142 lines
4.8 KiB
HTML
142 lines
4.8 KiB
HTML
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<!-- Copyright (c) 2001 The Open Group, All Rights Reserved -->
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<title>fdatasync</title>
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<basefont size="3"> <a name="fdatasync"></a> <a name="tag_03_143"></a><!-- fdatasync -->
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<!--header start-->
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<center><font size="2">The Open Group Base Specifications Issue 6<br>
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IEEE Std 1003.1-2001<br>
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Copyright © 2001 The IEEE and The Open Group, All Rights reserved.</font></center>
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<!--header end-->
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<hr size="2" noshade>
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<h4><a name="tag_03_143_01"></a>NAME</h4>
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<blockquote>fdatasync - synchronize the data of a file (<b>REALTIME</b>)</blockquote>
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<h4><a name="tag_03_143_02"></a>SYNOPSIS</h4>
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<blockquote class="synopsis">
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<div class="box"><code><tt><sup>[<a href="javascript:open_code('SIO')">SIO</a>]</sup> <img src="../images/opt-start.gif" alt=
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"[Option Start]" border="0"> #include <<a href="../basedefs/unistd.h.html">unistd.h</a>><br>
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<br>
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int fdatasync(int</tt> <i>fildes</i><tt>); <img src="../images/opt-end.gif" alt="[Option End]" border="0"></tt></code></div>
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<tt><br>
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</tt></blockquote>
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<h4><a name="tag_03_143_03"></a>DESCRIPTION</h4>
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<blockquote>
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<p>The <i>fdatasync</i>() function shall force all currently queued I/O operations associated with the file indicated by file
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descriptor <i>fildes</i> to the synchronized I/O completion state.</p>
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<p>The functionality shall be equivalent to <a href="../functions/fsync.html"><i>fsync</i>()</a> with the symbol
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_POSIX_SYNCHRONIZED_IO defined, with the exception that all I/O operations shall be completed as defined for synchronized I/O data
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integrity completion.</p>
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</blockquote>
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<h4><a name="tag_03_143_04"></a>RETURN VALUE</h4>
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<blockquote>
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<p>If successful, the <i>fdatasync</i>() function shall return the value 0; otherwise, the function shall return the value -1 and
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set <i>errno</i> to indicate the error. If the <i>fdatasync</i>() function fails, outstanding I/O operations are not guaranteed to
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have been completed.</p>
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</blockquote>
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<h4><a name="tag_03_143_05"></a>ERRORS</h4>
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<blockquote>
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<p>The <i>fdatasync</i>() function shall fail if:</p>
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<dl compact>
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<dt>[EBADF]</dt>
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<dd>The <i>fildes</i> argument is not a valid file descriptor open for writing.</dd>
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<dt>[EINVAL]</dt>
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<dd>This implementation does not support synchronized I/O for this file.</dd>
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</dl>
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<p>In the event that any of the queued I/O operations fail, <i>fdatasync</i>() shall return the error conditions defined for <a
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href="../functions/read.html"><i>read</i>()</a> and <a href="../functions/write.html"><i>write</i>()</a>.</p>
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</blockquote>
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<hr>
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<div class="box"><em>The following sections are informative.</em></div>
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<h4><a name="tag_03_143_06"></a>EXAMPLES</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_143_07"></a>APPLICATION USAGE</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_143_08"></a>RATIONALE</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_143_09"></a>FUTURE DIRECTIONS</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_143_10"></a>SEE ALSO</h4>
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<blockquote>
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<p><a href="aio_fsync.html"><i>aio_fsync</i>()</a> , <a href="fcntl.html"><i>fcntl</i>()</a> , <a href=
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"fsync.html"><i>fsync</i>()</a> , <a href="open.html"><i>open</i>()</a> , <a href="read.html"><i>read</i>()</a> , <a href=
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"write.html"><i>write</i>()</a> , the Base Definitions volume of IEEE Std 1003.1-2001, <a href=
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"../basedefs/unistd.h.html"><i><unistd.h></i></a></p>
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</blockquote>
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<h4><a name="tag_03_143_11"></a>CHANGE HISTORY</h4>
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<blockquote>
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<p>First released in Issue 5. Included for alignment with the POSIX Realtime Extension.</p>
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</blockquote>
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<h4><a name="tag_03_143_12"></a>Issue 6</h4>
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<blockquote>
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<p>The [ENOSYS] error condition has been removed as stubs need not be provided if an implementation does not support the
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Synchronized Input and Output option.</p>
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<p>The <i>fdatasync</i>() function is marked as part of the Synchronized Input and Output option.</p>
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</blockquote>
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<div class="box"><em>End of informative text.</em></div>
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UNIX ® is a registered Trademark of The Open Group.<br>
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POSIX ® is a registered Trademark of The IEEE.<br>
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