This is xnu-10002.1.13. See this file in:
<h2>host_reboot</h2>
<hr>
<p>
<strong>Function</strong> - Reboot this host.
<h3>SYNOPSIS</h3>
<pre>
<strong>kern_return_t   host_reboot</strong>
                <strong>(host_priv_t</strong>                          <var>host_priv</var>,
                 <strong>int</strong>                                    <var>options</var><strong>);</strong>
</pre>
<h3>PARAMETERS</h3>
<dl>
<p>
<dt> <var>host_priv</var> 
<dd>
[in host-control send right]
The control port the host to be re-booted.
<p>
<dt> <var>options</var> 
<dd>
[in scalar]
Reboot options.  See \*L<mach/host_reboot.h>\*O for details.
</dl>
<h3>DESCRIPTION</h3>
<p>
The <strong>host_reboot</strong> function reboots the specified host.
<h3>NOTES</h3>
<p>
If successful, this call will not return.
<h3>RETURN VALUES</h3>
<p>
Only generic errors apply.
<h3>RELATED INFORMATION</h3>
<p>
None.