665 lines
16 KiB
HTML
665 lines
16 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>readdir()--Read Directory Entry</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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<!-- file cleaned -->
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<!-- Unix2 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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<!-- Change History: -->
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<!-- 011022 JTROUS Changes from API Review 1, V5R2 -->
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<!-- 0206?? JET This file has undergone html cleanup -->
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<!-- 021021 VONBERGE: Add new qsys.lib usrprf auth reqs. D99381.1 -->
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<!-- 050407 JTROUS: fix enums, no change flag, V5R4 -->
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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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<a name="Top_Of_Page"></a>
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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>readdir()--Read Directory Entry</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 <dirent.h>
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struct dirent *readdir(DIR <em>*dirp</em>);
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</pre>
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Service Program Name: QP0LLIB1<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; see <a href="#USAGE_NOTES">Usage Notes</a>.<br>
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<!-- iddvc RMBR -->
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<br>
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</div>
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<p>The <strong>readdir()</strong> function returns a pointer to a <samp>
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dirent</samp> structure describing the next directory entry in the directory
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stream associated with <em>dirp</em>.</p>
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<p>A call to <strong>readdir()</strong> overwrites data produced by a previous
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call to <strong>readdir()</strong> on the same directory stream. Calls for
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different directory streams do not overwrite the data of each other.</p>
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<p>If the call to <strong>readdir()</strong> actually reads the directory, the
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access time of the directory is updated.</p>
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<p><strong>readdir()</strong> performs translation if necessary to convert the
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directory entry name into the CCSID (coded character set identifier) of the job
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at the time of the call to <strong>opendir()</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>dirp</em></strong></dt>
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<dd>(Input) A pointer to a <samp>DIR</samp> that refers to the open directory
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stream to be read. This pointer is returned by <strong>opendir()</strong> (see
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<a href="opendir.htm">opendir()</a>--Open Directory).
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<p>See <a href="readdiru.htm">QlgReaddir()</a>--Read Directory Entry for a
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description and an example of supplying the <em>dirp</em> in any CCSID, using a
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<samp>dirent_lg</samp> structure.</p>
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</dd>
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</dl>
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<p>A <samp>dirent</samp> structure has the following contents:</p>
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<table border>
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<tr>
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<td align="left" valign="top" width="15%">char</td>
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<td align="left" valign="top" width="15%">d_reserved1[16]</td>
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<td align="left" valign="top" width="70%">Reserved.</td>
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</tr>
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<tr>
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<td align="left" valign="top">unsigned int</td>
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<td align="left" valign="top">d_fileno_gen_id</td>
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<td align="left" valign="top">The generation ID associated with the file
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ID.</td>
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</tr>
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<tr>
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<td align="left" valign="top">ino_t</td>
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<td align="left" valign="top">d_fileno</td>
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<td align="left" valign="top">The file ID of the file. This number uniquely
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identifies the object within a file system.</td>
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</tr>
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<tr>
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<td align="left" valign="top">unsigned int</td>
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<td align="left" valign="top">d_reclen</td>
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<td align="left" valign="top">The length of the directory entry in bytes.</td>
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</tr>
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<tr>
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<td align="left" valign="top">int</td>
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<td align="left" valign="top">d_reserved3</td>
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<td align="left" valign="top">Reserved.</td>
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</tr>
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<tr>
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<td align="left" valign="top">char</td>
