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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/shm.h></title></head><body bgcolor="white"><script type="text/javascript" language="JavaScript" src="../../jscript/dotcode.js"></script><basefont size="3"> <a name="<sys/shm.h>"></a> <a name="tag_13_60"></a><!-- <sys/shm.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_60_01"></a>NAME</h4><blockquote>sys/shm.h - XSI shared memory facility</blockquote><h4><a name="tag_13_60_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/shm.h> <img src="../../images/opt-end.gif" alt="[Option End]" border="0"></tt></div></blockquote><h4><a name="tag_13_60_03"></a>DESCRIPTION</h4><blockquote><p>The <i><sys/shm.h></i> header shall define the following symbolic constants:</p><dl compact><dt>SHM_RDONLY</dt><dd>Attach read-only (else read-write).</dd><dt>SHM_RND</dt><dd>Round attach address to SHMLBA.</dd></dl><p>The <i><sys/shm.h></i> header shall define the following symbolic value:</p><dl compact><dt>SHMLBA</dt><dd>Segment low boundary address multiple.</dd></dl><p>The following data types shall be defined through <b>typedef</b>:</p><dl compact><dt><b>shmatt_t</b></dt><dd>Unsigned integer used for the number of current attaches that must be able to store values at least as large as a type<b>unsigned short</b>.</dd></dl><p>The <b>shmid_ds</b> structure shall contain the following members:</p><pre><tt>struct ipc_perm shm_perm </tt> Operation permission structure. <tt>size_t shm_segsz </tt> Size of segment in bytes. <tt>pid_t shm_lpid </tt> Process ID of last shared memory operation. <tt>pid_t shm_cpid </tt> Process ID of creator. <tt>shmatt_t shm_nattch</tt> Number of current attaches. <tt>time_t shm_atime </tt> Time of last <i>shmat</i> (). <tt>time_t shm_dtime </tt> Time of last <i>shmdt</i> (). <tt>time_t shm_ctime </tt> Time of last change by <i>shmctl</i> (). <tt></tt></pre><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="../sys/types.h.html#tag_13_67"><i><sys/types.h></i></a> .</p><p>The following shall be declared as functions and may also be defined as macros. Function prototypes shall be provided.</p><pre><tt>void *shmat(int, const void *, int);int shmctl(int, int, struct shmid_ds *);int shmdt(const void *);int shmget(key_t, size_t, int);</tt></pre><p>In addition, all of the symbols from <a href="../../basedefs/sys/ipc.h.html"><i><sys/ipc.h></i></a> shall be defined whenthis header is included.</p></blockquote><hr><div class="box"><em>The following sections are informative.</em></div><h4><a name="tag_13_60_04"></a>APPLICATION USAGE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_13_60_05"></a>RATIONALE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_13_60_06"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_13_60_07"></a>SEE ALSO</h4><blockquote><p><a href="../sys/ipc.h.html#tag_13_54"><i><sys/ipc.h></i></a> , <a href="../sys/types.h.html#tag_13_67"><i><sys/types.h></i></a> , the System Interfaces volume of IEEE Std 1003.1-2001, <ahref="../../functions/shmat.html"><i>shmat</i>()</a>, <a href="../../functions/shmctl.html"><i>shmctl</i>()</a>, <a href="../../functions/shmdt.html"><i>shmdt</i>()</a>, <a href="../../functions/shmget.html"><i>shmget</i>()</a></p></blockquote><h4><a name="tag_13_60_08"></a>CHANGE HISTORY</h4><blockquote><p>First released in Issue 2. Derived from System V Release 2.0.</p></blockquote><h4><a name="tag_13_60_09"></a>Issue 5</h4><blockquote><p>The type of <i>shm_segsz</i> is changed from <b>int</b> to <b>size_t</b>.</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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