/** 

 *  @file MsgQRecv.cpp

 *  Description: Source file for MsgQLib's MsgQReceive 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 <sys/sem.h>

#include <unistd.h>

#include <string.h>

#include <msgqinternal.h>

/*******************************************************************************

* MsgQReceive (qName, msg, maxNBytes, timeout, err)

* Description: Function for receiving a message with internal copy

********************************************************************************/

EXPORT_C int MsgQReceive(ULONG qName, char* msg, ULONG maxNBytes, int timeout, int* err) {

	ssize_t rxBytes;

	int toTicks;

	int         qId;

	struct {

		long  mtype;

		char mtext[MAX_MSG_LEN];

	} message;

	/* check parameters */

	if((qId = msgget((key_t) qName ,IPC_CREAT | 0666 /*| IPC_EXCL */ )) >=0 ) {

	        toTicks = timeout;      

		message.mtype = 1;

		/* receive message */

		if((rxBytes = msgrcv(qId, &message, (size_t)maxNBytes, 1, toTicks)) != -1) {

			message.mtext[rxBytes-4] = '\0';

			bcopy(message.mtext, msg, rxBytes);

			*err = OK;

			return ((ULONG)rxBytes);

		}

		else {

			*err = errno;

		}

	}

	else {

		*err = KMsgQLibQIdErr;

	}

	return(ERROR);

}