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<td align="left" valign="top">d_reserved4[6]</td>
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<td align="left" valign="top">Reserved.</td>
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</tr>
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<tr>
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<td align="left" valign="top">char</td>
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<td align="left" valign="top">d_reserved5[2]</td>
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<td align="left" valign="top">Reserved.</td>
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</tr>
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<tr>
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<td align="left" valign="top">qlg_nls_t</td>
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<td align="left" valign="top">d_nlsinfo</td>
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<td align="left" valign="top">National language information about d_name. The
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following fields are defined:
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<dl>
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<dt><em>int ccsid</em></dt>
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<dd>CCSID of the characters in the d_name field.</dd>
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<dt><em>char country_id[2]</em></dt>
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<dd>Country or region identifier associated with the d_name field.</dd>
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<dt><em>char language_id[3]</em></dt>
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<dd>Language identifier associated with the d_name field.</dd>
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<dt><em>char nls_reserved[3]</em></dt>
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<dd>Reserved.</dd>
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</dl>
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</td>
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</tr>
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<tr>
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<td align="left" valign="top">unsigned int</td>
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<td align="left" valign="top">d_namelen</td>
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<td align="left" valign="top">The length of the name in bytes, excluding the
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null terminator.</td>
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</tr>
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<tr>
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<td align="left" valign="top">char</td>
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<td align="left" valign="top">d_name[640]</td>
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<td align="left" valign="top">A string that gives the name of a file in the
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directory. This string ends in a terminating null, and has a maximum length of
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{NAME_MAX} bytes, not including the terminating NULL (see <a href=
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"pathconf.htm">pathconf()--Get Configurable Path Name Variables</a>).</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>No authorization is required. Authorization is verified during <strong>
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opendir()</strong>.</p>
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<p><strong>Note:</strong>
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When reading the contents of the /QSYS.LIB directory, user profile (*USRPRF)
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objects to which the caller does not have any authority (i.e., *EXCLUDE)
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will not be returned from <strong>readdir()</strong>.</p>
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<br>
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<h3>Return Value</h3>
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<dl compact>
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<dt><em>value</em></dt>
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<dd><strong>readdir()</strong> was successful. The value returned is a pointer
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to a <samp>dirent</samp> structure describing the next directory entry in the
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directory stream.</dd>
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<dt><em>NULL pointer</em></dt>
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<dd>One of the following has occurred:<br>
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<br>
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<ul>
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<li><strong>readdir()</strong> reached the end of the directory stream. The
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<em>errno</em> global variable is not changed.</li>
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<li><strong>readdir()</strong> was not successful. The <em>errno</em> is
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set.</li>
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</ul>
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</dd>
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</dl>
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<br>
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<h3>Error Conditions</h3>
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<p>If <strong>readdir()</strong> is not successful, <em>errno</em> usually
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indicates one of the following errors. Under some conditions, <em>errno</em>
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could indicate an error other than those listed here.</p>
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<table cellpadding="5">
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<!-- cols="25 75" -->
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<tr>
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<th align="left" valign="bottom">Error condition</th>
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<th align="left" valign="bottom">Additional information</th>
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</tr>
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<tr>
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<td align="left" valign="top">
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<em>[<a href="unix14.htm#EACCES">EACCES</a>]</em></td>
