeley DB library can take non-trivial amounts of time. The DB->set_feedback function can be used by applications to monitor progress within these operations.
When an operation is likely to take a long time, Berkeley DB will call the specified callback function. This function must be declared with three arguments: the first will be a reference to the enclosing database handle; the second a flag value; and the third the percent of the operation that has been completed, specified as an integer value between 0 and 100. It is up to the callback function to display this information in an appropriate manner.
The opcode argument may take on any of the following values:
The DB->set_feedback interface may be used to configure Berkeley DB at any time during the life of the application.
The DB->set_feedback function returns a non-zero error value on failure and 0 on success.
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