155 lines
4.2 KiB
HTML
155 lines
4.2 KiB
HTML
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<title><sys/ipc.h></title>
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<basefont size="3"> <a name="<sys/ipc.h>"></a> <a name="tag_13_54"></a><!-- <sys/ipc.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_54_01"></a>NAME</h4>
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<blockquote>sys/ipc.h - XSI interprocess communication access structure</blockquote>
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<h4><a name="tag_13_54_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/ipc.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_54_03"></a>DESCRIPTION</h4>
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<blockquote>
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<p>The <i><sys/ipc.h></i> header is used by three mechanisms for XSI interprocess communication (IPC): messages, semaphores,
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and shared memory. All use a common structure type, <b>ipc_perm</b>, to pass information used in determining permission to perform
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an IPC operation.</p>
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<p>The <b>ipc_perm</b> structure shall contain the following members:</p>
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<pre>
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<tt>uid_t uid </tt> Owner's user ID. <tt>
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gid_t gid </tt> Owner's group ID. <tt>
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uid_t cuid </tt> Creator's user ID. <tt>
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gid_t cgid </tt> Creator's group ID. <tt>
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mode_t mode </tt> Read/write permission. <tt>
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</tt>
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</pre>
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<p>The <b>uid_t</b>, <b>gid_t</b>, <b>mode_t</b>, and <b>key_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>Definitions shall be provided for the following constants:</p>
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<p>Mode bits:</p>
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<dl compact>
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<dt>IPC_CREAT</dt>
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<dd>Create entry if key does not exist.</dd>
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<dt>IPC_EXCL</dt>
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<dd>Fail if key exists.</dd>
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<dt>IPC_NOWAIT</dt>
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<dd>Error if request must wait.</dd>
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</dl>
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<p>Keys:</p>
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<dl compact>
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<dt>IPC_PRIVATE</dt>
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<dd>Private key.</dd>
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</dl>
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<p>Control commands:</p>
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<dl compact>
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<dt>IPC_RMID</dt>
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<dd>Remove identifier.</dd>
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<dt>IPC_SET</dt>
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<dd>Set options.</dd>
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<dt>IPC_STAT</dt>
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<dd>Get options.</dd>
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</dl>
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<p>The following shall be declared as a function and may also be defined as a macro. A function prototype shall be provided.</p>
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<pre>
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<tt>key_t ftok(const char *, int);
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</tt>
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</pre>
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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_54_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_54_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_54_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_54_07"></a>SEE ALSO</h4>
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<blockquote>
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<p><a href="../sys/types.h.html#tag_13_67"><i><sys/types.h></i></a> , the System Interfaces volume of
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IEEE Std 1003.1-2001, <a href="../../functions/ftok.html"><i>ftok</i>()</a></p>
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</blockquote>
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<h4><a name="tag_13_54_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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<div class="box"><em>End of informative text.</em></div>
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POSIX ® is a registered Trademark of The IEEE.<br>
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