158 lines
5.0 KiB
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158 lines
5.0 KiB
HTML
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<title><sys/shm.h></title>
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<basefont size="3"> <a name="<sys/shm.h>"></a> <a name="tag_13_60"></a><!-- <sys/shm.h> -->
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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_13_60_01"></a>NAME</h4>
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<blockquote>sys/shm.h - XSI shared memory facility</blockquote>
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<h4><a name="tag_13_60_02"></a>SYNOPSIS</h4>
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<blockquote class="synopsis">
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<div class="box"><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 <sys/shm.h> <img src="../../images/opt-end.gif" alt="[Option End]" border=
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"0"></tt></div>
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</blockquote>
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<h4><a name="tag_13_60_03"></a>DESCRIPTION</h4>
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<blockquote>
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<p>The <i><sys/shm.h></i> header shall define the following symbolic constants:</p>
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<dl compact>
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<dt>SHM_RDONLY</dt>
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<dd>Attach read-only (else read-write).</dd>
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<dt>SHM_RND</dt>
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<dd>Round attach address to SHMLBA.</dd>
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</dl>
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<p>The <i><sys/shm.h></i> header shall define the following symbolic value:</p>
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<dl compact>
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<dt>SHMLBA</dt>
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<dd>Segment low boundary address multiple.</dd>
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</dl>
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<p>The following data types shall be defined through <b>typedef</b>:</p>
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<dl compact>
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<dt><b>shmatt_t</b></dt>
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<dd>Unsigned integer used for the number of current attaches that must be able to store values at least as large as a type
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<b>unsigned short</b>.</dd>
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</dl>
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<p>The <b>shmid_ds</b> structure shall contain the following members:</p>
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<pre>
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<tt>struct ipc_perm shm_perm </tt> Operation permission structure. <tt>
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size_t shm_segsz </tt> Size of segment in bytes. <tt>
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pid_t shm_lpid </tt> Process ID of last shared memory operation. <tt>
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pid_t shm_cpid </tt> Process ID of creator. <tt>
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shmatt_t shm_nattch</tt> Number of current attaches. <tt>
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time_t shm_atime </tt> Time of last <i>shmat</i>
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(). <tt>
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time_t shm_dtime </tt> Time of last <i>shmdt</i>
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(). <tt>
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time_t shm_ctime </tt> Time of last change by <i>shmctl</i>
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(). <tt>
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</tt>
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</pre>
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<p>The <b>pid_t</b>, <b>time_t</b>, <b>key_t</b>, and <b>size_t</b> types shall be defined as described in <a href=
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"../sys/types.h.html#tag_13_67"><i><sys/types.h></i></a> .</p>
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<p>The following shall be declared as functions and may also be defined as macros. Function prototypes shall be provided.</p>
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<pre>
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<tt>void *shmat(int, const void *, int);
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int shmctl(int, int, struct shmid_ds *);
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int shmdt(const void *);
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int shmget(key_t, size_t, int);
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</tt>
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</pre>
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<p>In addition, all of the symbols from <a href="../../basedefs/sys/ipc.h.html"><i><sys/ipc.h></i></a> shall be defined when
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this header is included.</p>
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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_13_60_04"></a>APPLICATION USAGE</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_13_60_05"></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_13_60_06"></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_13_60_07"></a>SEE ALSO</h4>
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<blockquote>
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<p><a href="../sys/ipc.h.html#tag_13_54"><i><sys/ipc.h></i></a> , <a href=
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"../sys/types.h.html#tag_13_67"><i><sys/types.h></i></a> , the System Interfaces volume of IEEE Std 1003.1-2001, <a
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href="../../functions/shmat.html"><i>shmat</i>()</a>, <a href="../../functions/shmctl.html"><i>shmctl</i>()</a>, <a href=
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"../../functions/shmdt.html"><i>shmdt</i>()</a>, <a href="../../functions/shmget.html"><i>shmget</i>()</a></p>
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</blockquote>
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<h4><a name="tag_13_60_08"></a>CHANGE HISTORY</h4>
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<blockquote>
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<p>First released in Issue 2. Derived from System V Release 2.0.</p>
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</blockquote>
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<h4><a name="tag_13_60_09"></a>Issue 5</h4>
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<blockquote>
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<p>The type of <i>shm_segsz</i> is changed from <b>int</b> to <b>size_t</b>.</p>
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</blockquote>
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<div class="box"><em>End of informative text.</em></div>
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UNIX ® is a registered Trademark of The Open Group.<br>
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POSIX ® is a registered Trademark of The IEEE.<br>
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