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| <h4 class="subsection">1.2.3 Berkeley Unix</h4> |
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| 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 C<!-- /@w --> and POSIX |
| facilities, and 4.4 BSD and newer releases of SunOS in fact support them all. |
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| <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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