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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta name="generator" content="HTML Tidy, see www.w3.org"><meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><link type="text/css" rel="stylesheet" href="style.css"><!-- Generated by The Open Group's rhtm tool v1.2.1 --><!-- Copyright (c) 2001-2003 The Open Group, All Rights Reserved --><title><sys/ipc.h></title></head><body bgcolor="white"><script type="text/javascript" language="JavaScript" src="../../jscript/dotcode.js"></script><basefont size="3"> <a name="<sys/ipc.h>"></a> <a name="tag_13_54"></a><!-- <sys/ipc.h> --> <!--header start--><center><font size="2">The Open Group Base Specifications Issue 6<br>IEEE Std 1003.1, 2003 Edition<br>Copyright © 2001-2003 The IEEE and The Open Group, All Rights reserved.</font></center><!--header end--><hr size="2" noshade><h4><a name="tag_13_54_01"></a>NAME</h4><blockquote>sys/ipc.h - XSI interprocess communication access structure</blockquote><h4><a name="tag_13_54_02"></a>SYNOPSIS</h4><blockquote class="synopsis"><div class="box"><tt><sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup> <img src="../../images/opt-start.gif" alt="[Option Start]" border="0"> #include <sys/ipc.h> <img src="../../images/opt-end.gif" alt="[Option End]" border="0"></tt></div></blockquote><h4><a name="tag_13_54_03"></a>DESCRIPTION</h4><blockquote><p>The <i><sys/ipc.h></i> header is used by three mechanisms for XSI interprocess communication (IPC): messages, semaphores,and shared memory. All use a common structure type, <b>ipc_perm</b>, to pass information used in determining permission to performan IPC operation.</p><p>The <b>ipc_perm</b> structure shall contain the following members:</p><pre><tt>uid_t uid </tt> Owner's user ID. <tt>gid_t gid </tt> Owner's group ID. <tt>uid_t cuid </tt> Creator's user ID. <tt>gid_t cgid </tt> Creator's group ID. <tt>mode_t mode </tt> Read/write permission. <tt></tt></pre><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="../sys/types.h.html#tag_13_67"><i><sys/types.h></i></a> .</p><p>Definitions shall be provided for the following constants:</p><p>Mode bits:</p><dl compact><dt>IPC_CREAT</dt><dd>Create entry if key does not exist.</dd><dt>IPC_EXCL</dt><dd>Fail if key exists.</dd><dt>IPC_NOWAIT</dt><dd>Error if request must wait.</dd></dl><p>Keys:</p><dl compact><dt>IPC_PRIVATE</dt><dd>Private key.</dd></dl><p>Control commands:</p><dl compact><dt>IPC_RMID</dt><dd>Remove identifier.</dd><dt>IPC_SET</dt><dd>Set options.</dd><dt>IPC_STAT</dt><dd>Get options.</dd></dl><p>The following shall be declared as a function and may also be defined as a macro. A function prototype shall be provided.</p><pre><tt>key_t ftok(const char *, int);</tt></pre></blockquote><hr><div class="box"><em>The following sections are informative.</em></div><h4><a name="tag_13_54_04"></a>APPLICATION USAGE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_13_54_05"></a>RATIONALE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_13_54_06"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_13_54_07"></a>SEE ALSO</h4><blockquote><p><a href="../sys/types.h.html#tag_13_67"><i><sys/types.h></i></a> , the System Interfaces volume ofIEEE Std 1003.1-2001, <a href="../../functions/ftok.html"><i>ftok</i>()</a></p></blockquote><h4><a name="tag_13_54_08"></a>CHANGE HISTORY</h4><blockquote><p>First released in Issue 2. Derived from System V Release 2.0.</p></blockquote><div class="box"><em>End of informative text.</em></div><hr><hr size="2" noshade><center><font size="2"><!--footer start-->UNIX ® is a registered Trademark of The Open Group.<br>POSIX ® is a registered Trademark of The IEEE.<br>[ <a href="../../mindex.html">Main Index</a> | <a href="../../basedefs/contents.html">XBD</a> | <a href="../../utilities/contents.html">XCU</a> | <a href="../../functions/contents.html">XSH</a> | <a href="../../xrat/contents.html">XRAT</a> ]</font></center><!--footer end--><hr size="2" noshade></body></html>⌨️ 快捷键说明
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