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<h4 class="subsection">1.2.3 Berkeley Unix</h4>

<p><a name="index-BSD-Unix-12"></a><a name="index-g_t4_002e_0040var_007bn_007d-BSD-Unix-13"></a><a name="index-Berkeley-Unix-14"></a><a name="index-SunOS-15"></a><a name="index-Unix_002c-Berkeley-16"></a>
The GNU C library defines facilities from some versions of Unix which
are not formally standardized, specifically from the 4.2 BSD, 4.3 BSD,
and 4.4 BSD Unix systems (also known as <dfn>Berkeley Unix</dfn>) and from
<dfn>SunOS</dfn> (a popular 4.2 BSD derivative that includes some Unix System
V functionality).  These systems support most of the ISO&nbsp;C<!-- /@w --> and POSIX
facilities, and 4.4 BSD and newer releases of SunOS in fact support them all.

   <p>The BSD facilities include symbolic links (see <a href="Symbolic-Links.html#Symbolic-Links">Symbolic Links</a>), the
<code>select</code> function (see <a href="Waiting-for-I_002fO.html#Waiting-for-I_002fO">Waiting for I/O</a>), the BSD signal
functions (see <a href="BSD-Signal-Handling.html#BSD-Signal-Handling">BSD Signal Handling</a>), and sockets (see <a href="Sockets.html#Sockets">Sockets</a>).

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