673 lines
19 KiB
HTML
673 lines
19 KiB
HTML
<!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>bind()--Set Local Address for Socket</title>
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<!-- Begin Header Records ========================================== -->
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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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<!-- Change History: -->
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<!-- YYMMDD USERID Change description -->
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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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<!-- Edited by Kersten Feb 02 -->
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<!-- End Header Records -->
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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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<!--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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<a name="Top_Of_Page"></a>
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<h2>bind()--Set Local Address for Socket</h2>
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<div class="box" style="width: 70%;">
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<p><br>
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BSD 4.3 Syntax<br>
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</p>
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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 bind(int <em>socket_descriptor</em>,
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struct sockaddr *<em>local_address</em>,
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int <em>address_length</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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<!-- 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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<div class="box" style="width: 70%;">
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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 bind(int <em>socket_descriptor</em>,
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const struct sockaddr *<em>local_address</em>,
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socklen_t <em>address_length</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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<!-- 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>bind()</em> function is used to associate a local address with a
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socket.</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>socket_descriptor</strong></dt>
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<dd>(Input) The descriptor of the socket that is to be bound.<br>
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<br>
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</dd>
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<dt><strong>local_address</strong></dt>
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<dd>(Input) A pointer to a buffer of type <strong>struct sockaddr</strong> that
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contains the local address to which the socket is to be bound. The structure
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<strong>sockaddr</strong> is defined in <strong><sys/socket.h></strong>.
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<p> The BSD 4.3 structure
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is:</p>
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<pre>
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struct sockaddr {
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u_short sa_family;
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char sa_data[14];
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};
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</pre>
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<p>The BSD 4.4/UNIX 98 compatible structure is:</p>
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<pre>
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typedef uchar sa_family_t;
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struct sockaddr {
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uint8_t sa_len;
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sa_family_t sa_family;
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char sa_data[14];
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};
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</pre>
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<p>The BSD 4.4 <em>sa_len</em> field is the length of the address. The <em>sa_family</em> field identifies
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the address family to which the address belongs, and <em>sa_data</em> is the
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address whose format is dependent on the address family.</p>
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</dd>
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<dt><strong>address_length</strong></dt>
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<dd>(Input) The length of the <em>local_address</em>.</dd>
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</dl>
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<br>
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<h3>Authorities</h3>
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<ul>
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<li>When the address type of the socket identified by the
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<strong>socket_descriptor</strong> is AF_INET, the thread must have retrieve,
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insert, delete, and update authority to the port specified by the
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<strong>local_address</strong> field. When the thread does not have this level
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of authority, an <em>errno</em> of EACCES is returned.<br>
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<br>
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</li>
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<li>When the address type of the socket identified by the
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<strong>socket_descriptor</strong> is AF_INET and is running IP over SNA, the
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thread must have retrieve, insert, delete, and update authority to the APPC
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device. When the thread does not have this level of authority, an
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<em>errno</em> of EACCES is returned.</li>
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</ul>
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<br>
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<h3>Return Value</h3>
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<p><em>bind()</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 a <em>bind()</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>[EACCES]</em></td>
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<td align="left" valign="top">Permission denied.
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<p>The process does not have the appropriate privileges to bind
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<em>local_address</em> to the socket pointed to by <em>socket_descriptor</em>
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(for example, if <em>socket_descriptor</em> is a socket with an address family
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of <samp>AF_INET</samp>, and the <strong>sockaddr_in</strong> structure
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(pointed to by <em>local_address</em>) specified a port that was restricted for
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use).</p>
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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>[EADDRINUSE]</em></td>
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<td align="left" valign="top">Address already in use.
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<p>This error code indicates one of the following:</p>
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<ul>
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<li>The <em>socket_descriptor</em> points to a socket with an address family of
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<samp>AF_INET</samp>, and the address specified in the
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<strong>sockaddr_in</strong> structure (pointed to by <em>local_address</em>)
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has already been assigned to another socket.</li>
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<li> The
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<em>socket_descriptor</em> points to a socket with an address family of
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<samp>AF_INET6</samp>, and the address specified in the
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<strong>sockaddr_in6</strong> structure (pointed to by <em>local_address</em>)
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has already been assigned to another socket.</li>
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<li>The <em>socket_descriptor</em> points to a socket with an address family of
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<samp>AF_UNIX</samp> or <samp>AF_UNIX_CCSID</samp>, and the address specified
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in the <strong>sockaddr_un</strong> or <strong>sockaddr_unc</strong> structure
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(pointed to by <em>local_address</em>) has already been assigned to another
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socket.<br>
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</li>
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</ul>
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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>[EADDRNOTAVAIL]</em></td>
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<td align="left" valign="top">Address not available. This error code indicates
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one of the following:<br>
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<br>
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<ul>
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<li>The <em>socket_descriptor</em> points to a socket with an address family of
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<samp>AF_INET</samp>, and the IP address specified in the
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<strong>sockaddr_in</strong> structure (pointed to by <em>local_address</em>)
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is not one defined by the local interfaces.</li>
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<li> The
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<em>socket_descriptor</em> points to a socket with an address family of
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<samp>AF_INET6</samp>, and the IP address specified in the
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<strong>sockaddr_in6</strong> structure (pointed to by <em>local_address</em>)
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is not one defined by the local interfaces.<br>
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</li>
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</ul>
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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>[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.
