<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title>Truncates file descriptor fd to offset bytes</title>
</head>
<body><div class="manualnavbar" style="text-align: center;">
<div class="prev" style="text-align: left; float: left;"><a href="function.dio-tcsetattr.html">dio_tcsetattr</a></div>
<div class="next" style="text-align: right; float: right;"><a href="function.dio-write.html">dio_write</a></div>
<div class="up"><a href="ref.dio.html">Direct IO Functions</a></div>
<div class="home"><a href="index.html">PHP Manual</a></div>
</div><hr /><div id="function.dio-truncate" class="refentry">
<div class="refnamediv">
<h1 class="refname">dio_truncate</h1>
<p class="verinfo">(PHP 4 >= 4.2.0, PHP 5 <= 5.0.5)</p><p class="refpurpose"><span class="refname">dio_truncate</span> — <span class="dc-title">
Truncates file descriptor fd to offset bytes
</span></p>
</div>
<div class="refsect1 description" id="refsect1-function.dio-truncate-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">bool</span> <span class="methodname"><strong>dio_truncate</strong></span>
( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$fd</code></span>
, <span class="methodparam"><span class="type">int</span> <code class="parameter">$offset</code></span>
)</div>
<p class="para rdfs-comment">
<span class="function"><strong>dio_truncate()</strong></span> truncates a file to at most
<em><code class="parameter">offset</code></em> bytes in size.
</p>
<p class="para">
If the file previously was larger than this size, the extra data is
lost. If the file previously was shorter, it is unspecified whether the
file is left unchanged or is extended. In the latter case the extended
part reads as zero bytes.
</p>
</div>
<div class="refsect1 parameters" id="refsect1-function.dio-truncate-parameters">
<h3 class="title">Parameters</h3>
<p class="para">
<dl>
<dt>
<span class="term"><em><code class="parameter">fd</code></em></span>
<dd>
<p class="para">
The file descriptor returned by <span class="function"><a href="function.dio-open.html" class="function">dio_open()</a></span>.
</p>
</dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">offset</code></em></span>
<dd>
<p class="para">
The offset in bytes.
</p>
</dd>
</dt>
</dl>
</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.dio-truncate-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
Returns <strong><code>TRUE</code></strong> on success or <strong><code>FALSE</code></strong> on failure.
</p>
</div>
<div class="refsect1 notes" id="refsect1-function.dio-truncate-notes">
<h3 class="title">Notes</h3>
<blockquote class="note"><p><strong class="note">Note</strong>: <span class="simpara">This function is not
implemented on Windows platforms.</span></p></blockquote>
</div>
</div><hr /><div class="manualnavbar" style="text-align: center;">
<div class="prev" style="text-align: left; float: left;"><a href="function.dio-tcsetattr.html">dio_tcsetattr</a></div>
<div class="next" style="text-align: right; float: right;"><a href="function.dio-write.html">dio_write</a></div>
<div class="up"><a href="ref.dio.html">Direct IO Functions</a></div>
<div class="home"><a href="index.html">PHP Manual</a></div>
</div></body></html>
