214 lines
5.8 KiB
HTML
214 lines
5.8 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>setpgid()--Set Process Group ID for Job Control</title>
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<!-- Begin Header Records ========================================== -->
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<!-- UNIX11 SCRIPT A converted by B2H R4.1 (346) (CMS) by V2DCIJB at -->
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<!-- RCHVMW2 on 1 Jun 1999 at 16:14:12 -->
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<!--End Header Records --><!-- Edited by Kersten Feb 02 -->
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<!-- This file has undergone error condition cleanup JULY 2002 by JET -->
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<link rel="stylesheet" type="text/css" href="../rzahg/ic.css">
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</head>
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<body>
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<a name="Top_Of_Page"></a>
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<!-- Java sync-link -->
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<script type="text/javascript" language="Javascript" src="../rzahg/synch.js">
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</script>
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<h2>setpgid()--Set Process Group ID for Job Control</h2>
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<div class="box" style="width: 50%;">
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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 <unistd.h>
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int setpgid(pid_t <em>pid</em>, pid_t <em>pgid</em>);
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</pre>
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<br>
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Service Program Name: QP0WSRV1<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 <strong>setpgid()</strong> function is used to either join an existing
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process group or create a new process group within the session of the calling
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process.</p>
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<p>See the <a href="#USGNOTE">Usage Notes</a> for considerations in using
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<strong>setpgid()</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><em>pid</em></strong></dt>
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<dd>(Input) The process ID of the process whose process group ID is to be
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changed. When <em>pid</em> has a value of zero, the process group ID of the
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calling process is changed.<br>
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<br>
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</dd>
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<dt><strong><em>pgid</em></strong></dt>
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<dd>(Input) The process group ID to be assigned to the process whose process ID
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matches <em>pid</em>. The value of <em>pgid</em> must be within the range of
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zero through the maximum signed integer. When pgid/em> has a value of zero,
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the process group ID is set to the process ID of the process indicated by <em>
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pid</em>.</dd>
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</dl>
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<br>
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<h3>Authorities</h3>
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<p>The process calling <strong>setpgid()</strong> must have the appropriate
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authority to the process being changed. A process is allowed to access the
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process group ID for a process if at least one of the following conditions is
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true:</p>
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<ul>
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<li>The process is calling <strong>setpgid()</strong> for its own process.<br>
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<br>
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</li>
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<li>The process has *JOBCTL special authority defined in the process user
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profile or in a current adopted user profile.<br>
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<br>
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</li>
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<li>The process is the parent of the process (the process being examined has a
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parent process ID equal to the process ID of the process calling <strong>
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setpgid()</strong>).<br>
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<br>
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</li>
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<li>The real or effective user ID of the process matches the real or effective
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user ID of the process calling <strong>setpgid()</strong>).</li>
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</ul>
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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>setpgid()</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>setpgid()</strong> was not successful.
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The <em>errno</em> variable is set to 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>setpgid()</strong> is not successful, <em>errno</em> usually
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indicates one of the following errors. Under some conditions, errno could
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indicate an error other than that listed here.</p>
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<dl>
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<dt><em>[EINVAL]</em></dt>
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<dd>
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<p>The value specified for the argument is not correct.</p>
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<p>A function was passed incorrect argument values, or an operation was
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attempted on an object and the operation specified is not supported for that
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type of object.</p>
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<p>An argument value is not valid, out of range, or NULL.</p>
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</dd>
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<dt><em>[EPERM]</em></dt>
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<dd>
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<p>Operation not permitted.</p>
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<p>You must have appropriate privileges or be the owner of the object or other
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resource to do the requested operation.</p>
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</dd>
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<dt><em>[ESRCH]</em></dt>
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<dd>
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<p>No item could be found that matches the specified value.</p>
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</dd>
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</dl>
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<br>
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<h3><a name="USGNOTE">Usage Notes</a></h3>
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<ol>
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<li>i5/OS does not support sessions. Until session support is available on
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i5/OS, the restriction that the process group must be within the session of
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the calling process will not be enforced.<br>
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<br>
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</li>
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<li>The <strong>setpgid()</strong> function fails if a nonzero process group ID
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is specified and that process group does not exist. If this occurs, the return
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value is set to -1 and <em>errno</em> is set to [EPERM].</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>The <<strong>sys/types.h</strong>> file (see <a href="unix13.htm">
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Header Files for UNIX-Type Functions</a>)<br>
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<br>
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</li>
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<li>The <<strong>unistd.h</strong>> file (see <a href="unix13.htm">Header
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Files for UNIX-Type Functions</a>)<br>
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<br>
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</li>
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<li><a href="getpgrp.htm">getpgrp()</a>--Get Process Group ID<br>
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<br>
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</li>
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<li><a href="qgtpgrp.htm">Qp0wGetPgrp()</a>--Get Process Group ID</li>
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</ul>
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<br>
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<hr>
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API introduced: V3R6
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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>
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</center>
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</body>
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</html>
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