96 lines
3.2 KiB
HTML
96 lines
3.2 KiB
HTML
<!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>open64()--Open File (Large File Enabled)</title>
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- Change History: -->
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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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<script language="Javascript" src="../rzahg/synch.js" type="text/javascript">
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</script>
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<a name="Top_Of_Page"></a>
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<h2>open64()--Open File (Large File Enabled)</h2>
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<div class="box" style="width: 70%;">
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<br>
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Syntax<br>
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<pre>
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#include <fcntl.h>
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int open64(const char <em>*path</em>, int <em>oflag</em>, . . .);
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</pre>
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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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<!-- iddvc RMBR -->
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<br>
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Threadsafe: Conditional; see Usage Notes for <a href="open.htm">open()</a>.<br>
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<!-- iddvc RMBR -->
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<br>
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</div>
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<p>The <strong>open64()</strong> function, similar to the <strong>
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open()</strong> function, opens a file and returns a number called a file
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descriptor. <strong>open64()</strong> differs from <strong>open()</strong> in
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that it automatically opens the file with the O_LARGEFILE flag set. For a
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further description of the open flags, see <a href="open.htm#HDROPNFLAG">Using
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the oflag Parameter</a> in the <strong>open()</strong> API.</p>
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<p>For a discussion of the parameters, authorities required, return values,
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related information, and examples for the <strong>open()</strong> and <strong>
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open64()</strong> APIs, see <a href="open.htm">open()--Open File</a>.</p>
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<p>See <a href="open64u.htm">QlgOpen64()--Open File (Large File Enabled)</a>
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for a description and an example of supplying the <em>path</em> in any
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CCSID.</p>
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<br>
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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 <strong>open64()</strong> API, you must compile
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the source with the _LARGE_FILE_API macro defined.<br>
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<br>
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</li>
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<li>All of the usage notes for <strong>open()</strong> apply to <strong>
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open64()</strong> and <strong>QlgOpen64()</strong>. See <a href=
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"open.htm#HDROPENUSG">Usage Notes</a> in the <strong>open()</strong> API.</li>
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</ol>
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<hr>
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API introduced: V4R4
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<hr>
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<center>
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<table 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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</center>
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</html>
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