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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><html><head><!-- Copyright 1997 The Open Group, All Rights Reserved --><title>fdatasync</title></head><body bgcolor=white><center><font size=2>The Single UNIX ® Specification, Version 2<br>Copyright © 1997 The Open Group</font></center><hr size=2 noshade><h4><a name = "tag_000_004_164"> </a>NAME</h4><blockquote>fdatasync - synchronise the data of a file(<b>REALTIME</b>)</blockquote><h4><a name = "tag_000_004_165"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="unistd.h.html">unistd.h</a>>int fdatasync(int <i>fildes</i>);</code></pre></blockquote><h4><a name = "tag_000_004_166"> </a>DESCRIPTION</h4><blockquote>The<i>fdatasync()</i>function forces all currently queued I/O operations associated with the fileindicated by file descriptor<i>fildes</i>to the synchronised I/O completion state.<p>The functionality is as described for<i><a href="fsync.html">fsync()</a></i>(with the symbol _XOPEN_REALTIME defined),with the exception thatall I/O operations are completed as defined forsynchronised I/O data integrity completion.</blockquote><h4><a name = "tag_000_004_167"> </a>RETURN VALUE</h4><blockquote>If successful, the<i>fdatasync()</i>function returns the value 0.Otherwise, the function returns the value -1 and sets<i>errno</i>to indicate the error.If the<i>fdatasync()</i>function fails,outstanding I/O operations are not guaranteed to have been completed.</blockquote><h4><a name = "tag_000_004_168"> </a>ERRORS</h4><blockquote>The <i>fdatasync()</i>function will fail if:<dl compact><dt>[EBADF]<dd>The<i>fildes</i>argument is not a valid file descriptor open for writing.<dt>[EINVAL]<dd>This implementation does not support synchronised I/O for this file.<dt>[ENOSYS]<dd>The function<i>fdatasync()</i>is not supported by this implementation.</dl><p>In the event that any of the queued I/O operations fail,<i>fdatasync()</i>returns the error conditions defined for<i><a href="read.html">read()</a></i>and<i><a href="write.html">write()</a></i>.</blockquote><h4><a name = "tag_000_004_169"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_004_170"> </a>APPLICATION USAGE</h4><blockquote>None.</blockquote><h4><a name = "tag_000_004_171"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_004_172"> </a>SEE ALSO</h4><blockquote><i><a href="aio_fsync.html">aio_fsync()</a></i>,<i><a href="fcntl.html">fcntl()</a></i>,<i><a href="fsync.html">fsync()</a></i>,<i><a href="open.html">open()</a></i>,<i><a href="read.html">read()</a></i>,<i><a href="write.html">write()</a></i>.</blockquote><h4>DERIVATION</h4><blockquote>Derived from the POSIX Realtime Extension (1003.1b-1993/1003.1i-1995)</blockquote><hr size=2 noshade><center><font size=2>UNIX ® is a registered Trademark of The Open Group.<br>Copyright © 1997 The Open Group<br> [ <a href="../index.html">Main Index</a> | <a href="../xshix.html">XSH</a> | <a href="../xcuix.html">XCU</a> | <a href="../xbdix.html">XBD</a> | <a href="../cursesix.html">XCURSES</a> | <a href="../xnsix.html">XNS</a> ]</font></center><hr size=2 noshade></body></html>⌨️ 快捷键说明
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