diff --git a/src/nzg_global.h b/src/nzg_global.h
index e89e4e5..34a84fa 100644
--- a/src/nzg_global.h
+++ b/src/nzg_global.h
@@ -8,6 +8,7 @@
 #include <fcntl.h> /* pour O_RDWR */
 #include <sys/types.h>
 #include <sys/mman.h> /* shm_open */
+#include <errno.h>
 
 #define PAGESIZE sysconf(_SC_PAGESIZE)
 #endif
diff --git a/src/nzg_spaces.c b/src/nzg_spaces.c
index 55012b2..c3734c6 100644
--- a/src/nzg_spaces.c
+++ b/src/nzg_spaces.c
@@ -1,6 +1,5 @@
 #include "libnazgul.h"
-#include <sys/types.h>
-#include <sys/mman.h> 
+ 
 
 /*
  * spaceId : identifiant externe de l'espace de msg
@@ -14,30 +13,49 @@ msgSpace * msgSpaceCreate(
 	int queueNb, 
 	int poolNb, 
 	msgPool * queueNbCar ){
-  msgSpace * result;
-  int shmId;
   msgSpaceId nzgId;
   msgSpaceList mSList; 
+  int mSFd; // shm file descriptor
   static int mSIdNum=-1;
+  msgSpace * mSAddr;
 
   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);
   nzgId=msgSp2nzgId(spaceId);
-  shmId=shm_open(
+  mSFd=shm_open(
 	  nzgId,
-	  O_RDWR|O_CREAT|O_EXCL,
+	  O_RDWR|O_CREAT|O_EXCL|O_TRUNC,
 	  MSGSPACE_DEFAULT_MODE
 	  );
-  if (shmId < 0 ) {
-	perror("shm_open");
+  if (mSFd == -1 ) {
+	fprintf( stderr, "msgSpace creation failed: %s\n",
+		strerror( errno ) );
 	return NULL;
   }
 
+  //on redimentionne l'element
+  if (ftruncate(mSFd, sizeof(PAGESIZE)) == -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( "Map addr is 0x%08x\n", mSAddr );
   /* on ajoute spaceId a la liste des msgSpace connus */
 
   /* on crée queueNb files de messages */
@@ -47,8 +65,7 @@ msgSpace * msgSpaceCreate(
   /* on attache tout ce beau monde au spaceId */
 
   /* on renvoie un pointeur sur le bon spaceId */
-  result=NULL;
-  return result;
+  return mSAddr;
 }