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<p>The address family specified in the address structure pointed to by
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<em>local_address</em> parameter cannot be used with the socket pointed to by
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the <em>socket_descriptor</em> parameter.</p>
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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>[EBADF]</em></td>
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<td align="left" valign="top">Descriptor 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"><img src="delta.gif" alt="Start of change">
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<em>[EDESTADDRREQ]</em></td>
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<td align="left" valign="top">The <em>local_address</em> parameter is a null pointer.<br>
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<br>
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<p>This error code is only returned on sockets that use the
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<samp>AF_UNIX</samp> or <samp>AF_UNIX_CCSID</samp> address family.</p>
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<img src="deltaend.gif" alt="End of change">
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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.
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<p>The system detected an address which was not valid while attempting to
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access the <em>local_address</em> parameter.</p>
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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. This error code indicates
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one of the following:<br>
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<br>
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<ul>
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<li>The <em>address_length</em> parameter specifies a length that is negative
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or is not valid for the address family.<br>
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<br>
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</li>
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<li>The socket referenced by <em>socket_descriptor</em> is not a socket of type
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SOCK_RAW and is already bound to an address.<br>
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<br>
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</li>
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<li>The local address pointed to by the <em>local_address</em> parameter
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specified an address that was not valid.<br>
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<br>
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</li>
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<li>The <em>socket_descriptor</em> points to a socket with an address family of
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<samp>AF_UNIX_CCSID</samp>, and the CCSID specified in <em>sunc_qlg</em> in the
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<strong>sockaddr_unc</strong> structure (pointed to by <em>local_address</em>)
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cannot be converted to the current default CCSID for integrated file system
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path names.<br>
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<br>
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</li>
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<li>The <em>socket_descriptor</em> points to a socket with an address family of
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<samp>AF_UNIX_CCSID</samp>, and there was an incomplete character or shift
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state sequence at the end of <em>sunc_path</em> in the
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<strong>sockaddr_unc</strong> structure (pointed to by
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<em>local_address</em>).<br>
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<br>
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</li>
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<li>The <em>socket_descriptor</em> points to a socket with an address family of
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<samp>AF_UNIX_CCSID</samp>, and the <strong>sockaddr_unc</strong> structure
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(pointed to by <em>local_address</em>) was not valid:<br>
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<br>
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<ul>
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<li>The sunc_format was not set to SO_UNC_DEFAULT or SO_UNC_USE_QLG.<br>
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<br>
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</li>
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<li>The sunc_zero was not initialized to zeros.<br>
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<br>
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</li>
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<li>The sunc_format field was set to SO_UNC_USE_QLG and the sunc_qlg structure
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was not valid:<br>
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<br>
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<ul>
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<li>The path type was less than 0 or greater than 3.<br>
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<br>
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</li>
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<li>The path length was less than 0 or out of bounds. For example, a
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single-byte path name was greater than 126 bytes or a double-byte path name was
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greater than 252 bytes.<br>
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<br>
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</li>
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<li>A reserved field was not initialized to zeros.</li>
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</ul>
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</li>
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</ul>
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</li>
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</ul>
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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>[ELOOP]</em></td>
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<td align="left" valign="top">A loop exists in symbolic links encountered
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during pathname resolution.
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<p>This error code is only returned on sockets that use the
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<samp>AF_UNIX</samp> or <samp>AF_UNIX_CCSID</samp> address family.</p>
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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>[ENAMETOOLONG]</em></td>
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<td align="left" valign="top">File name too long.
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<p>This error code is only returned on sockets that use the
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<samp>AF_UNIX</samp> or <samp>AF_UNIX_CCSID</samp> address family.</p>
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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>[ENOENT]</em></td>
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<td align="left" valign="top">No such file or directory.