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<td align="left" valign="top">
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<p>If you are accessing a remote file through the Network File System, update
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operations to file permissions at the server are not reflected at the client
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until updates to data that is stored locally by the Network File System take
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place. (Several options on the Add Mounted File System (ADDMFS) command
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determine the time between refresh operations of local data.) Access to a
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remote file may also fail due to different mappings of user IDs (UID) or group
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IDs (GID) on the local and remote systems.</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">
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<em>[<a href="unix14.htm#EAGAIN">EAGAIN</a>]</em></td>
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<td align="left" valign="top">
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</td>
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</tr>
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<tr>
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<td align="left" valign="top">
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<em>[<a href="unix14.htm#EBADFID">EBADFID</a>]</em></td>
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<td align="left" valign="top">
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</td>
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</tr>
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<tr>
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<td align="left" valign="top">
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<em>[<a href="unix14.htm#EBADF">EBADF</a>]</em></td>
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<td align="left" valign="top">
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</td>
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</tr>
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<tr>
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<td align="left" valign="top">
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<em>[<a href="unix14.htm#EBUSY">EBUSY</a>]</em></td>
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<td align="left" valign="top">
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</td>
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</tr>
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<tr>
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<td align="left" valign="top">
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<em>[<a href="unix14.htm#EDAMAGE">EDAMAGE</a>]</em></td>
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<td align="left" valign="top">
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</td>
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</tr>
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<tr>
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<td align="left" valign="top">
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<em>[<a href="unix14.htm#EFAULT">EFAULT</a>]</em></td>
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<td align="left" valign="top">
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</td>
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</tr>
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<tr>
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<td align="left" valign="top">
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<em>[<a href="unix14.htm#EINVAL">EINVAL</a>]</em></td>
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<td align="left" valign="top">
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</td>
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</tr>
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<tr>
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<td align="left" valign="top">
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<em>[<a href="unix14.htm#EIO">EIO</a>]</em></td>
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<td align="left" valign="top">
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</td>
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</tr>
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<tr>
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<td align="left" valign="top">
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<em>[<a href="unix14.htm#ENOSPC">ENOSPC</a>]</em></td>
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<td align="left" valign="top">
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</td>
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</tr>
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<tr>
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<td align="left" valign="top">
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<em>[<a href="unix14.htm#ENOTAVAIL">ENOTAVAIL</a>]</em></td>
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<td align="left" valign="top">
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</td>
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</tr>
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<tr>
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<td align="left" valign="top">
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<em>[<a href="unix14.htm#ENOTSAFE">ENOTSAFE</a>]</em></td>
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<td align="left" valign="top">
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</td>
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</tr>
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<tr>
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<td align="left" valign="top">
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<em>[<a href="unix14.htm#ESTALE">ESTALE</a>]</em></td>
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<td align="left" valign="top">
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<p>If you are accessing a remote file through the Network File System, the file
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may have been deleted at the server.</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">
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<em>[<a href="unix14.htm#EUNKNOWN">EUNKNOWN</a>]</em></td>
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<td align="left" valign="top">
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</td>
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</tr>
