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authorJacob McDonnell <jacob@jacobmcdonnell.com>2026-04-25 19:55:43 -0400
committerJacob McDonnell <jacob@jacobmcdonnell.com>2026-04-25 19:55:43 -0400
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docs: Added All FreeBSD Manuals
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+<table class="head">
+ <tr>
+ <td class="head-ltitle">PRISON_CHECK(9)</td>
+ <td class="head-vol">Kernel Developer's Manual</td>
+ <td class="head-rtitle">PRISON_CHECK(9)</td>
+ </tr>
+</table>
+<div class="manual-text">
+<section class="Sh">
+<h1 class="Sh" id="NAME"><a class="permalink" href="#NAME">NAME</a></h1>
+<p class="Pp"><code class="Nm">prison_check</code> &#x2014;
+ <span class="Nd">determine if subjects may see entities according to jail
+ restrictions</span></p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
+<p class="Pp"><code class="In">#include
+ &lt;<a class="In">sys/jail.h</a>&gt;</code></p>
+<p class="Pp"><var class="Ft">int</var>
+ <br/>
+ <code class="Fn">prison_check</code>(<var class="Fa" style="white-space: nowrap;">struct
+ ucred *cred1</var>, <var class="Fa" style="white-space: nowrap;">struct
+ ucred *cred2</var>);</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
+<p class="Pp">This function determines if a subject with credentials
+ <var class="Fa">cred1</var> is denied access to subjects or objects with
+ credentials <var class="Fa">cred2</var> according to the policy that a
+ subject can see subjects or objects in its own jail or any sub-jail of
+ it.</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="RETURN_VALUES"><a class="permalink" href="#RETURN_VALUES">RETURN
+ VALUES</a></h1>
+<p class="Pp">The <code class="Fn">prison_check</code>() function returns
+ <code class="Er">ESRCH</code> if <var class="Fa">cred2</var> is not in the
+ same jail or a sub-jail of that of <var class="Fa">cred1</var>. In all other
+ cases, <code class="Fn">prison_check</code>() returns zero.</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="SEE_ALSO"><a class="permalink" href="#SEE_ALSO">SEE
+ ALSO</a></h1>
+<p class="Pp"><a class="Xr">jail(2)</a></p>
+</section>
+</div>
+<table class="foot">
+ <tr>
+ <td class="foot-date">August 18, 2023</td>
+ <td class="foot-os">FreeBSD 15.0</td>
+ </tr>
+</table>