179 lines
4.7 KiB
HTML
179 lines
4.7 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>_MEMCPY_WT()--Copy Memory With Tags for i5/OS PASE</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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<!-- Created by V2DCIJB on 23 Nov 1999 -->
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<!-- Edited by Kersten Jan 02 -->
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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>_MEMCPY_WT()--Copy Memory With Tags for i5/OS PASE</h2>
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<div class="box" style="width: 70%;">
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<br>
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Syntax
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<pre>
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#include <as400_protos.h>
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void* _MEMCPY_WT(void *target,
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const void *source,
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size_t length);
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void _MEMCPY_WT2(const ILEpointer *target,
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const ILEpointer *source,
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size_t length);
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</pre>
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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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Library: Standard C Library (libc.a)<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><strong>Note:</strong> These functions can only be used in an i5/OS PASE
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program. See <a href="../rzalf/rzalfintro.htm">i5/OS PASE</a> for more
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information about creating i5/OS PASE programs.</p>
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<p>The _MEMCPY_WT() and _MEMCPY_WT2() functions copy memory without destroying
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16-byte tagged pointers.</p>
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<p>Standard memory copy functions such as memcpy never produce a usable tagged
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pointer in the target memory. _MEMCPY_WT and _MEMCPY_WT2 copy memory in a way
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that preserves the integrity of any complete (16-byte) tagged pointers copied,
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as long as the source and target have the same alignment with respect to a
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16-byte boundary.</p>
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<br>
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<h3>Parameters</h3>
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<dl>
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<dt><strong>target</strong></dt>
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<dd>(Output) Pointer to target memory. For _MEMCPY_WT, target is the i5/OS
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PASE address of the target memory. For _MEMCPY_WT2, target is the 16-byte
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aligned address of a tagged space pointer to the target memory.<br>
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<br>
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</dd>
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<dt><strong>source</strong></dt>
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<dd>(Input) Pointer to source memory. For _MEMCPY_WT, source is the i5/OS PASE
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address of the source memory. For _MEMCPY_WT2, source is the 16-byte aligned
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address of a tagged space pointer to the source memory.<br>
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<br>
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</dd>
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<dt><strong>length</strong></dt>
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<dd>(Input) Specifies the number of bytes to copy between the source and
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target.<br>
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</dd>
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</dl>
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<br>
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<h3>Authorities</h3>
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<p>_MEMCPY_WT and _MEMCPY_WT2 require no authority.</p>
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<br>
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<h3>Return Value</h3>
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<p>_MEMCPY_WT returns the target memory address. _MEMCPY_WT2 returns no
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function result.</p>
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<br>
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<h3>Error Conditions</h3>
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<p>Any error is reported with an i5/OS exception message that the system
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converts to an i5/OS PASE signal. See <a href="pase_signals.htm">i5/OS PASE
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Signal Handling</a> for information about handling i5/OS exceptions.</p>
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<br>
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<h3>Usage Notes</h3>
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<ol>
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<li>_MEMCPY_WT only copies between memory areas in the i5/OS PASE address
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space. _MEMCPY_WT2 can copy between any memory areas addressable through tagged
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space pointers, which need not be in the i5/OS PASE address space.<br>
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<br>
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</li>
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<li>Memory is copied without error if the source and target do not have the
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same alignment with respect to a 16-byte boundary or if only part of a tagged
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pointer is copied, but the target will not contain a usable tagged pointer.<br>
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<br>
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</li>
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<li>_MEMCPY_WT and _MEMCPY_WT2 are implemented with kernel system calls, so
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they generally run slower than memcpy.<br>
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<br>
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</li>
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</ol>
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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="pase__cvtspp.htm">_CVTSPP()--Convert Space Pointer for i5/OS
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PASE</a></li>
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<li><a href="pase__setspp.htm">_SETSPP()--Set Space Pointer for i5/OS
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PASE</a></li>
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<li><a href="pase__setsppm.htm">_SETSPPM()--Set Multiple Space Pointers for i5/OS
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PASE</a></li>
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</ul>
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<br>
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<hr>
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API introduced: V4R5
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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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"pase1.htm">i5/OS PASE APIs</a> | <a href="aplist.htm">APIs by category</a>
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</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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