368 lines
8.5 KiB
HTML
368 lines
8.5 KiB
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<meta name="Copyright" content="Copyright (c) 2006 by IBM Corporation">
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<title>socketpair()--Create a Pair of Sockets</title>
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<!-- Begin Header Records ========================================== -->
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<!-- Unix8 SCRIPT J converted by B2H R4.1 (346) (CMS) by V2KEA304 -->
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<!-- at RCHVMW2 on 17 Feb 1999 at 11:05:09 -->
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<!-- Change History: -->
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<!-- 021021 JTROUS Changes for Virus scanner, 98860, V5R3 -->
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<!-- and add 'lost' socket-vector description -->
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<!-- 040212 JTROUS Fix doc on scanning,match late ENOTSUP, v5r4 -->
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<!-- End Header Records ============================================ -->
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<!-- Edited by Kersten Feb 02 -->
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<link rel="stylesheet" type="text/css" href="../rzahg/ic.css">
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</head>
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<body>
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<a name="Top_Of_Page"></a>
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<!--Java sync-link-->
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<script type="text/javascript" language="Javascript" src="../rzahg/synch.js">
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</script>
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<h2>socketpair()--Create a Pair of Sockets</h2>
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<div class="box" style="width: 60%;">
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<br>
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BSD 4.3 Syntax<br>
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<pre>
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#include <sys/types.h>
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#include <sys/socket.h>
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int socketpair(int <em>address_family</em>,
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int <em>type</em>,
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int <em>protocol</em>,
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int *<em>socket_vector</em>)
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</pre>
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<br>
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Service Program Name: QSOSRV1<br>
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<!-- iddvc RMBR -->
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<br>
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Default Public Authority: *USE<br>
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<br>
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Threadsafe: Yes<br>
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<!-- iddvc RMBR -->
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<br>
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</div>
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<br>
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<div class="box" style="width: 60%;">
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<br>
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<a href="_xopen_source.htm">UNIX 98 Compatible Syntax</a><br>
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<pre>
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#define _XOPEN_SOURCE 520
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#include <sys/socket.h>
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int socketpair(int <em>address_family</em>,
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int <em>type</em>,
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int <em>protocol</em>,
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int <em>socket_vector</em>[2])
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</pre>
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<br>
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Service Program Name: QSOSRV1<br>
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<!-- iddvc RMBR -->
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<br>
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Default Public Authority: *USE<br>
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<!-- iddvc RMBR -->
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<br>
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Threadsafe: Yes<br>
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<!-- iddvc RMBR -->
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<br>
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</div>
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<br>
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<p>The <em>socketpair()</em> function is used to create a pair of unnamed,
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connected sockets in the <samp>AF_UNIX</samp> or <samp>AF_UNIX_CCSID</samp>
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<em>address_family</em>.</p>
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<p> There are two versions of
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the API, as shown above. The base i5/OS API uses BSD 4.3 structures and
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syntax. The other uses syntax and structures compatible with the UNIX 98
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programming interface specifications. You can select the UNIX 98 compatible
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interface with the <a href="_xopen_source.htm">_XOPEN_SOURCE</a> macro.</p>
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<br>
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<h3>Parameters</h3>
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<dl>
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<dt><strong>address_family</strong></dt>
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<dd>(Input) The address family to be used with the sockets. Supported values
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are:<br>
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<br>
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<table cellpadding="5">
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<!-- cols="15 85" -->
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<tr>
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<td align="left" valign="top"><samp>AF_UNIX</samp> or
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<samp>AF_UNIX_CCSID</samp></td>
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<td align="left" valign="top">For interprocess communications between processes
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on the same system in the UNIX domain.</td>
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</tr>
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</table>
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<br>
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</dd>
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<dt><strong>type</strong></dt>
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<dd>(Input) The type of communications desired. Supported values are:<br>
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<br>
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</dl>
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<table cellpadding="5">
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<!-- cols="15 85" -->
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<tr>
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<td align="left" valign="bottom" width="20%"><samp>SOCK_DGRAM</samp></td>
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<td align="left" valign="bottom" width="80%">Indicates a datagram socket is
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desired.</td>
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</tr>
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<tr>
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<td align="left" valign="bottom"><samp>SOCK_STREAM</samp></td>
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<td align="left" valign="bottom">Indicates a full-duplex stream socket is
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desired.</td>
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</tr>
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</table>
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<dl>
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<dt><strong>protocol</strong></dt>
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<dd>(Input) The protocol to be used on the sockets. Supported values are:</dd>
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</dl>
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<table cellpadding="5">
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<!-- cols="5 95" -->
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<tr>
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<td align="left" valign="top">0</td>
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<td align="left" valign="top">Indicates the default protocol for the
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<em>type</em> selected is to be used.</td>
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</tr>
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</table>
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<Dl>
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<dt><strong>socket_vector</strong></dt>
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<DD>(Output) An integer array of size two that will
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contain the socket descriptors.</dd>
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</DL>
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<br>
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<h3>Authorities</h3>
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<p>No authorization is required.</p>
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<br>
