#include "libnazgul.h"
#include "ids.h"

void *msgQueueElemOpen(msgQueueElemId queueElemId)
{
	int queueElemFd;
	void *queueElemAddr;

	queueElemFd = shm_open(queueElemId, O_RDWR, SHM_DEFAULT_MODE);
	if (queueElemFd == -1) {
		NZG_ERROR("shm_open : msgQueue open", queueElemId);
		goto ERROR;
	}

	queueElemAddr = mmap(NULL,
			     sizeof(msgQueueElem),
			     PROT_READ | PROT_WRITE,
			     MAP_SHARED, queueElemFd, 0);
	if (queueElemAddr == MAP_FAILED) {
		NZG_ERROR("mmap", queueElemId);
		goto ERROR;
	}

	close(queueElemFd);
	return queueElemAddr;
 ERROR:
	return NULL;
}