| ftok | Create token from filename | 
| msgctl | Perform various operations on a message queue | 
| msgget | Return message queue ID, possibly creating the queue | 
| msgrcv | Retrieve a message from the queue | 
| msgsnd | Send a message to the message queue | 
| semctl | Perform various control operations on a semaphore set | 
| semget | Return the ID of a semaphore set, possibly creating the set | 
| semop | Perform semaphore operation. | 
| semtimedop | Perform semaphore operation using timeout. | 
| shmat | Attach a shared memory block. | 
| shmctl | Perform control operations on a shared memory block. | 
| shmdt | Detach shared memory block. | 
| shmget | Return the ID of a shared memory block, possibly creating it |