l3.libnazgul/src/nzg_pool.c

# include "libnazgul.h"

/* pid[]
		liste process demandeurs */

int msgPoolCreate(
		msgPoolId poolId,
		int buffNb,
		int buffSize
	) {
	
	int poolFd;
	static int poolNb;
	msgPoolId id;
	sem_t * sem;
	
	if (msgSpacePoolId2nzgPoolId(id,poolId,poolNb) == -1){
	  fprintf( stderr, "msgPoolId creation failed for id %s\n",
		(char*)poolId );
	  return -1;
	}
	
	poolFd=shm_open(id,O_RDWR|O_CREAT|O_EXCL|O_TRUNC,MSGSPACE_DEFAULT_MODE);
	if (poolFd == -1 ) {
	fprintf( stderr, "msgPool creation failed: %s\n",
		strerror( errno ) );
	return -1;
	}

	// on met un semaphore sur le pool
	sem = sem_open(id, O_CREAT|O_EXCL, 0666, buffNb);
	
	// on met le pool a la taille voulue pour qu'il
	// puisse contenir les buffs
	if (ftruncate(poolFd, (buffSize*buffNb)) == -1){
	fprintf( stderr, "msgPool resizing failed: %s\n",
		strerror( errno ) );
	return -1;
  }

	close(poolFd);

	return 0;
}