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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><html><head><!-- Copyright 1997 The Open Group, All Rights Reserved --><title><sys/ipc.h></title></head><body bgcolor=white><center><font size=2>The Single UNIX ® Specification, Version 2<br>Copyright © 1997 The Open Group</font></center><hr size=2 noshade><h4><a name = "tag_000_009_303"> </a>NAME</h4><blockquote>sys/ipc.h - interprocess communication access structure</blockquote><h4><a name = "tag_000_009_304"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <sys/ipc.h></code></pre></blockquote><h4><a name = "tag_000_009_305"> </a>DESCRIPTION</h4><blockquote>The<i><sys/ipc.h></i>header is used by three mechanisms for 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 perform an IPCoperation.<p>The structure<b>ipc_perm</b>contains the following members:<pre><code>uid_t uid owner's user IDgid_t gid owner's group IDuid_t cuid creator's user IDgid_t cgid creator's group IDmode_t mode read/write permission</code></pre><p>The<b>uid_t</b>,<b>gid_t</b>,<b>mode_t</b>and<b>key_t</b>types are defined as described in<i><a href="systypes.h.html"><sys/types.h></a></i>.<p>Definitions are given for the following constants:<p>Mode bits:<dl compact><dt>IPC_CREAT<dd>Create entry if key does not exist.<dt>IPC_EXCL<dd>Fail if key exists.<dt>IPC_NOWAIT<dd>Error if request must wait.</dl><p>Keys:<dl compact><dt>IPC_PRIVATE<dd>Private key.</dl><p>Control commands:<dl compact><dt>IPC_RMID<dd>Remove identifier.<dt>IPC_SET<dd>Set options.<dt>IPC_STAT<dd>Get options.</dl><p>The following is declared as a function and may also be defined as a macro.Function prototypes must be provided for use with an ISO Ccompiler.<pre><code>key_t <a href="ftok.html">ftok</a>(const char *, int);</code></pre></blockquote><h4><a name = "tag_000_009_306"> </a>APPLICATION USAGE</h4><blockquote>None.</blockquote><h4><a name = "tag_000_009_307"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_009_308"> </a>SEE ALSO</h4><blockquote><i><a href="ftok.html">ftok()</a></i>,<i><a href="systypes.h.html"><sys/types.h></a></i>.</blockquote><hr size=2 noshade><center><font size=2>UNIX ® is a registered Trademark of The Open Group.<br>Copyright © 1997 The Open Group<br> [ <a href="../index.html">Main Index</a> | <a href="../xshix.html">XSH</a> | <a href="../xcuix.html">XCU</a> | <a href="../xbdix.html">XBD</a> | <a href="../cursesix.html">XCURSES</a> | <a href="../xnsix.html">XNS</a> ]</font></center><hr size=2 noshade></body></html>⌨️ 快捷键说明
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