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+<title>Low-Level Control Of Database Files</title>
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+<!-- keywords: {file control} sqlite3_file_control -->
+<div class=nosearch>
+<a href="../c3ref/intro.html"><h2>SQLite C Interface</h2></a>
+<h2>Low-Level Control Of Database Files</h2>
+</div>
+<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>A few opcodes for <a href="../c3ref/file_control.html">sqlite3_file_control()</a> are handled directly
+by the SQLite core and never invoke the
+sqlite3_io_methods.xFileControl method.
+The <a href="../c3ref/c_fcntl_begin_atomic_write.html#sqlitefcntlfilepointer">SQLITE_FCNTL_FILE_POINTER</a> 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
+<a href="../c3ref/c_fcntl_begin_atomic_write.html#sqlitefcntljournalpointer">SQLITE_FCNTL_JOURNAL_POINTER</a> works similarly except that it returns
+the <a href="../c3ref/file.html">sqlite3_file</a> object associated with the journal file instead of
+the main database.  The <a href="../c3ref/c_fcntl_begin_atomic_write.html#sqlitefcntlvfspointer">SQLITE_FCNTL_VFS_POINTER</a> opcode returns
+a pointer to the underlying <a href="../c3ref/vfs.html">sqlite3_vfs</a> object for the file.
+The <a href="../c3ref/c_fcntl_begin_atomic_write.html#sqlitefcntldataversion">SQLITE_FCNTL_DATA_VERSION</a> returns the data version counter
+from the pager.</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_begin_atomic_write.html">file control opcodes</a>
+</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>
+