308 lines
8.4 KiB
HTML
308 lines
8.4 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>Qp0wChkPid()--Check Status for Process ID</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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<!-- 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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<!-- Edited by Kersten Feb 02 -->
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<!-- This file has undergone html cleanup July 2002 by JET -->
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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>Qp0wChkPid()--Check Status for Process ID</h2>
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<div class="box" style="width: 70%;">
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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 <qp0wpid.h>
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int Qp0wChkPid(pid_t <em>pid</em>,
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QP0W_PID_Data_T *<em>pidinfo</em>);
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</pre>
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<br>
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Service Program Name: QP0WPID<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>Qp0wChkPid()</strong> function returns the status and process
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table entry information for the process specified by the process ID
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<em>pid</em>.</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 table information is to
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be returned. When <em>pid</em> has a value of binary 0, the process table
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information for the current process is returned.<br>
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<br>
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</dd>
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<dt><strong><em>*pidinfo</em></strong></dt>
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<dd>(Output) A pointer to the <samp>QP0W_PID_Data_T</samp> structure. The
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process table entry information for the process identified by <em>pid</em> is
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stored in the location pointed to by the <em>pidinfo</em> parameter.</dd>
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</dl>
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<p>The structure <samp>QP0W_PID_Data_T</samp> is defined in
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<strong><qp0wpid.h></strong> header file as follows:</p>
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<pre>
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typedef struct QP0W_PID_Data_T {
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pid_t pid;
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pid_t ppid;
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pid_t pgrp;
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int status;
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unsigned int exit_status;
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} QP0W_PID_Data_T;
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</pre>
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<p>The members of the <samp>QP0W_PID_Data_T</samp> structure are as
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follows:</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>pid_t pid;</em></td>
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<td align="left" valign="top">The process ID of the process.<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>pid_t ppid;</em></td>
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<td align="left" valign="top">The process ID of the parent process. If
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<samp>ppid</samp> has a value of binary 1, there is no parent process
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associated with the process.<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>pid_t pgrp;</em></td>
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<td align="left" valign="top">The process group ID of the process.<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>int status;</em></td>
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<td align="left" valign="top">A collection of flag bits that describe the
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current state of the process. The following flag bits can be set in
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<samp>status</samp>:<br>
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<table cellpadding="5">
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<tr>
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<td align="left" valign="top"><em>QP0W_PID_TERMINATED</em></td>
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<td align="left" valign="top">The process has ended.</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>QP0W_PID_StopPED</em></td>
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<td align="left" valign="top">The process has been stopped by a signal.</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>QP0W_PID_CHILDWAIT</em></td>
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<td align="left" valign="top">The process is waiting for a child process to be
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ended or stopped by a signal.</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>QP0W_PID_SIGNALStop</em></td>
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<td align="left" valign="top">The process has requested that the SIGCHLD signal
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be generated for the process when one of it's child processes has been stopped
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by a signal.</td>
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</tr>
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</table>
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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>unsigned int exit_status;</em></td>
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<td align="left" valign="top">Exit status of the process. This member only has
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meaning if the <samp>status</samp> has been set to
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<samp>QP0W_PID_TERMINATED</samp>. Refer to the <strong>wait</strong>() function
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for a description of the exit status for a process.<br>
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</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>Authorities</h3>
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<p>The process calling <strong>Qp0wChkPid()</strong> must have the appropriate
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authority to the process being examined. A process is allowed to examine the
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process table information for a process if at least one of the following
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conditions is true:</p>
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<ul>
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<li>The process is calling <strong>Qp0wChkPid()</strong> for its own
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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
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<strong>Qp0wChkPid()</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>Qp0wChkPid()</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="10 90" -->
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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>Qp0wChkPid()</strong> was
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successful.</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>value</em></td>
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<td align="left" valign="top"><strong>Qp0wChkPid()</strong> was not successful.
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The value returned indicates one of the following errors. Under some
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conditions, <em>value</em> could indicate an error other than those listed
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here.<br>
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<table cellpadding="5">
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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">The value specified for the argument is not correct.
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<p>A function was passed incorrect argument values, or an operation was attempted
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on an object and the operation specified is not supported for that type of
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object.</p>
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<p>An argument value is not valid, out of range, or NULL.</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>[EPERM]</em></td>
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<td align="left" valign="top">Operation not permitted.
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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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</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>[ESRCH]</em></td>
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<td align="left" valign="top">No item could be found that matches the specified
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value.</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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</table>
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<br>
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<br>
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<h3>Usage Notes</h3>
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<p>The <strong>Qp0wChkPid()</strong> function provides an i5/OS-specific way
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to obtain the process table information for the specified process.</p>
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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=
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"unix13.htm">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>qp0wpid.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>The <<strong>signal.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="getpid.htm">getpid()</a>--Get Process ID<br>
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<br>
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</li>
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<li><a href="getppid.htm">getppid()</a>--Get Process ID of Parent Process<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<br>
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<br>
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</li>
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<li><a href="qgtpid.htm">Qp0wGetPid()</a>--Get Process ID<br>
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<br>
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</li>
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<li><a href="qgtppid.htm">Qp0wGetPPid()</a>--Get Process ID of Parent
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Process<br>
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<br>
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</li>
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<li><a href="wait.htm">wait()</a>--Wait for Child Process to End</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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