/** 

 *  @file MsgQCreate.cpp

 *  Description: Source file for MsgQLib's MsgQCreate 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 <MsgQInternal.h>

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

* MsgQCreate

* Description: Creates a message queue

* Inputs:

*  qName   : ULONG that represents the queue name

*  maxMsgs : ULONG that represents maximum size of messages 

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

EXPORT_C int MsgQCreate(ULONG qName, ULONG maxMsgs, ULONG qOptions, int* err) {

	int         qId;

	//int         semId;

	//int         semName ;

	struct msqid_ds  qStatus ;

	//struct semid_ds  sStatus ;

	//union semun {

	//	int              val;

	//	struct semid_ds* buf;

	//	ushort_t*		 array;

	//} arg ;

	int          hashInstErr;

	//if (MsgQTableLookup(qName) != NULL) {

	//	*err = OK;

	//	return (OK);

	//}

	//else {

			if((qOptions == MSG_Q_FIFO) || (qOptions == MSG_Q_PRIORITY)) {

				// Set msg queue options to  FIFO and create the message queue

				qOptions= MSG_Q_FIFO ;

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

				//  set msg queue parameter max # bytes in queue

				if( msgctl(qId,IPC_STAT,&qStatus) == 0  ) 

				if( qStatus.msg_qbytes > (maxMsgs * MAX_MSG_LEN) ) {

					qStatus.msg_qbytes = maxMsgs * MAX_MSG_LEN ;              

					if( msgctl(qId,IPC_SET,&qStatus) < 0) {

						// delete message queue on error 

						msgctl(qId,IPC_RMID,0);

						*err = errno;

						return(ERROR);

					}

				}

				*err = OK;                

				return (OK);

				// create semaphore

				//semName= (key_t) qName;

				//if((semId = semget(semName, 1, IPC_CREAT | 0666 |IPC_EXCL )) >= 0 ) {

					// set the semaphore value

				//	arg.buf = &sStatus;              

				//	arg.val = 1;

				//	semctl(semId , 0, SETVAL, arg) ;

					//install queue data in hash table

				//	if(InstallMsqQTable(qName, qId, semId, &hashInstErr) == OK) {

				//		AddToMsgQTable(qName);

				//		*err = OK;                

				//		return (OK);

				//	}

				//	else {

						//delete semaphore on error

				//		semctl(semId,0,IPC_RMID,0) ;

				//		*err = hashInstErr;

				//	}

				//}

				//else {

					// delete message queue on error

				//	msgctl(qId,IPC_RMID,0);

				//	*err = errno;

				//}

			}

			else {

				*err = errno;

			}       

		}

		else

			*err = KMsgQLibParamErr;

		return(ERROR);

	//}

}