356 lines
9.3 KiB
HTML
356 lines
9.3 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>clnt_create()--Create a Generic Client Handle</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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<!-- 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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<!-- 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 language="Javascript" src="../rzahg/synch.js" type="text/javascript">
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</script>
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<h2>clnt_create()--Create a Generic Client Handle</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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<!-- iddvc RMBR -->
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<br>
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<pre>
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#include <rpc/rpc.h>
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CLIENT *clnt_create(const char *<em>host</em>,
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const u_long <em>prognum</em>,
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const u_long <em>versnum</em>,
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const char *<em>nettype</em>);
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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>clnt_create()</strong> API creates and returns a generic client
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handle for program <em>prognum</em> and version <em>versnum</em> on a remote
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host where the server is located. This is done using an available transport of
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the <em>nettype</em> class. The <strong>clnt_create()</strong> API tries all
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the transports of the <em>nettype</em> class available from the /etc/netconfig
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file, and chooses the first successful one. Transports are tried in
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top-to-bottom order in the netconfig database. A default time-out is set and
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can be modified using <strong>clnt_control()</strong>.</p>
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<br>
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<h3>Parameters</h3>
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<dl>
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<dt><strong>host</strong> (Input) </dt>
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<dd>The name of the remote host where the server is located.<br>
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<br>
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</dd>
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<dt><strong>prognum</strong> (Input) </dt>
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<dd>The program number of the remote program.<br>
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<br>
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</dd>
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<dt><strong>vernum</strong> (Input) </dt>
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<dd>The version number of the remote program.<br>
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<br>
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</dd>
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<dt><strong>nettype</strong> (Input) </dt>
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<dd>The following classes of transport protocol are valid and are represented
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as a string either in lowercase or in uppercase: NETPATH, VISIBLE, CIRCUIT_V,
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DATAGRAM_V, CIRCUIT_N, DATAGRAM_N, TCP, and UDP. When this parameter is NULL,
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NETPATH is assumed.</dd>
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</dl>
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<br>
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<h3>Authorities</h3>
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<p>The caller of the <strong>clnt_create()</strong> API must have execute (*X)
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authority to the /etc directory and must have read (*R) authority to the
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netconfig file.</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="15 85" -->
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<tr>
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<td valign="top"><em>clnt</em></td>
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<td valign="top">Upon successful completion, this API returns a client
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handle.</td>
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</tr>
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<tr>
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<td valign="top"><em>NULL</em></td>
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<td valign="top"><strong>clnt_create()</strong> was not successful. The
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<em>rpc_createerr</em> variable is set to indicate the reason.</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>Upon failure, <strong>clnt_create()</strong> sets the global structure
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<em>rpc_createerr</em>. The <em>rpc_createerr.cf_stat</em> variable contains a
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status value that indicates the error reason. The
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<em>rpc_createerr.cf_error.re_errno</em> variable is meaningful when some
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status values are set.</p>
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<p>The <em>rpc_createerr.cf_stat</em> variable can be set to one of the
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following values:</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 valign="top"><em>[RPC_INTR]</em></td>
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<td valign="top">Interrupted RPC call. An exception has occurred in the RPC
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API. The <em>rpc_createerr.cf_error.re_errno</em> variable is set to
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EUNKNOWN.</td>
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</tr>
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<tr>
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<td valign="top"><em>[RPC_N2AXLATEFAILURE]</em></td>
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<td valign="top">Name-to-address translation failed. Cannot resolve the
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hostname given in <em>host</em>.</td>
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</tr>
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<tr>
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<td valign="top"><em>[RPC_SYSTEMERROR]</em></td>
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<td valign="top">An RPC error was returned from the system call. The
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<em>rpc_createerr.cf_error.re_errno</em> variable is set to the value returned
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from the failed call.
