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<title>Safer Mode (The GNU Troff Manual)</title>

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<h4 class="subsection" id="Safer-Mode-1">5.38.1 Safer Mode</h4>
<a class="index-entry-id" id="index-safer-mode-7"></a>
<a class="index-entry-id" id="index-mode_002c-safer-7"></a>

<a class="index-entry-id" id="index-pi-request_002c-disabled-by-default"></a>
<a class="index-entry-id" id="index-sy-request_002c-disabled-by-default"></a>
<p>The formatter operates in &ldquo;safer&rdquo; mode by default; to mitigate risks
from untrusted input documents, the <code class="code">pi</code> and <code class="code">sy</code> requests are
disabled.  GNU <code class="code">troff</code>&rsquo;s <samp class="option">-U</samp> option enables &ldquo;unsafe
mode&rdquo;, restoring their function and enabling additional <code class="code">groff</code>
extension requests, <code class="code">open</code>, <code class="code">opena</code>, and <code class="code">pso</code>.
See <a class="xref" href="I_002fO.html">I/O</a>.
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