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DB-&gt;set_feedback
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#include &lt;db.h&gt;

int
DB-&gt;set_feedback(DB *,
 void (*db_feedback_fcn)(DB *dbp, int opcode, int percent));
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Description: DB-&gt;set_feedback
Some operations performed by the Berkeley DB library can take non-trivial
amounts of time. The DB-&gt;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 with progress information.
It is up to the callback function to display this information in an
appropriate manner.
The DB-&gt;set_feedback method may be called at any time during the life of the
application.
The DB-&gt;set_feedback method
returns a non-zero error value on failure
and 0 on success.

Parameters 
 db_feedback_fcn<ul compact><li>The db_feedback_fcn parameter is the application-specified
feedback function called to report Berkeley DB operation progress. The
callback function must take three parameters:
 
db<ul compact><li>The db parameter is a reference to the enclosing database.</ul>
opcode<ul compact><li>The opcode parameter is an operation code. The opcode
parameter may take on any of the following values:
 
<a name="DB_UPGRADE">DB_UPGRADE</a><ul compact><li>The underlying database is being upgraded.</ul>
<a name="DB_VERIFY">DB_VERIFY</a><ul compact><li>The underlying database is being verified.</ul>
 </ul>
percent<ul compact><li>The percent parameter is the percent of the operation that has
been completed, specified as an integer value between 0 and 100.</ul>
 </ul>
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.
 
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 See Also
<a href="../../db4-devel-4.7.25/api_c/db_list.html">Databases and Related Methods</a>
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