216 lines
6.7 KiB
HTML
216 lines
6.7 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>QlgReadlink()--Read Value of Symbolic Link (using NLS-enabled path
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name)</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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<!-- Created by Yvonne Griffin for V5R1-->
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<!-- Change History: -->
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<!-- 011022 JTROUS Changes from API Review 1, V5R2 -->
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<!-- 040421 JTROUS Changes from API Review 1, V5R4 -->
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<!-- This file has undergone html cleanup June 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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<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>QlgReadlink()--Read Value of Symbolic Link (using NLS-enabled path
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name)</h2>
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<div class="box" style="width: 65%;">
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<br>
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Syntax<br>
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<pre>
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#include <unistd.h>
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int QlgReadlink(Qlg_Path_Name_T <em>*path</em>, Qlg_Path_Name_T <em>*buf</em>,
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size_t <em>bufsiz</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: Conditional; see Usage Notes for <a href="readlink.htm">
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readlink()</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>QlgReadlink()</strong> function, like the <strong>
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readlink()</strong> function, places the contents of the symbolic link <em>
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path</em> in the buffer <em>buf</em>. The difference is that the <strong>
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QlgReadlink()</strong> function uses pointers to Qlg_Path_Name_T structures,
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while <strong>readlink()</strong> uses pointers to character strings.</p>
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<p>Limited information on the <em>path</em> parameter, the <em>buf</em>
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parameter, and the <em>size</em> parameter is provided here. For more
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information on these parameters and for a discussion on authorities required,
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return values, and related information, see <a href="readlink.htm">
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readlink()</a>--Read Value of Symbolic Link.</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>path</em></strong></dt>
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<dd>(Input) A pointer to a Qlg_Path_Name_T structure that contains a path name
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or a pointer to a path name of the symbolic link. For more information on the
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Qlg_Path_Name_T structure, see <a href="../apiref/pns.htm">Path name format</a>.<br>
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<br>
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</dd>
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<dt><strong><em>buf</em></strong></dt>
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<dd>(Output) A pointer to the area in which the contents of the link should be
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stored. For more information on the Qlg_Path_Name_T structure, see <a href=
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"../apiref/pns.htm">Path name format</a>.<br>
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<br>
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</dd>
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<dt><strong><em>bufsiz</em></strong></dt>
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<dd>(Input) The size of <em>buf</em> in bytes.</dd>
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</dl>
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<br>
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<h3>Related Information</h3>
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<ul>
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<li><a href="readlink.htm">readlink()</a>--Read Value of Symbolic Link
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</li>
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<li><a href="lstatu.htm">QlgLstat()</a>--Get File or Link Information (using
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NLS-enabled path name)
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</li>
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<li><a href="statu.htm">QlgStat()</a>--Get File Information (using NLS-enabled
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path name)
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</li>
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<li><a href="symlinku.htm">QlgSymlink()</a>--Make Symbolic Link (using
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NLS-enabled path name)
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</li>
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<li><a href="qp0lunlk.htm">Qp0lUnlink()</a>--Remove Link to File</li>
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</ul>
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<br>
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<h3>Example</h3>
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<p>See <a href="../apiref/aboutapis.htm#codedisclaimer">Code disclaimer information</a>
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for information pertaining to code examples.</p>
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<p>The following example uses <strong>QlgReadlink()</strong>:</p>
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<pre>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <Qp0lstdi.h>
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main() {
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int file_descriptor;
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#define mypath_fn "readlink.file"
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#define mypath_sl "readlink.symlink"
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const char US_const[3]= "US";
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const char Language_const[4]="ENU";
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typedef struct pnstruct
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{
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Qlg_Path_Name_T qlg_struct;
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char pn[100]; /* This array size must be >= the length */
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/* of the path name or this must be a */
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/* pointer to the path name. */
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};
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struct pnstruct path_fn;
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struct pnstruct path_sl;
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struct pnstruct path_buf;
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/***************************************************************/
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/* Initialize Qlg_Path_Name_T parameters */
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/***************************************************************/
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memset((void*)path name_fn, 0x00, sizeof(struct pnstruct));
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path_fn.qlg_struct.CCSID = 37;
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memcpy(path_fn.qlg_struct.Country_ID,US_const,2);
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memcpy(path_fn.qlg_struct.Language_ID,Language_const,3);
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path_fn.qlg_struct.Path_Type = QLG_CHAR_SINGLE;
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path_fn.qlg_struct.Path_Length = sizeof(mypath_fn)-1;
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path_fn.qlg_struct.Path_Name_Delimiter[0] = '/';
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memcpy(path_fn.pn,mypath_fn,sizeof(mypath_fn)-1);
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memset((void*)path name_sl, 0x00, sizeof(struct pnstruct));
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path_sl.qlg_struct.CCSID = 37;
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memcpy(path_sl.qlg_struct.Country_ID,US_const,2);
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memcpy(path_sl.qlg_struct.Language_ID,Language_const,3);
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path_sl.qlg_struct.Path_Type = QLG_CHAR_SINGLE;
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path_sl.qlg_struct.Path_Length = sizeof(mypath_sl)-1;
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path_sl.qlg_struct.Path_Name_Delimiter[0] = '/';
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memcpy(path_sl.pn,mypath_sl,sizeof(mypath_sl)-1);
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if ((file_descriptor = QlgCreat((Qlg_Path_Name_T *)path name_fn, S_IWUSR)) < 0)
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perror("QlgCreat() error");
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else {
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close(file_descriptor);
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if (QlgSymlink((Qlg_Path_Name_T *)path name_fn,
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(Qlg_Path_Name_T *)path name_sl) != 0)
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perror("QlgSymlink() error");
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else {
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if (QlgReadlink((Qlg_Path_Name_T *)path name_sl,
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(Qlg_Path_Name_T *)path name_buf,
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sizeof(path_buf)) < 0)
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perror("QlgReadlink() error");
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else printf("QlgReadlink() returned '%s' for '%s'\n",
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path name_buf.pn,
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path name_sl.pn);
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QlgUnlink((Qlg_Path_Name_T *)path name_sl);
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}
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QlgUnlink((Qlg_Path_Name_T *)path name_fn);
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}
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}
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</pre>
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<p><strong>Output:</strong></p>
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<pre>
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QlgReadlink() returned 'readlink.file' for 'readlink.symlink'
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</pre>
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<hr>
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API introduced: V5R1
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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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