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<h1>DBENV-&gt;set_tx_recover</h1>
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<h3><pre>
#include &lt;db.h&gt;
<p>
int
DBENV-&gt;set_tx_recover(DB_ENV *dbenv,
    int (*tx_recover)(DB_ENV *dbenv,
    DBT *log_rec, DB_LSN *lsn, db_recops op));
</pre></h3>
<h1>Description</h1>
<p>Set the application's function to be called during transaction abort
and recovery.  This function must return 0 on success and either
<b>errno</b> or a value outside of the Berkeley DB error name space on
failure.  It takes four arguments:
<p><dl compact>
<p><dt>dbenv  <dd>A Berkeley DB environment.
<p><dt>log_rec<dd>A log record.
<p><dt>lsn<dd>A log sequence number.
<p><dt>op<dd>One of the following values:
<p><dl compact>
<p><dt><a name="DB_TXN_BACKWARD_ROLL">DB_TXN_BACKWARD_ROLL</a><dd>The log is being read backward to determine which transactions have been
committed and to abort those operations that were not, undo the operation
described by the log record.
<p><dt><a name="DB_TXN_FORWARD_ROLL">DB_TXN_FORWARD_ROLL</a><dd>The log is being played forward, redo the operation described by the log
record.
<p><dt><a name="DB_TXN_ABORT">DB_TXN_ABORT</a><dd>The log is being read backwards during a transaction abort, undo the
operation described by the log record.
</dl>
</dl>
<p>The DBENV-&gt;set_tx_recover interface may only be used to configure Berkeley DB before
the <a href="../api_c/env_open.html">DBENV-&gt;open</a> interface is called.
<p>The DBENV-&gt;set_tx_recover function returns a non-zero error value on failure and 0 on success.
<h1>Errors</h1>
<p><dl compact>
<p><dt>EINVAL<dd>An invalid flag value or parameter was specified.
<p>Called after <a href="../api_c/env_open.html">DBENV-&gt;open</a> was called.
</dl>
<h1>See Also</h1>
<a href="../api_c/env_set_tx_max.html">DBENV-&gt;set_tx_max</a>,
<a href="../api_c/env_set_tx_recover.html">DBENV-&gt;set_tx_recover</a>,
<a href="../api_c/env_set_tx_timestamp.html">DBENV-&gt;set_tx_timestamp</a>,
<a href="../api_c/txn_abort.html">txn_abort</a>,
<a href="../api_c/txn_begin.html">txn_begin</a>,
<a href="../api_c/txn_checkpoint.html">txn_checkpoint</a>,
<a href="../api_c/txn_commit.html">txn_commit</a>,
<a href="../api_c/txn_id.html">txn_id</a>,
<a href="../api_c/txn_prepare.html">txn_prepare</a>
and
<a href="../api_c/txn_stat.html">txn_stat</a>.
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