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<table cellpadding="5">
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<tr>
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<td valign="top"><em>[EACCES]</em></td>
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<td valign="top">Permission denied.</td>
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</tr>
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<tr>
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<td valign="top"><em>[EADDRINUSE]</em></td>
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<td valign="top">Local address is in use. This value is set when <em>host</em>
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is not valid or the file descriptor associated with it cannot be bound to any
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local address.</td>
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</tr>
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<tr>
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<td valign="top"><em>[EADDRNOTAVAIL]</em></td>
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<td valign="top">Address not available. This value is set when the address
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obtained by the <strong>rpcb_getaddr()</strong> is rejected by the transport
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layer.</td>
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</tr>
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<tr>
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<td valign="top"><em>[EAGAIN]</em></td>
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<td valign="top">Operation would have caused the process to be blocked.</td>
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</tr>
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<tr>
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<td valign="top"><em>[EBADF]</em></td>
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<td valign="top">Bad file descriptor. This value is set when <em>host</em> is
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not valid or the file descriptor associated with it is already closed or
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damaged.</td>
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</tr>
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<tr>
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<td valign="top"><em>[ECONNREFUSED]</em></td>
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<td valign="top">TI-RPC encountered a problem in the transport. The client
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cannot connect to the server.</td>
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</tr>
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<tr>
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<td valign="top"><em>[EFAULT]</em></td>
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<td valign="top">The address created by the <strong>rpcb_getaddr()</strong> was
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not available.</td>
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</tr>
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<tr>
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<td valign="top"><em>[EIO]</em></td>
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<td valign="top">Input/output error. This value is set as a result of network
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transport failure. It indicates that RPC cannot handle an error that occurred
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in lower transport levels.</td>
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</tr>
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<tr>
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<td valign="top"><em>[ENOBUFS]</em></td>
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<td valign="top">There is not enough buffer space available for the API.</td>
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</tr>
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<tr>
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<td valign="top"><em>[ENOMEM]</em></td>
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<td valign="top">Out of memory.</td>
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</tr>
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<tr>
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<td valign="top"><em>[EOPNOTSUPP]</em></td>
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<td valign="top">Operation is not supported. This value is set when
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<em>host</em> is not valid or the file descriptor associated with it has
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limited capabilities.</td>
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</tr>
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<tr>
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<td valign="top"><em>[EUNKNOWN]</em></td>
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<td valign="top">Unknown system state.</td>
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</tr>
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</table>
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</td>
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</tr>
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<tr>
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<td valign="top"><em>[RPC_UNKNOWNHOST]</em></td>
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<td valign="top">Unknown <em>host</em>.</td>
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</tr>
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<tr>
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<td valign="top"><em>[RPC_UNKNOWNPROTO]</em></td>
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<td valign="top">Unknown client/server protocol. The
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<em>rpc_createerr.cf_error.re_errno</em> is set with the errno value returned
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by <strong>setnetconfig()</strong> or <strong>getnetconfig()</strong> call.
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This error is set when the <em>netconf</em> pointer is NULL.</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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<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">CPIA1B1 I</td>
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<td width="85%" valign="top">A problem was encountered in the RPC client.</td>
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</tr>
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<tr>
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<td valign="top">CPIA1B2 I</td>
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<td valign="top">TI-RPC encountered a problem in the transport protocol.</td>
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</tr>
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<tr>
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<td valign="top">CPIA1B5 I</td>
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<td valign="top">An incorrect nettype was given.</td>
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</tr>
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<tr>
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<td valign="top">CPE3418 E</td>
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<td valign="top">Possible APAR condition or hardware failure.</td>
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</tr>
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<tr>
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<td valign="top">CPF3CF2 E</td>
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<td valign="top">Error(s) occurred during running of &1 API.</td>
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</tr>
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<tr>
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<td valign="top">CPF9872 E</td>
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<td 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>Related Information</h3>
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<ul>
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<li><a href="clnt_tp_create.htm">clnt_tp_create()--Create a Client
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Handle</a></li>
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<li><a href="clnt_tli_create.htm">clnt_tli_create()--Create a Client
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Handle</a></li>
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</ul>
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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>clnt_create()</strong> is used:</p>
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<pre>
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/* Define remote program number and version */
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#define RMTPROGNUM (u_long)0x3fffffffL
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#define RMTPROGVER (u_long)0x1
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#include <stdio.h>
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#include <rpc/rpc.h>
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main()
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{
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CLIENT *client;
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/* Service request to host RPCSERVER_HOST */
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client = <strong>clnt_create</strong>("as400.somewhere.ibm.com", RMTPROGNUM,
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RMTPROGVER, "TCP");
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if (client == (CLIENT *)NULL) {
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fprintf(stderr,"Couldn't create client\n");
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exit(1);
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}
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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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