Symbian3/Examples/guid-6013a680-57f9-415b-8851-c4fa63356636/msgqcreate_8c_source.html
author Dominic Pinkman <dominic.pinkman@nokia.com>
Fri, 13 Aug 2010 16:47:46 +0100
changeset 14 578be2adaf3e
parent 6 43e37759235e
permissions -rw-r--r--
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
6
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
     1
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
     2
<html xmlns="http://www.w3.org/1999/xhtml">
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
     3
<head>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
     4
<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
     5
<title>TB9.2 Example Applications: examples/PIPS/opencmessagequeuelibraryex/engine/src/msgqcreate.c Source File</title>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
     6
<link href="tabs.css" rel="stylesheet" type="text/css"/>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
     7
<link href="doxygen.css" rel="stylesheet" type="text/css"/>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
     8
</head>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
     9
<body>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    10
<!-- Generated by Doxygen 1.6.2 -->
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    11
<h1>examples/PIPS/opencmessagequeuelibraryex/engine/src/msgqcreate.c</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    12
<a name="l00010"></a>00010 <span class="preprocessor">#include &lt;errno.h&gt;</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    13
<a name="l00011"></a>00011 <span class="preprocessor">#include &lt;sys/msg.h&gt;</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    14
<a name="l00012"></a>00012 <span class="preprocessor">#include &lt;sys/sem.h&gt;</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    15
<a name="l00013"></a>00013 <span class="preprocessor">#include &quot;<a class="code" href="msgqinternal_8h.html">MsgQInternal.h</a>&quot;</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    16
<a name="l00014"></a>00014 
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    17
<a name="l00015"></a>00015 
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    18
<a name="l00016"></a>00016 <span class="comment">/********************************************************************************</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    19
<a name="l00017"></a>00017 <span class="comment">* MsgQCreate</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    20
<a name="l00018"></a>00018 <span class="comment">* Description: Creates a message queue</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    21
<a name="l00019"></a>00019 <span class="comment">* Inputs:</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    22
<a name="l00020"></a>00020 <span class="comment">*  qName   : ULONG that represents the queue name</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    23
<a name="l00021"></a>00021 <span class="comment">*  maxMsgs : ULONG that represents maximum size of messages </span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    24
<a name="l00022"></a>00022 <span class="comment">*********************************************************************************/</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    25
<a name="l00023"></a><a class="code" href="msgqlib_8h.html#acc58bf2bd8d3b904069d8d604ccea5b1">00023</a> EXPORT_C <span class="keywordtype">int</span> <a class="code" href="msgqlib_8h.html#acc58bf2bd8d3b904069d8d604ccea5b1">MsgQCreate</a>(ULONG qName, ULONG maxMsgs, ULONG qOptions, <span class="keywordtype">int</span>* err) {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    26
<a name="l00024"></a>00024         <span class="keywordtype">int</span>         qId;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    27
<a name="l00025"></a>00025         <span class="keywordtype">int</span>         semId;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    28
<a name="l00026"></a>00026         <span class="keywordtype">int</span>         semName ;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    29
<a name="l00027"></a>00027         <span class="keyword">struct </span>msqid_ds  qStatus ;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    30
<a name="l00028"></a>00028         <span class="keyword">struct </span>semid_ds  sStatus ;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    31
<a name="l00029"></a>00029         
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    32
<a name="l00030"></a>00030         <span class="keyword">union </span>semun {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    33
<a name="l00031"></a>00031                 <span class="keywordtype">int</span>              val;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    34
<a name="l00032"></a>00032                 <span class="keyword">struct </span>semid_ds* buf;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    35
<a name="l00033"></a>00033                 ushort_t*                array;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    36
<a name="l00034"></a>00034         } arg ;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    37
<a name="l00035"></a>00035 
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    38
<a name="l00036"></a>00036 
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    39
<a name="l00037"></a>00037         <span class="keywordtype">int</span>          hashInstErr;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    40
<a name="l00038"></a>00038 
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    41
<a name="l00039"></a>00039         <span class="keywordflow">if</span> (MsgQTableLookup(qName) != NULL) {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    42
<a name="l00040"></a>00040                 *err = OK;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    43
<a name="l00041"></a>00041                 <span class="keywordflow">return</span> (OK);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    44
<a name="l00042"></a>00042         }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    45
<a name="l00043"></a>00043         <span class="keywordflow">else</span> {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    46
<a name="l00044"></a>00044                 <span class="keywordflow">if</span>((qOptions == MSG_Q_FIFO) || (qOptions == MSG_Q_PRIORITY)) {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    47
<a name="l00045"></a>00045                         <span class="comment">// Set msg queue options to  FIFO and create the message queue</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    48
<a name="l00046"></a>00046                         qOptions= MSG_Q_FIFO ;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    49
<a name="l00047"></a>00047                         <span class="keywordflow">if</span>((qId = msgget((key_t) qName ,IPC_CREAT | 0666 | IPC_EXCL )) &gt;=0 ) {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    50
<a name="l00048"></a>00048                                 <span class="comment">//  set msg queue parameter max # bytes in queue</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    51
<a name="l00049"></a>00049                                 <span class="keywordflow">if</span>(  msgctl(qId,IPC_STAT,&amp;qStatus) == 0  )          
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    52