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<h3>Return Value</h3>
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<p><em>socketpair()</em> returns an integer. Possible values are:</p>
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<ul>
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<li>-1 (unsuccessful)</li>
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<li>0 (successful)</li>
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</ul>
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<br>
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<h3>Error Conditions</h3>
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<p>When <em>socketpair()</em> fails, <em>errno</em> can be set to one of the
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following:</p>
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<table cellpadding="5">
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<!-- cols="25 75" -->
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<tr>
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<td align="left" valign="top"><em>[EAFNOSUPPORT]</em></td>
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<td align="left" valign="top">The type of socket is not supported in this
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protocol family.<br>
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<br>
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</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>[EFAULT]</em></td>
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<td align="left" valign="top">Bad address.<br>
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<br>
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</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>[EINVAL]</em></td>
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<td align="left" valign="top">Parameter not valid.<br>
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<br>
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</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>[EIO]</em></td>
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<td align="left" valign="top">Input/output error.<br>
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<br>
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</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>[EMFILE]</em></td>
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<td align="left" valign="top">Too many descriptions for this process.<br>
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<br>
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</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>[ENFILE]</em></td>
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<td align="left" valign="top">Too many descriptions in system.<br>
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<br>
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</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>[ENOBUFS]</em></td>
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<td align="left" valign="top">There is not enough buffer space for the
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requested operation.<br>
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<br>
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</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>[EOPNOTSUPP]</em></td>
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<td align="left" valign="top">Operation not supported.<br>
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<br>
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</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>[EPROTONOSUPPORT]</em></td>
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<td align="left" valign="top">No protocol of the specified type and domain
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exists.<br>
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<br>
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</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>[ESOCKTNOSUPPORT]</em></td>
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<td align="left" valign="top">The specified socket type is not supported.<br>
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<br>
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</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>[EUNKNOWN]</em></td>
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<td align="left" valign="top">Unknown system state.</td>
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</tr>
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</table>
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<br>
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<br>
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<h3>Error Messages</h3>
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<table width="100%" cellpadding="5">
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<!-- cols="15 85" -->
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<tr>
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<th align="left" valign="top">Message ID</th>
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<th align="left" valign="top">Error Message Text</th>
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</tr>
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<tr>
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<td width="15%" valign="top">CPE3418 E</td>
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<td width="85%" valign="top">Possible APAR condition or hardware failure.</td>
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</tr>
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<tr>
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<td align="left" valign="top">CPF9872 E</td>
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<td align="left" valign="top">Program or service program &1 in library
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&2 ended. Reason code &3.</td>
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</tr>
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<tr>
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<td align="left" valign="top">CPFA081 E</td>
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<td align="left" valign="top">Unable to set return value or error code.</td>
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</tr>
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</table>
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<br>
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<br>
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<h3>Usage Notes</h3>
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<ol>
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<li>The socket address families and types supported by sockets are defined in
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<strong><sys/socket.h></strong>.<br>
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<br>
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</li>
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<li>When you develop in C-based
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languages and an application is compiled with the _XOPEN_SOURCE macro defined
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to the value 520 or greater, the <em>socketpair()</em> API is mapped to
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<em>qso_socketpair98()</em>.
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<br><br></li>
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<li>If this function is called
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by a thread executing one of the scan-related exit programs (or any of its
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created threads),
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<img src="delta.gif" alt="Start of change">
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it will fail with error code [ENOTSUP].
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<img src="deltaend.gif" alt="End of change">
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See
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<a href="ifsopenexit.htm">Integrated File System Scan on Open Exit Programs</a>
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and <a href="ifscloseexit.htm">Integrated File System Scan on Close Exit
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Programs</a> for more information.
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</li>
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</ol>
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<br>
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<h3>Related Information</h3>
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<ul>
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<li><a href=
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"_xopen_source.htm">_XOPEN_SOURCE</a>--Using _XOPEN_SOURCE for the UNIX 98
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compatible interface<br>
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<br>
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</li>
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<li><a href="socket.htm">socket()</a>--Create Socket</li>
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</ul>
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<br>
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<hr>
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<p>API introduced: V3R1<br>
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</p>
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<hr>
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<center>
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<table cellpadding="2" cellspacing="2">
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<tr align="center">
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<td valign="middle" align="center"><a href="#Top_Of_Page">Top</a> |
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<a href="unix.htm">UNIX-Type APIs</a> |
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<a href="aplist.htm">APIs by category</a> </td>
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</tr>
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</table>
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</center>
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</body>
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</html>
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