143 lines
5.2 KiB
HTML
143 lines
5.2 KiB
HTML
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<title>shmdt</title>
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<basefont size="3"> <a name="shmdt"></a> <a name="tag_03_677"></a><!-- shmdt -->
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<!--header start-->
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<center><font size="2">The Open Group Base Specifications Issue 6<br>
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IEEE Std 1003.1-2001<br>
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Copyright © 2001 The IEEE and The Open Group, All Rights reserved.</font></center>
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<!--header end-->
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<hr size="2" noshade>
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<h4><a name="tag_03_677_01"></a>NAME</h4>
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<blockquote>shmdt - XSI shared memory detach operation</blockquote>
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<h4><a name="tag_03_677_02"></a>SYNOPSIS</h4>
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<blockquote class="synopsis">
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<div class="box"><code><tt><sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup> <img src="../images/opt-start.gif" alt=
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"[Option Start]" border="0"> #include <<a href="../basedefs/sys/shm.h.html">sys/shm.h</a>><br>
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<br>
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int shmdt(const void *</tt><i>shmaddr</i><tt>); <img src="../images/opt-end.gif" alt="[Option End]" border="0"></tt></code></div>
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<tt><br>
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</tt></blockquote>
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<h4><a name="tag_03_677_03"></a>DESCRIPTION</h4>
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<blockquote>
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<p>The <i>shmdt</i>() function operates on XSI shared memory (see the Base Definitions volume of IEEE Std 1003.1-2001, <a
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href="../basedefs/xbd_chap03.html#tag_03_340">Section 3.340, Shared Memory Object</a>). It is unspecified whether this function
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interoperates with the realtime interprocess communication facilities defined in <a href=
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"xsh_chap02_08.html#tag_02_08"><i>Realtime</i></a> .</p>
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<p>The <i>shmdt</i>() function detaches the shared memory segment located at the address specified by <i>shmaddr</i> from the
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address space of the calling process.</p>
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</blockquote>
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<h4><a name="tag_03_677_04"></a>RETURN VALUE</h4>
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<blockquote>
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<p>Upon successful completion, <i>shmdt</i>() shall decrement the value of <i>shm_nattch</i> in the data structure associated with
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the shared memory ID of the attached shared memory segment and return 0.</p>
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<p>Otherwise, the shared memory segment shall not be detached, <i>shmdt</i>() shall return -1, and <i>errno</i> shall be set to
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indicate the error.</p>
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</blockquote>
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<h4><a name="tag_03_677_05"></a>ERRORS</h4>
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<blockquote>
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<p>The <i>shmdt</i>() function shall fail if:</p>
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<dl compact>
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<dt>[EINVAL]</dt>
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<dd>The value of <i>shmaddr</i> is not the data segment start address of a shared memory segment.</dd>
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</dl>
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</blockquote>
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<hr>
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<div class="box"><em>The following sections are informative.</em></div>
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<h4><a name="tag_03_677_06"></a>EXAMPLES</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_677_07"></a>APPLICATION USAGE</h4>
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<blockquote>
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<p>The POSIX Realtime Extension defines alternative interfaces for interprocess communication. Application developers who need to
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use IPC should design their applications so that modules using the IPC routines described in <a href=
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"xsh_chap02_07.html#tag_02_07"><i>XSI Interprocess Communication</i></a> can be easily modified to use the alternative
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interfaces.</p>
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</blockquote>
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<h4><a name="tag_03_677_08"></a>RATIONALE</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_677_09"></a>FUTURE DIRECTIONS</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_677_10"></a>SEE ALSO</h4>
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<blockquote>
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<p><a href="xsh_chap02_07.html#tag_02_07"><i>XSI Interprocess Communication</i></a> , <a href=
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"xsh_chap02_08.html#tag_02_08"><i>Realtime</i></a> , <a href="exec.html"><i><a href="../functions/exec.html">exec</a></i>()</a> ,
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<a href="exit.html"><i>exit</i>()</a> , <a href="fork.html"><i>fork</i>()</a> , <a href="shmat.html"><i>shmat</i>()</a> , <a href=
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"shmctl.html"><i>shmctl</i>()</a> , <a href="shmget.html"><i>shmget</i>()</a> , <a href="shm_open.html"><i>shm_open</i>()</a> , <a
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href="shm_unlink.html"><i>shm_unlink</i>()</a> , the Base Definitions volume of IEEE Std 1003.1-2001, <a href=
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"../basedefs/sys/shm.h.html"><i><sys/shm.h></i></a></p>
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</blockquote>
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<h4><a name="tag_03_677_11"></a>CHANGE HISTORY</h4>
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<blockquote>
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<p>First released in Issue 2. Derived from Issue 2 of the SVID.</p>
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</blockquote>
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<h4><a name="tag_03_677_12"></a>Issue 5</h4>
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<blockquote>
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<p>Moved from SHARED MEMORY to BASE.</p>
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<p>The note about use of POSIX Realtime Extension IPC routines has been moved from FUTURE DIRECTIONS to a new APPLICATION USAGE
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section.</p>
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</blockquote>
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<div class="box"><em>End of informative text.</em></div>
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