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<pre> <span class="headline">sys_un.h(0P)              POSIX Pro‐
grammer’s  Manual              sys_un.h(0P)</span>  </pre> <h2><a
id="PROLOG" href="#PROLOG"></a>PROLOG  &nbsp; &nbsp; &nbsp;  &nb‐
sp;        <a        href="#top_of_page"><span        class="top‐
link">top</span></a></h2><pre>
       This manual page is part of the POSIX Programmer’s Manual.
The Linux
       implementation of this interface may differ (consult the
       corresponding  Linux  manual page for details of Linux be‐
havior), or
       the interface may not be  implemented  on  Linux.   </pre>
<h2><a id="NAME" href="#NAME"></a>NAME  &nbsp; &nbsp; &nbsp; &nb‐
sp;        <a        href="#top_of_page"><span        class="top‐
link">top</span></a></h2><pre>
       sys/un.h  —  definitions  for  UNIX  domain sockets </pre>
<h2><a id="SYNOPSIS" href="#SYNOPSIS"></a>SYNOPSIS  &nbsp; &nbsp;
&nbsp;    &nbsp;    <a    href="#top_of_page"><span   class="top‐
link">top</span></a></h2><pre>
       #include &lt;sys/un.h&gt; </pre>  <h2><a  id="DESCRIPTION"
href="#DESCRIPTION"></a>DESCRIPTION   &nbsp; &nbsp; &nbsp; &nbsp;
<a             href="#top_of_page"><span              class="top‐
link">top</span></a></h2><pre>
       The   <i>&lt;sys/un.h&gt;</i>   header  shall  define  the
<b>sockaddr_un </b>structure, which
       shall include at least the following members:

           <b>sa_family_t  sun_family  </b>Address family.
           char         sun_path[]  Socket pathname.

       The <b>sockaddr_un </b>structure is used to store address‐
es for UNIX domain
       sockets.   Pointers to this type shall be cast by applica‐
tions to
       <b>struct sockaddr * </b>for use with socket functions.

       The  <i>&lt;sys/un.h&gt;</i>  header  shall   define   the
<b>sa_family_t </b>type as described
       in <i>&lt;sys/socket.h&gt;</i>.

       <i>The  following  sections  are  informative.</i>  </pre>
<h2><a  id="APPLICATION_USAGE"  href="#APPLICATION_USAGE"></a>AP‐
PLICATION    USAGE     &nbsp;    &nbsp;    &nbsp;    &nbsp;    <a
href="#top_of_page"><span                             class="top‐
link">top</span></a></h2><pre>
       The  size  of  <i>sun_path</i> has intentionally been left
undefined. This is
       because different implementations use different sizes. For
example,
       4.3  BSD  uses  a  size of 108, and 4.4 BSD uses a size of
104. Since
       most implementations originate from BSD versions, the size
is
       typically in the range 92 to 108.

       Applications  should  not  assume  a particular length for
<i>sun_path</i> or
       assume that it can  hold  {_POSIX_PATH_MAX}  bytes  (256).
</pre>   <h2><a   id="RATIONALE"  href="#RATIONALE"></a>RATIONALE
&nbsp;  &nbsp;   &nbsp;   &nbsp;   <a   href="#top_of_page"><span
class="top‐link">top</span></a></h2><pre>
       None.   </pre>  <h2><a  id="FUTURE_DIRECTIONS"  href="#FU‐
TURE_DIRECTIONS"></a>FUTURE DIRECTIONS  &nbsp; &nbsp; &nbsp; &nb‐
sp;        <a        href="#top_of_page"><span        class="top‐
link">top</span></a></h2><pre>
       None.    </pre>   <h2><a   id="SEE_ALSO"    href="#SEE_AL‐
SO"></a>SEE    ALSO     &nbsp;    &nbsp;    &nbsp;    &nbsp;   <a
href="#top_of_page"><span                             class="top‐
link">top</span></a></h2><pre>
       <a           href="../man0/sys_socket.h.0p.html">sys_sock‐
et.h(0p)</a>

       The  System  Interfaces   volume   of   POSIX.1‐2008,   <a
href="../man3/bind.3p.html">bind(3p)</a>,  <a href="../man3/sock‐
et.3p.html">socket(3p)</a>,
       <a    href="../man3/socketpair.3p.html">socketpair(3p)</a>
</pre>   <h2><a   id="COPYRIGHT"  href="#COPYRIGHT"></a>COPYRIGHT
&nbsp;  &nbsp;   &nbsp;   &nbsp;   <a   href="#top_of_page"><span
class="top‐link">top</span></a></h2><pre>
       Portions  of  this  text  are  reprinted and reproduced in
electronic form
       from IEEE Std 1003.1, 2013 Edition, Standard for  Informa‐
tion
       Technology ‐‐ Portable Operating System Interface (POSIX),
The Open
       Group Base Specifications Issue 7, Copyright (C)  2013  by
the
       Institute of Electrical and Electronics Engineers, Inc and
The Open
       Group.  (This is POSIX.1‐2008 with the 2013 Technical Cor‐
rigendum 1
       applied.)  In  the  event  of any discrepancy between this
version and
       the original IEEE and The Open Group Standard, the  origi‐
nal IEEE and
       The Open Group Standard is the referee document. The orig‐
inal
       Standard    can    be    obtained     online     at     <a
href="http://www.unix.org/online.html">http://www.unix.org/on‐
line.html</a> .

       Any typographical or formatting errors that appear in this
page are
       most  likely to have been introduced during the conversion
of the
       source files to man page format. To  report  such  errors,
see
       <a      href="https://www.kernel.org/doc/man‐pages/report‐
ing_bugs.html">https://www.kernel.org/doc/man‐pages/report‐
ing_bugs.html</a> .

<span  class="footline">IEEE/The  Open Group                 2013
sys_un.h(0P)</span> </pre>

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