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


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<table class="head">
  <tr>
    <td class="head-ltitle">VM_MAP_CHECK_PROTECTION(9)</td>
    <td class="head-vol">Kernel Developer's Manual</td>
    <td class="head-rtitle">VM_MAP_CHECK_PROTECTION(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">vm_map_check_protection</code> &#x2014;
    <span class="Nd">check memory protection for a vm_map</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/param.h</a>&gt;</code>
  <br/>
  <code class="In">#include &lt;<a class="In">vm/vm.h</a>&gt;</code>
  <br/>
  <code class="In">#include &lt;<a class="In">vm/vm_map.h</a>&gt;</code></p>
<p class="Pp"><var class="Ft">boolean_t</var>
  <br/>
  <code class="Fn">vm_map_check_protection</code>(<var class="Fa">vm_map_t
    map</var>, <var class="Fa">vm_offset_t start</var>,
    <var class="Fa">vm_offset_t end</var>, <var class="Fa">vm_prot_t
    protection</var>);</p>
</section>
<section class="Sh">
<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
<p class="Pp">The
    <a class="permalink" href="#vm_map_check_protection"><code class="Fn" id="vm_map_check_protection">vm_map_check_protection</code></a>()
    function asserts that the target <var class="Fa">map</var> allows the
    specified privilege <var class="Fa">protection</var> over the entire address
    range from <var class="Fa">start</var> to <var class="Fa">end</var>. The
    region MUST be contiguous; no holes are allowed.</p>
</section>
<section class="Sh">
<h1 class="Sh" id="IMPLEMENTATION_NOTES"><a class="permalink" href="#IMPLEMENTATION_NOTES">IMPLEMENTATION
  NOTES</a></h1>
<p class="Pp">This code does not and SHOULD not check whether the contents of
    the region are accessible. For example, a small file may be mapped into an
    address space which is significantly larger in size.</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">vm_map_check_protection</code>() function
    returns TRUE if the privilege is allowed; if it is not allowed, or if any
    other error occurred, the value FALSE is returned.</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">munmap(2)</a>, <a class="Xr">vm_map(9)</a>,
    <a class="Xr">vm_map_protect(9)</a></p>
</section>
<section class="Sh">
<h1 class="Sh" id="AUTHORS"><a class="permalink" href="#AUTHORS">AUTHORS</a></h1>
<p class="Pp">This manual page was written by <span class="An">Bruce M
    Simpson</span>
    &lt;<a class="Mt" href="mailto:bms@spc.org">bms@spc.org</a>&gt;.</p>
</section>
</div>
<table class="foot">
  <tr>
    <td class="foot-date">July 19, 2003</td>
    <td class="foot-os">FreeBSD 15.0</td>
  </tr>
</table>