# DB->set_feedback

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    #include <db.h>

    int
    DB->set_feedback(DB *,
        void (*db_feedback_fcn)(DB *dbp, int opcode, int pct));

# Description

Some operations performed by the Berkeley DB library can take non-trivial amounts of time. The DB->set_feedback method 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:

DB_UPGRADE
  The underlying database is being upgraded.

DB_VERIFY
  The underlying database is being verified.

The DB->set_feedback interface may be called at any time during the life of the application.

The DB->set_feedback method returns a non-zero error value on failure and 0 on success.

# Class

DB

# See Also

Databases and Related Methods`

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