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+<table class="head">
+  <tr>
+    <td class="head-ltitle">VACCESS(9)</td>
+    <td class="head-vol">Kernel Developer's Manual</td>
+    <td class="head-rtitle">VACCESS(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">vaccess</code> &#x2014; <span class="Nd">generate
+    an access control decision using vnode parameters</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">sys/vnode.h</a>&gt;</code></p>
+<p class="Pp"><var class="Ft">int</var>
+  <br/>
+  <code class="Fn">vaccess</code>(<var class="Fa">enum vtype type</var>,
+    <var class="Fa">mode_t file_mode</var>, <var class="Fa">uid_t
+    file_uid</var>, <var class="Fa">gid_t file_gid</var>,
+    <var class="Fa">accmode_t accmode</var>, <var class="Fa">struct ucred
+    *cred</var>);</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
+<p class="Pp">This call implements the logic for the
+    <span class="Ux">UNIX</span> discretionary file security model common to
+    many file systems in <span class="Ux">FreeBSD</span>. It accepts the vnodes
+    type <var class="Fa">type</var>, permissions via
+    <var class="Fa">file_mode</var>, owning UID <var class="Fa">file_uid</var>,
+    owning GID <var class="Fa">file_gid</var>, desired access mode
+    <var class="Fa">accmode</var> and requesting credential
+    <var class="Fa">cred</var>.</p>
+<p class="Pp" id="vaccess">This call is intended to support implementations of
+    <a class="Xr">VOP_ACCESS(9)</a>, which will use their own access methods to
+    retrieve the vnode properties, and then invoke
+    <a class="permalink" href="#vaccess"><code class="Fn">vaccess</code></a>()
+    in order to perform the actual check. Implementations of
+    <a class="Xr">VOP_ACCESS(9)</a> may choose to implement additional security
+    mechanisms whose results will be composed with the return value.</p>
+<p class="Pp" id="vaccess~2">The algorithm used by
+    <a class="permalink" href="#vaccess~2"><code class="Fn">vaccess</code></a>()
+    selects a component of the file permission bits based on comparing the
+    passed credential, file owner, and file group. If the credential's effective
+    UID matches the file owner, then the owner component of the permission bits
+    is selected. If the UID does not match, then the credential's effective GID,
+    followed by additional groups, are compared with the file group&#x2014;if
+    there is a match, then the group component of the permission bits is
+    selected. If neither the credential UID or GIDs match the passed file owner
+    and group, then the other component of the permission bits is selected.</p>
+<p class="Pp">Once appropriate protections are selected for the current
+    credential, the requested access mode, in combination with the vnode type,
+    will be compared with the discretionary rights available for the credential.
+    If the rights granted by discretionary protections are insufficient, then
+    super-user privilege, if available for the credential, will also be
+    considered.</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="RETURN_VALUES"><a class="permalink" href="#RETURN_VALUES">RETURN
+  VALUES</a></h1>
+<p class="Pp"><code class="Fn">vaccess</code>() will return 0 on success, or a
+    non-zero error value on failure.</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="ERRORS"><a class="permalink" href="#ERRORS">ERRORS</a></h1>
+<dl class="Bl-tag">
+  <dt id="EACCES">[<a class="permalink" href="#EACCES"><code class="Er">EACCES</code></a>]</dt>
+  <dd>Permission denied. An attempt was made to access a file in a way forbidden
+      by its file access permissions.</dd>
+  <dt id="EPERM">[<a class="permalink" href="#EPERM"><code class="Er">EPERM</code></a>]</dt>
+  <dd>Operation not permitted. An attempt was made to perform an operation
+      limited to processes with appropriate privileges or to the owner of a file
+      or other resource.</dd>
+</dl>
+</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">vaccess_acl_nfs4(9)</a>,
+    <a class="Xr">vaccess_acl_posix1e(9)</a>, <a class="Xr">vnode(9)</a>,
+    <a class="Xr">VOP_ACCESS(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 and the current implementation of
+    <code class="Fn">vaccess</code>() were written by <span class="An">Robert
+    Watson</span>.</p>
+</section>
+</div>
+<table class="foot">
+  <tr>
+    <td class="foot-date">August 23, 2022</td>
+    <td class="foot-os">FreeBSD 15.0</td>
+  </tr>
+</table>