static/freebsd/man9/prison_check.9 4.html


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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>