Symbian3/Examples/guid-6013a680-57f9-415b-8851-c4fa63356636/msgqcheck_8c_source.html
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
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<h1>examples/PIPS/opencmessagequeuelibraryex/engine/src/msgqcheck.c</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001
<a name="l00010"></a>00010 <span class="preprocessor">#include <errno.h></span>
<a name="l00011"></a>00011 <span class="preprocessor">#include <sys/msg.h></span>
<a name="l00012"></a>00012 <span class="preprocessor">#include "<a class="code" href="msgqinternal_8h.html">MsgQInternal.h</a>"</span>
<a name="l00013"></a>00013
<a name="l00014"></a>00014
<a name="l00015"></a>00015
<a name="l00016"></a>00016 <span class="comment">/*****************************************************************************</span>
<a name="l00017"></a>00017 <span class="comment">* MsgQCheck</span>
<a name="l00018"></a>00018 <span class="comment">* Function: Function for checking how many messages are in a queue</span>
<a name="l00019"></a>00019 <span class="comment">*******************************************************************************/</span>
<a name="l00020"></a>00020
<a name="l00021"></a><a class="code" href="msgqlib_8h.html#a6539cca974e31b9571caae1a93576b21">00021</a> EXPORT_C <span class="keywordtype">int</span> <a class="code" href="msgqlib_8h.html#a6539cca974e31b9571caae1a93576b21">MsgQCheck</a>(ULONG qName, <span class="keywordtype">int</span>* err) {
<a name="l00022"></a>00022 <a class="code" href="struct_msg_q_info.html">MSGQ_INFO</a>* pMsgQInfo = NULL;
<a name="l00023"></a>00023 <span class="keywordtype">int</span> nMsgs;
<a name="l00024"></a>00024 <span class="keyword">struct </span>msqid_ds qStatus ;
<a name="l00025"></a>00025
<a name="l00026"></a>00026 <span class="keywordflow">if</span> ((pMsgQInfo = MsgQTableLookup(qName)) != NULL) {
<a name="l00027"></a>00027 <span class="comment">// get total count of msgs from the msg queue </span>
<a name="l00028"></a>00028 <span class="keywordflow">if</span> ((msgctl(pMsgQInfo->qId,IPC_STAT ,&qStatus)) >= 0 ) {
<a name="l00029"></a>00029 nMsgs=qStatus.msg_qnum ;
<a name="l00030"></a>00030 <span class="keywordflow">if</span> (nMsgs == pMsgQInfo->numMsgs) {
<a name="l00031"></a>00031 *err = OK;
<a name="l00032"></a>00032 <span class="keywordflow">return</span>(nMsgs);
<a name="l00033"></a>00033 }
<a name="l00034"></a>00034 <span class="keywordflow">else</span> {
<a name="l00035"></a>00035 *err = KMsgQLibQShortErr;
<a name="l00036"></a>00036 <span class="keywordflow">return</span>(pMsgQInfo->numMsgs);
<a name="l00037"></a>00037 }
<a name="l00038"></a>00038 }
<a name="l00039"></a>00039 <span class="keywordflow">else</span>
<a name="l00040"></a>00040 *err=errno;
<a name="l00041"></a>00041 }
<a name="l00042"></a>00042 <span class="keywordflow">else</span>
<a name="l00043"></a>00043 *err = KMsgQLibQIdErr;
<a name="l00044"></a>00044 <span class="keywordflow">return</span>(ERROR);
<a name="l00045"></a>00045 }
<a name="l00046"></a>00046
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