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


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56

<table class="head">
  <tr>
    <td class="head-ltitle">DEVICE_FIND_CHILD(9)</td>
    <td class="head-vol">Kernel Developer's Manual</td>
    <td class="head-rtitle">DEVICE_FIND_CHILD(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">device_find_child</code> &#x2014;
    <span class="Nd">search for a child of a device</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/bus.h</a>&gt;</code></p>
<p class="Pp"><var class="Ft">device_t</var>
  <br/>
  <code class="Fn">device_find_child</code>(<var class="Fa" style="white-space: nowrap;">device_t
    dev</var>, <var class="Fa" style="white-space: nowrap;">const char
    *classname</var>, <var class="Fa" style="white-space: nowrap;">int
    unit</var>);</p>
</section>
<section class="Sh">
<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
<p class="Pp">This function looks for a specific child of
    <code class="Dv">dev</code> with the given <var class="Fa">classname</var>
    and <var class="Fa">unit</var>. If <var class="Fa">unit</var> is -1, it
    returns the first child of <var class="Fa">dev</var> with a matching
    <var class="Fa">classname</var> (that is, the one with the lowest unit).</p>
</section>
<section class="Sh">
<h1 class="Sh" id="RETURN_VALUES"><a class="permalink" href="#RETURN_VALUES">RETURN
  VALUES</a></h1>
<p class="Pp">If it exists, the child device is returned, otherwise NULL.</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">device_add_child(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">Doug
    Rabson</span>.</p>
</section>
</div>
<table class="foot">
  <tr>
    <td class="foot-date">February 8, 2005</td>
    <td class="foot-os">FreeBSD 15.0</td>
  </tr>
</table>