1 /** |
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2 * @file MsgQCheck.cpp |
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3 * Description: Source file for MsgQLib's MsgQCheck API |
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4 * Copyright (c) 2007 Nokia Corporation. |
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5 * All rights reserved. |
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6 * Redistribution and use in source and binary forms, with or without modification, |
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7 * are permitted provided that the following conditions are met: |
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8 * Redistributions of source code must retain the above copyright notice, this list |
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9 * of conditions and the following disclaimer.Redistributions in binary form must |
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10 * reproduce the above copyright notice, this list of conditions and the following |
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11 * disclaimer in the documentation and/or other materials provided with the distribution. |
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12 * Neither the name of the Nokia Corporation nor the names of its contributors may be used |
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13 * to endorse or promote products derived from this software without specific prior written |
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14 * permission. |
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15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY |
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16 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT |
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18 * SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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19 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT |
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20 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, |
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23 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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24 */ |
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25 |
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26 #include <errno.h> |
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27 #include <sys/msg.h> |
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28 #include <msgqinternal.h> |
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29 #include <msgliterals.h> |
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30 |
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31 |
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32 |
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33 /***************************************************************************** |
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34 * MsgQCheck |
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35 * Function: Function for checking how many messages are in a queue |
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36 *******************************************************************************/ |
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37 |
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38 EXPORT_C int MsgQCheck(ULONG qName, int* err) { |
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39 |
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40 int nMsgs; |
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41 struct msqid_ds qStatus ; |
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42 int qId; |
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43 |
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44 |
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45 if((qId = msgget((key_t) qName ,IPC_CREAT | 0666 /*| IPC_EXCL */)) >=0 ) { |
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46 // get total count of msgs from the msg queue |
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47 if ((msgctl(qId,IPC_STAT ,&qStatus)) >= 0 ) { |
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48 nMsgs=qStatus.msg_qnum ; |
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49 *err = OK; |
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50 return(nMsgs); |
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51 } |
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52 else |
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53 *err=errno; |
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54 } |
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55 else |
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56 *err = KMsgQLibQIdErr; |
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57 return(ERROR); |
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58 } |
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59 |
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