<a name="l00050"></a>00050                                 <span class="keywordflow">if</span>( qStatus.msg_qbytes &gt; (maxMsgs * MAX_MSG_LEN) ) {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    53
<a name="l00051"></a>00051                                         qStatus.msg_qbytes = maxMsgs * MAX_MSG_LEN ;              
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    54
<a name="l00052"></a>00052                                         <span class="keywordflow">if</span>( msgctl(qId,IPC_SET,&amp;qStatus) &lt; 0) {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    55
<a name="l00053"></a>00053                                                 <span class="comment">// delete message queue on error </span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    56
<a name="l00054"></a>00054                                                 msgctl(qId,IPC_RMID,0);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    57
<a name="l00055"></a>00055                                                 *err = errno;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    58
<a name="l00056"></a>00056                                                 <span class="keywordflow">return</span>(ERROR);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    59
<a name="l00057"></a>00057                                         }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    60
<a name="l00058"></a>00058                                 }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    61
<a name="l00059"></a>00059                                 <span class="comment">// create semaphore</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    62
<a name="l00060"></a>00060                                 semName= (key_t) qName;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    63
<a name="l00061"></a>00061                                 <span class="keywordflow">if</span>((semId = semget(semName, 1, IPC_CREAT | 0666 |IPC_EXCL )) &gt;= 0 ) {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    64
<a name="l00062"></a>00062                                         <span class="comment">// set the semaphore value</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    65
<a name="l00063"></a>00063                                         arg.buf = &amp;sStatus;              
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    66
<a name="l00064"></a>00064                                         arg.val = 1;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    67
<a name="l00065"></a>00065                                         semctl(semId , 0, SETVAL, arg) ;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    68
<a name="l00066"></a>00066                                         
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    69
<a name="l00067"></a>00067                                         <span class="comment">//install queue data in hash table</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    70
<a name="l00068"></a>00068                                         <span class="keywordflow">if</span>(InstallMsqQTable(qName, qId, semId, &amp;hashInstErr) == OK) {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    71
<a name="l00069"></a>00069                                                 AddToMsgQTable(qName);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    72
<a name="l00070"></a>00070                                                 *err = OK;                
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    73
<a name="l00071"></a>00071                                                 <span class="keywordflow">return</span> (OK);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    74
<a name="l00072"></a>00072                                         }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    75
<a name="l00073"></a>00073                                         <span class="keywordflow">else</span> {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    76
<a name="l00074"></a>00074                                                 <span class="comment">//delete semaphore on error</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    77
<a name="l00075"></a>00075                                                 semctl(semId,0,IPC_RMID,0) ;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    78
<a name="l00076"></a>00076                                                 *err = hashInstErr;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    79
<a name="l00077"></a>00077                                         }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    80
<a name="l00078"></a>00078                                 }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    81
<a name="l00079"></a>00079                                 <span class="keywordflow">else</span> {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    82
<a name="l00080"></a>00080                                         <span class="comment">// delete message queue on error</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    83
<a name="l00081"></a>00081                                         msgctl(qId,IPC_RMID,0);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    84
<a name="l00082"></a>00082                                         *err = errno;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    85
<a name="l00083"></a>00083                                 }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    86
<a name="l00084"></a>00084                         }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    87
<a name="l00085"></a>00085                         <span class="keywordflow">else</span> {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    88
<a name="l00086"></a>00086                                 *err = errno;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    89
<a name="l00087"></a>00087                         }       
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    90
<a name="l00088"></a>00088                 }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    91
<a name="l00089"></a>00089                 <span class="keywordflow">else</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    92
<a name="l00090"></a>00090                         *err = KMsgQLibParamErr;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    93
<a name="l00091"></a>00091 
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    94
<a name="l00092"></a>00092                 <span class="keywordflow">return</span>(ERROR);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    95
<a name="l00093"></a>00093         }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    96
<a name="l00094"></a>00094 }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    97
<a name="l00095"></a>00095 
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    98
</pre></div></div>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
    99
<hr size="1"/><address style="text-align: right;"><small>Generated by&nbsp;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
   100
<a href="http://www.doxygen.org/index.html">
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
   101
<img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.6.2 </small></address>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
   102
</body>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset
   103
</html>