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</table>
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<p>If interaction with a file server is required to access the object, <em>
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errno</em> could indicate one of the following errors:</p>
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<table cellpadding="5">
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<!-- cols="25 75" -->
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<tr>
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<th align="left" valign="bottom">Error condition</th>
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<th align="left" valign="bottom">Additional information</th>
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</tr>
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<tr>
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<td align="left" valign="top">
|
||
|
|
<em>[<a href="unix14.htm#EADDRNOTAVAIL">EADDRNOTAVAIL</a>]</em></td>
|
||
|
|
|
||
|
|
<td align="left" valign="top">
|
||
|
|
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
|
||
|
|
|
||
|
|
<tr>
|
||
|
|
<td align="left" valign="top">
|
||
|
|
<em>[<a href="unix14.htm#ECONNABORTED">ECONNABORTED</a>]</em></td>
|
||
|
|
|
||
|
|
<td align="left" valign="top">
|
||
|
|
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
|
||
|
|
<tr>
|
||
|
|
<td align="left" valign="top">
|
||
|
|
<em>[<a href="unix14.htm#ECONNREFUSED">ECONNREFUSED</a>]</em></td>
|
||
|
|
|
||
|
|
<td align="left" valign="top">
|
||
|
|
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
|
||
|
|
<tr>
|
||
|
|
<td align="left" valign="top">
|
||
|
|
<em>[<a href="unix14.htm#ECONNRESET">ECONNRESET</a>]</em></td>
|
||
|
|
|
||
|
|
<td align="left" valign="top">
|
||
|
|
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
|
||
|
|
<tr>
|
||
|
|
<td align="left" valign="top">
|
||
|
|
<em>[<a href="unix14.htm#EHOSTDOWN">EHOSTDOWN</a>]</em></td>
|
||
|
|
|
||
|
|
<td align="left" valign="top">
|
||
|
|
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
|
||
|
|
<tr>
|
||
|
|
<td align="left" valign="top">
|
||
|
|
<em>[<a href="unix14.htm#EHOSTUNREACH">EHOSTUNREACH</a>]</em></td>
|
||
|
|
|
||
|
|
<td align="left" valign="top">
|
||
|
|
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
|
||
|
|
<tr>
|
||
|
|
<td align="left" valign="top">
|
||
|
|
<em>[<a href="unix14.htm#ENETDOWN">ENETDOWN</a>]</em></td>
|
||
|
|
|
||
|
|
<td align="left" valign="top">
|
||
|
|
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
|
||
|
|
<tr>
|
||
|
|
<td align="left" valign="top">
|
||
|
|
<em>[<a href="unix14.htm#ENETRESET">ENETRESET</a>]</em></td>
|
||
|
|
|
||
|
|
<td align="left" valign="top">
|
||
|
|
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
|
||
|
|
<tr>
|
||
|
|
<td align="left" valign="top">
|
||
|
|
<em>[<a href="unix14.htm#ENETUNREACH">ENETUNREACH</a>]</em></td>
|
||
|
|
|
||
|
|
<td align="left" valign="top">
|
||
|
|
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
|
||
|
|
|
||
|
|
<tr>
|
||
|
|
<td align="left" valign="top">
|
||
|
|
<em>[<a href="unix14.htm#ESTALE">ESTALE</a>]</em></td>
|
||
|
|
|
||
|
|
<td align="left" valign="top">
|
||
|
|
<p>If you are accessing a remote file through the Network File System, the file
|
||
|
|
may have been deleted at the server.</p>
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
|
||
|
|
<tr>
|
||
|
|
<td align="left" valign="top">
|
||
|
|
<em>[<a href="unix14.htm#ETIMEDOUT">ETIMEDOUT</a>]</em></td>
|
||
|
|
|
||
|
|
<td align="left" valign="top">
|
||
|
|
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
|
||
|
|
<tr>
|
||
|
|
<td align="left" valign="top">
|
||
|
|
<em>[<a href="unix14.htm#EUNATCH">EUNATCH</a>]</em></td>
|
||
|
|
|
||
|
|
<td align="left" valign="top">
|
||
|
|
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
|
||
|
|
<br>
|
||
|
|
<br>
|
||
|
|
<h3>Error Messages</h3>
|
||
|
|
|
||
|
|
<p>The following messages may be sent from this function:</p>
|
||
|
|
|
||
|
|
<table width="100%">
|
||
|
|
<tr>
|
||
|
|
<th align="left" valign="top">Message ID</th>
|
||
|
|
<th align="left" valign="top">Error Message Text</th>
|
||
|
|
</tr>
|
||
|
|
|
||
|
|
<tr>
|
||
|
|
<td width="15%" valign="top">CPE3418 E</td>
|
||
|
|
<td width="85%" valign="top">Possible APAR condition or hardware failure.</td>
|
||
|
|
</tr>
|
||
|
|
|
||
|
|
<tr>
|
||
|
|
<td valign="top">CPFA0D4 E</td>
|
||
|
|
<td valign="top">File system error occurred. Error number &1.</td>
|
||
|
|
</tr>
|
||
|
|
|
||
|
|
<tr>
|
||
|
|
<td valign="top">CPF3CF2 E</td>
|
||
|
|
<td valign="top">Error(s) occurred during running of &1 API.</td>
|
||
|
|
</tr>
|
||
|
|
|
||
|
|
<tr>
|
||
|
|
<td valign="top">CPF9872 E</td>
|
||
|
|
<td valign="top">Program or service program &1 in library &2 ended.
|
||
|
|
Reason code &3.</td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
<br>
|
||
|
|
<br>
|
||
|
|
<h3><a name="USAGE_NOTES">Usage Notes</a></h3>
|
||
|
|
|
||
|
|
<ol type="1">
|
||
|
|
<li>The <strong>readdir_r()</strong> API should be used to read a directory
|
||
|
|
when running in a multithreaded job.<br><br>
|
||
|
|
</li>
|
||
|
|
|
||
|
|
<li>Save the data from <strong>readdir()</strong>, if required, before calling
|
||
|
|
<strong>closedir()</strong>, because <strong>closedir()</strong> frees the
|
||
|
|
data.<br><br>
|
||
|
|
</li>
|
||
|
|
|
||
|
|
<li>If the <em>dirp</em> argument passed to <strong>readdir()</strong> does not
|
||
|
|
refer to an open directory stream, <strong>readdir()</strong> returns the
|
||
|
|
[EBADF] error.<br><br>
|
||
|
|
</li>
|
||
|
|
|
||
|
|
<li><strong>readdir()</strong> buffers multiple directory entries to improve
|
||
|
|
performance. This means the directory is not actually read on each call to
|
||
|
|
<strong>readdir()</strong>. As a result, files that are added to the directory
|
||
|
|
after <strong>opendir()</strong> or <strong>rewinddir()</strong> may not be
|
||
|
|
returned on calls to <strong>readdir()</strong>, and files that are removed may
|
||
|
|
still be returned on calls to <strong>readdir()</strong>.<br><br>
|
||
|
|
</li>
|
||
|
|
|
||
|
|
<li><strong>readdir()</strong> also returns directory entries for dot (.) and
|
||
|
|
dot-dot (..) subdirectories.<br><br>
|
||
|
|
</li>
|
||
|
|
|
||
|
|
<li>QSYS.LIB and Independent ASP QSYS.LIB File System Differences
|
||
|
|
|
||
|
|
<p>Calls to <strong>readdir()</strong> that update the access time of the
|
||
|
|
directory use the normal rules that apply to libraries and database files. At
|
||
|
|
most, the access time is updated once per day.</p>
|
||
|
|
|
||
|
|
</li>
|
||
|
|
|
||
|
|
<li>QDLS File System Differences
|
||
|
|
|
||
|
|
<p>The access time of the directory is updated on <strong>opendir()</strong>.
