106 lines
3.5 KiB
HTML
106 lines
3.5 KiB
HTML
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<html>
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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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<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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<br>
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Default Public Authority: *USE<br>
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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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