354 lines
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354 lines
10 KiB
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<meta name="Copyright" content="Copyright (c) 2006 by IBM Corporation">
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<title>Qp0wChkChld()--Check Status for Child Processes</title>
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<a name="Top_Of_Page"></a>
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<h2>Qp0wChkChld()--Check Status for Child Processes</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 <qp0wpid.h>
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int Qp0wChkChld(QP0W_PID_Entries_T *<em>chldinfo</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>Qp0wChkChld()</strong> function returns the status and process
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table entry information for the child processes of the specified process
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ID.</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>*chldinfo</em></strong></dt>
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<dd>(I/O) A pointer to the <samp>QP0W_PID_Entry_T</samp> structure. This
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structure contains the process table entry information for the children
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processes identified by <em>pid</em>.</dd>
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</dl>
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<p>The structure <samp>QP0W_PID_Entry_T</samp> is defined in the <strong>
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<qp0wpid.h></strong> header file as follows:</p>
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<pre>
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typedef struct QP0W_PID_Entries_T {
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int entries_prov;
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int entries_could;
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int entries_return;
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pid_t pid;
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QP0W_PID_Data_T entry[1];
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} QP0W_PID_Entries_T;
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</pre>
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<p>The members of the <samp>QP0W_PID_Entry_T</samp> structure are as
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follows:</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>int entries_prov;</em></td>
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<td align="left" valign="top">(Input) The number of entries of type <samp>
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QP0W_PID_Data_T</samp> for which that the caller has allocated storage to
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contain the status and process table entry information.<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" nowrap><em>int entries_could;</em></td>
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<td align="left" valign="top">(Output) The number of entries of type <samp>
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QP0W_PID_Data_T</samp> that could be returned. If the <samp>
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entries_could</samp> value exceeds the <samp>entries_prov</samp> value, the
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<strong>Qp0wChkChld()</strong> function should be called again with sufficient
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storage to contain the number of entries returned in <samp>entries_could</samp>
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(<samp>entries_prov</samp> must be greater than or equal to <samp>
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entries_could</samp>).</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>int entries_return;</em></td>
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<td align="left" valign="top">(Output) The number of entries of type <samp>
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QP0W_PID_Data_T</samp> that were returned. If the <samp>entries_return</samp>
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value is less than the <samp>entries_prov</samp> value, the content of the
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excess number of entries provided is unchanged by <strong>
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Qp0wChkChld()</strong>.</td>
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</tr>
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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">(Input) The process ID of the process for which
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information about its child processes is to be returned.<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" nowrap><em>QP0W_PID_Data_T entry[1];</em></td>
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<td align="left" valign="top">(Output) The process table information for child
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processes. There is one <samp>QP0W_PID_Data_T</samp> structure entry for each
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child process, limited by the value of <samp>entries_prov</samp>.</td>
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</tr>
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</table>
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<p>The structure <samp>QP0W_PID_Data_T</samp> is defined in the <strong>
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<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="10 90" -->
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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.</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 <samp>
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ppid</samp> has a value of binary 1, there is no parent process associated with
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the process.</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.</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 <samp>
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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 its 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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</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 <samp>
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QP0W_PID_TERMINATED</samp>. Refer to the <strong>wait()</strong> function for a
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description of the exit status for a process.</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>Qp0wChkChld()</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>Qp0wChkChld()</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 <strong>
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Qp0wChkChld()</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>Qp0wChkChld()</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>Qp0wChkChld()</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>Qp0wChkChld()</strong> was not
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successful. The value returned indicates one of the following errors. Under
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some 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
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correct.
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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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</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>Qp0wChkChld()</strong> function provides an i5/OS-specific way
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to obtain the process table information for the child processes of the
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specified process.</p>
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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>qp0wpid.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>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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