Symbian3/Examples/guid-6013a680-57f9-415b-8851-c4fa63356636/msgqrecv_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/msgqrecv.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 <sys/sem.h></span>
<a name="l00013"></a>00013 <span class="preprocessor">#include <unistd.h></span>
<a name="l00014"></a>00014 <span class="preprocessor">#include <string.h></span>
<a name="l00015"></a>00015 <span class="preprocessor">#include "<a class="code" href="msgqinternal_8h.html">MsgQInternal.h</a>"</span>
<a name="l00016"></a>00016
<a name="l00017"></a>00017
<a name="l00018"></a>00018
<a name="l00019"></a>00019 <span class="comment">/*******************************************************************************</span>
<a name="l00020"></a>00020 <span class="comment">* MsgQReceive (qName, msg, maxNBytes, timeout, err)</span>
<a name="l00021"></a>00021 <span class="comment">* Description: Function for receiving a message with internal copy</span>
<a name="l00022"></a>00022 <span class="comment">********************************************************************************/</span>
<a name="l00023"></a>00023
<a name="l00024"></a><a class="code" href="msgqlib_8h.html#a92645de66865355158589ff1dd7bc28d">00024</a> EXPORT_C <span class="keywordtype">int</span> <a class="code" href="msgqlib_8h.html#a92645de66865355158589ff1dd7bc28d">MsgQReceive</a>(ULONG qName, <span class="keywordtype">char</span>* msg, ULONG maxNBytes, <span class="keywordtype">int</span> timeout, <span class="keywordtype">int</span>* err) {
<a name="l00025"></a>00025 <a class="code" href="struct_msg_q_info.html">MSGQ_INFO</a>* pMsgQInfo = NULL;
<a name="l00026"></a>00026 ssize_t rxBytes;
<a name="l00027"></a>00027 <span class="keywordtype">int</span> toTicks;
<a name="l00028"></a>00028
<a name="l00029"></a>00029 <span class="keyword">struct </span>{
<a name="l00030"></a>00030 <span class="keywordtype">long</span> mtype;
<a name="l00031"></a>00031 <span class="keywordtype">char</span> mtext[MAX_MSG_LEN];
<a name="l00032"></a>00032 } message;
<a name="l00033"></a>00033
<a name="l00034"></a>00034 <span class="comment">/* check parameters */</span>
<a name="l00035"></a>00035 <span class="keywordflow">if</span> ((pMsgQInfo = MsgQTableLookup(qName)) != NULL) {
<a name="l00036"></a>00036 <span class="keywordflow">if</span>(timeout != NO_WAIT && timeout != WAIT_FOREVER)
<a name="l00037"></a>00037 toTicks = timeout < 10 ? 1: (ULONG)((timeout * sysconf(_SC_CLK_TCK)) / 1000);
<a name="l00038"></a>00038 <span class="keywordflow">else</span>
<a name="l00039"></a>00039 toTicks = timeout;
<a name="l00040"></a>00040
<a name="l00041"></a>00041 message.mtype = 1;
<a name="l00042"></a>00042 <span class="comment">/* receive message */</span>
<a name="l00043"></a>00043 <span class="keywordflow">if</span>((rxBytes = msgrcv(pMsgQInfo->qId, &message, (<span class="keywordtype">size_t</span>)maxNBytes, 1, toTicks)) != -1) {
<a name="l00044"></a>00044 message.mtext[rxBytes-4] = <span class="charliteral">'\0'</span>;
<a name="l00045"></a>00045 bcopy(message.mtext, msg, rxBytes);
<a name="l00046"></a>00046 pMsgQInfo->numMsgs--;
<a name="l00047"></a>00047 *err = OK;
<a name="l00048"></a>00048 <span class="keywordflow">return</span> ((ULONG)rxBytes);
<a name="l00049"></a>00049 }
<a name="l00050"></a>00050 <span class="keywordflow">else</span>
<a name="l00051"></a>00051 *err = errno;
<a name="l00052"></a>00052 }
<a name="l00053"></a>00053 <span class="keywordflow">else</span>
<a name="l00054"></a>00054 *err = KMsgQLibQIdErr;
<a name="l00055"></a>00055
<a name="l00056"></a>00056 <span class="keywordflow">return</span>(ERROR);
<a name="l00057"></a>00057 }
<a name="l00058"></a>00058
<a name="l00059"></a>00059
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