|
||
|
|
The access time is not affected by <strong>readdir()</strong>.</p>
|
||
|
|
|
||
|
|
<p>When objects in QDLS are accessed, the country or region ID and language ID
|
||
|
|
of the directory entry name are always set to the country or region ID and
|
||
|
|
language ID of the system.</p>
|
||
|
|
|
||
|
|
<p>When a <strong>readdir()</strong> operation specifies the /QDLS directory,
|
||
|
|
the user must have *USE authority to each child object of the /QDLS directory
|
||
|
|
(that is, *USE authority to each object immediately below QDLS in the directory
|
||
|
|
hierarchy). A directory entry is returned only for those objects for which the
|
||
|
|
user has *USE authority. If the <strong>readdir()</strong> operation specifies
|
||
|
|
a directory below QDLS, a directory entry is returned for all objects, even if
|
||
|
|
the user does not have *USE authority for some of the objects.</p>
|
||
|
|
|
||
|
|
</li>
|
||
|
|
|
||
|
|
<li>QOPT File System Differences
|
||
|
|
|
||
|
|
<p>The access time of the directory is not updated on a <strong>
|
||
|
|
readdir()</strong> operation.</p>
|
||
|
|
</li>
|
||
|
|
</ol>
|
||
|
|
|
||
|
|
<br>
|
||
|
|
<h3>Related Information</h3>
|
||
|
|
|
||
|
|
<ul>
|
||
|
|
<li>The <<strong>sys/types.h</strong>> file (see <a href="unix13.htm">
|
||
|
|
Header Files for UNIX-Type Functions</a>)</li>
|
||
|
|
|
||
|
|
<li>The <<strong>dirent.h</strong>> file see <a href="unix13.htm">Header
|
||
|
|
Files for UNIX-Type Functions</a>)</li>
|
||
|
|
|
||
|
|
<li><a href="opendir.htm">opendir()</a>--Open Directory</li>
|
||
|
|
|
||
|
|
<li><a href="readdiru.htm">QlgReaddir()</a>--Read Directory Entry</li>
|
||
|
|
|
||
|
|
<li><a href="rewinddi.htm">rewinddir()</a>--Reset Directory Stream to
|
||
|
|
Beginning</li>
|
||
|
|
|
||
|
|
<li><a href="closedir.htm">closedir()</a>--Close Directory</li>
|
||
|
|
|
||
|
|
<li><a href="pathconf.htm">pathconf()-</a>-Get Configurable Path Name
|
||
|
|
Variables</li>
|
||
|
|
</ul>
|
||
|
|
|
||
|
|
<br>
|
||
|
|
<h3>Example</h3>
|
||
|
|
|
||
|
|
<p>See <a href="../apiref/aboutapis.htm#codedisclaimer">Code disclaimer information</a>
|
||
|
|
for information pertaining to code examples.</p>
|
||
|
|
|
||
|
|
<p>The following example reads the contents of the "root" (/) directory:</p>
|
||
|
|
|
||
|
|
<pre>
|
||
|
|
#include <sys/types.h>
|
||
|
|
#include <dirent.h>
|
||
|
|
#include <errno.h>
|
||
|
|
#include <stdio.h>
|
||
|
|
|
||
|
|
main() {
|
||
|
|
DIR *dir;
|
||
|
|
struct dirent *entry;
|
||
|
|
|
||
|
|
if ((dir = opendir("/")) == NULL)
|
||
|
|
perror("opendir() error");
|
||
|
|
else {
|
||
|
|
puts("contents of root:");
|
||
|
|
while ((entry = readdir(dir)) != NULL)
|
||
|
|
printf(" %s\n", entry->d_name);
|
||
|
|
closedir(dir);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
</pre>
|
||
|
|
|
||
|
|
<p><strong>Output:</strong></p>
|
||
|
|
|
||
|
|
<pre>
|
||
|
|
contents of root:
|
||
|
|
.
|
||
|
|
..
|
||
|
|
QSYS.LIB
|
||
|
|
QDLS
|
||
|
|
QOpenSys
|
||
|
|
QOPT
|
||
|
|
home
|
||
|
|
</pre>
|
||
|
|
|
||
|
|
<br>
|
||
|
|
<hr>
|
||
|
|
API introduced: V3R1
|
||
|
|
|
||
|
|
<hr>
|
||
|
|
<center>
|
||
|
|
<table cellpadding="2" cellspacing="2">
|
||
|
|
<tr align="center">
|
||
|
|
<td valign="middle" align="center"><a href="#Top_Of_Page">Top</a> | <a href=
|
||
|
|
"unix.htm">UNIX-Type APIs</a> | <a href="aplist.htm">APIs by category</a></td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
</center>
|
||
|
|
</body>
|
||
|
|
</html>
|
||
|
|
|