285 lines
7.5 KiB
HTML
285 lines
7.5 KiB
HTML
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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>netdir_getbyname()--Translate a Given Host-Service Pair</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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<!-- RPCMST SCRIPT A converted by B2H R4.1 (346) (CMS) by PMHALL at -->
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<!-- RCHVMW2 on 7 Oct 1998 at 23:43:14 -->
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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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<!--Java sync-link-->
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<script language="Javascript" src="../rzahg/synch.js" type="text/javascript">
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</script>
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<a name="Top_Of_Page"></a>
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<h2>netdir_getbyname()--Translate a Given Host-Service Pair</h2>
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<div class="box" style="width: 60%;">
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<br>
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Syntax<br>
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<br>
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<pre>
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#include <netdir.h>
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int netdir_getbyname(struct netconfig *nconf,
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struct nd_hostserv *service,
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struct nd_addrlist **addrs);
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</pre>
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<br>
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Service Program Name: QZNFTRPC<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: No<br>
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<!-- iddvc RMBR -->
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<br>
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</div>
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<p>The <strong>netdir_getbyname()</strong> function maps the host name and
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service name that are specified in the <em>service</em> parameter to a set of
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addresses that are consistent with the transport identified in the
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<em>netconfig</em> structure.</p>
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<br>
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<h3>Parameters</h3>
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<dl>
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<dt><strong>nconf</strong> (Input) </dt>
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<dd>A pointer to a netconfig structure that is returned by either
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<strong>getnetconfig()</strong> or <strong>getnetconfigent()</strong>.<br>
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<br>
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</dd>
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<dt><strong>service</strong> (Input) </dt>
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<dd>A pointer to a service name.<br>
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<br>
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</dd>
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<dt><strong>addrs</strong> (Output) </dt>
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<dd>A pointer to the addresses being returned.</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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<table cellpadding="5">
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<!-- cols="5 95" -->
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<tr>
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<td align="left" valign="top"><em>0</em></td>
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<td align="left" valign="top"><strong>netdir_getbyname()</strong> was successful.</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>-1</em></td>
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<td align="left" valign="top"><strong>netdir_getbyname()</strong> was not successful. The
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<em>nd_errno</em> (defined in <strong><netdir.h></strong>) is set to
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indicate the error.</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 Conditions</h3>
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<p>If <strong>netdir_getbyname()</strong> is not successful, <em>nd_errno</em>
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usually indicates one of the following errors:</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>[ND_BADARG]</em></td>
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<td align="left" valign="top">Bad argument passed.</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>[ND_NOHOST]</em></td>
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<td align="left" valign="top">The host that was specified by the host name was not
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found.</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>[ND_NOMEM]</em></td>
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<td align="left" valign="top">Not enough memory left.</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>[ND_NO_RECOVERY]</em></td>
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<td align="left" valign="top">An unrecoverable error has occurred.</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>[ND_NOSERV]</em></td>
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<td align="left" valign="top">Service name is unknown.</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>[ND_SYSTEM]</em></td>
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<td align="left" valign="top">A damaged object was encountered. The damaged object cannot be
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used.</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>[ND_TRY_AGAIN]</em></td>
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<td align="left" valign="top">The local server did not receive a response from an
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authoritative server. An attempt at a later time may succeed.</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">CPF9872 E</td>
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<td width="85%" valign="top">Program or service program &1 in library &2 ended.
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Reason code &3.</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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<p><strong>netdir_getbyname()</strong> maps the host and service name to a set
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of addresses consistent with the transport specified in <em>netconfig</em>.</p>
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<p>The caller is responsible to free the storage allocated by
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<strong>netdir_getbyname()</strong> by using the function
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<strong>netdir_free()</strong>.</p>
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<p><strong>netdir_getbyname()</strong> does not support HOST_ANY or
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HOST_BROADCAST for host names specified in the <em>nd_hostserv</em>
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structure.</p>
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<br>
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<h3>Example</h3>
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<p>See <a href="../apiref/aboutapis.htm#codedisclaimer">Code disclaimer information</a>
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for information pertaining to code examples.</p>
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<p>The following example shows how <strong>netdir_getbyname()</strong> is
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used:</p>
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<pre>
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#include <netdir.h>
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main()
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{
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void *handlep; /* A handle into network selection */
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struct netconfig *nconf; /* transport information */
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struct nd_hostserv nd_hostserv; /* host and service information */
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struct nd_addrlist *nd_addrlistp; /* addresses for the service */
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/* Initialize the network selection mechanism */
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if (handlep = setnetconfig()) == (void *)NULL)
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{
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exit(1);
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}
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/* Get the netconfig handle */
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if ((nconf = getnetconfig(handlep)) == (struct netconf *)NULL)
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{
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printf("Error in getting the netconfig handle.\n");
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exit(1);
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}
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/* Allocate memory for host and service names */
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nd_hostserv.h_host = (char *)malloc(24);
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nd_hostserv.h_serv = (char *)malloc(24);
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if ((nd_hostserv.h_host == (char *)NULL)
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{
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printf("No memory available. <strong>netdir_getbyname()</strong>
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failed.\n");
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exit(1);
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}
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printf("Enter the hostname:\n");
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scanf("%s", nd_hostserv.h_host);
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printf("Enter the service name:\n");
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scanf("%s", nd_hostserv.h_serv);
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/* Get the address for the service on the host on the
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* transport provider specified in the netconfig structure
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*/
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if (netdir_getbyname(nconf, &nd_hostserv, &nd_addrlistp)
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!= ND_OK)
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{
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printf("Cannot determine address for service\n");
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exit(1);
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}
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printf("The address of the <%s> service on host
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<%s> was found.\n", nd_hostserv.h_serv,
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nd_hostserv.h_host);
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/* Free the netdir structure allocated by netdir_getbyname() */
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netdir_free(nd_addrlistp, ND_ADDRLIST);
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/* Release the netconfig handle allocated by set setnetconfig() */
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endnetconfig(handlep);
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}
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</pre>
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<br>
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<hr>
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API introduced: V4R2
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<hr>
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<table cellpadding="2" cellspacing="2" align="center">
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<tr align="center">
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<td valign="middle" align="center"><a href="#Top_Of_Page">Top</a> | <a href=
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"rpc1.htm">Remote Procedure Call (RPC) APIs</a> | <a href="aplist.htm">APIs by
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category</a></td>
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</tr>
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</table>
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</body>
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</html>
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