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<a href="intro.html"><h2>SQLite C Interface</h2></a><h2>Low-Level Control Of Database Files</h2><blockquote><pre>int sqlite3_file_control(sqlite3*, const char *zDbName, int op, void*);
</pre></blockquote><p>
The <a href="../c3ref/file_control.html">sqlite3_file_control()</a> interface makes a direct call to the
xFileControl method for the <a href="../c3ref/io_methods.html">sqlite3_io_methods</a> object associated
with a particular database identified by the second argument. The
name of the database is "main" for the main database or "temp" for the
TEMP database, or the name that appears after the AS keyword for
databases that are added using the <a href="../lang_attach.html">ATTACH</a> SQL command.
A NULL pointer can be used in place of "main" to refer to the
main database file.
The third and fourth parameters to this routine
are passed directly through to the second and third parameters of
the xFileControl method. The return value of the xFileControl
method becomes the return value of this routine.</p>
<p>The SQLITE_FCNTL_FILE_POINTER value for the op parameter causes
a pointer to the underlying <a href="../c3ref/file.html">sqlite3_file</a> object to be written into
the space pointed to by the 4th parameter. The SQLITE_FCNTL_FILE_POINTER
case is a short-circuit path which does not actually invoke the
underlying sqlite3_io_methods.xFileControl method.</p>
<p>If the second parameter (zDbName) does not match the name of any
open database file, then SQLITE_ERROR is returned. This error
code is not remembered and will not be recalled by <a href="../c3ref/errcode.html">sqlite3_errcode()</a>
or <a href="../c3ref/errcode.html">sqlite3_errmsg()</a>. The underlying xFileControl method might
also return SQLITE_ERROR. There is no way to distinguish between
an incorrect zDbName and an SQLITE_ERROR return from the underlying
xFileControl method.</p>
<p>See also: <a href="../c3ref/c_fcntl_busyhandler.html">SQLITE_FCNTL_LOCKSTATE</a>
</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>
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