269 lines
6.8 KiB
HTML
269 lines
6.8 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>givedescriptor()--Pass Descriptor Access to Another Job</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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<!-- 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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<link rel="stylesheet" type="text/css" href="../rzahg/ic.css">
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</head>
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<body>
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<!--End Header Records -->
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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>givedescriptor()--Pass Descriptor Access to Another Job</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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<pre>
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#include <sys/types.h>
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#include <sys/socket.h>
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int givedescriptor(int <em>descriptor</em>,
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char *<em>target_job</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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<p>The <em>givedescriptor()</em> function is used to pass a descriptor from one
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i5/OS job to another i5/OS job.</p>
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<br>
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<h3>Parameters</h3>
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<dl>
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<dt><strong>descriptor</strong></dt>
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<dd>(Input) The descriptor that is to be passed to the target job.<br>
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<br>
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</dd>
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<dt><strong>target_job</strong></dt>
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<dd>(Input) A pointer to the internal job identifier of the target job that is
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to receive the descriptor referenced by the <em>descriptor</em> parameter.</dd>
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</dl>
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<br>
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<h3>Authorities</h3>
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<p>To give a descriptor, the source thread must be running under one of the
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following user profiles:</p>
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<ul>
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<li>A user profile that is the same as the job user identity of the target
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job<br>
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<br>
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</li>
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<li>A user profile that has all object (*ALLOBJ) special authority</li>
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</ul>
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<p>The <strong>job user identity</strong> is the name of the user profile by
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which a job is known to other jobs. It is described in more detail in the
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<a href="../rzaks/rzaks1.htm">Work Management</a> topic.</p>
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<br>
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<h3>Return Value</h3>
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<p><em>givedescriptor()</em> returns an integer. Possible values are: </p>
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<ul>
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<li>-1 (unsuccessful)<br>
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<br>
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</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>givedescriptor()</em> fails, <em>errno</em> can be set to one of
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the following:</p>
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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"><em>[EACCES]</em></td>
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<td align="left" valign="top">Permission denied.
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<p>The job does not have the appropriate privileges required to give the
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descriptor.</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"><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>target_job</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.
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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>target_job</em> parameter points to data that is not valid.<br>
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<br>
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</li>
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<li>The <em>target_job</em> parameter refers to a job that is not active.</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>[EOPNOTSUPP]</em></td>
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<td align="left" valign="top">Operation not supported.
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<p>The underlying instance represented by the descriptor does not support
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passing access rights.</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>[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><br>
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<h3><a name="USAGE_NOTES">Usage Notes</a></h3>
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<ol>
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<li>The information to specify in the <em>target_job</em> parameter can be
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obtained in the actual target job by using a work management API (for example,
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<strong>QUSRJOBI</strong>) to retrieve the <em>internal job identifier</em>.
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<p>It is the responsibility of the application programmer to privately pass
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this information from the target job to the job that issues the
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<em>givedescriptor()</em>. One possible method that could be used to exchange
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this information is to use data queues.</p>
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</li>
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<li>The <em>target_job</em> does not have to be waiting on a
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<em>takedescriptor()</em> for the <em>givedescriptor()</em> to complete
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successfully.<br>
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<br>
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</li>
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<li>If both the job in which the <em>givedescriptor()</em> is issued and the
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<em>target_job</em> end while a descriptor is in transit, the descriptor is
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reclaimed by the system, and the resource that it represents is closed.<br>
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<br>
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</li>
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<li>For files and directories, <em>givedescriptor()</em> is only supported for
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objects in the
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Root, QOpenSys, User-defined file systems (UDFS), and Network File System (NFS).
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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="tksoc.htm">takedescriptor()</a>--Receive Socket Access from Another
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Job<br>
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<br>
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</li>
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<li><a href="sendms.htm">sendmsg()</a>--Send Data or Descriptors or Both<br>
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<br>
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</li>
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<li><a href="recvms.htm">recvmsg()</a>--Receive Data or Descriptors or Both<br>
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<br>
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</li>
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<li><a href="spawn.htm">spawn()</a>--Spawn Process</li>
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</ul>
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<br>
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<hr>
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API introduced: V3R1
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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> | <a href=
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"unix.htm">UNIX-Type APIs</a> | <a href="aplist.htm">APIs by category</a></td>
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</tr>
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</table></center>
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</body>
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</html>
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