ibm-information-center/dist/eclipse/plugins/i5OS.ic.rzakz_5.4.0.1/rzakzqshrmemctl.htm

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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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<h1 class="topictitle1">Security system values: Allow use of shared or mapped memory with write
capability</h1>
<div><p>Specifies whether users are allowed to use shared memory or mapped
memory stream files or not. (QSHRMEMCTL)</p>
<p><span class="uicontrol">Allow use of shared or mapped memory with write capability</span>,
also known as <span class="uicontrol">QSHRMEMCTL</span>, is a member of the security
category of i5/OS™ system
values. You can use this system value to specify whether shared or mapped
memory with write capability can be used or not. To learn more, keep reading.</p>
<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>
</tr>
</thead>
<tbody><tr><th valign="top" class="firstcol" id="d0e35" headers="d0e31 ">Location</th>
<td valign="top" headers="d0e35 d0e31 ">In iSeries™ Navigator,
select your system, <span class="menucascade"><span class="uicontrol"></span> &gt; <span class="uicontrol">Configuration
and Service</span> &gt; <span class="uicontrol">System Values</span> &gt; <span class="uicontrol">Security</span> &gt; <span class="uicontrol">Shared Memory</span></span></td>
</tr>
<tr><th valign="top" class="firstcol" id="d0e53" headers="d0e31 ">Special authority</th>
<td valign="top" headers="d0e53 d0e31 ">All object (*ALLOBJ) and security administrator (*SECADM)</td>
</tr>
<tr><th valign="top" class="firstcol" id="d0e58" headers="d0e31 ">Default value</th>
<td valign="top" headers="d0e58 d0e31 ">Selected - shared or mapped memory with write capability is allowed</td>
</tr>
<tr><th valign="top" class="firstcol" id="d0e63" headers="d0e31 ">Changes take effect</th>
<td valign="top" headers="d0e63 d0e31 ">Immediately</td>
</tr>
<tr><th valign="top" class="firstcol" id="d0e68" headers="d0e31 ">Lockable</th>
<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>
</tr>
</tbody>
</table>
</div>
<div class="section"><h4 class="sectiontitle">What can I do with this system value?</h4><p>You may specify
whether users are allowed (1) or are not allowed (0) to use shared memory
or mapped memory stream files. You may select whether or not to allow access
to shared memory, or use mapped memory stream files. By allowing this option,
users can use shared-memory APIs (for example, shmat() - Shared Memory Attach
API), and can use mapped memory objects that have stream files (for example,
mmap() - Memory Map a File API). Allowing access to shared memory and mapped
memory stream files is recommended for environments where pointers may be
shared among programs, which may be running in different jobs. However, this
setting is not recommended for environments with higher security requirements.</p>
</div>
<div class="section"><h4 class="sectiontitle">Where can I get more information about this system value?</h4><p>To
learn more, go to the security system values overview topic. If you are looking
for a specific system value or category of system values, try using the i5/OS system
value finder.</p>
</div>
</div>
<div><div class="relconcepts"><strong>Related concepts</strong><br />
<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>
<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>
</div>
<div class="relinfo"><strong>Related information</strong><br />
<div><a href="rzakzfinder.htm">System value finder</a></div>
</div>
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