/** 
 *  @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);
	//}
}