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<html><head><title>IPC::Msg (Perl in a Nutshell, 2nd Edition)</title><link rel="stylesheet" type="text/css" href="../style/style1.css" /><meta name="DC.Creator" content="Stephen Spainhour" /><meta name="DC.Format" content="text/xml" scheme="MIME" /><meta name="DC.Language" content="en-US" /><meta name="DC.Publisher" content="O'Reilly & Associates, Inc." /><meta name="DC.Source" scheme="ISBN" content="0596002416L" /><meta name="DC.Subject.Keyword" content="stuff" /><meta name="DC.Title" content="Perl in a Nutshell, 2nd Edition" /><meta name="DC.Type" content="Text.Monograph" /></head><body bgcolor="#ffffff"><img src="gifs/smbanner.gif" usemap="#banner-map" border="0" alt="Book Home" /><map name="banner-map"><area shape="rect" coords="1,-2,616,66" href="index.htm" alt="Java and XSLT" /><area shape="rect" coords="629,-11,726,25" href="jobjects/fsearch.htm" alt="Search this book" /></map><div class="navbar"><table width="684" border="0"><tr><td align="left" valign="top" width="228"><a href="ch08_132.htm"><img src="../gifs/txtpreva.gif" alt="Previous" border="0" /></a></td><td align="center" valign="top" width="228" /><td align="right" valign="top" width="228"><a href="ch08_134.htm"><img src="../gifs/txtnexta.gif" alt="Next" border="0" /></a></td></tr></table></div><h2 class="sect1">8.133. IPC::Msg</h2><p><a name="INDEX-1484" /><a name="INDEX-1485" />System V Msg IPC object class. Usesconstants defined in IPC::SysV.</p><div class="refentry"><table width="515" border="0" cellpadding="5"><tr><td align="left"><font size="+1"><b>new</b></font></td><td align="right"><i></i></td></tr></table><hr width="515" size="3" noshade="true" align="left" color="black" /><pre>$<em class="replaceable">msg</em> = new IPC::Msg(<em class="replaceable">key</em>, <em class="replaceable">flags</em>)</pre><p>Creates a new message queue associated with<em class="replaceable"><tt>key</tt></em> and uses<em class="replaceable"><tt>flags</tt></em> to set the permissions. Creates thenew message queue if the following are true:</p><ul><li><p><em class="replaceable"><tt>key</tt></em> is equal to IPC_PRIVATE.</p></li><li><p><em class="replaceable"><tt>key</tt></em> doesn't already havean associated message queue, and <tt class="literal">FLAGS &IPC_CREAT</tt> is true.</p></li></ul></div><div class="refentry"><table width="515" border="0" cellpadding="5"><tr><td align="left"><font size="+1"><b>id</b></font></td><td align="right"><i></i></td></tr></table><hr width="515" size="3" noshade="true" align="left" color="black" /><pre>$<em class="replaceable">msg</em>->id</pre><p>Returns the system identifier for the message queue.</p></div><div class="refentry"><table width="515" border="0" cellpadding="5"><tr><td align="left"><font size="+1"><b>rcv</b></font></td><td align="right"><i></i></td></tr></table><hr width="515" size="3" noshade="true" align="left" color="black" /><pre>$<em class="replaceable">msg</em>->rcv(<em class="replaceable">buf</em>, <em class="replaceable">len</em>[, <em class="replaceable">type</em>[, <em class="replaceable">flags</em>]])</pre><p>Reads a message from the queue, returning the type of the message.</p></div><div class="refentry"><table width="515" border="0" cellpadding="5"><tr><td align="left"><font size="+1"><b>remove</b></font></td><td align="right"><i></i></td></tr></table><hr width="515" size="3" noshade="true" align="left" color="black" /><pre>$<em class="replaceable">msg</em>->remove</pre><p>Removes and destroys the message queue.</p></div><div class="refentry"><table width="515" border="0" cellpadding="5"><tr><td align="left"><font size="+1"><b>set</b></font></td><td align="right"><i></i></td></tr></table><hr width="515" size="3" noshade="true" align="left" color="black" /><table width="515" border="0" cellpadding="5"><tr><td align="left"><pre>$<em class="replaceable">msg</em>->set(<em class="replaceable">stat</em>)$<em class="replaceable">msg</em>->set(name=>value[,name=>value...])</pre></td><td align="right" /></tr></table><p><p>Accepts either a stat object as returned by the<tt class="literal">stat</tt> method or a list of name/value pairs and setsthe following values of the stat structure associated with themessage queue:</p><blockquote><pre class="code">uidgidmode (the permission bits)qbytes</pre></blockquote></div><div class="refentry"><table width="515" border="0" cellpadding="5"><tr><td align="left"><font size="+1"><b>snd</b></font></td><td align="right"><i></i></td></tr></table><hr width="515" size="3" noshade="true" align="left" color="black" /><pre>$<em class="replaceable">msg</em>->snd(<em class="replaceable">type</em>, <em class="replaceable">msg</em>[, <em class="replaceable">flags</em>])</pre><p>Puts a message of type <em class="replaceable">type</em> on the queuewith the data from <em class="replaceable"><tt>msg</tt></em>. See the<tt class="literal">msgsnd</tt> function.</p></div><div class="refentry"><table width="515" border="0" cellpadding="5"><tr><td align="left"><font size="+1"><b>stat</b></font></td><td align="right"><i></i></td></tr></table><hr width="515" size="3" noshade="true" align="left" color="black" /><pre>$<em class="replaceable">ds</em> = $<em class="replaceable">msg</em>->stat</pre><p>Returns an object of type IPC::Msg::stat (which is a subclass ofClass::Struct) that provides the following fields:</p><blockquote><pre class="code">uid gid cuid cgidmode qnum qbytes lspidlrpid stime rtime ctime</pre></blockquote><p>See the <tt class="literal">stat</tt> function and your systemdocumentation for more information.</p></div><hr width="684" align="left" /><div class="navbar"><table width="684" border="0"><tr><td align="left" valign="top" width="228"><a href="ch08_132.htm"><img src="../gifs/txtpreva.gif" alt="Previous" border="0" /></a></td><td align="center" valign="top" width="228"><a href="index.htm"><img src="../gifs/txthome.gif" alt="Home" border="0" /></a></td><td align="right" valign="top" width="228"><a href="ch08_134.htm"><img src="../gifs/txtnexta.gif" alt="Next" border="0" /></a></td></tr><tr><td align="left" valign="top" width="228">8.132. IO::Socket</td><td align="center" valign="top" width="228"><a href="index/index.htm"><img src="../gifs/index.gif" alt="Book Index" border="0" /></a></td><td align="right" valign="top" width="228">8.134. IPC::Open2</td></tr></table></div><hr width="684" align="left" /><img src="../gifs/navbar.gif" usemap="#library-map" border="0" alt="Library Navigation Links" /><p><p><font size="-1"><a href="copyrght.htm">Copyright © 2002</a> O'Reilly & Associates. 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