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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/msg.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_324"> </a>NAME</h4><blockquote>sys/msg.h - message queue structures</blockquote><h4><a name = "tag_000_009_325"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <sys/msg.h></code></pre></blockquote><h4><a name = "tag_000_009_326"> </a>DESCRIPTION</h4><blockquote>The <<b>sys/msg.h</b>> header defines the following constantand members of the structure<b>msqid_ds</b>.<p>The following data types are defined through<b>typedef</b>:<dl compact><dt><b>msgqnum_t</b><dd><index term="data type, msgqnum_t"></index>Used for the number of messages in the message queue.<dt><b>msglen_t</b><dd><index term="data type, msglen_t"></index>Used for the number of bytes allowed in a message queue.</dl><p>These types are unsigned integer types that are able to store values atleast as large as a type<b>unsigned short</b>.<p>Message operation flag:<dl compact><dt>MSG_NOERROR<dd>No error if big message.</dl><p>The structure<b>msqid_ds</b>contains the following members:<pre><code>struct ipc_perm msg_perm operation permission structuremsgqnum_t msg_qnum number of messages currently on queuemsglen_t msg_qbytes maximum number of bytes allowed on queuepid_t msg_lspid process ID of last <i>msgsnd</i>()pid_t msg_lrpid process ID of last <i>msgrcv</i>()time_t msg_stime time of last <i>msgsnd</i>()time_t msg_rtime time of last <i>msgrcv</i>()time_t msg_ctime time of last change</code></pre><p>The<b>pid_t</b>,<b>time_t</b>,<b>key_t</b>and<b>size_t</b>types are defined as described in<i><a href="systypes.h.html"><sys/types.h></a></i>.<p>The following are declared as functions and may also be definedas macros.Function prototypes must be provided for use with an ISO Ccompiler.<pre><code>int <a href="msgctl.html">msgctl</a>(int, int, struct msqid_ds *);int <a href="msgget.html">msgget</a>(key_t, int);ssize_t <a href="msgrcv.html">msgrcv</a>(int, void *, size_t, long int, int);int <a href="msgsnd.html">msgsnd</a>(int, const void *, size_t, int);</code></pre><p>In addition, all of the symbols from<i><a href="sysipc.h.html"><sys/ipc.h></a></i>will be defined when this header is included.</blockquote><h4><a name = "tag_000_009_327"> </a>APPLICATION USAGE</h4><blockquote>None.</blockquote><h4><a name = "tag_000_009_328"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_009_329"> </a>SEE ALSO</h4><blockquote><i><a href="msgctl.html">msgctl()</a></i>,<i><a href="msgget.html">msgget()</a></i>,<i><a href="msgrcv.html">msgrcv()</a></i>,<i><a href="msgsnd.html">msgsnd()</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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