92 lines
6.1 KiB
HTML
92 lines
6.1 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html lang="en-us" xml:lang="en-us">
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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="security" content="public" />
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<meta name="Robots" content="index,follow" />
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Security system values: Allow use of shared or mapped memory with write capability" />
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<meta name="abstract" content="Specifies whether users are allowed to use shared memory or mapped memory stream files or not. (QSHRMEMCTL)" />
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<meta name="description" content="Specifies whether users are allowed to use shared memory or mapped memory stream files or not. (QSHRMEMCTL)" />
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<meta name="DC.Relation" scheme="URI" content="rzakzsecurityoverview.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzakzlocksecurity.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzakzfinder.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="rzakzqshrmemctl" />
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<meta name="DC.Language" content="en-us" />
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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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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Security system values: Allow use of shared or mapped memory with write
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capability</title>
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</head>
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<body id="rzakzqshrmemctl"><a name="rzakzqshrmemctl"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Security system values: Allow use of shared or mapped memory with write
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capability</h1>
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<div><p>Specifies whether users are allowed to use shared memory or mapped
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memory stream files or not. (QSHRMEMCTL)</p>
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<p><span class="uicontrol">Allow use of shared or mapped memory with write capability</span>,
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also known as <span class="uicontrol">QSHRMEMCTL</span>, is a member of the security
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category of i5/OS™ system
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values. You can use this system value to specify whether shared or mapped
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memory with write capability can be used or not. To learn more, keep reading.</p>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" frame="border" border="1" rules="all"><thead align="left"><tr><th colspan="2" valign="top" class="firstcol" id="d0e31">Quick reference</th>
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</tr>
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</thead>
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<tbody><tr><th valign="top" class="firstcol" id="d0e35" headers="d0e31 ">Location</th>
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<td valign="top" headers="d0e35 d0e31 ">In iSeries™ Navigator,
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select your system, <span class="menucascade"><span class="uicontrol"></span> > <span class="uicontrol">Configuration
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and Service</span> > <span class="uicontrol">System Values</span> > <span class="uicontrol">Security</span> > <span class="uicontrol">Shared Memory</span></span></td>
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</tr>
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<tr><th valign="top" class="firstcol" id="d0e53" headers="d0e31 ">Special authority</th>
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<td valign="top" headers="d0e53 d0e31 ">All object (*ALLOBJ) and security administrator (*SECADM)</td>
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</tr>
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<tr><th valign="top" class="firstcol" id="d0e58" headers="d0e31 ">Default value</th>
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<td valign="top" headers="d0e58 d0e31 ">Selected - shared or mapped memory with write capability is allowed</td>
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</tr>
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<tr><th valign="top" class="firstcol" id="d0e63" headers="d0e31 ">Changes take effect</th>
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<td valign="top" headers="d0e63 d0e31 ">Immediately</td>
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</tr>
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<tr><th valign="top" class="firstcol" id="d0e68" headers="d0e31 ">Lockable</th>
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<td valign="top" headers="d0e68 d0e31 ">Yes Lock function of security-related system values<br /><img src="rzakz503.gif" alt="Lockable system value" /><br /> (Click for details)</td>
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</tr>
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</tbody>
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</table>
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</div>
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<div class="section"><h4 class="sectiontitle">What can I do with this system value?</h4><p>You may specify
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whether users are allowed (1) or are not allowed (0) to use shared memory
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or mapped memory stream files. You may select whether or not to allow access
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to shared memory, or use mapped memory stream files. By allowing this option,
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users can use shared-memory APIs (for example, shmat() - Shared Memory Attach
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API), and can use mapped memory objects that have stream files (for example,
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mmap() - Memory Map a File API). Allowing access to shared memory and mapped
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memory stream files is recommended for environments where pointers may be
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shared among programs, which may be running in different jobs. However, this
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setting is not recommended for environments with higher security requirements.</p>
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</div>
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<div class="section"><h4 class="sectiontitle">Where can I get more information about this system value?</h4><p>To
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learn more, go to the security system values overview topic. If you are looking
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for a specific system value or category of system values, try using the i5/OS system
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value finder.</p>
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</div>
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</div>
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<div><div class="relconcepts"><strong>Related concepts</strong><br />
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<div><a href="rzakzsecurityoverview.htm" title="Use i5/OS security system values to control object, user, and system security values.">System values: Security overview</a></div>
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<div><a href="rzakzlocksecurity.htm" title="Find information about how to lock and unlock system values. Only some system values can be locked. This will provide you with a description of the lock function, what system values can be locked, and how to lock and unlock them.">Lock function of security-related system values</a></div>
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</div>
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<div class="relinfo"><strong>Related information</strong><br />
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<div><a href="rzakzfinder.htm">System value finder</a></div>
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</div>
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</div>
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</body>
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</html>
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