106 lines
3.5 KiB
HTML
106 lines
3.5 KiB
HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<meta name="Copyright" content="Copyright (c) 2006 by IBM Corporation">
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<title>fclear64()--Write (Binary Zeros) to Descriptor (Large File Enabled)</title>
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<!-- Begin Header Records -->
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<!-- file cleaned -->
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<!-- Unix2 SCRIPT J converted by B2H R4.1 (346) (CMS) by V2KEA304 -->
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<!-- at RCHVMW2 on 17 Feb 1999 at 11:05:09 -->
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<!-- Change History: -->
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<!-- 020410 RTHEIS Created V5R3, DCR 99096 -->
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<link rel="stylesheet" type="text/css" href="../rzahg/ic.css">
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</head>
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<body>
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<!-- End Header Records --><!-- Edited by Kersten Feb 02 -->
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<!-- Java sync-link -->
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<script type="text/javascript" language="Javascript" src="../rzahg/synch.js">
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</script>
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<a name="Top_Of_Page"></a>
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<h2>fclear64()---Write (Binary Zeros) to Descriptor (Large File Enabled)</h2>
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<div class="box" style="width: 60%;">
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<br>
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Syntax<br>
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<pre>
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#include <unistd.h>
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off64_t fclear
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(int <em>file_descriptor</em>, off64_t <em>nbyte</em>);
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</pre>
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<br>
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Service Program Name: QP0LLIB1<br>
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<!-- iddvc RMBR -->
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<br>
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Default Public Authority: *USE<br>
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<!-- iddvc RMBR -->
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<br>
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Threadsafe: Conditional; see <a href="#USAGE_NOTES">Usage
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Notes</a>.<br>
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<br>
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</div>
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<p>The <strong>fclear64()</strong> function writes <em>nbyte</em> bytes
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of binary zeros to the file associated with the <em>file_descriptor</em>.
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If <em>nbyte</em> is zero,
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<strong>fclear64()</strong> simply returns a value of zero without attempting any
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other action.</p>
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<p><strong>fclear64()</strong> is enabled for large files. It is capable of operating
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on files larger than 2GB minus 1 bytes and is capable of clearing up to the system
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allowed maximum file size bytes as long as the file exists in Root, QOpenSys,
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and UDFS file systems and has been opened by either of the following:</p>
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<ul>
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<li>Using the <strong>open64()</strong> function (see
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<a href="open64.htm">open64()--Open File (Large File Enabled)</a>).
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</li>
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<li>Using the <strong>open()</strong> function (see
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<a href="open.htm">open()--Open File</a>) with the O_LARGEFILE flag
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set in the oflag parameter.
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</li>
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</ul>
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<p>For additional information about parameters, authorities, error conditions,
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and examples, see <a href="fclear.htm">fclear()--Write (Binary Zeros) to Descriptor</a>.</p>
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<h3>Usage Notes</h3>
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<ol type="1">
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<li>When you develop in C-based languages, the prototypes for the 64-bit APIs
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are normally hidden. To use the <b>fclear64()</b> API, you must compile
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the source with the _LARGE_FILE_API macro defined.</li>
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<li>All of the usage notes for <b>fclear()</b> apply to <b>
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fclear64()</b>. See <em>Usage Notes</em> in the <b>fclear()</b>
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API.</li>
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</ol>
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<br>
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<hr>
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<p>API introduced: V5R3</p>
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<hr>
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<table align="center" cellpadding="2" cellspacing="2">
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<tr align="center">
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<td valign="middle" align="center"><a href="#Top_Of_Page">Top</a> | <a href=
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"unix.htm">UNIX-Type APIs</a> | <a href="aplist.htm">APIs by category</a></td>
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</tr>
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</table>
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</body>
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</html>
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