diff --git a/src/SharedMemoryAccess.cpp b/src/SharedMemoryAccess.cpp
index e5e4543..9f13ff9 100644
--- a/src/SharedMemoryAccess.cpp
+++ b/src/SharedMemoryAccess.cpp
@@ -2,25 +2,27 @@
 // Created by Cigerxwin  Chaker on 05.11.19.
 //
 #include <iostream>
-#include <sys/_types.h>
+#include <sys/types.h>
 #include <sys/ipc.h>
 #include <sys/shm.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <sys/stat.h>
-//#include "sharedMemory.h"  /* header is important for the shmID. name could be different. maybe not needed cause: (shmget(memory_access_key, NULL, 0)) */
 #include <sys/sem.h>
 #include <unistd.h>
+#include <cstring>
+
+#include "SharedMemoryAccess.h"  /* header is important for the shmID. name could be different. maybe not needed cause: (shmget(memory_access_key, NULL, 0)) */
 
 int initSemaphore (void) {
     /* Testen, ob das Semaphor bereits existiert */
-    semId = semget (semKey, 0, IPC_PRIVATE);
+    semId = semget (SEM_KEY, 0, IPC_PRIVATE);
     if (semId < 0) {
         /* ... existiert noch nicht, also anlegen        */
         /* Alle Zugriffsrechte der Dateikreierungsmaske */
         /* erlauben                                     */
         umask(0);
-        semId = semget (semKey, 1, IPC_CREAT | IPC_EXCL | PERM);
+        semId = semget (SEM_KEY, 1, IPC_CREAT | IPC_EXCL | PERM);
         if (semId < 0) {
             return -1;
         }
@@ -48,9 +50,9 @@ void writeToShm(char* text, int size) {
         /* we could return -1, not sure if it will be useful to continue after there is no shm allocated for any reason*/
     } else {
         char *shm_pointer = (char *) shmat(shmId, NULL, 0);
-        semaphore_operation(LOCK);
+        semaphoreOperation(LOCK);
         memcpy(shm_pointer, text, size);
-        semaphore_operation(UNLOCK);
+        semaphoreOperation(UNLOCK);
     }
 }
 
diff --git a/src/SharedMemoryAccess.h b/src/SharedMemoryAccess.h
index 9f26857..d9e15bf 100644
--- a/src/SharedMemoryAccess.h
+++ b/src/SharedMemoryAccess.h
@@ -8,7 +8,7 @@
 #define PERM 0666      /* Zugriffsrechte */
 #define LOCK       -1
 #define UNLOCK      1
-#define SemKey  123458L
+#define SEM_KEY  123458L
 
 int memoryAccessKey; /* var type is int. but could be another type. */ //TODO: look after type in sharedmemory group
 int semId;
@@ -17,4 +17,5 @@ int initSemaphore (void);
 int semaphoreOperation (int op);
 char* getShmPointer(void);
 void writeToShm(char* text, int size);
+
 #endif //LIBRARY_SHAREDMEMORYACCESSS_H