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<p>This error code is only returned on sockets that use the
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<samp>AF_UNIX</samp> or <samp>AF_UNIX_CCSID</samp> address family.</p>
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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>[ENOSYS]</em></td>
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<td align="left" valign="top">Function not implemented.
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<p>This error code is only returned on sockets that use the
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<samp>AF_UNIX</samp> or <samp>AF_UNIX_CCSID</samp> or
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<samp>AF_UNIX_CCSID</samp> address family.</p>
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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>[ENOTDIR]</em></td>
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<td align="left" valign="top">Not a directory.
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<p>This error code is only returned on sockets that use the
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<samp>AF_UNIX</samp> or <samp>AF_UNIX_CCSID</samp> address family.</p>
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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>[ENOTSOCK]</em></td>
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<td align="left" valign="top">The specified descriptor does not reference a
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socket.<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.<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>[EUNATCH]</em></td>
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<td align="left" valign="top">The protocol required to support the specified
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address family is not available at this time.</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>For sockets that use an address family of <samp>AF_UNIX</samp> or
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<samp>AF_UNIX_CCSID</samp>, the following is applicable:<br>
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<br>
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<ul>
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<li>The process must have the following types of permission:
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<ul>
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<li>Create permission to the directory in which the entry is to be
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created.</li>
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<li>Search permission along all the components of the path.</li>
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</ul>
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<p>Also, processes trying to establish a connection with the <em>connect()</em>
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must have write access to the entry that is created.</p>
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</li>
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<li>For <samp>AF_UNIX</samp>, the path name is assumed to be in the default
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coded character set identifier (CCSID) currently in effect for the job. For
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<samp>AF_UNIX_CCSID</samp>, the path name is assumed to be in the format and
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CCSID specified in the <strong>sockaddr_unc</strong> (pointed to by
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<em>local_address</em>).<br>
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<br>
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</li>
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|
|
<li>When the socket is no longer needed, the caller should remove the file
|
|
system entry that was created by the <em>bind()</em> using the
|
|
<em>unlink()</em> or Qp0lunlink() system function.</li>
|
|
</ul>
|
|
|
|
<br>
|
|
<br>
|
|
</li>
|
|
|
|
<li>For sockets that use an address family of <samp>AF_INET</samp>, the
|
|
following is applicable:<br>
|
|
<br>
|
|
<ul>
|
|
<li>The internet address structure <strong>sockaddr_in</strong> requires a
|
|
2-byte port number and a 32-bit IP address. You can have the system
|
|
automatically select a port number by setting the port number to 0.
|
|
|
|
<p> The BSD 4.3 structure
|
|
is:</p>
|
|
|
|
<pre>
|
|
struct sockaddr_in {
|
|
short sin_family;
|
|
u_short sin_port;
|
|
struct in_addr sin_addr;
|
|
char sin_zero[8];
|
|
};
|
|
</pre>
|
|
|
|
<p>The BSD 4.4/UNIX 98 compatible structure is:</p>
|
|
|
|
<pre>
|
|
typedef uchar sa_family_t;
|
|
|
|
struct sockaddr_in {
|
|
uint8_t sin_len;
|
|
sa_family_t sin_family;
|
|
u_short sin_port;
|
|
struct in_addr sin_addr;
|
|
char sin_zero[8];
|
|
};
|
|
</pre>
|
|
|
|
<p>The BSD 4.4 <em>sin_len</em> field is the length of the address. The <em>sin_family</em> is the address
|
|
family (always AF_INET for TCP and UDP), <em>sin_port</em> is the port number,
|
|
and <em>sin_addr</em> is the internet address. The <em>sin_zero</em> field is
|
|
reserved and must be hex zeros.</p>
|
|
</li>
|
|
|
|
<li>A wildcard address is provided (<samp>INADDR_ANY</samp> defined in
|
|
<strong><netinet/in.h></strong>) that allows an application to receive
|
|
messages directed to a specified port independent of the IP address that was
|
|
specified. If a local IP address is specified, only data received on that IP
|
|
address is made available. <samp>INADDR_ANY</samp> must be used to receive data
|
|
from multiple local interface definitions.</li>
|
|
</ul>
|
|
|
|
<br>
|
|
<br>
|
|
</li>
|
|
|
|
<li> For sockets that use an
|
|
address family of <samp>AF_INET6</samp>, the following is applicable:<br>
|
|
<br>
|
|
<ul>
|
|
<li>The internet address structure <strong>sockaddr_in6</strong> requires a
|
|
2-byte port number and a 128-bit IP address. You can have the system
|
|
automatically select a port number by setting the port number to 0.
