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;
}