l3.libnazgul/src/bufferMap.c

#include "libnazgul.h"

void *msgBufferMap(msgPoolData * poolDataTab, int poolIndex, int bufferIndex)
{
	void *resultAddr;
	int bufferSize, bufferNb;
	int poolBufferTabFd;
	msgPoolId poolBufferTabId;
	printf("Mapping buffer (%d,%d)\n", poolIndex, bufferIndex);
	// TODO: r<>cuperer l'ID du BufferInfoTab;
	strcpy(poolBufferTabId, poolDataTab[poolIndex].poolId);
	bufferSize = poolDataTab[poolIndex].bufferSize;
	bufferNb = poolDataTab[poolIndex].bufferNb;
	if (bufferNb < 0) {
		// do something with bufferNb
	}

	poolBufferTabFd = shm_open(poolBufferTabId, O_RDWR, SHM_DEFAULT_MODE);
	if (poolBufferTabFd < 0) {
		NZG_ERROR("shm_open", poolBufferTabId);
		goto ERROR;
	}
	// mapper le buffer dans l'espace m<>moire du processus
	/* on s'arrete juste derriere l'index qui nous int<6E>resse */
	resultAddr = mmap(NULL, bufferSize * (bufferIndex + 1), PROT_READ | PROT_WRITE,	//PROT_NONE
			  MAP_SHARED, poolBufferTabFd, (off_t) 0);
	if (resultAddr == MAP_FAILED) {
		NZG_ERROR("mmap", poolBufferTabId);
		goto ERROR;
	}
	printf("Mapped from %p to %p\n",
	       (void *)resultAddr,
	       (void *)(resultAddr + bufferSize * (bufferIndex + 1))
	    );

	resultAddr = resultAddr + (bufferSize * bufferIndex);
	printf("Moved to %p\n", (void *)resultAddr);

	/* mprotect(
	   resultAddr,
	   bufferSize,
	   PROT_READ|PROT_WRITE
	   ); */

	close(poolBufferTabFd);

	return resultAddr;
 ERROR:
	return NULL;
}