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<!-- Copyright (C) 2003 Red Hat, Inc.                                --><!-- This material may be distributed only subject to the terms      --><!-- and conditions set forth in the Open Publication License, v1.0  --><!-- or later (the latest version is presently available at          --><!-- http://www.opencontent.org/openpub/).                           --><!-- Distribution of the work or derivative of the work in any       --><!-- standard (paper) book form is prohibited unless prior           --><!-- permission is obtained from the copyright holder.               --><HTML><HEAD><TITLE>Message Passing [POSIX Section 15]</TITLE><meta name="MSSmartTagsPreventParsing" content="TRUE"><METANAME="GENERATOR"CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+"><LINKREL="HOME"TITLE="eCos Reference Manual"HREF="ecos-ref.html"><LINKREL="UP"TITLE="POSIX Standard Support"HREF="posix-standard-support.html"><LINKREL="PREVIOUS"TITLE="Clocks and Timers [POSIX Section 14]"HREF="posix-clocks-and-timers.html"><LINKREL="NEXT"TITLE="Thread Management [POSIX Section 16]"HREF="posix-thread-management.html"></HEAD><BODYCLASS="SECT1"BGCOLOR="#FFFFFF"TEXT="#000000"LINK="#0000FF"VLINK="#840084"ALINK="#0000FF"><DIVCLASS="NAVHEADER"><TABLESUMMARY="Header navigation table"WIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><THCOLSPAN="3"ALIGN="center">eCos Reference Manual</TH></TR><TR><TDWIDTH="10%"ALIGN="left"VALIGN="bottom"><AHREF="posix-clocks-and-timers.html"ACCESSKEY="P">Prev</A></TD><TDWIDTH="80%"ALIGN="center"VALIGN="bottom">Chapter 31. POSIX Standard Support</TD><TDWIDTH="10%"ALIGN="right"VALIGN="bottom"><AHREF="posix-thread-management.html"ACCESSKEY="N">Next</A></TD></TR></TABLE><HRALIGN="LEFT"WIDTH="100%"></DIV><DIVCLASS="SECT1"><H1CLASS="SECT1"><ANAME="POSIX-MESSAGE-PASSING">Message Passing &#0091;POSIX Section 15&#0093;</H1><DIVCLASS="SECT2"><H2CLASS="SECT2"><ANAME="AEN13246">Functions Implemented</H2><TABLEBORDER="5"BGCOLOR="#E0E0F0"WIDTH="70%"><TR><TD><PRECLASS="SCREEN">mqd&#0095;t mq&#0095;open( const char &#0042;name, int  oflag, ... ); int mq&#0095;close( mqd&#0095;t  mqdes ); int mq&#0095;unlink( const char &#0042;name );int mq&#0095;send( mqd&#0095;t mqdes, const char &#0042;msg&#0095;ptr,	     size&#0095;t msg&#0095;len, unsigned int msg&#0095;prio ); ssize&#0095;t mq&#0095;receive( mqd&#0095;t mqdes, char &#0042;msg&#0095;ptr,	            size&#0095;t msg&#0095;len, unsigned int &#0042;msg&#0095;prio );int mq&#0095;setattr( mqd&#0095;t mqdes, const struct mq&#0095;attr &#0042;mqstat,	        struct mq&#0095;attr &#0042;omqstat ); int mq&#0095;getattr( mqd&#0095;t mqdes, struct mq&#0095;attr &#0042;mqstat ); int mq&#0095;notify( mqd&#0095;t mqdes, const struct sigevent &#0042;notification );</PRE></TD></TR></TABLE><P>From POSIX 1003.1d draft: </P><TABLEBORDER="5"BGCOLOR="#E0E0F0"WIDTH="70%"><TR><TD><PRECLASS="SCREEN">int mq&#0095;send( mqd&#0095;t mqdes, const char &#0042;msg&#0095;ptr,	     size&#0095;t msg&#0095;len, unsigned int msg&#0095;prio,             const struct timespec *abs_timeout ); ssize&#0095;t mq&#0095;receive( mqd&#0095;t mqdes, char &#0042;msg&#0095;ptr,	            size&#0095;t msg&#0095;len, unsigned int &#0042;msg&#0095;prio,             const struct timespec *abs_timeout );</PRE></TD></TR></TABLE></DIV><DIVCLASS="SECT2"><H2CLASS="SECT2"><ANAME="AEN13251">Functions Omitted</H2><P>&lt;none&gt;</P></DIV><DIVCLASS="SECT2"><H2CLASS="SECT2"><ANAME="AEN13254">Notes</H2><P></P><UL><LI><P>    The presence of message queues is controlled by the    CYGPKG&#0095;POSIX&#0095;MQUEUES option.  Setting this will    cause &#0091;&#0095;POSIX&#0095;MESSAGE&#0095;PASSING&#0093; to    be defined and the message queue API to be made available.    </P></LI><LI><P>    Message queues are not currently filesystem objects. They live in    their own name and descriptor spaces.    </P></LI></UL></DIV></DIV><DIVCLASS="NAVFOOTER"><HRALIGN="LEFT"WIDTH="100%"><TABLESUMMARY="Footer navigation table"WIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top"><AHREF="posix-clocks-and-timers.html"ACCESSKEY="P">Prev</A></TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="ecos-ref.html"ACCESSKEY="H">Home</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top"><AHREF="posix-thread-management.html"ACCESSKEY="N">Next</A></TD></TR><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top">Clocks and Timers &#0091;POSIX Section 14&#0093;</TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="posix-standard-support.html"ACCESSKEY="U">Up</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top">Thread Management &#0091;POSIX Section 16&#0093;</TD></TR></TABLE></DIV></BODY></HTML>
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