<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <meta http-equiv="Content-Style-Type" content="text/css"> <link rel="up" title="FatFs" href="../00index_e.html"> <link rel="alternate" hreflang="ja" title="Japanese" href="../ja/sync.html"> <link rel="stylesheet" href="../css_e.css" type="text/css" media="screen" title="ELM Default"> <title>FatFs - f_sync</title> </head> <body> <div class="para func"> <h2>f_sync</h2> <p>The f_sync function flushes the cached information of a writing file.</p> <pre> FRESULT f_sync ( FIL* <span class="arg">fp</span> <span class="c">/* [IN] File object */</span> ); </pre> </div> <div class="para arg"> <h4>Parameter</h4> <dl class="par"> <dt>fp</dt> <dd>Pointer to the open file object to be flushed.</dd> </dl> </div> <div class="para ret"> <h4>Return Values</h4> <p> <a href="rc.html#ok">FR_OK</a>, <a href="rc.html#de">FR_DISK_ERR</a>, <a href="rc.html#ie">FR_INT_ERR</a>, <a href="rc.html#io">FR_INVALID_OBJECT</a>, <a href="rc.html#tm">FR_TIMEOUT</a> </p> </div> <div class="para desc"> <h4>Description</h4> <p>The <tt>f_sync</tt> function performs the same process as <tt>f_close</tt> function but the file is left opened and can continue read/write/seek operations to the file. This is suitable for the applications that open files for a long time in write mode, such as data logger. Performing <tt>f_sync</tt> function of periodic or immediataly after <tt>f_write</tt> function can minimize the risk of data loss due to a sudden blackout or an unintentional media removal. For more information, refer to <a href="appnote.html#critical">application note</a>.</p> <p>However there is no sense in <tt>f_sync</tt> function immediataly before <tt>f_close</tt> function because it performs <tt>f_sync</tt> function in it. In other words, the differnce between those functions is that the file object is invalidated or not.</p> </div> <div class="para comp"> <h4>QuickInfo</h4> <p>Available when <tt>_FS_READONLY == 0</tt>.</p> </div> <div class="para ref"> <h4>See Also</h4> <p><tt><a href="close.html">f_close</a></tt></p> </div> <p class="foot"><a href="../00index_e.html">Return</a></p> </body> </html>