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+<!-- keywords: sqlite3_log -->
+<div class=nosearch>
+<a href="../c3ref/intro.html"><h2>SQLite C Interface</h2></a>
+<h2>Error Logging Interface</h2>
+</div>
+<blockquote><pre>
+void sqlite3_log(int iErrCode, const char *zFormat, ...);
+</pre></blockquote>
+<p>
+The <a href="../c3ref/log.html">sqlite3_log()</a> interface writes a message into the <a href="../errlog.html">error log</a>
+established by the <a href="../c3ref/c_config_covering_index_scan.html#sqliteconfiglog">SQLITE_CONFIG_LOG</a> option to <a href="../c3ref/config.html">sqlite3_config()</a>.
+If logging is enabled, the zFormat string and subsequent arguments are
+used with <a href="../c3ref/mprintf.html">sqlite3_snprintf()</a> to generate the final output string.</p>
+
+<p>The sqlite3_log() interface is intended for use by extensions such as
+virtual tables, collating functions, and SQL functions. While there is
+nothing to prevent an application from calling sqlite3_log(), doing so
+is considered bad form.</p>
+
+<p>The zFormat string must not be NULL.</p>
+
+<p>To avoid deadlocks and other threading problems, the sqlite3_log() routine
+will not use dynamically allocated memory. The log message is stored in
+a fixed-length buffer on the stack. If the log message is longer than
+a few hundred characters, it will be truncated to the length of the
+buffer.
+</p><p>See also lists of
+ <a href="../c3ref/objlist.html">Objects</a>,
+ <a href="../c3ref/constlist.html">Constants</a>, and
+ <a href="../c3ref/funclist.html">Functions</a>.</p>
+