l3.libnazgul/src/nzg_spaceCreate.c

#include "libnazgul.h"
#include "nzg_ids.h"

/* prototypes des fonctions annexes à ne pas exporter */
int msgSpaceIdIntern(msgSpaceId dest,const msgSpaceId src );
int msgPoolDataIdIntern(msgSpaceId dest,const msgSpaceId src );
int msgPoolDataTabSemIdIntern(
	msgPoolSemId destSemId,const msgSpaceId externId);
/*
 * spaceId : identifiant externe de l'espace de msg
 * queueNb : nombre de files de messages
 * poolNb : nombre de pool de buffers
 * queueNbCar : tableau de caracteristiques des different pool
 */

msgSpace * msgSpaceCreate(
	msgSpaceId externId, 
	int queueNb, 
	int poolNb, 
	msgPool * poolInfos ){
  msgSpaceId nzgId;
  /* msgSpaceList mSList;  */
  int mSFd; // shm file descriptor
  int mSPoolDataFd; // shm file descriptor
  int i;
  static int mSIdNum=-1;
  msgSpace * mSAddr;

  msgPoolDataTabId poolDataTabId;
  msgPoolData * mSPoolDataAddr; 
  msgBufferInfoTabId bufferInfoTabId;
  msgPoolId poolId;
  sem_t * mSDataTabSemFd;

  mSIdNum++;
  mSAddr=NULL;
  /** recuperation de la liste des msgSpace **/
  /* (creation si elle n'existe pas */

  /** on créee le nouvel element **/
  printf("PAGESIZE : %d\n",(int)PAGESIZE);
  if (msgSpaceIdIntern(nzgId,externId) < 0){
	return NULL;
  }
  fprintf(stderr,"Creating msgSpace with id : %s\n",nzgId);
  mSFd=shm_open(
	  nzgId,
	  O_RDWR|O_CREAT|O_EXCL|O_TRUNC,
	  MSGSPACE_DEFAULT_MODE
	  );
  if (mSFd == -1 ) {
	NZG_ERROR("shm_open : msgSpace creation",nzgId);
	return NULL;
  }

  /* on redimentionne l'element */
  if (ftruncate(mSFd, sizeof(* mSAddr)) == -1){
	fprintf( stderr, "msgSpace resizing failed: %s\n",
		strerror( errno ) );
	return NULL;
  }

  /* Map the memory object */
  mSAddr = mmap( 0, sizeof( *mSAddr ),
	  PROT_READ | PROT_WRITE,
	  MAP_SHARED, mSFd, 0 );
  if( mSAddr == MAP_FAILED ) {
	fprintf( stderr, "mmap failed: %s\n",
		strerror( errno ) );
	return NULL;
  }

  printf( "CREAT: msgSpace mapped to 0x%08x in %d\n", (int)mSAddr,(int)getpid());

  /* on ferme le descripteur du fichier */
  close(mSFd);

  /* on remplit la structure */
  strncpy(mSAddr->id,externId,MSGSPACE_ID_LEN);
  mSAddr->poolNb=poolNb;
  mSAddr->queueNb=queueNb;
  mSAddr->pid=getpid();
  msgPoolDataTabSemIdIntern(mSAddr->poolDataTabSemId,externId);
  /*  creation du poolData */
  msgPoolDataIdIntern(poolDataTabId,externId);
  strcpy(mSAddr->poolDataTabId,poolDataTabId);

  mSDataTabSemFd=sem_open(mSAddr->poolDataTabSemId,
	  O_CREAT|O_EXCL,SEM_DEFAULT_MODE,1);
  if (mSDataTabSemFd == SEM_FAILED){ 
	NZG_ERROR("sem_open : creation de la ressource",
		mSAddr->poolDataTabSemId);
	return NULL; 
  } else {
	NZG_ERROR("sem_open : creation oki",
		mSAddr->poolDataTabSemId);
  }
 sem_wait(mSDataTabSemFd);

  mSPoolDataFd=shm_open(
	  poolDataTabId,
	  O_RDWR|O_CREAT|O_EXCL|O_TRUNC,
	  MSGSPACE_DEFAULT_MODE
	  );
  if (mSPoolDataFd == -1 ) {
	fprintf( stderr, "poolData %s creation failed: %s\n",
		(char*)poolDataTabId,
		strerror( errno ) );
	return NULL;
  }

  /* allocation de la bonne zone mémoire pour le poolData */
  if (ftruncate(mSPoolDataFd, poolNb*sizeof(msgPoolData)) == -1){
	fprintf( stderr, "msgSpace resizing failed: %s\n",
		strerror( errno ) );
	return NULL;
  }

  /* TODO: attacher chacun des msgPoolData :
   * - y écrire les informations passées en param
   * - creer les zones mémoires de chacune des pool
   */   
  mSPoolDataAddr = mmap( 0, sizeof( *mSAddr ),
	  PROT_READ | PROT_WRITE,
	  MAP_SHARED, mSFd, 0 );
  if( mSPoolDataAddr == MAP_FAILED ) {
	fprintf( stderr, "mmap failed: %s\n",
		strerror( errno ) );
	return NULL;
  }
  close(mSPoolDataFd);
  printf( "msgPoolData map addr is 0x%08x\n", (int)mSPoolDataAddr );

  for (i=0;i<poolNb;i++){
	// creation d'une pool
	mSPoolDataAddr[i].bufferNb=poolInfos[i].bufferNb;
	mSPoolDataAddr[i].bufferSize=poolInfos[i].bufferSize;
	mSPoolDataAddr[i].allocDispBuffer=0;

	if (msgBufferInfoTabIdIntern(bufferInfoTabId,externId,i) == -1){
	  fprintf( stderr, "msgBufferInfoTabId creation failed for id %s\n",
		  (char*)poolId );
	  return NULL;
	}	
	strcpy(mSPoolDataAddr[i].bufferInfoTabId,bufferInfoTabId);
	printf("buffIfoTab %d name : %s\n",i,mSPoolDataAddr[i].bufferInfoTabId);
	msgBufferInfoTabCreate(externId,mSPoolDataAddr,i,poolInfos[i].bufferNb);

	if (msgPoolIdIntern(poolId,externId,i) == -1){
	  fprintf( stderr, "msgPoolId creation failed for id %s\n",
		  (char*)poolId );
	  return NULL;
	}
	strcpy(mSPoolDataAddr[i].poolId,poolId);
	msgPoolCreate(externId,i,poolInfos[i].bufferNb,poolInfos[i].bufferSize);

  }

  /* TODO: on ajoute spaceId a la liste des msgSpace connus */
  /* TODO: on crée queueNb files de messages */
  /* on renvoie un pointeur sur le bon spaceId */
 sem_post(mSDataTabSemFd);
  return mSAddr;
}