|
|
|
|
<p>The BSD 4.3 structure is:</p>
|
|
|
|
<pre>
|
|
typedef unsigned short sa_family_t;
|
|
typedef unsigned short in_port_t;
|
|
|
|
struct sockaddr_in6 {
|
|
sa_family_t sin6_family;
|
|
in_port_t sin6_port;
|
|
uint32_t sin6_flowinfo;
|
|
struct in6_addr sin6_addr;
|
|
uint32_t sin6_scope_id;
|
|
};
|
|
</pre>
|
|
|
|
<p>The BSD 4.4/UNIX 98 compatible structure is:</p>
|
|
|
|
<pre>
|
|
typedef uchar sa_family_t;
|
|
typedef unsigned short in_port_t;
|
|
|
|
struct sockaddr_in6 {
|
|
uint8_t sin6_len;
|
|
sa_family_t sin6_family;
|
|
in_port_t sin6_port;
|
|
uint32_t sin6_flowinfo;
|
|
struct in6_addr sin6_addr;
|
|
uint32_t sin6_scope_id;
|
|
};
|
|
</pre>
|
|
|
|
<p>The BSD 4.4 <em>sin6_len</em> field is the length of the address. The
|
|
<em>sin6_family</em> is the address family (AF_INET6 in this case),
|
|
<em>sin6_port</em> is the port number, and <em>sin6_addr</em> is the internet
|
|
address. The <em>sin6_flowinfo</em> field contains two pieces of information:
|
|
the traffic class and the flow label. Note: This field is currently not
|
|
supported and should be set to zero for upward compatibility. The
|
|
<em>sin6_scope_id</em> field identifies a set of interfaces as appropriate for
|
|
the scope of the address carried in the <em>sin6_addr</em> field. Note: This
|
|
field is currently not supported and should be set to zero for upward
|
|
compatibility.</p>
|
|
</li>
|
|
|
|
<li>A wildcard address is provided that allows an application to receive
|
|
messages directed to a specified port independent of the IP address that was
|
|
specified. Since the IPv6 address type is a structure (<samp>struct
|
|
in6_addr</samp>), a symbolic constant can be used to initialize an IPv6 address
|
|
variable, but cannot be used in an assignment. Therfore, the IPv6 wildcard
|
|
address is provided in two forms as defined in
|
|
<strong><netinet/in.h></strong>. The first version is a global variable
|
|
named <samp>in6addr_any</samp>. This version is used similarly to the way
|
|
applications use the <samp>INADDR_ANY</samp> in IPv4 as defined above and must
|
|
be used for structure assignment. The other version is a symbolic constant
|
|
named <samp>IN6ADDR_ANY_INIT</samp>. This version may be used to initialize an
|
|
<samp>in6_addr</samp> structure. If a local IP address is specified, only data
|
|
received on that IP address is made available. The wildcard address must be
|
|
used to receive data from multiple local interface definitions.</li>
|
|
</ul>
|
|
|
|
<br>
|
|
<br>
|
|
</li>
|
|
|
|
<li>When you develop in C-based
|
|
languages and an application is compiled with the _XOPEN_SOURCE macro defined
|
|
to the value 520 or greater, the <em>bind()</em> API is mapped to
|
|
<em>qso_bind98()</em>.</li>
|
|
</ol>
|
|
|
|
<br>
|
|
|
|
|
|
<h3>Related Information</h3>
|
|
|
|
<ul>
|
|
<li><a href=
|
|
"_xopen_source.htm">_XOPEN_SOURCE</a>--Using _XOPEN_SOURCE for the UNIX 98
|
|
compatible interface<br>
|
|
<br>
|
|
</li>
|
|
|
|
<li><a href="connec.htm">connect()</a>--Establish Connection or Destination
|
|
Address</li>
|
|
</ul>
|
|
|
|
<br>
|
|
<hr>
|
|
API introduced: V3R1
|
|
|
|
<hr>
|
|
<center>
|
|
<table cellpadding="2" cellspacing="2">
|
|
<tr align="center">
|
|
<td valign="middle" align="center"><a href="#Top_Of_Page">Top</a> | <a href=
|
|
"unix.htm">UNIX-Type APIs</a> | <a href="aplist.htm">APIs by category</a></td>
|
|
</tr>
|
|
</table></center>
|
|
</body>
|
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</html>
|
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|