Client
Server
ftok(): is use to generate a unique key.
shmget(): int shmget(key_t,size_tsize,intshmflg); upon successful completion, shmget() returns an identifier for the shared memory segment.
shmat(): Before you can use a shared memory segment, you have to attach yourself to it using shmat(). void *shmat(int shmid ,void *shmaddr ,int shmflg); shmid is shared memory id. shmaddr specifies specific address to use but we should set it to zero and OS will automatically choose the address.
shmdt(): When you’re done with the shared memory segment, your program should detach itself from it using shmdt(). int shmdt(void *shmaddr);
shmctl(): when you detach from shared memory,it is not destroyed. So, to destroy shmctl() is used. shmctl(int shmid,IPC_RMID,NULL);
