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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta name="generator" content="HTML Tidy, see www.w3.org"><meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><link type="text/css" rel="stylesheet" href="style.css"><!-- Generated by The Open Group's rhtm tool v1.2.1 --><!-- Copyright (c) 2001-2004 IEEE and The Open Group, All Rights Reserved --><title>fdatasync</title></head><body bgcolor="white"><script type="text/javascript" language="JavaScript" src="../jscript/codes.js"></script><basefont size="3"> <a name="fdatasync"></a> <a name="tag_03_143"></a><!-- fdatasync --> <!--header start--><center><font size="2">The Open Group Base Specifications Issue 6<br>IEEE Std 1003.1, 2004 Edition<br>Copyright © 2001-2004 The IEEE and The Open Group, All Rights reserved.</font></center><!--header end--><hr size="2" noshade><h4><a name="tag_03_143_01"></a>NAME</h4><blockquote>fdatasync - synchronize the data of a file (<b>REALTIME</b>)</blockquote><h4><a name="tag_03_143_02"></a>SYNOPSIS</h4><blockquote class="synopsis"><div class="box"><code><tt><sup>[<a href="javascript:open_code('SIO')">SIO</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0"> #include <<a href="../basedefs/unistd.h.html">unistd.h</a>><br><br> int fdatasync(int</tt> <i>fildes</i><tt>); <img src="../images/opt-end.gif" alt="[Option End]" border="0"></tt></code></div><tt><br></tt></blockquote><h4><a name="tag_03_143_03"></a>DESCRIPTION</h4><blockquote><p>The <i>fdatasync</i>() function shall force all currently queued I/O operations associated with the file indicated by filedescriptor <i>fildes</i> to the synchronized I/O completion state.</p><p>The functionality shall be equivalent to <a href="../functions/fsync.html"><i>fsync</i>()</a> with the symbol_POSIX_SYNCHRONIZED_IO defined, with the exception that all I/O operations shall be completed as defined for synchronized I/O dataintegrity completion.</p></blockquote><h4><a name="tag_03_143_04"></a>RETURN VALUE</h4><blockquote><p>If successful, the <i>fdatasync</i>() function shall return the value 0; otherwise, the function shall return the value -1 andset <i>errno</i> to indicate the error. If the <i>fdatasync</i>() function fails, outstanding I/O operations are not guaranteed tohave been completed.</p></blockquote><h4><a name="tag_03_143_05"></a>ERRORS</h4><blockquote><p>The <i>fdatasync</i>() function shall fail if:</p><dl compact><dt>[EBADF]</dt><dd>The <i>fildes</i> argument is not a valid file descriptor open for writing.</dd><dt>[EINVAL]</dt><dd>This implementation does not support synchronized I/O for this file.</dd></dl><p>In the event that any of the queued I/O operations fail, <i>fdatasync</i>() shall return the error conditions defined for <ahref="../functions/read.html"><i>read</i>()</a> and <a href="../functions/write.html"><i>write</i>()</a>.</p></blockquote><hr><div class="box"><em>The following sections are informative.</em></div><h4><a name="tag_03_143_06"></a>EXAMPLES</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_143_07"></a>APPLICATION USAGE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_143_08"></a>RATIONALE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_143_09"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_143_10"></a>SEE ALSO</h4><blockquote><p><a href="aio_fsync.html"><i>aio_fsync</i>()</a>, <a href="fcntl.html"><i>fcntl</i>()</a>, <a href="fsync.html"><i>fsync</i>()</a>, <a href="open.html"><i>open</i>()</a>, <a href="read.html"><i>read</i>()</a>, <a href="write.html"><i>write</i>()</a>, the Base Definitions volume of IEEE Std 1003.1-2001, <a href="../basedefs/unistd.h.html"><i><unistd.h></i></a></p></blockquote><h4><a name="tag_03_143_11"></a>CHANGE HISTORY</h4><blockquote><p>First released in Issue 5. Included for alignment with the POSIX Realtime Extension.</p></blockquote><h4><a name="tag_03_143_12"></a>Issue 6</h4><blockquote><p>The [ENOSYS] error condition has been removed as stubs need not be provided if an implementation does not support theSynchronized Input and Output option.</p><p>The <i>fdatasync</i>() function is marked as part of the Synchronized Input and Output option.</p></blockquote><div class="box"><em>End of informative text.</em></div><hr size="2" noshade><center><font size="2"><!--footer start-->UNIX ® is a registered Trademark of The Open Group.<br>POSIX ® is a registered Trademark of The IEEE.<br>[ <a href="../mindex.html">Main Index</a> | <a href="../basedefs/contents.html">XBD</a> | <a href="../utilities/contents.html">XCU</a> | <a href="../functions/contents.html">XSH</a> | <a href="../xrat/contents.html">XRAT</a>]</font></center><!--footer end--><hr size="2" noshade></body></html>⌨️ 快捷键说明
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