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| <h4 class="subsection">1.2.4 SVID (The System V Interface Description)</h4> |
| |
| <p><a name="index-SVID-17"></a><a name="index-System-V-Unix-18"></a><a name="index-Unix_002c-System-V-19"></a> |
| The <dfn>System V Interface Description</dfn> (SVID) is a document describing |
| the AT&T Unix System V operating system. It is to some extent a |
| superset of the POSIX standard (see <a href="POSIX.html#POSIX">POSIX</a>). |
| |
| <p>The GNU C library defines most of the facilities required by the SVID |
| that are not also required by the ISO C<!-- /@w --> or POSIX standards, for |
| compatibility with System V Unix and other Unix systems (such as |
| SunOS) which include these facilities. However, many of the more |
| obscure and less generally useful facilities required by the SVID are |
| not included. (In fact, Unix System V itself does not provide them all.) |
| |
| <p>The supported facilities from System V include the methods for |
| inter-process communication and shared memory, the <code>hsearch</code> and |
| <code>drand48</code> families of functions, <code>fmtmsg</code> and several of the |
| mathematical functions. |
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