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<!-- Copyright (C) 2003 Red Hat, Inc.                                -->
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NAME="POSIX-MESSAGE-PASSING">Message Passing &#0091;POSIX Section 15&#0093;</H1
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN13246">Functions Implemented</H2
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="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
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="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
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CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN13251">Functions Omitted</H2
><P
>&lt;none&gt;</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="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
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1	28	unneback	`<!-- Copyright (C) 2003 Red Hat, Inc. -->`
2			`<!-- This material may be distributed only subject to the terms -->`
3			`<!-- and conditions set forth in the Open Publication License, v1.0 -->`
4			`<!-- or later (the latest version is presently available at -->`
5			`<!-- http://www.opencontent.org/openpub/). -->`
6			`<!-- Distribution of the work or derivative of the work in any -->`
7			`<!-- standard (paper) book form is prohibited unless prior -->`
8			`<!-- permission is obtained from the copyright holder. -->`
9			`<HTML`
10			`><HEAD`
11			`><TITLE`
12			`>Message Passing [POSIX Section 15]</TITLE`
13			`><meta name="MSSmartTagsPreventParsing" content="TRUE">`
14			`<META`
15			`NAME="GENERATOR"`
16			`CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+`
17			`"><LINK`
18			`REL="HOME"`
19			`TITLE="eCos Reference Manual"`
20			`HREF="ecos-ref.html"><LINK`
21			`REL="UP"`
22			`TITLE="POSIX Standard Support"`
23			`HREF="posix-standard-support.html"><LINK`
24			`REL="PREVIOUS"`
25			`TITLE="Clocks and Timers [POSIX Section 14]"`
26			`HREF="posix-clocks-and-timers.html"><LINK`
27			`REL="NEXT"`
28			`TITLE="Thread Management [POSIX Section 16]"`
29			`HREF="posix-thread-management.html"></HEAD`
30			`><BODY`
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44			`CELLSPACING="0"`
45			`><TR`
46			`><TH`
47			`COLSPAN="3"`
48			`ALIGN="center"`
49			`>eCos Reference Manual</TH`
50			`></TR`
51			`><TR`
52			`><TD`
53			`WIDTH="10%"`
54			`ALIGN="left"`
55			`VALIGN="bottom"`
56			`><A`
57			`HREF="posix-clocks-and-timers.html"`
58			`ACCESSKEY="P"`
59			`>Prev</A`
60			`></TD`
61			`><TD`
62			`WIDTH="80%"`
63			`ALIGN="center"`
64			`VALIGN="bottom"`
65			`>Chapter 31. POSIX Standard Support</TD`
66			`><TD`
67			`WIDTH="10%"`
68			`ALIGN="right"`
69			`VALIGN="bottom"`
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71			`HREF="posix-thread-management.html"`
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75			`></TR`
76			`></TABLE`
77			`><HR`
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80			`><DIV`
81			`CLASS="SECT1"`
82			`><H1`
83			`CLASS="SECT1"`
84			`><A`
85			`NAME="POSIX-MESSAGE-PASSING">Message Passing [POSIX Section 15]</H1`
86			`><DIV`
87			`CLASS="SECT2"`
88			`><H2`
89			`CLASS="SECT2"`
90			`><A`
91			`NAME="AEN13246">Functions Implemented</H2`
92			`><TABLE`
93			`BORDER="5"`
94			`BGCOLOR="#E0E0F0"`
95			`WIDTH="70%"`
96			`><TR`
97			`><TD`
98			`><PRE`
99			`CLASS="SCREEN"`
100			`>mqd_t mq_open( const char *name, int oflag, ... );`
101			`int mq_close( mqd_t mqdes );`
102			`int mq_unlink( const char *name );`
103			`int mq_send( mqd_t mqdes, const char *msg_ptr,`
104			`size_t msg_len, unsigned int msg_prio );`
105			`ssize_t mq_receive( mqd_t mqdes, char *msg_ptr,`
106			`size_t msg_len, unsigned int *msg_prio );`
107			`int mq_setattr( mqd_t mqdes, const struct mq_attr *mqstat,`
108			`struct mq_attr *omqstat );`
109			`int mq_getattr( mqd_t mqdes, struct mq_attr *mqstat );`
110			`int mq_notify( mqd_t mqdes, const struct sigevent *notification );</PRE`
111			`></TD`
112			`></TR`
113			`></TABLE`
114			`><P`
115			`>From POSIX 1003.1d draft: </P`
116			`><TABLE`
117			`BORDER="5"`
118			`BGCOLOR="#E0E0F0"`
119			`WIDTH="70%"`
120			`><TR`
121			`><TD`
122			`><PRE`
123			`CLASS="SCREEN"`
124			`>int mq_send( mqd_t mqdes, const char *msg_ptr,`
125			`size_t msg_len, unsigned int msg_prio,`
126			`const struct timespec *abs_timeout );`
127			`ssize_t mq_receive( mqd_t mqdes, char *msg_ptr,`
128			`size_t msg_len, unsigned int *msg_prio,`
129			`const struct timespec *abs_timeout );</PRE`
130			`></TD`
131			`></TR`
132			`></TABLE`
133			`></DIV`
134			`><DIV`
135			`CLASS="SECT2"`
136			`><H2`
137			`CLASS="SECT2"`
138			`><A`
139			`NAME="AEN13251">Functions Omitted</H2`
140			`><P`
141			`><none></P`
142			`></DIV`
143			`><DIV`
144			`CLASS="SECT2"`
145			`><H2`
146			`CLASS="SECT2"`
147			`><A`
148			`NAME="AEN13254">Notes</H2`
149			`><P`
150			`></P`
151			`><UL`
152			`><LI`
153			`><P`
154			`> The presence of message queues is controlled by the`
155			`CYGPKG_POSIX_MQUEUES option. Setting this will`
156			`cause [_POSIX_MESSAGE_PASSING] to`
157			`be defined and the message queue API to be made available.`
158			`</P`
159			`></LI`
160			`><LI`
161			`><P`
162			`> Message queues are not currently filesystem objects. They live in`
163			`their own name and descriptor spaces.`
164			`</P`
165			`></LI`
166			`></UL`
167			`></DIV`
168			`></DIV`
169			`><DIV`
170			`CLASS="NAVFOOTER"`
171			`><HR`
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186			`ACCESSKEY="P"`
187			`>Prev</A`
188			`></TD`
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191			`ALIGN="center"`
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195			`ACCESSKEY="H"`
196			`>Home</A`
197			`></TD`
198			`><TD`
199			`WIDTH="33%"`
200			`ALIGN="right"`
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202			`><A`
203			`HREF="posix-thread-management.html"`
204			`ACCESSKEY="N"`
205			`>Next</A`
206			`></TD`
207			`></TR`
208			`><TR`
209			`><TD`
210			`WIDTH="33%"`
211			`ALIGN="left"`
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213			`>Clocks and Timers [POSIX Section 14]</TD`
214			`><TD`
215			`WIDTH="34%"`
216			`ALIGN="center"`
217			`VALIGN="top"`
218			`><A`
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220			`ACCESSKEY="U"`
221			`>Up</A`
222			`></TD`
223			`><TD`
224			`WIDTH="33%"`
225			`ALIGN="right"`
226			`VALIGN="top"`
227			`>Thread Management [POSIX Section 16]</TD`
228			`></TR`
229			`></TABLE`
230			`></DIV`
231			`></BODY`
232			`></HTML`
233			`>`

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