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+<a href="intro.html"><h2>SQLite C Interface</h2></a>
+<h2>Write-Ahead Log Commit Hook</h2>
+</div>
+<blockquote><pre>
+void *sqlite3_wal_hook(
+  sqlite3*,
+  int(*)(void *,sqlite3*,const char*,int),
+  void*
+);
+</pre></blockquote>
+<p>
+The <a href="../c3ref/wal_hook.html">sqlite3_wal_hook()</a> function is used to register a callback that
+is invoked each time data is committed to a database in wal mode.</p>
+
+<p>The callback is invoked by SQLite after the commit has taken place and
+the associated write-lock on the database released, so the implementation
+may read, write or <a href="../wal.html#ckpt">checkpoint</a> the database as required.</p>
+
+<p>The first parameter passed to the callback function when it is invoked
+is a copy of the third parameter passed to sqlite3_wal_hook() when
+registering the callback. The second is a copy of the database handle.
+The third parameter is the name of the database that was written to -
+either "main" or the name of an <a href="../lang_attach.html">ATTACH</a>-ed database. The fourth parameter
+is the number of pages currently in the write-ahead log file,
+including those that were just committed.</p>
+
+<p>The callback function should normally return <a href="../rescode.html#ok">SQLITE_OK</a>.  If an error
+code is returned, that error will propagate back up through the
+SQLite code base to cause the statement that provoked the callback
+to report an error, though the commit will have still occurred. If the
+callback returns <a href="../rescode.html#row">SQLITE_ROW</a> or <a href="../rescode.html#done">SQLITE_DONE</a>, or if it returns a value
+that does not correspond to any valid SQLite error code, the results
+are undefined.</p>
+
+<p>A single database handle may have at most a single write-ahead log callback
+registered at one time. Calling <a href="../c3ref/wal_hook.html">sqlite3_wal_hook()</a> replaces any
+previously registered write-ahead log callback. The return value is
+a copy of the third parameter from the previous call, if any, or 0.
+Note that the <a href="../c3ref/wal_autocheckpoint.html">sqlite3_wal_autocheckpoint()</a> interface and the
+<a href="../pragma.html#pragma_wal_autocheckpoint">wal_autocheckpoint pragma</a> both invoke <a href="../c3ref/wal_hook.html">sqlite3_wal_hook()</a> and will
+overwrite any prior <a href="../c3ref/wal_hook.html">sqlite3_wal_hook()</a> settings.
+</p><p>See also lists of
+  <a href="objlist.html">Objects</a>,
+  <a href="constlist.html">Constants</a>, and
+  <a href="funclist.html">Functions</a>.</p>
+