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<title>Create a fifo special file (a named pipe)</title>
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<h1 class="refname">posix_mkfifo</h1>
<p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">posix_mkfifo</span> — <span class="dc-title">Create a fifo special file (a named pipe)</span></p>
</div>
<div class="refsect1 description" id="refsect1-function.posix-mkfifo-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">bool</span> <span class="methodname"><strong>posix_mkfifo</strong></span>
( <span class="methodparam"><span class="type">string</span> <code class="parameter">$pathname</code></span>
, <span class="methodparam"><span class="type">int</span> <code class="parameter">$mode</code></span>
)</div>
<p class="para rdfs-comment">
<span class="function"><strong>posix_mkfifo()</strong></span> creates a special
<em>FIFO</em> file which exists in the file system and acts as
a bidirectional communication endpoint for processes.
</p>
</div>
<div class="refsect1 parameters" id="refsect1-function.posix-mkfifo-parameters">
<h3 class="title">Parameters</h3>
<p class="para">
<dl>
<dt>
<span class="term"><em><code class="parameter">pathname</code></em></span>
<dd>
<p class="para">
Path to the <em>FIFO</em> file.
</p>
</dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">mode</code></em></span>
<dd>
<p class="para">
The second parameter <em><code class="parameter">mode</code></em> has to be given in
octal notation (e.g. 0644). The permission of the newly created
<em>FIFO</em> also depends on the setting of the current
<span class="function"><a href="function.umask.html" class="function">umask()</a></span>. The permissions of the created file are
(mode & ~umask).
</p>
</dd>
</dt>
</dl>
</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.posix-mkfifo-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.posix-mkfifo-notes">
<h3 class="title">Notes</h3>
<blockquote class="note"><p><strong class="note">Note</strong>: <span class="simpara">When <a href="features.safe-mode.html" class="link">safe mode</a> is enabled, PHP checks whether
the files or directories being operated upon have the same UID (owner) as the
script that is being executed.</span></p></blockquote>
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