/**
* @file MsgQCheck.cpp
* Description: Source file for MsgQLib's MsgQCheck API
* Copyright (c) 2007 Nokia Corporation.
* All rights reserved.
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice, this list
* of conditions and the following disclaimer.Redistributions in binary form must
* reproduce the above copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided with the distribution.
* Neither the name of the Nokia Corporation nor the names of its contributors may be used
* to endorse or promote products derived from this software without specific prior written
* permission.
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
* SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <errno.h>
#include <sys/msg.h>
#include <msgqinternal.h>
#include <msgliterals.h>
/*****************************************************************************
* MsgQCheck
* Function: Function for checking how many messages are in a queue
*******************************************************************************/
EXPORT_C int MsgQCheck(ULONG qName, int* err) {
int nMsgs;
struct msqid_ds qStatus ;
int qId;
if((qId = msgget((key_t) qName ,IPC_CREAT | 0666 /*| IPC_EXCL */)) >=0 ) {
// get total count of msgs from the msg queue
if ((msgctl(qId,IPC_STAT ,&qStatus)) >= 0 ) {
nMsgs=qStatus.msg_qnum ;
*err = OK;
return(nMsgs);
}
else
*err=errno;
}
else
*err = KMsgQLibQIdErr;
return(ERROR);
}