230 lines
6.9 KiB
HTML
230 lines
6.9 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>Exit Program for Change File Pointer (QHFCHGFP) API</title>
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<!--File Edited November 2001 -->
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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"></script>
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<h2>Exit Program for Change File Pointer (QHFCHGFP) API</h2>
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<div class="box" style="width: 65%;">
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<br>
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Required Parameter Group:<br>
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<!-- iddvc RMBR -->
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<br>
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<table width="100%">
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<tr>
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<td align="center" valign="top" width="10%">1</td>
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<td align="left" valign="top" width="40%">Operation (CHGFP)</td>
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<td align="left" valign="top" width="20%">Input</td>
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<td align="left" valign="top" width="30%">Char(5)</td>
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</tr>
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<tr>
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<td align="center" valign="top">2</td>
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<td align="left" valign="top">File system job handle</td>
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<td align="left" valign="top">Input</td>
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<td align="left" valign="top">Char(16)</td>
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</tr>
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<tr>
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<td align="center" valign="top">3</td>
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<td align="left" valign="top">Open file handle</td>
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<td align="left" valign="top">Input</td>
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<td align="left" valign="top">Char(16)</td>
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</tr>
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<tr>
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<td align="center" valign="top">4</td>
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<td align="left" valign="top">Move information</td>
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<td align="left" valign="top">Input</td>
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<td align="left" valign="top">Char(6)</td>
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</tr>
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<tr>
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<td align="center" valign="top">5</td>
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<td align="left" valign="top">Distance to move</td>
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<td align="left" valign="top">Input</td>
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<td align="left" valign="top">Binary(4)</td>
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</tr>
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<tr>
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<td align="center" valign="top">6</td>
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<td align="left" valign="top">New offset</td>
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<td align="left" valign="top">Output</td>
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<td align="left" valign="top">Binary(4) Unsigned</td>
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</tr>
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</table>
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<br>
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</div>
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<p>Before applications can use the Change File Pointer (QHFCHGFP) API with your file system, you must:</p>
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<ol>
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<li>Write an exit program that performs the change file pointer operation on behalf of the API. For a detailed description of the API and its calling parameters, see <a href="qhfchgfp.htm">Change File Pointer (QHFCHGFP) API</a>.<br><br></li>
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<li>Give the exit program's name when you register the file system with the Register File System (QHFRGFS) API.</li>
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</ol>
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<p>After that, when an application calls the QHFCHGFP API, the API calls your exit program and passes it the parameters specified by the application. Your exit program performs the work and returns any data to the API. The API passes the data back to the calling application.</p>
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<br>
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<!-- Please NOTE: DO NOT DELETE THIS SECTION if this API has no authorities and locks. -->
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<!-- Instead, use the commented out coding below to indicate NONE. -->
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<h3>Authorities and Locks</h3>
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<!-- Use this if there are no authorities and locks. -->
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<p>None.</p>
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<br>
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<h3>Required Parameter Group</h3>
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<p>The following shows the input parameters that the API passes to your exit program and the output parameter that the exit program must pass back to the API:</p>
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<dl>
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<dt><strong>Operation (CHGFP)</strong></dt>
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<dd>INPUT; CHAR(5)
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<p>The abbreviation for the operation being performed (CHGFP).</p></dd>
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<dt><strong>File system job handle</strong></dt>
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<dd>INPUT; CHAR(16)
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<p>The work area or job identifier for use by the file system.</p></dd>
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</dl>
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<p>The following parameters are the same as the parameters for the API.</p>
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<dl>
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<dt><strong>Open file handle</strong></dt>
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<dd>INPUT; CHAR(16)<br><br></dd>
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<dt><strong>Move information</strong></dt>
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<dd>INPUT; CHAR(6)<br><br></dd>
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<dt><strong>Distance to move</strong></dt>
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<dd>INPUT; BINARY(4)<br><br></dd>
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<dt><strong>New offset</strong></dt>
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<dd>OUTPUT; BINARY(4) UNSIGNED</dd>
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</dl>
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<br>
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<h3>API Functions</h3>
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<p>The QHFCHGFP API performs the standard functions described in <a href="hfs3d.htm#HDRSTDAPI">Standard HFS API Functions</a>.</p>
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<br>
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<h3>Exit Program Requirements</h3>
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<p>You must create an exit program that performs the standard functions described in <a href="hfs3d.htm#HDRSTDFS">Standard HFS Exit Program Requirements</a> and these additional functions:</p>
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<ul>
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<li>Checks for an attempt to set the file pointer to a negative position (that is, before the start of the file) or a position beyond the maximum value allowed in a 4-byte unsigned binary number, and signals an error if either occurs.<br><br></li>
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<li>Moves the file pointer the specified distance from the specified starting location, and records the file pointer's new offset value.</li>
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</ul>
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<br>
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<h3>Error Messages for Exit Program Use</h3>
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<p>This section lists the messages that the exit program can return to the API.</p>
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<table cellpadding="3">
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<!-- cols="15 85" -->
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<tr>
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<th align="left" valign="top">Message ID</th>
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<th align="left" valign="top">Error Message Text</th>
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</tr>
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<tr>
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<td align="left" valign="top">CPF1F2D E</td>
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<td valign="top">File pointer position not valid.</td>
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</tr>
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<tr>
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<td align="left" valign="top">CPF1F2E E</td>
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<td valign="top">Range of bytes in file in use.</td>
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</tr>
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<tr>
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<td align="left" valign="top">CPF1F28 E</td>
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<td valign="top">Damaged file.</td>
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</tr>
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<tr>
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<td align="left" valign="top">CPF1F4E E</td>
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<td valign="top">Move information value not valid.</td>
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</tr>
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<tr>
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<td align="left" valign="top">CPF1F4F E</td>
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<td valign="top">Distance to move value not valid.</td>
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</tr>
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<tr>
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<td align="left" valign="top">CPF1F41 E</td>
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<td valign="top">Severe error occurred while addressing parameter list.</td>
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</tr>
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<tr>
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<td align="left" valign="top">CPF1F62 E</td>
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<td valign="top">Requested function failed.</td>
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</tr>
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<tr>
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<td align="left" valign="top">CPF1F66 E</td>
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<td valign="top">Storage needed exceeds maximum limit for user profile &1.</td>
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</tr>
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<tr>
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<td align="left" valign="top">CPF1F71 E</td>
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<td valign="top"> Exception specific to file system occurred.</td>
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</tr>
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<tr>
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<td align="left" valign="top">CPF1F73 E</td>
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<td valign="top">Not authorized to use command.</td>
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</tr>
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<tr>
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<td align="left" valign="top">CPF1F74 E</td>
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<td valign="top">Not authorized to object.</td>
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</tr>
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<tr>
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<td align="left" valign="top">CPF1F77 E</td>
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<td valign="top">Severe parameter error occurred on call to file system.</td>
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</tr>
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</table>
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<br>
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<hr>
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Exit Program Introduced: V2R1
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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
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href="hfs1.htm">Hierarchical File System APIs</a> |
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<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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